Jurassic Reservoir Characteristics Of Pore Structure And Seepage In Moxizhuang-Yongjin Area In Central Junggar Basin

Jurassic reservoir microscopic pore structure and seepage characteristics of system research of Moxizhuang-yongjin area in central Junggar Basin,collecting a large number of relevant materials and grasping the present research status fully in research area.on the basis of previous studies,establishing reservoir classification evaluation standard in the study area aims to further providing geological basis for the exploration and development work.Observation and sampling of core in the early stage,mainly through observation and analysis of thin section and cast section,combined with X-ray diffraction,SEM,and physical property tests,using high-pressure mercury injection and nuclear magnetic resonance technology to analyze petrological characteristics,pore structure,and Comprehensive study of seepage characteristics.Main results and knowledge are as follows:The lithofacies in Sangonghe Formation in Shawodi area is mainly feldspathic litharenite sandstone.And their pore types are residual intergranular pores with 20% dissolved pore.The Moxizhuang Sangonghe Formation is dominated by feldspathic litharenite and litharenite as a whole,The type of pores is mainly remaining intergranular pores,The content of dissolved pores is about 30%,which is slightly higher than that of Shawodi.The main types of Moxizhuang throats are pore-reduced and necked throats.The main rock type of the Sangonghe Formation in Zhengshacun is feldspathic litharenite,and the pore types are remaining intergranular pores and dissolved pores,each accounting for nearly 50%.The content of dissolved pores is higher than that of Shawodi and Moxizhuang areas,The main types are flaky and curved throat.The Xishanyao Formation in Yongjin area is dominated by feldspathic litharenite and litharenite,Sandstone reservoirs have developed grain marginal fractures,and are dominated by flaky and curved throats.Shawodi reservoir is medium-porosity and medium-permeability,Moxizhuang and Zhengshacun reservoirs are low-porosity and low-permeability,and Yongjin reservoir is an ultra-low-porosity and ultra-low-permeability.The curve types of Shawodi are mainly type ? and ?,and the average movable fluid saturation is 70%,indicating a type ? reservoir.The curve types of Moxizhuang are mainly type ? and ?,and the average movable fluid saturation is 50%,indicating a type ? reservoir.The curve types of Zhengshacun are mainly Type ? and ?,and the average movable fluid saturation is 42%,indicating a type ? reservoir.The movable fluid saturation reservoir in Yongjin is evaluated as type ?.The Shawodi in the research area has the best reservoir properties,with diverse reservoir types,high movable fluid saturation and good classification.The throat type is mainly large-medium throat.Comprehensive evaluation of various factors,Shawodi reservoir is the best,the Moxizhuang reservoir level is good,and the Zhengshacun and Yongjin area are poor.