Bin Feng
Youbin He1*- 1School of Geosciences, Yangtze University, Wuhan, China
- 2China National Offshore Oil Corporation, Beijing, China
- 3Tianjin Branch of China National Offshore Oil Corporation, Tianjin, China
The paleogeographic reconstruction of ancient source-to-sink systems is a current focus and challenge in the field of Earth sciences; however, there are few established method or representative reconstruction case for ancient source-to-sink system paleogeographic reconstruction. Using drilling, thin-section, core, and 3D seismic data guided by sequence stratigraphy and sedimentology and the source-to-sink system approach, the source-to-sink system characteristics of the second member of the Paleogene Shahejie Formation in the Miaoxibei area of the Bohai Bay Basin were reconstructed. In addition, a new method for paleogeographic reconstruction of the ancient source-to-sink system was established using geomorphology and sediment backfilling technology to identify the erosion evolution history of the provenance area and to reconstruct the study area source-to-sink system for the investigated time-span. This study shows that a complete near-transport source-to-sink system developed in the Miaoxibei area, with the source area composed of Mesozoic granites, Neoproterozoic quartzites, and conglomerates. The primary and secondary watersheds were trending in N–S and E–W directions, respectively. The paleo drainage system trended in a N–S and E–W direction. The sedimentary facies represent mainly fan deltas and lakes. During the Paleogene, erosion was stronger in the western part of the source area than that in the eastern part, and the position of the paleo watershed gradually shifted eastward. The reconstruction method presented here and its results on the source-to-sink system can facilitate ancient source-to-sink system research in continental basins and serve as a model for paleogeographic reconstruction of ancient source-to-sink systems and related hydrocarbon exploration in other regions.
1 Introduction
The source-to-sink system is one of the four main research fields proposed in the U.S. “MARGINS Program Science Plans 2004” (Li et al., 2003; Allen, 2005; 2008; Gao, 2005; Syvitski and Miliman, 2007; Wang, 2009; Martinsen et al., 2010; Liu E. T. et al., 2020) and is currently widely used in sedimentary research (Amorosi et al., 2016; Anderson et al., 2016; Walsh et al., 2016; Shao et al., 2019; Tian et al., 2019). In recent years, the study of source-to-sink systems in sedimentary basins has achieved a series of considerable results in driving response mechanisms, quantitative relationship of elements, prediction of high-quality hydrocarbon source rocks and high-quality reservoirs, and reconstruction of ancient source-to-sink system. However, complex source rock types, tectonic evolution and paleogeomorphology, multi-directional sediment supply, and co-occurrence of various sedimentary systems make characterization more challenging (Xie and Li, 1993; Jiang, 2010; Weissmann et al., 2010; Fielding et al., 2012; Xu, 2013; Zhu et al., 2013; Lin et al., 2015; Liu H. et al., 2020; Liu et al., 2022). In addition, the reconstruction of ancient source-to-sink systems in lacustrine basins and continental basins is particularly challenging, given the limitations of the ancient geological record and the irreversibility of geological processes (Morehead, 1999; Romans et al., 2016; Shao et al., 2019). How to reconstruct an ancient “Source-to-Sink” System in a Lacustrine Basin? Remains a current priority and challenge in the field of Earth sciences.
The Miaoxibei area is located in the east of Bohai Bay Basin, one of the largest lacustrine basins in China. The Miaoxibei area is a well-developed Paleogene sequence with multiple sets of reservoir cap assemblages and successful hydrocarbon exploration (Wu et al., 2014; Figure 1A). However, to date, exploration of the Paleogene sequence has been relatively limited (Liu P. B et al., 2017; Zhu, 2020). Regarding the Miaoxibei area, the lack of sedimentary research is one of the main problems restricting hydrocarbon exploration (Sambrook Smith et al., 2010; Sømme et al., 2009; Sømme and Jackson, 2013; Liu Q. H et al., 2017). Therefore, it is necessary to describe the sedimentary system and reconstruct the paleogeographic source-to-sink system to guide the prediction of deeply buried layer sedimentary facies in the Miaoxibei area.
FIGURE 1. Miaoxibei area location and geology. (A) Bohai Bay Basin location and its sub-basins (from Tian et al., 2019; Du et al., 2020). The rectangle in (A) is the Miaoxibei range and its neighboring area. The inset map of China is based on the standard map available on the official website of the Ministry of Natural Resources of China: http//bzdt.ch.mnr.gov.cn. (B) The Miaoxibei tectonic unit subdivision and planar distribution and its neighboring area (from Liu Q. H. et al., 2017; Zhang et al., 2017). The rectangle in (B) delineates the study area, and the profile location is shown. (C) Tectonic characteristics of the Miaoxibei area.
To address these issues and based on the study of the source-to-sink system characteristics in the second member of the Paleogene Shahejie Formation in the Miaoxibei area, a method for reconstructing the paleogeographic source-to-sink systems is proposed. The paleogeographic source-to-sink system of the second member of the Paleogene Shahejie Formation during the sedimentary period is reconstructed. In this study, the distribution of deep-layer sedimentary systems could be predicted more accurately, and these findings have provided a sedimentary basis for hydrocarbon exploration. These findings also offer the potential to promote further research progress in continental basin source-to-sink systems and provide a scientific basis and case reference for studying source-to-sink systems in the Bohai Bay Basin and other areas with similar geological conditions.
2 Geological background
The Bohai Bay Basin, located in eastern China, is a lacustrine basin developed on top of the basement of the North China land mass, with an area of about 20 × 104 km2 (Liu P. B et al., 2017; Zhu, 2020). The basin is bounded by the Taihangshan Uplift in the west, the Jiao-liao Uplift in the east, the Yanshan Uplift in the north, and the Luxi Uplift in the south, and can be divided into six depression tectonic zones, including the Linqing Depression, the Jizhong Depression, the Bohaizhong Depression, and the Liaodongwan Depression (Figure 1A). The Cenozoic of the Bohai Bay Basin is characterized by the superposition of multiple tectonic gyres and the composite of multiple orogenic mechanisms, and is filled with Paleoproterozoic fault tectonic systems and Neoproterozoic depression tectonic systems (Liu Q. H et al., 2017; Zhu, 2020).
The Miaoxibei area is located on the eastern edge of the Bohai Bay Basin in a sloping zone (Figure 1A). It comprises the Miaoxibei Uplift and the Bodong Sag, with an area of 442 km2. The Miaoxibei Uplift is sandwiched between the Bodong and Miaoxi Sags and is controlled by the NE–SW trending half-anticline structure along the major fault (Miao No. 1 Fault) on the northeastern boundary (Figure 1B). The northwestern part of the Miaoxibei Uplift is deeper toward the northwest and gradually shallows to the southeast, exhibiting an asymmetric feature of west low and east high (Liu P. B et al., 2017; Zhang et al., 2017; Figure 1C).
Drilling data has shown that the Kongdian, Shahejie, and Dongying Formations of the Paleogene are developed in the Bodong Sag (Figure 2). The Shahejie Formation can be divided into four parts: the first, second, third, and fourth members of this formation. The target unit here is the second member of the Paleogene Shahejie Formation, which predominantly consists of a set of fan delta to lacustrine sediments. The main lithologies include conglomerate, sandstone, and mudstone, with a thickness of approximately 50–150 m (Li, 2015; Zhu, 2020).
FIGURE 2. Miaoxibei area lithostratigraphy and strata pictorial chart. Lithological data and interpretations are based on a combination of data from wells located in the study area and neighboring regions (Tectonic date are modified from Li, 2015).
The Paleogene tectonic evolution in the Miaoxibei area can be divided into rifting I stage of Kongdian Formation to the fourth Member of the Shahejie Formation, rifting II stage of the third Member of the Shahejie Formation, thermal subsidence stage of the first and second Member of the Shahejie Formation, and rifting III stage of the Dongying Formation (Li, 2015; Figure 2). The sedimentary time-span of the second member of this formation was generally a thermal subsidence regime after a taphrogeny (Li, 2015; Figure 2). Tectonic movement predominantly occurred in the thermal subsidence, and the tectonic activity was weak, with the early period tectonic characteristics being inherited (the third member of the Shahejie Formation and Kongdian Formation), which preserved the Paleogene early period tectonic characteristics (Li, 2015). During the Paleogene, the Miaoxibei area exhibited a tectonic pattern of alternating uplift and depression, and the detritus from the Jiaoliao Uplift outside the Bohai Bay Basin is blocked by the Miaoxi Sag and Miaoxibei Uplift, and was not transported to the Bodong Sag (Li, 2015; Zhu, 2020). The Shahejie Formation shows strong inheritance of early period tectonic and sedimentary features during its sedimentation (Li, 2015). The Miaoxibei Uplift and Bodong Sag form a complete source-to-sink system (Zhu, 2020), providing suitable conditions for conducting sedimentological studies using a source-to-sink system approach. Therefore, the second member of the Shahejie Formation was selected as the target stratum for this study.
3 Research data and methods
Drilling and 3D seismic data from the entire Bodong area were collected by the China National Offshore Oil Corporation (CNOOC). There were a total of nine drill holes in the study area, among which Wells A-1, B-1, B-2, and C-1 encountered the second member of the Shahejie Formation. The main frequency of the seismic data is 32 Hz with an effective frequency range of 0–68 Hz. Detailed data including the lithologies (nine wells), well logs, sidewall cores (23 samples), and thin sections (27 samples) were also available for analysis in this study.
Relatively detailed methods have been developed for the elements of the source-to-sink system in continental basins, including bedrock types, watersheds, paleo rivers, transport pathways, sedimentary facies distribution, and paleogeomorphological features (Yang J. C, 1985; Liu et al., 2016; Zhao et al., 2017; Li et al., 2021; Zhao et al., 2021). Therefore, this study examined source-to-sink system paleogeographical reconstruction methods. This reconstruction comprises two parts, that is, paleogeographical reconstruction in the source and sedimentary areas (Shao et al., 2019).
3.1 Source area paleogeographical reconstruction method
Regarding the source area paleogeographical reconstruction, classical geomorphology theory highlights two important source erosion processes, namely, a) the decrease in source altitude (Figure 3A) (Yang L.Z, 1985), and b) the migration of the watershed (Figure 3B; South China Agricultural University, 1980). Based on studies on erosion evolution models focusing on source area residual geomorphology and using the sediment backfilling method (Helland et al., 2016; Shao et al., 2019), the paleogeography of this area was reconstructed.
FIGURE 3. Erosion process schematic representation in the source area. (A) Reduction in source altitude. From time T1 to T3, the source altitude was reduced (modified from Yang L.Z, 1985). (B) Watershed migration from time T1 to time T4. The watershed migrated from west to east and from high to low (modified from South China Agricultural University, 1980).
3.2 Sedimentary area paleogeographical reconstruction method
The methods for sedimentary strata reconstruction paleogeomorphology mainly include geophysical (Bai et al., 2002), imprinting (Xia and Ma, 1999), compaction thickness restoration (Jiang et al., 2009), residual thickness (He et al., 2007), and stratigraphic trend methods (Li et al., 2007). Among them, the imprinting method considers the influence of pre-sedimentary structures and can quantitatively represent paleogeomorphology. However, it cannot effectively restore denudation (Xia and Ma, 1999), whereas the stratigraphic trend method can accurately do this (Li et al., 2007; Figure 4). Therefore, in the continental basin, using the imprinting method combined with the stratigraphic trend method is more accurate for reconstructing sedimentary strata paleogeographical characteristics.
FIGURE 4. Schematic diagram representing the stratigraphic trend method, which recovers the denudation amount by using non-denuded strata structural and internal morphological characteristics. On the unconformity, surfaces T5 and T4 of the denuded strata refer to the underlying strata and extend from the equal thickness rule; surface T3 refers to T4 and the decreasing trend of residual strata thickness; surfaces T2 and T1 are similar to T3 and refer to the below surface.
4 Source-to-sink system characteristics
4.1 Source characteristics
4.1.1 Source lithology
Drilling data suggest that the Miaoxibei Uplift bedrock consists of Mesozoic granite and Early Proterozoic quartz schist. Well D-4 predominantly consists of Early Proterozoic quartzite and conglomerate. The main lithology of Well D-2 is Mesozoic granite, with conglomerate at the top. The bottom of Well D-1 is Lower Proterozoic quartzite, gradually changing to include conglomerate, fine sandstone, and siltstone at the top. (Figure 5A).
FIGURE 5. Sections and images showing bedrock lithology and geophysical characteristics in the Miaoxibei Uplift. (A) Miaoxibei Uplift bedrock well section. (B) Well D-2 thin section at a depth of 1,350 m, under cross-polarized light, revealing adamellite with a granite and monzonitic structure. The main minerals are quartz, potassium feldspar, plagioclase, biotite, and amphibole. (C) Well D-3 thin section at a depth of 1,365 m, under cross-polarized light, revealing granodiorite with hypidiomorphic granular texture and a red plaque indicating local potassic alteration. The main minerals are quartz, feldspar, plagioclase, hornblende, and biotite. (D) Well D-4 cross-well seismic profile. (E) Well D-2 cross-well seismic profile. Thin section data are cited from the literature. The location of the well connection section and seismic sections are marked in Figure 6.
Thin sections of Wells D-3 and B-1 in the Miaoxibei Uplift showed that the Mesozoic granite is mainly granodiorite, with a small proportion of biotite granite. Thin section data from Well D-3 showed that its lithology was gray-white blocky granite (Figure 5B). The main mineral components were quartz, potassium feldspar, plagioclase, biotite, and hornblende. Thin section data from Well D-2 showed that its lithology is gray-white blocky granodiorite with a semi-self-shaped granular structure, with local potassium alteration shown as reddish patches (Figure 5C). The main mineral components were quartz, potassium feldspar, plagioclase, hornblende, and biotite (Zhao et al., 2017).
The seismic reflections of Mesozoic granite, Lower Proterozoic quartzite, and conglomerate are distinct. Lower Proterozoic quartzite and conglomerate showed weak-amplitude, low-frequency, intermittent worm-like reflective seismic phases (Figure 5D). The Mesozoic granite displayed medium–strong amplitude and medium–high frequency chaotic reflective seismic phases (Figure 5E). Based on this, the boundary and lithology distribution of the Miaoxibei Uplift were determined. Lower Proterozoic quartzite and conglomerate were distributed in the north and south sides of the Miaoxibei Uplift, and Mesozoic granite is distributed in the center (Figure 6).
FIGURE 6. Schematic layout showing the bedrock lithology distribution in the Miaoxibei Uplift. The lithology in the Miaoxibei Uplift middle part is Mesozoic granite, and the southern and northern areas are Lower Proterozoic quartz schist and breccia.
4.1.2 Watershed and drainage system
Under the action of differential denudation, a series of high points and channels are formed on the top surface of the Miaoxibei Uplift. According to the structural characteristics and trend of the Miaoxibei Uplift, the connection of the series of high points is the watershed, and the combination of a series of channels from high to low and from upstream to downstream is the drainage system (Liu Q.H et al., 2017; Zhu, 2020). Based on the watershed development scale, the Miaoxibei Uplift watershed can be divided into main and secondary watersheds (Figure 7A). The main watershed runs north–south along the long axis of the Miaoxibei Uplift, usually closer to the southeastern side. The secondary watersheds are scattered on the Miaoxibei Uplift along the short axis, intersecting perpendicularly or at acute angles to the main watershed. Due to the influence of the watersheds, the drainage systems in the southern and northern parts were small in scale but large in quantity, while those in the central part were large in scale but small in quantity.
FIGURE 7. Digital elevation model (DEM) and seismic profile images depicting the Miaoxibei Uplift geomorphic characteristics, paleo watershed, drainage system distribution, and transport pathway characteristics. (A) Watershed and drainage system distribution in the Miaoxibei Uplift. The base map is the top structure map of the Miaoxibei Uplift. (B) Transport pathway seismic characteristics. Red arrows mark the transport pathway development position, and the profile location is shown in (A).
4.2 Transport pathway characteristics
The sediment transport on the Miaoxibei Uplift followed valleys, which can divide into V-shaped, U-shaped, and compound valleys, as well as single fault type troughs (Figure 7B). V1, V2, V3, V4, V5, and V6 were single fault troughs, compound valleys, U-shaped, V-shaped, single fault troughs, and V-shaped, respectively.
4.3 Sedimentary facies
Based on drilling, thin-section, core, and seismic data, it was found the sediments under study represent fan deltas and lakes.
Fan deltas are composed of conglomeratic sandstone, fine sandstone, and mudstone, and their logging characteristics are dominated by a toothed bell shape and funnel shape (Figure 8). Wall-core data from the second member of the Shahejie Formation of Well C-1 indicated that it consists of light-yellow, gravel-bearing fine sandstone that is poorly sorted and rounded (Figures 9A–C).
FIGURE 8. Well C-1 to Well A-1 profile sedimentary facies, with developed fan delta deposits. The profile location is shown in Figure 6. Wireline logs are spontaneous potentials (SP) and gamma ray (GR); S1 = Member 1 of the Shahejie Formation; S2 = Member 2 of the Shahejie Formation; S3 = Member 3 of the Shahejie Formation.
FIGURE 9. Photographs showing S2 fan delta sedimentary characteristics in the study area. (A) Well C-1 wall core at a sampling depth of 2,704 m, consisting of light-yellow, gravel-bearing fine sandstone. (B) Well C-1 wall core at a sampling depth of 2,641 m, consisting of light-yellow, gravel-bearing fine sandstone. (C) Well C-1 wall core at a sampling depth 2,653.5 m, consisting of light-yellow gravel-bearing fine sandstone. (D) Well C-1 cast thin section at a sampling depth 2,707.5 m, shown in plane-polarized light and consisting of coarse sandy medium fine conglomerate with a gravel structure. The subangular gravel components are mainly crystalline rock debris, quartz, and feldspar debris. The grain size is between 2 and 3.2 mm, and it has poor sorting and poor rounding. (E) Well A-1 cast thin section at a depth of 2,096 m, shown in plane-polarized light and containing carbonate argillaceous silty feldspathic lithic sandstone, with a subangular shape roundness and a grain size of 0.02–1.2 mm.
Thin-section data from a depth of 2,707.5 m in the second member of Well C-1 showed that it contained coarse sandstone with fine gravel, which is poorly sorted and rounded (Figure 9D). The composition of clastic particles is 85%, the content of matrix is 5%, and the content of cement is 7%. The particle composition includes quartz, debris, feldspar, and a small amount of mica. The gravel and debris are mainly quartzite, shallow-grained rock, tuff, and granite.
Thin-section data from a depth of 2,096 m in the second member of Well A-1 showed that it is composed of carbonate containing argillaceous silty feldspathic lithic sandstone, with a particle size ranging from 0.02 to 1.2 mm and a high clay content (Figure 9E). The clastic particle composition is 79%, the matrix content is 7%, and the cement content is 9%. The gravel and rock debris are mainly quartzite, shallow grained rock, tuff, and metamorphic granite (Figure 9E). Thin section data show that the composition and mineral association of sandstone in the second member of the Shahejie Formation are well matched with quartz schist and granite in the Miaoxibei Uplift, and the sorting and roundness are bad, indicating that its source is from the Miaoxibei Uplift, the transport distance is relatively close and the accumulation rate is fast.
Given the relatively limited thickness layer of the second member (less than 50 ms and 50 m in the seismic and Well data, respectively), it appeared as a group of low-to-mid-frequency reflection phase axes in the seismic profile. This made it difficult to determine its external geometry and internal reflection structures (Figure 10). Therefore, the fan delta facies could only be distinguished from the shallow lake facies based on their seismic amplitude and continuity, which were characterized by medium to strong amplitude reflections and moderate to poor continuity. The drilling data showed that the mean amplitude seismic attribute of the second member had a strong response to the fan delta sedimentation and could be identified reliably (Figure 11).
FIGURE 10. Seismic profile image depicting Well C-1 through-well seismic section in the Miaoxibei area. The profile location is shown in Figure 11.
FIGURE 11. Schematic map layout showing seismic attributes and sedimentary facies of the Shahejie and Kongdian Formation in the Miaoxibei Area. (A) S2 interlayer average amplitude seismic attribute, where the yellow and red areas reflect sandstone. (B) S2 sedimentary facies plane distribution, converted from (A). (C) The Kongdian Formation and the fourth member of the Shahejie Formation. (D) The third member of the Shahejie Formation. (E) The first member of the Shahejie Formation. The amplitude interpretation and calculation methods are based on Tian et al. (2019). The interpretation indicates that a fan delta front developed in the second member of the Shahejie Formation, with isolated fan deltas in the south and amalgamated fan deltas in the north.
Logging data calibration of the seismic attributes (average amplitude value) of the second member showed that fan deltas feature an abnormally high amplitude (red and yellow areas) (Figure 11A). This indicated their planar distribution, which varied considerably, with isolated buds as the main type in the south and strip-like, vertically aligned longitudinal axes trending toward north-northwest in the north. The middle fan developed at a large scale, gradually decreasing toward both sides (Figures 11A, B).
5 Source-to-sink system paleogeographical reconstruction
5.1 Depositional area
Seismic data indicated that in the southern part of the study area, the second member of the Shahejie Formation was predominantly controlled by faults with large displacement, and formation margin erosion was weak (Figure 10), resulting in relatively well-preserved stratigraphic boundaries. In the north of the study area, the fault displacement was relatively small, and formation margin erosion was relatively strong, resulting in relatively bad-preserved stratigraphic boundaries. Based on the paleogeomorphological reconstruction results, the thickness of the second member of the Shahejie Formation in Bodong Sag is between 50 and 150 m, and it is thinner in the east, thicker in the west, thinner in the south, thicker in the north, and the depositional center is in the north, the erosion in the northern part was relatively strong, and the eroded strata extended farthest toward the east at 4.8 km (Figures 12A, B).
FIGURE 12. Contour map depicting residual and original thicknesses of the second member of the Shahejie Formation in the study area. (A) Residual thickness of the second member of the Shahejie Formation. (B) Original thickness of the second member of the Shahejie Formation. The blue dotted line represents the residual stratigraphic boundary, transplanted from (A). The restored stratum is the area clamped by the residual and original stratigraphic boundaries.
5.2 Source area
The Miaoxibei Uplift top surface geomorphological characteristics indicated that the slopes on the eastern and western sides of the main watershed are asymmetric (Figure 7A). According to modern geomorphological theory, several factors can cause slope asymmetry on either side of watersheds, such as the influence of geological structures and asymmetrical erosion at the base level and differences in rock properties or faults.
The study area structural characteristics suggested that the Miaoxibei Uplift western slope is gentle and belongs to the Bodong Sag gentle slope zone. In contrast, the eastern slope is steeper and belongs to the Miaoxi Sag steep slope zone (Figure 10). This indicates that the slopes on the Miaoxibei Uplift eastern and western sides may have been asymmetrical during the Bodong Sag rift stage.
The characteristics and scale of sedimentary filling (Figures 10, 11) indicate that the Paleogene strata in the Bodong Sag have a greater thickness and wider spatial distribution range compared with those in the Miaoxi Sag, which were thinner with a narrower spatial distribution range. In terms of the material conservation of the source-to-sink system, this suggests that during the Paleogene, erosion on the two sides of the Miaoxibei Uplift was uneven, with the western side experiencing stronger erosion than the eastern side. The main watershed gradually shifted to the east under the influence of uneven and asymmetrical erosion at the base level.
Based on this, the Miaoxibei Uplift erosion process was traced back by analyzing a series of seismic profiles (Figure 10). During the Paleogene, the main watershed position migrated from west to east (Figure 13A). Under the watershed migration pattern constraint, the Miaoxibei Uplift paleogeomorphological reconstruction was completed (Figure 13B). Based on paleogeomorphology reconstruction and under the constraints of geomorphology, the drainage system above the source of the study area was reproduced by means of digital differential erosion simulation and three-dimensional proportional fluid simulation, and the drainage system corresponding to the fan delta in the study area was picked up and combined (Figure 13B). The drainage system in the middle part of the Miaoxibei Uplift was larger in scale, extended longer and had more tributaries. The drainage systems in the south and north are smaller in scale, with shorter distances and fewer tributaries.
FIGURE 13. Schematic diagram and spatial image illustrating the Miaoxibei Area source-to-sink system reconstruction process and results. (A) The reconstruction process for source paleogeomorphology in the Miaoxibei Uplift and paleo watershed migration path. The original section is shown in Figure 10. From time T3 to T0, the paleo watershed migrated from west to east, and the reconstruction methods were derived from the literature (South China Agricultural University, 1980; Yang J. C, 1985; Helland et al., 2016). (B) The source-to-sink system paleogeographic reconstruction results in the Miaoxibei area. The north and south flanks of the uplift are high, the slope is steep, and the middle part is relatively gentle. The main watershed is distributed along the west side of the uplift long axis. The secondary watershed is distributed along the east–west direction, and the drainage system is scattered within the watersheds. The transport pathways and fan deltas correspond well, primarily developing isolated flower-shaped or continuous flower-shaped fan delta deposits. Large fan deltas developed in the northern and southern areas, with small fan deltas developing in the middle area.
Based on paleogeomorphology reconstruction and under the constraints of geomorphology, the drainage system above the source of the study area is reproduced by means of digital differential erosion simulation and three-dimensional proportional fluid simulation, and the main drainage system corresponding to the fan delta in the study area is picked up and combined in the form of lines (Figure 13B). The ancient water system in the central part of the temple northwest bulge is larger in scale, longer in extension distance and more tributaries, while it is smaller in the south and north with shorter in extension distance and fewer tributaries.
5.3 Reconstruction results
Based on the paleogeomorphological reconstruction in the sedimentary area and the sedimentary system distribution, as well as the paleogeomorphological reconstruction in the source area, the source-to-sink system of the second member of the Shahejie Formation in the Miaoxibei area was reconstructed (Figure 13B). The results show that the Miaoxibei Uplift northern and southern sides comprise large areas with high altitudes and a strong sediment supply capacity. The Miaoxibei Uplift main watershed gradually shifted to the east during the Paleogene, and the transport pathways corresponded well to the fan deltas. The study area southern part is dominated by isolated fan deltas, while the northern part is dominated by continuous fan deltas, with a larger scale in the central area and a smaller scale on the northern and southern sides.
5.4 Relationship between the elements of the source-to-sink system
According to the reconstruction results, the sources in the southern and northern parts of the study area comprise a large area at high altitude, resulting in large-scale fan delta development (Figure 13B). During the sedimentation period of the second member of the Shahejie Formation, the tectonic activity was mainly thermal subsidence and weak (Figure 2), with a relatively small influence on the source-to-sink system process. The bedrock types in the Miaoxibei Uplift were mainly granite and quartzite, and modern geomorphic research shows that their resistance to weathering is similar (Yu et al., 2013). Therefore, we can rule out the influence of strong tectonic movement and provenance lithology difference on the development scale of fan delta in the study area.
Based on the reconstructed results, the parameters of various source-to-sink systems in the study area are quantitatively calculated by the method of calculus (Amorosi et al., 2016; Liu E. T. et al., 2020) (Table 1), and the correlations among the elements of various source-to-sink systems are analyzed.
TABLE 1. Statistical table of source-to-sink system elements of the second member of shahejie formation in the study area.
The correlation analysis results of the height of the source, area of the source, volume of the source, length of the drainage system, and the cross-sectional area of the transport pathway show that (Figures 14A–D), the coefficient of determination (R2) of the volume of the source, area of the source, length of the drainage system, and cross-sectional area of the transport channel are all less than 0.5, in which the coefficient of determination of height of the source and the cross-sectional area of the transport channel is relatively high, and the R2 is 0.447. The cross-sectional area of the transport channel has low correlation with the length of the drainage system, area of the source, and the volume of the source.
FIGURE 14. Relationships between the Elements of Source-to-Sink System. (A) Relationships between sectional area of transport pathway and height of source. (B) Relationships between sectional area of transport pathway and area of source. (C) Relationships between sectional area of transport pathway and volume of source. (D) Relationships between sectional area of transport pathway and length of drainage system. (E) Relationships between Volume of fan delta and area of source. (F) Relationships between volume of fan delta and Height of source. (G) Relationships between volume of fan delta and volume of source. (H) Relationships between Volume of fan delta and length of drainage system. (I) Relationships between Volume of fan delta and width of transport pathway. (J) Relationships between Volume of fan delta and depth of transport pathway. (K) Relationships between Volume of fan delta and width depth ratio of transport pathway. (L) Relationships between Volume of fan delta and sectional area of transport pathway. Input data regarding the source-to sink parameters data are from Table 1. Regression-line equans and coefficients of determination (R2) are shown for all diagrams.
According to the correlation analysis results of the area of the source, height of the source, volume of the source, length of the drainage system, width of the transport pathway, depth of the transport pathway, width to depth ratio of the transport pathway, cross-sectional area of the transport pathway, and volume of the delta (Figures 14D–K), the volume of the source, width depth ratio of the transport pathway, and the volume of the delta have the strongest correlation, and the coefficient of determination (R2) are 0.55 and 0.78. The correlation between the area of the source, height of the source, depth of the transport pathway, width of the transport pathway, channel cross-sectional area of transport pathway, and volume of the delta is low, and the correlation is power function or polynomial, and the coefficient of determination (R2) is between 0.3 and 0.4. The coefficient of determination (R2) of length of the drainage system and the volume of the delta is less than 0.2, and there is no obvious correlation between them.
6 Discussion
6.1 Correlation between elements of source-to-sink system
In the study area, the volume of fan delta has a strong correlation with the volume of the source and the width depth ratio of the transport channel, but a weak correlation with the height of the source, area of the source, and the length of drainage system (Figure 14).
From the essence of “conservation of matter” in the “source-to-sink” system, the amount of denudation produced in the source directly determines the size of the delta volume (Xie et al., 2014; Helland et al., 2016; Zeng et al., 2019). Therefore, the delta volume should be the total amount of debris, which depends on the area of denudation, bedrock lithology, geomorphological characteristics, tectonic activity, and weathering intensity in the basin, independent of the transport distance and mode. This well explains the phenomenon in this study that the volume of delta is not obviously related to the transport distance, but is related to the volume of the source.
It is worth mentioning that the width depth ratio of the transport pathway in the study area has a strong correlation with the volume of fan delta, but too large or too small width depth ratio of transport pathway is not conducive to the large-scale development of delta. This phenomenon can be well explained in the theory of erosion cycle proposed by Davis in the middle of 18th century. The width depth ratio of the early development stage of the transport pathway is small, and the sediment flux is also small. In the middle stage, the ratio of width depth ratio was moderate and the deposition flux was maximum. In the late stage, the width depth ratio is larger and the deposition flux was smaller. A similar phenomenon has been reported in the case study of the “source-to-sink” system in the Bozhong Sag, where the width depth ratio of the transport pathway that is too large or too small is not always beneficial for delta enrichment (Zhou et al., 2017).
6.2 Significance for high-quality reservoir exploration
In areas where there has been relatively little exploration, traditional sedimentary facies research methods are predominantly based on well-log data to mark various geophysical features (Liu et al., 2016; Zhu et al., 2016; Ge et al., 2020; Zhao et al., 2021). The source-to-sink technique works effectively when well-log data is limited (Martinsen et al., 2005; Liu et al., 2019; Lin et al., 2022; Sambrook Smith et al., 2010; Sømme et al., 2009 Sømme and Jackson, 2013; Xu and Du, 2017; Xu et al., 2021; Zhou et al., 2017; Zhu et al., 2014; Zhu et al., 2017). Considering the Miaoxibei area as an example, the sedimentary facies of the second member of the Shahejie Formation have been determined using well-log data and seismic attributes (Figure 11), it was found that transport pathways and fan deltas corresponded more effectively in the study area (Figure 14B). Transport pathways, such as valleys and fault troughs on top of the bedrock, are inheritable and their positions do not change considerably (Yang J. C, 1985; Li, 1999). With a lack of drilling data, this indicates that in the middle and deep layers of the third and fourth members of the Shahejie and Kongdian Formations, the transport channel may also strongly correspond with the fan deltas. This approach can be used to replace drilling data for calibrating geophysical data identifying the distribution of sand-rich sedimentary facies.
The source rock mechanical properties, permeability, mineral composition, and chemical characteristics are likely to directly affect the source supply and reservoir storage performance (Zhu et al., 2017). The carbonate rock weathering products are often transported to the sedimentary basin in the form of dissolution (Yang J. c, 1985; Pei et al., 2008). There are relatively few clastic particles and weaker supply capacity, which often cannot form large-scale sedimentary bodies. After undergoing diagenesis, the calcareous cementation becomes strong, with relatively dense reservoir, which is not conducive to high-quality reservoir development (Li et al., 2005; Feng et al., 2009). The granite rock erosion mainly consists of surface, gully, and collapse erosion, with a strong supply capacity and a high sand fraction (Ruan and Zhou, 1995), providing the conditions needed for high-quality reservoir formation.
7 Conclusion
Reconstructing source-to-sink systems in ancient continental basins is challenging due to the limitations and irreversibility of geological records. Based on a detailed description of the source-to-sink system of the second member of the Shahejie Formation in the Miaoxibei area, combined with geomorphological theory and the sedimentary backfilling method, this study has established a new method for reconstructing ancient continental basin source-to-sink system paleogeography. The source denudation evolution history in the study area was identified, and the source-to-sink system paleogeography of the second member of the Shahejie Formation was reconstructed.
This study provides a typical example for ancient source-to-sink system reconstruction in continental basins. This method can help to reconstruct near-source type source-to-sink system paleogeography in other ancient continental basins and further inform future basin and mountain tectonic evolution studies. Additionally, it can play a key role in guiding further denudation evolution history analysis in the source area. The reconstruction results have shown the source area paleogeographic evolution and provided information on sedimentary supply for the basin filling process. The findings are of considerable importance in paleo sedimentary environmental studies. The source-to-sink system elemental reconstruction, such as the source, transport pathways, and sedimentary facies, deepens our understanding of the sedimentary mechanisms and distribution law of sand-rich sedimentary systems such as deltas, provides a reference for reservoir evaluation, and helps improve the success rate of reservoir prediction.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding author.
Author contributions
BF, YH, and HL contributed to conception and design of the study. TL organized the database. XD performed the statistical analysis. XH and XZ designed and conducted experiments. BF wrote the first draft of the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This study was supported by the National Natural Science Foundation of China (Grant Nos 42272113 and 42272115).
Acknowledgments
We gratefully acknowledge the Tianjin Branch of the China National Offshore Oil Corporation for providing data used in this study and permission to publish the results.
Conflict of interest
Author XD was employed by China National Offshore Oil Corporation. Authors XH and XZ were employed by Tianjin Branch of China National Offshore Oil Corporation.
The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Keywords: Bohai Bay basin, Miaoxibei area, paleogene, reconstruction, source-to-sink systems, sedimentology
Citation: Feng B, He Y, Li H, Li T, Du X, Huang X and Zhou X (2023) Paleogeographic reconstruction of an ancient source-to-sink system in a lacustrine basin from the Paleogene Shahejie formation in the Miaoxibei area (Bohai Bay basin, east China). Front. Earth Sci. 11:1247723. doi: 10.3389/feart.2023.1247723
Received: 26 June 2023; Accepted: 04 September 2023;
Published: 09 October 2023.
Edited by:
Lawrence H. Tanner, Le Moyne College, United StatesReviewed by:
Entao Liu, China University of Geosciences (Wuhan), ChinaChao Fu, China National Offshore Oil Corporation, China
Copyright © 2023 Feng, He, Li, Li, Du, Huang and Zhou. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Youbin He, MTAwNzA5QHlhbmd0emV1LmVkdS5jbg==