Study On Sedimentary Facies And Reservoir Characteristics Of Dongying Formation In Hejian Area,Raoyang Depression

According to the needs in production and problems of prospection in Hejian oil field of Raoyang depression, sedimentary microfacies, reservoir characteristics of Dongying formation of Hejian district has been studied in this paper.Use of drilling and logging data, and combined with the principle, the sequence stratigraphic division and correlation, dongying formation of HeJian area is divided into five oil groups 47 small layers.According to information of logging, rock cores, Dongying formation of Hejian oil field in Raoyang depression has developed braided delta plain facies, and braided delta plain facies can be divided into braided channel and river lake aimless.The direction of braided channel is from northeast to southwes, and the sources should be Xianxian uplift.Based on physical property analyze and survey on rock chip of coring wells , compaction,denudation, cementation,metasomasis and rejuvenation of crystals has been experienced in the study area.The main developments pore and crack two reservoir space type, and the major one is secondary dissolution pores between grains. The primary influential factors are rock types, sedimentary microfacies and dissolving effect.Through studies on parametric of reservoir heterogeneity, the heterogeneity degree of main sandstone layer are medium heterogeneity.Ed3â… oil group of interlayer is most anisotropic. With researches on anisotropic characters of surface exhibition cloth,sandbody connectivity and sandbody forms, aribbon,flake,interweaves a ribbon and isolated sandbody are distributed in the study area,always connected rate of sandbody in all the oil group are high, and the Ed3II oil group has the largest oil group total connected rate, Explain sand body more development.Based on the analysing of the features of the depositional microfacies,the types of the rocks,the storage space and the pore configurations in the study area,we have made a comprehensive evaluation of the reservoirs in the study area and divided the reservoirs into three Types. Typeâ… ,the reservoirs is mainly distribute at heart beach,Typeâ…¡,the reservoir is riper in channel sandbody,Typeâ…¢, the reservoir is distributed in natural levees, washland.