大庆石油地质与开发2026，Vol.45Issue(3)：30-39,10.DOI:10.19597/J.ISSN.1000-3754.202411046
四川盆地北部阆中地区茅口组二段白云岩储层特征及主控因素
Characteristics and main controlling factors of dolomite reservoirs in the second member of Maokou Formation in Langzhong area in northern Sichuan Basin
摘要
Abstract
The second member of Maokou Formation(Mao2 member)in Sichuan Basin develops beach facies dolo-mite 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 re-sults 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 general-ly Class Ⅱ and Ⅲ fractured-porous reservoirs.Dolomite reservoirs mainly experienced the processes of syngenetic-quasi-syngenetic submarine cementation and dolomitization,quasi-syngenetic exposure and dissolution,dolomitiza-tion 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 ex-posure 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 middle-late 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
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Key words
beach facies dolomite/reservoir characteristics/diagenetic sequences/main controlling factors/the second member of Maokou Formation/Langzhong area/northern Sichuan Basin分类
能源科技引用本文复制引用
黎虹玮,李春阳,石国山,王信,蒋能春..四川盆地北部阆中地区茅口组二段白云岩储层特征及主控因素[J].大庆石油地质与开发,2026,45(3):30-39,10.基金项目
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). （KJ-792-2403）
