Author(s): Xu Shang, Zou Huayao, Hao Fang, Wang Yingbin, Wang Deying, Chen Gang, College of Geosciences, China University of Petroleum, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Tianjin Branch, CNOOC Ltd., Department of Petroleum Geology, Research Institute of Petroleum Exploration & Development, PetroChina
Pages: 363-369+7
Year: 2015 Issue:  2
Journal: Oil Geophysical Prospecting
Keyword:  interbed fault; seismic facies; slice; coherence cube; variance cube; ant tracking;
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 1located in the western of study area with the highest fault density(5~6n/km),and interbed fault main strike directions on rose diagram are135°and 50°;Group 2located 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 3located in the eastern of study area,the medium fault density(3~4n/km),and interbed fault main strike directions on rose diagram are140°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.