Interbed fault identification in the Ed2 Formation, Southern Shijiutuo Uplift, Bohai Bay Basin, China
Xu Shang12, Zou Huayao1,2, Hao Fang2,3, Wang Yingbin4, Wang Deying4, Chen Gang5
1. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
4. Tianjin Branch, CNOOC Ltd., Tianjin 300452, China;
5. Department of Petroleum Geology, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Abstract：A series of interbed faults have been identified by an integration of multiple geophysical approaches such as coherence cube, variance cube, ant tracking and so on. These faults were developed along a lithological interface which separates thick sandstone from the underlying mudstone in the second member of the Dongying Formation (E3d2), Bohai Bay Basin, China. They are characterized by small fault throw (commonly no more than 100 m), small lateral extension, and high fault density. Depending on the characteristics of interbed faults, we divide them into three groups: Group 1 located in the western of study area with the highest fault density (5~6n/km), and interbed fault main strike directions on rose diagram are 135° and 50° Group 2 located in the centre of study area with the lowest fault density (2~3n/km), and interbed fault main strike direction is 30°, and the other strike directions displays radiational; Group 3 located in the eastern of study area, the medium fault density (3~4n/km), and interbed fault main strike directions on rose diagram are 140° and 25°. The integration of the multiple geophysical approaches provides an effective way to identify small interbed faults. As important conduits for fluid expulsion, these faults need further research in hydrocarbon migration and accumulation in the area.
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