Discussion on reservoir prediction and reservoir-accumulating feature in Putaogou area of Tu-Ha basin
Zhang Jin-xue1,2, Dai Yu2, Qu Zhan-hai3
1. China University of Petroleum,Dongying City,Shandong Province, 257061,China;
2. Urumqi Branch of BGP,Urumqi City,Xinjiang Uygur Autonomous Region, 830016,China;
3. Changqing Department of Management,BGP,Yinchuan City,Ningxia Hui Autonomous Region, 750006, China
Abstract：Putaogou area is one of the benefit blocks enriching oil and gas in Tu-Ha basin. Integrative research showed that the Qiketai Formation the major objective horizon in Putaogou area is a set of braid river delta sedimentary system that the material source comes from near-western area, developing benefit reserving facies such as underwater branching channel and beach sand bar, and Qiketai Formation reservoir type mainly is structural reservoir such as anticline and faulted anticline: upper reservoir mainly is edge water layered reservoir and lower reservoir mainly is bottom water block oil pool; Sanjianfang Formation reservoir mainly is structural-lithologic reservoir. Good consistence between paleotectonic and current structure, favorable reserving facies zone and Yanshan Period-formed faults sealing off reservoir are major controlling factors of reservoir accumulation. South anticline zone in hanging wall of fault and north slop zone in Huoyanshan mountainous area are next interesting direction of exploration for structural and structural-lithologic traps.
