黎虹玮,李春阳,石国山,王信,蒋能春
LI Hongwei,LI Chunyang,SHI Guoshan,WANG Xin,JIANG Nengchun

• 1:中国石化西南油气分公司勘探开发研究院

摘要(Abstract)：

四川盆地茅口组二段（茅二段）滩相云岩储层发育，且已获得多口高产工业气流井，但阆中地区该层段勘探程度较低。为了明确储层发育主控因素及优质储层分布情况，通过岩心、薄片观察及地球化学分析，对储层分布特征、成岩作用、孔隙演化过程及储层发育主控因素进行分析。结果表明：茅二段主要发育细-中晶云岩储层，储集空间以白云石晶间（溶）孔、准同生期岩溶系统残余孔隙为主，整体为Ⅱ、Ⅲ类裂缝-孔隙型储层；白云岩储层主要经历了同生期—准同生期海底胶结与白云石化作用、准同生期暴露溶蚀作用、浅埋藏期白云石化作用以及中深埋藏期构造破裂、扩溶作用与胶结充填作用；高能颗粒滩叠加准同生期暴露溶蚀作用是储层发育的关键；成岩早期规模白云石化作用有利于孔隙的保存，成岩中-晚期封闭体系下的埋藏溶蚀和构造破裂作用的增储能力有限。研究成果可有效支撑阆中地区茅二段下一步勘探目标优选。
The second member of Maokou Formation(Mao2 member) in Sichuan Basin develops beach facies dolomite reservoirs,and several gas wells get high commercial production.However,exploration level of this interval is low in Langzhong area.Core and thin section observation and geochemical analysis are performed to study reservoirs distribution characteristics,diagenesis,pores evolution process and main controlling factors of reservoirs.The results show that Mao2 member mainly develops fine-medium crystalline dolomite reservoirs,and reservoir spaces are mainly dolomite intergranular(dissolved) pores and residual pores in quasi-syngenetic karst system,being generally Class Ⅱ and Ⅲ fractured-porous reservoirs.Dolomite reservoirs mainly experienced the processes of syngeneticquasi-syngenetic submarine cementation and dolomitization,quasi-syngenetic exposure and dissolution,dolomitization in shallow burial period,and structural fracturing,expansion and cementation filling in medium-deep burial period.The key factor to reservoir development is high-energy grain beach superimposed with quasi-syngenetic exposure and dissolution.Large-scale dolomitization in early stage of diagenesis is conducive to pores preservation,while capability to increase storage through burial dissolution and structural fracturing in closed system in middlelate stage of diagenesis is limited.The research provides effective support for next-step optimization of exploration targets in Mao2 member of Langzhong area.

关键词(KeyWords)： 滩相云岩;储层特征;成岩作用序列;主控因素;茅口组二段;阆中地区;四川盆地北部
beach facies dolomite;reservoir characteristics;diagenetic sequences;main controlling factors;the second member of Maokou Formation;Langzhong area;northern Sichuan Basin

Abstract:

Keywords:

基金项目(Foundation): 中国石油化工股份有限公司西南油气分公司科技攻关项目“川北地区断裂输导体系与成藏关系研究”（KJ-792-2403）

作者(Author): 黎虹玮,李春阳,石国山,王信,蒋能春
LI Hongwei,LI Chunyang,SHI Guoshan,WANG Xin,JIANG Nengchun

DOI: 10.19597/J.ISSN.1000-3754.202411046

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