Fine Reservoir Interpretation Of Shaximiao Formation On The Eastern Slope Region Of The West Sichuan Depression

The western Sichuan depression is formed by the gradual transition from west to east along the front of the Longmenshan thrust belt,and its area is about 80000 kilometers,including Zhongjiang-huilong,Gaomiao-fenggu and Zhixinchang three districts.The Shaximiao Formatio,which is in the eastern slope of western Sichuan depression,have been developed Section I?Section ? and Section ? from the bottom to the top.The sediments of Shaximiao Formation are mainly composed of sand and mud interbed combination,mainly presented the sedimentary features of braided river deltathat.Shaximiao Formation have a good condition about oil and gas' s formation,reservoir,migration,trap,accumulation and preservation.but because of the level of exploration and development become higher,oil and gas resources mining become more difficult,and due to the different logging sequence,the diversity of lithology,the complexity of oil and gas distribution and other factors limit the study and understanding of the reservoir.Thus,this paper is based on the basis of previous studies,use geological data,logging data,drilling data,test gas data,core sheet and production dynamics and other information,first,pretreat the logging data and analysis the four properties' relations of oil reservior,and then establish oil and gas water identification standards and plates for reservoirs in the study area,correctly identify oil-gas-water and described evaluate the formation,analyze the favorable oil and gas zone in the study area,and guide the exploration and development of oil and gas in the area.In this paper,through the above research,the following results are achieved:(1)The reservoirs in the study area are low porosity and low permeability reservoir.The reservoir physical characters is worse,weak in natural seepage;(2)Established the region of the fluid identification plate,gas' s AC?71?.m,RD?24?s/m;(3)The empirical method is used to determine the lower porosity of the effective reservoirs in this zone is 6.5%,the lower limit of permeability is 0.05 md,the linear regression analysis with the porosity measured by the reservoir core laboratory shows that the solution model has high reliability and meets the storage(4)Standard accuracy requirements;(5)According to the lithology,physical and other factors will be divided into three types of reservoirs.The comprehensive evaluation shows that the I class reservoir performance is the best,the porosity is more than 12.5% and the permeability is more than 0.25 md.