Mizhi Suide Area He 8 And Shan 2 Reservoir Diagenetic Evolution Analysis And Material Characteristics Of Diagenesis

MiZhi-SuiDe area in the east ordos basin natural gas exploration results show that the He 8,Shan2 and although sand body development,gas-bearing area is larger,but the gas reservoir with low porosity,low permeability,low abundance,low pressure and low yield,etc.Sandstone lithology is complex,sandstone detrital composition with quartz as the representative change is big,the stability of the component content and sandstone mixed base content is generally higher,development of occurrence of rich and colorful illite and kaolinite clay minerals.Throughout the comprehensive analysis of the existing research results show that the evolution of sandstone diagenesis and reservoir physical property and gas accumulation are closely related.The region has a broad cover hydrocarbon generation of gas-bearing characteristics,the distribution of the large area of shanxi formation of mature and dark mudstone are the main gas source rock,coal and rock on the background of low porosity,low permeability of development is given priority to with quartz sandstone lithology,or formed by the volcanic materials and carbonate dissolution of a large number of secondary dissolution pores make lithic sandstone and lithic quartz sandstone part of the development of high porosity,high permeability zone,is an effective reservoir of gas occurrence,effective reservoir distribution rule is not clear,complex reservoir mineral composition,heterogeneity and strong sensitivity,fracturing effect such as a series of problems,restricted the eastern basin gas the pace of further exploration.Based on the shan2-He 8 period of clastic sedimentary facies,sand structure,reservoir characteristics and diagenetic facies distribution,gas-bearing bed thickness,pore permeability distribution and other comprehensive analysis,combining with the testing results,for the development of sand body prediction and evaluation,group focuses on stone effect analysis of characteristics and evolution of reservoir physical factors affecting reservoir physical property,has a guiding significance for gas exploration.