Facies-controlled Reservoir Evaluation Of Shuangyang Formation In Moliqing Rift,Yitong Basin

With the exploration progressing and technology improving,subtle reservoir has become a hot spot in petroleum and gas exploration domain.The glutenite reservoir is an important one of the issues.This kind of reservoir has complicated lithology,strong heterogeneity and complex pore structure.And commonly,its porosity and permeability are low.All these features make for the difficulty of evaluating the glutenite reservoir.It's hard to building a unified standard of evaluation.New methods are needed to evaluate the physical property of this kind of reservoir in appropriate ways with the existing logging technology.Glutenite reservoirs are wildly distributed in the rift lacustrine basin in eastern China.This kind of reservoirs is related to gravity flow deposition.Because of the short distance from the provenance and rapid accumulation,the Glutenite reservoirs have low structural and compositional maturity.The relations between lithology,electrical property,physical property and oil-bearing range from different sedimentary environments.It's inappropriate to use one standard to evaluate reservoirs of different facies in a basin.So in this article,the reservoirs of Shuangyang Formation in Moliqing Rift,Yitong basin will be researched with facies controlled.The well data in the study area will be classified into four kinds according to different sedimentary environments: binshore subaqueous fans,fan delta,deepwater turbidite fan and braid-river delta.The reservoir of each facies will be analysed and evaluated along.The modeling to interpret the lithology,porosity and permeability from logging will be built according to different kinds of facies.Thus the accuracy of interpretation can be improved.Meanwhile,Comparing the relation of the four characters between reservoirs of different facies can help to evaluate the areas with no core data.