A study on reservoir architecture difference of extra-deep strike-slip fault zone in the Shunbei area, Tarim Basin

Abstract

Shunbei reservoir is a typical extra-deep carbonate strike-slip fault-controlled reservoir. It has experienced multi-stage tectonic activities, and strong heterogeneity and anisotropy are present in the reservoir. Based on the reservoir cores, imaging logging, pressure build-up curves of typical wells, and dynamic analysis, the reservoir architecture difference between the S-1 and S-5 strike-slip fault zones in the Shunbei area is studied. The results show that the reservoir architecture of the S-5 fault zone is a fault-fracture system formed under the compressive stress environment, with small internal space, poor fluid flow capacity, small reservoir scale, and low energy. However, the reservoir architecture of the S-1 fault zone is the dilational space and caves bounded by fault planes formed under the tensile stress environment. The reservoir space could be categorized as the fault-fracture-cave system, which has large internal spaces and fluid flow capacity. Moreover, the reservoir is substantial in size and is highly energetic. This study has clarified the difference in reservoir architecture between the S-1 and S-5 fault zones and could be used as a classic case to predict the fault-reservoir relationship in the Shunbei area. It is of great significance for the exploration and development of the extra-deep carbonate strike-slip fault-controlled reservoir.