Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 95-104.doi: 10.12108/yxyqc.20250409

• PETROLEUM EXPLORATION • Previous Articles    

Sand control patterns of fault-landforms-sedimentary slope break and their significance for oil and gas exploration： A case study of the northern section of Baochu slope zone in Xihu Sag，East China Sea Basin

ZHENG Xin, JIANG Donghui, LI Kun, ZHUANG Jianjian, ZHANG Chuanyun, YANG Chao, YUAN Zhongpeng, WANG Jiaqi   

  1. Institute of Petroleum Exploration & Development, Sinopec Offshore Oil & Gas Company, Shanghai 200120, China
  • Received:2024-10-14 Revised:2025-01-06 Published:2025-07-05

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Abstract: Sequence characteristics and structural combination characteristics of faults of the oil and gas bearing strata of Paleogene Pinghu-Baoshi Formation in the northern section of Baochu slope zone of Xihu Sag in East China Sea Basin were studied by using drilling core，logging and 3D seismic data. The paleogeomorphology was restored through DepoSpace sedimentary domain modeling and sequence stratigraphic boundary difference method. Based on the dip attribute of paleogeomorphology，the types of slope breaks were quantitatively classified，and the sand control mechanisms of different types of slope breaks were explored. The results show that： （1）Paleogene Baoshi-Pinghu Formation in the northern section of Baochu slope zone in Xihu Sag was divided into three structural zones from west to east： the Jinlong Mountain，Longyi Mountain，and Yuanlong Mountain. 7 thirdorder sequences have been identified，with 3 in Baoshi Formation and 4 in Pinghu Formation. In the research area，faults develop and can be divided into 5 fault combination patterns， such as sliding fault step，parallel fault step，graben barrier combination，flower like structure，and“Y” -shaped combination.（2）The slope break in the research area can be classified into fault slope break（level Ⅰ），landforms slope break（level Ⅱ）and sedimentary slope break（level Ⅲ）. The sand control mechanisms of the 3 types of slope break are different. Fault slope break is significantly affected by structural fault，landforms slope break is affected by both structural bending and sedimentary transformation，while sedimentary slope break is mainly affected by sedimentary erosion. （3）4 types of sand control patterns develop in the research area，including fault-landforms slope break broom shaped sand control pattern of the graben barrier fault combination of Jinlong Mountain，landforms-sedimentary slope break sand control pattern of Longyi-Yuanlong Mountain，multi-stage broken step fault slope break sand control pattern of Longyi-Yuanlong Mountain，parallel fault trough fault slope break sand control pattern of Jinlong-Yuanlong Mountain.（4）In the research area， the slope breaks control the development of sedimentary bodies. The footwall of level Ⅰ slope breaks often develop landslide deposits with distant landslides，the footwall of level Ⅱ slope breaks develop steep slope deposits，and the footwall of level Ⅲ slope breaks develop gentle slope deposits. Branch waterways often flow through the area with smaller slope angles on level Ⅱ and Ⅲ slope breaks， and they are prone to form slope fans at the foot of level Ⅰ and Ⅱ slope breaks when flow through them.

Key words: paleogeomorphology restoration, fault slope break, landforms slope break, sedimentary slope break, sand control mechanism, Pinghu Formation, Baoshi Formation, Paleogene, northern section of Baochu slope zone, Xihu Sag

CLC Number: 

  • TE121.2
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