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A RESEARCH ON THE DIAGENESES OF J_(3p) SANDSTONE RESERVOIRS IN WEST SICHUAN DEPRESSION

Ai Huaguo and Lan Linying(Exploration Research Institute of China National Star Petroleum Corporation)and Zeng Xiaoying and Liu Meiqing(Exploration and Development Research Institute of Southwest Petroleum Bureau).NATUR.GAS IND.v.20,no.2,pp.21~26,3/25/20  
Through diagenetic research it is shown that the Penglaizhen Formation reservoirs within studying area suffered compaction,cementation and corrosion.Because of suffering a series of diagenetic reforms,the porosities of the reservoirs were 12%~14% averagely during oil entering period,pores being composed of remaining intergranular pores,intragranular solution pores,intergranular solution pores,moldic pores,solution fissures and the solution pores in cements,etc.In light of the research on the factors controlling diageneses it is indicated that along with the increase in compaction strength and the enhancement of the cementation of calcite and gypsum,etc.,the porosity of the reservoir would be decreased linearly;however,along with the increase in corrosive level,the porosity of the reservoir would be obviously raised.
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