Differences in hydrocarbon accumulation and controlling factors of slope belt in graben basin: A case study of Pinghu Slope Belt in the Xihu sag of the east China Sea Shelf basin(ECSSB)  

作　　者：Bo Yan Hong-Qi Yuan Ning Li Wei Zou Peng Sun Meng Li Yue-Yun Zhao Qian Zhao 

机构地区：[1]College of Earth Sciences,Jilin University,Changchun,130061,Jilin,China [2]School of Geosciences,Northeast Petroleum University,Daqing,163318,Heilongjiang,China [3]Research Institute of CNOOC Shanghai Branch,Shanghai,200030,China

出　　处：《Petroleum Science》2024年第5期2901-2926,共26页石油科学（英文版）

基　　金：funded by the Natural Science Foundation of Heilongjiang Province (LH 2022D013);supported by the Central Support Program for Young Talents in Local Universities in Heilongjiang Province (14011202101);Key Research and Development Plan Project of Heilongjiang Province (JD22A022)。

摘　　要：The Pinghu slope belt in the Xihu sag of the East China Sea Shelf Basin(ECSSB) is a crucial hydrocarbon production area in eastern China. However, due to the complex geological conditions, publications have lacked comprehensive research on the spatial-temporal coupling relationships of primary factors that impact hydrocarbon accumulation in the Pinghu slope belt. Furthermore, the hydrocarbon distribution patterns and the controlling factors across different study areas within the same slope belt are not yet fully understood. This study extensively utilized three-dimensional seismic data, well logging data,geochemical analysis, fluorescence analysis, and oil testing and production data to address these issues.Following a “stratification and differentiation” approach, the study identified seven distinct hydrocarbon migration and accumulation units(HMAU) in the Pinghu slope area based on the structural morphology characteristics, hydrocarbon source-reservoir-cap rock patterns, hydrocarbon migration pathways, and hydrocarbon supply range. Detailed analysis was conducted to examine the hydrocarbon distribution patterns and controlling factors within each migration and accumulation unit across different structural units, including high, medium, and low structural components. All data sources support a “southern-northern sub-area division, eastern-western sub-belt division, and variations in hydrocarbon accumulation” pattern in the Pinghu slope belt. The degree of hydrocarbon accumulation is controlled by the factors of structural morphology, hydrocarbon generation potential of source rocks, the spatial position of source slopes, fault sealing capacity, and sand body distribution. Furthermore, different coupling patterns of faults and sand bodies play a pivotal role in governing hydrocarbon enrichment systems across various migration and accumulation units. These observations indicate that three hydrocarbon accumulation patterns have been established within the slope belt, including near-source to far-source gen

关 键 词：East China Sea Shelf Basin(ECSSB) Pinghu slope belt Variation in hydrocarbon accumulation Controlling factors of hydrocarbon accumulation Hydrocarbon accumulation pattern 

分 类 号：TE34[石油与天然气工程—油气田开发工程]