川中地区龙王庙组储层发育模式研究

Study on evolutionary model of Longwangmiao Formation reservoirs in Central Sichuan Basin

针对学者对川中地区龙王庙组储层在成岩作用方面存在争议的问题,以川中地区龙王庙组为研究对象,采用储层地质学、沉积岩石学、层序地层学等学科知识,依据岩心观察、沉积相分析等研究手段对川中地区龙王庙组储层岩石学特征、储层主控因素进行研究,从而建立储层发育模式。研究结果发现,储集岩以砂屑云岩、鲕粒云岩、粉—细晶云岩和花斑状粉晶云岩为主,储层主要受沉积环境和成岩作用控制,颗粒岩是储层形成的物质基础,准同生期岩溶作用形成了早期次生孔隙;准同生期白云化作用使孔隙得以保存;表生岩溶作用形成大量的顺层溶洞;埋藏岩溶作用和构造破裂作用对储层有建设性作用。储层发育模式分为5个阶段,依次为孔隙形成、表生岩溶改造、热液矿物充填、埋藏岩溶—沥青充填和构造破裂。川中地区龙王庙组勘探潜力巨大,了解其储层发育模式对储层的分布预测具有重大意义。

Aimed at the controversy of diagenis for Longwangmiao Formation of Central Sichuan Basin,based on the methods of core ob-servation and sedimentary facies,the authors made a research about Longwangmiao Formation reservoir petrology characteristics and res-ervoir main controlling factors,in order to make a reservoir evolutionary model. It is indicated that the reservoir is mainly composed of arene dolomite,oolitic dolomite,powder-crystal dolomite and ＂piebald＂ powder dolomite. Reservoir is mainly controlled by sedimentary environment and diagenesis. Grain rock is the material basis of forming reservoir. Penecontemporaneous karstification forms the early secondary porosity ; Penecontemporaneous dolomitization makes the pores reserve ; Hypergene karstification forms a quantity of bedding caves;Burial karstification and structural breakdown are construction diagenesis. The reservoir have experience five evolution stages： pores forming, hypergene karstification improving, hydrothermal mineral filling, burial karstification-asphaltic filling and structural break-down. Longwangmiao Formation reservoir in the Central Sichuan Basin shows a giant exploration potential. It is of great significance for reservoir distribution and prediction to research reservoir evolutionary model.