China Petroleum Exploration ›› 2007, Vol. 12 ›› Issue (5): 22-25,78.

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Favorable Conditions for Forming Permian Gas Reservoirs in Zhongguai 158 Area in Northwestern Margin of Junggar Basin and Their Main Controlling Factors

Chen Lei,Yang Haibo,Qian Yongxin,You Xincai and Zhao Changyong   

  1. Chen Lei,Yang Haibo,Qian Yongxin,You Xincai,Zhao Changyong Exploration and Development Research Institute of PetroChina Xinjiang Oilfield Company,Karamay City,Xinjiang Uygur Autonomous Region 834000
  • Online:2007-10-15 Published:2007-10-15

Abstract: The southwest of Zhongguai 158 area is next to three major source sags including Mahu Sag, Pen1 WellWest Sag, and Shawan Sag. It is longterm in favorable directional zone of hydrocarbon migration and hence has a sound basis at resources. Reservoir-cap assemblages, passage systems, effective traps, and preservation conditions are favorable for forming gas reservoirs. So it is possible to develop medium and small sized gas fields in the area. Based on the analysis of the typical gas reservoirs in the area, Permian Jiamuhe Formation and UpperWuerhe Formation are taken as main targets for natural gas exploration. Unconformity surfaces, sedimentary facies belts, and faults are main factors that affect gas accumulation of Permian Formation. Favorable sedimentary facies belts near unconformity surfaces of Permian Formation are the main target for natural gas exploration.

Key words: Junggar Basin, natural gas, Permian, pool-forming condition, main controlling factor

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