川西坳陷雷四3亚段储层控制因素及孔隙演化特征  

Reservoir characteristics and control factors of the third period of the forth Leikoupo formation in western Sichuan depression

作　　者：李蓉[1,2] 许国明[2] 宋晓波[2] 隆轲[2] 王东[2] 

机构地区：[1]中国石化西南油气分公司博士后科研工作站,四川成都610041 [2]中国石化西南油气分公司勘探开发研究院,四川成都610041

出　　处：《东北石油大学学报》2016年第5期63-74,共12页Journal of Northeast Petroleum University

基　　金：中国石化科技开发部基金项目(P15101)

摘　　要：根据岩心、薄片观察、扫描电镜、物性和地化分析等资料,研究四川盆地西部坳陷雷口坡组雷四3亚段白云岩储层控制因素及孔隙演化特征。结果表明:雷四3亚段白云岩分为晶粒白云岩、颗粒白云岩和藻纹层白云岩三种类型,储集空间分为晶间孔和晶间溶孔、藻间溶孔、窗格孔和溶洞四种类型;白云岩结构对储层物性影响不大;沉积环境决定储层呈薄层叠置形态;浅埋藏期白云岩化作用形成大量晶间孔,为储层发育奠定基础;准同生期和表生期溶蚀形成的孔隙后期易被胶结作用、去白云岩化作用和压实压溶作用破坏;埋藏期溶蚀作用能有效改善前期被破坏的孔隙,提高储层物性,是储层形成的关键。该研究成果为川西坳陷雷口坡组白云岩储层油气勘探提供地质依据。Based on the analysis of scanning electron microscope(SEM)data,porosity-permeability data and geochemical data,investigations were made into the development controlling factors of the third period of the forth Leikoupo formation.Through the core and thin section observation,dolomite can be divided into 3 types:Grain dolomite,particle dolomite and algae lamina dolomite.The reservoir space also can be divided into 4types:Intercrystalline solution pores,dissolved pores between algse,fenestrate and karst cave.Dolomite structure had a little effects on reservoir property and tide flat environment decided the reservoir developed with superimposed thinner beds.Shallow burial dolomization,penecontemporaneous dissolution,supergene dissolution and burial dissolution are conductive to forming pores,but the pores may be destroyed by cementation,removing cloud gasufucation and the filling of autogenetic mineral.Therefore burial dissolution are the key to reservoir formation that effectively improved the physical properties.The results of the study provide geological basis for dolomite reservoir oil and gas exploration of Leikoupo formation in western Sichuan depression.

关 键 词：储层特征 成岩作用 控制因素 雷四3亚段 川西坳陷 

分 类 号：P618.130.21[天文地球—矿床学]