The Heterogeneity Of Reservoir Characterization And Geological Modeling Of X8 Member Of Xihefu Formation In Kekeya Condensate Gas Field

Kekeya condensate gas field is in the mid and late development at present.The composite decline of oil and gas continues to rise.It has a grim situation of the production.The main problem is that the reservoir heterogeneity of purpose layer is strong.It has inadequate understanding about distribution of reservoir.It has no idea about distribution of oil and gas remaining.The research object is X8 member of Xihefu formation.The guiding ideology is a multidisciplinary theory knowledge.All sorts of dynamic and static data in the study area are efficiently used.The stratigraphic correlation,sedimentary microfacies.reservoir heterogeneity and 3D geological model are studied.X8 member is divided into seven small layers and the stratigraphic framework is set up close by consulting the marker layers and the principle of isochronous and hierarchical control.The core and log data are used to determining X8 member for fan marginal subfacies in alluvial fan,and the regional sedimentary research results are combined.The template about logging interpretation of sedimentary microfacies is established.The sedimentary microfacies are divided into three: branch of braided river channel,branch of braided river channel flank and interchannel.Based on the stratigraphic and sedimentary microfacies research,getting statistics of heterogeneity parameters to quantitative description of reservoir heterogeneity by using the heterogeneous synthetic index method.X8 member has stronger interlayer heterogeneity,medium – strong intraformational heterogeneity and strong plane heterogeneity.Through the early stage of the research to establish tectonic model,facies model and property model.Facies model of multipoint geostatistics method is adopted,and the effect is better.Characteristics of physical parameters of the spatial distribution and sedimentary microfacies distribution characteristics.Based on the above research,it provides theoretical foundation and scientific basis for improving the residual oil and gas recovery factor and the injection-production well pattern in the study area.