| The upper apleozoicin of Daning-Jixianblock has great potential for unconventional natural gas resources.of which shale gas reservoirs are mainly concentrated in Shan 2 member.In the past,a large number of researches focused on the related research on the overall physical properties of the reservoir in Daning-Jixian block,while ignoring the comparative research on the differences in the fine petrological characteristics,diagenetic fabric,pore types and controlling factors of the differences in secondary pores of the sandstone reservoir in Shan 2 member of the eastern and western region in the study area.this topic will take Shan2 member in Daning-Jinxian block of as the research object,clarify the secondary pore difference and its control factors between the eastern and Western reservoirs in the study area,so as to summarize the constraints of sedimentation and diagenesis on the physical properties of the reservoir,and predict the potential high-quality reservoir in the study area.On the basis of making full use of the research data of predecessors in Daning-jixian block,this paper mainly analyzes and studies the different characteristics and controlling factors of rock lithology and pore types in the east and west through field outcrop observation,drilling histogram and observation and analysis under the microscope of sample slices.The controlling factors of pore difference in sandstone reservoirs of Shan 2 member of the eastern and western mountain in the study area of Daning-Jixian include sedimentary facies,provenance,diagenesis,etc.Sedimentary facies of the target horizon in the study area mainly include underwater branch channels,inter-channel bays,etc.The difference of material sources and sedimentary facies lead to the difference of rock lithology between the east and west.The difference of rock texture also laid the foundation for the difference of diagenesis in the later period.It is precisely because of the difference of dissolution that the types and sizes of sandstone pores in the west are quite different. |
