The Characteristics of Fault Accommodation Zones and Its Significances in Petrolum Geology in Gaoyou Depression, Subei Basin, China

Wang, Weifeng ¹; Li, Baogang ¹; Xin, Ye ^1
1 College of Geo-Resources and Information, China University of Petroleum(East China), Dongying, China.

The fault accommodation zone is a significant geologic structure which regulates the kinematic equilibrium in tectonically deformed zone. Four big fault accommodation zones are identified in Gaoyou depression, namely Zhenwu-Wubao synthetic-overlapping fault accommodation zone, Zhen 2 inside fault synthetic-overlapping fault accommodation zone, Wu 1 inside fault synthetic-collinear fault accommodation zone, Hanliu-Wu 2 fault antithetic-collinear fault accommodation zone. Study of the sedimentation, tectonics and oil & gas pools of Gaoyou depression shows that the synthetic fault accommodation zones are apt to form water systems, with various sedimentary fans and structural traps developed, and are close to the oil-generating center, so they are places of main oilfields in Gaoyou depression. While antithetic fault accommodation zones, forming uplifts of low amplitude normally, are not favorable to oil and gas pooling for absence of water systems and sand bodies, and long distance from oil-generating centers.

AAPG Search and Discovery Article #90090©2009 AAPG Annual Convention and Exhibition, Denver, Colorado, June 7-10, 2009