The Main Controlling Factors Of Lower Jurassic Sangonghe Reservoirs In Fubei Of The Eastern Junggar Basin

In this paper,Based on the lower Jurassic in eastern Junggar basin,the sandstone reservoir of Sangonghe Formation as the research target,according to the method in the study of reservoir lithology,physical property,diagenesis,combining previous research results,through on the basis of the description field profile survey,core observation,combined with the casting thin sections,X-ray diffraction,scanning electron microscopy(SEM),physical property,nuclear magnetic resonance(NMR),constant speed mercury injection data comprehensive analysis,etc.The following conclusions are drawn from this study:The sandstone type of the Lower Jurassic Sangonghe Formation in the study area is mainly composed of feldspar sandstone,followed by lithic sandstone,medium-coarse feldspar sandstone and lithofacies sandstone.The reservoir space is mainly residual grain And the micro-pore throat structure belongs to the small hole throat-micro-throat.The overall physical deviation of the reservoir physical property is one of the physical and pore structures of the Sangonghe Formation.Section first is better.Sangonghe Formation belongs to the braided river delta front subfacies sedimentary,the delta frontwater underwater distributary channel microphase hydrodynamic strongest,the reservoir muddy miscellaneous content is the lowest,easy to form "clean" sand body,for the formation of high quality Reservoir laid the foundation.Compaction is the most important destructive diagenetic effect of reservoir physical properties,resulting in irreversible reduction of reservoir physical properties.Leaf-like chlorite,calcite,quartz,kaolinite and other cements in the middle diagenetic stage block the pore throat The reservoir property is deteriorated.In the early diagenetic stage,the ring-like chlorite cementation and the overpressure of the formation are favorable for the preservation of the intergranular pores,and the dissolution in the middle diagenesis stage to form the secondary reservoir zone with favorable reservoir development,which further improves the reservoir property.The above research results will provide an important basis for enriching the geological knowledge and the oil and gas exploration in Sangonghe Formation of the Fukang East Ring Zone in the Junggar Basin.