Characteristics and genesis of lacustrine mixed rock reservoirs in Jurassic Da'anzhai Member,Puguang area
The Da'anzhai Member of the Jurassic Ziliujing Formation in Sichuan Basin is one of the important continental tight gas exploration strata.Based on the macroscopic observation of outcrop and core,thin section identification,X-ray diffraction and reservoir properties,it is confirmed that the mixed rock reservoir in Da'anzhai Member of Puguang area has developed in scale.The results show that:(1)The mixed rock reservoir lithology of Da'anzhai Member can be divided into three main types,namely clay,sandy and calcareous mixed rocks.(2)The main types of reservoir space are intercrystalline pores,inorganic pores,shell boundary fractures and micro-fractures.(3)The mixed rock reservoir is mainly developed in the shallow to semi-deep lacustrine facies area,which is controlled by the lake plane fluctuation,topographic slope,storm and gravity flow,and is the product of phase mixing and discontinuous mixed sedimentation.
mixed sedimentationstorm flowgravity flowDa'anzhai MemberPuguang area
NETL
NSTL
万方数据
