四川盆地中部龙王庙组滩相储层特征及形成机制

发布时间：2018-03-15 02:32

本文选题：龙王庙组　切入点：滩相　出处：《海相油气地质》2016年01期 　论文类型：期刊论文

【摘要】：依据岩心、常规薄片及铸体薄片、物性分析、压汞等资料的研究,四川盆地中部下寒武统龙王庙组滩相储层为发育良好的中低孔、低渗的孔隙型储层及裂缝—孔隙型储层。储集岩主要为砂屑白云岩、鲕粒白云岩与具残余颗粒结构的粉—细晶白云岩,储集空间主要包括粒间溶孔、粒内溶孔、晶间溶孔、铸模孔、残余粒间孔、裂缝及溶洞,孔喉配置关系好。储层形成机制研究表明,滩核和滩翼微相有利于储层发育,滩相储层在沉积早期具有典型的宏观非均质性,这为储层的形成与演化提供了物质基础。同生岩溶作用控制了早期储层的孔隙演化,表生岩溶作用决定了储层分布的基本特征,埋藏岩溶作用有利于先期孔渗层的优化改造。提出滩相储层的演化主要经历三个阶段,其中沉积—同生成岩阶段是早期优质储层形成的关键时期,表生岩溶改造阶段是滩相储层大规模增孔时期,埋藏成岩阶段为滩相储层孔隙调整和稳定时期。
[Abstract]:Based on the study of core, conventional and cast thin sections, physical properties analysis, mercury injection and other data, the beach facies reservoir of the middle and lower Cambrian Longwangmiao formation in Sichuan Basin is a well-developed medium and low porosity. The reservoir rocks are mainly sandstone dolomite, oolitic dolomite and silt-fine grain dolomite with residual grain structure. The reservoir space mainly includes intergranular dissolved pore, intragranular dissolved pore and intergranular dissolved pore. The formation mechanism of the reservoir shows that the formation mechanism of the reservoir is favorable to the development of the reservoir, and the beach facies reservoir has typical macroscopic heterogeneity in the early sedimentary period. This provides a material basis for the formation and evolution of the reservoir. The syngenic karstification controls the pore evolution of the early reservoir, and the supergene karstification determines the basic characteristics of the reservoir distribution. Burial karstification is beneficial to the optimization and reconstruction of the pre-stage pore and permeability layers. It is suggested that the evolution of shoal facies reservoir mainly goes through three stages, among which the deposition-syngenesis stage is the key period for the formation of early high quality reservoirs. The stage of supergene karst reconstruction is the period of large scale pore increasing of beach facies reservoir, and the period of burial diagenesis is the period of pore adjustment and stabilization of beach facies reservoir.
【作者单位】：西南石油大学地球科学与技术学院;中国石油西南油气田公司勘探开发研究院;
【基金】：四川省重点学科建设项目(项目编号:SZD0414)资助
【分类号】：P618.13

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