Full
XU Chunqiang,born in 1984,is a senior engineer. He is mainly engaged in comprehensive study of petroleum geology. E-mail: xuchq2@cnooc.com.cn.
Outline
The study of source-to-sink systems plays a pivotal role in predicting sand-body distribution and lithologic trap configurations within rift basins. During the Paleogene,diverse palaeogeomorphological features developed along the eastern segment of the Shinan steep slope zone in the Bozhong sag—creating an ideal natural laboratory for investigating multiple source-to-sink system types. Nevertheless,research on temporal evolution of these systems remains limited,particularly due to the scarcity of quantitative analyses linking palaeogeomorphic architecture to sedimentary sand-body characteristics—a gap that significantly hinders the identification and prioritization of prospective exploration targets. Integrating 3D seismic data,core observations,and well-log interpretations,this study conducts a systematic characterization of Paleogene palaeogeomorphology and source-to-sink system architecture in the study area. We elucidate how sediment transport systems govern the spatial organization of depositional systems and establish stage-specific source-to-sink coupling models and palaeogeomorphology-controlled sediment dispersal frameworks. Our analysis identifies four principal sediment transport pathways: paleo-valleys,fault-controlled troughs,structural accommodation zones,and slope-break zones. Paleo-valleys are further classified into U-shaped,V-shaped,W-shaped,and composite morphologies;among these,U-shaped valleys exhibit the highest sediment transport efficiency,whereas V-and W-shaped variants demonstrate comparatively lower capacity. Fault-controlled troughs display asymmetric half-graben fill geometries,while structural accommodation zones develop in response to fault activity intensity—thereby regulating sediment entry points. Slope-break belts are subdivided into four categories: steep fault-terrace,gentle,fault-scarp,and intra-basin slope-break zones. A statistically robust positive correlation is observed between key palaeogeomorphic parameters—including catchment area of uplifted source regions,valley length,total valley distribution area,and valley count—and both the volume and lateral extent of associated sedimentary bodies. Finally,integrating transport distance from source and pathway type,we propose a two-tier(proximal vs. distal)classification scheme comprising five distinct subtypes,each supported by a corresponding source-to-sink coupling model.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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