A study on permeability along strike slip faults in Shunbei reservoir of Tarim Basin, China
Qiang Wang, Zhixing Ru, Rui Zhao, Yu Chen, Yuqing Liu, Shang Deng
Abstract
For ultra deep strike-slip faults controlled reservoirs, the permeability along the faults directly determines the distribution of favorable reservoirs. The present in-situ stress has a significant influence on the permeability of the faults. Therefore, it is meaningful to study the relationship between in-situ stress and permeability along the strike-slip faults for exploration and development of Shunbei oilfield. Based on seismic and coherent data, a three-dimensional model of strike slip fault in reservoir is established. The size and direction of in-situ stress are determined by rock mechanics test. Combined with drilling history and imaging logging data of typical wells, natural fractures are analyzed. Finally, the slip tendency coefficient of Shunbei 5 strike-slip fault zone is simulated by using the finite element method. It is found that there is a positive correlation between the slip tendency coefficient and permeability along the strike-slip fault. The critical slip tendency coefficient of Shunbei 5 fault zone is 0.35 (the fault is in the critical open state). This study provides a reference for the prediction of favorable reservoir distribution and the selection of drilling targets for Shunbei ultra deep strike-slip fault zones.