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四川盆地中部地区下寒武统龙王庙组是油气勘探研究的重点层位。根据钻井资料、测井数据、岩心观察、普通薄片、铸体薄片、阴极发光、碳氧稳定同位素和主元素等分析,对龙王庙组储层成岩作用进行了研究,结果表明为颗粒白云岩和晶粒白云岩是龙王庙组主要的储集岩性,成岩作用主要有建设性、破坏性和保持性。建设性成岩作用主要包括溶蚀、破裂和烃类(有机酸)充注作用,破坏性成岩作用主要包括压实和压溶作用,保持性成岩作用主要包括胶结、白云石化和泥晶化作用。揭示了颗粒滩微相是龙王庙组优质碳酸盐岩储层发育的基础条件,海水白云石化、准同生期淡水溶蚀和烃类(有机酸)充注作用是优质储层形成的关键因素。
The Lower Cambrian Longwangmiao Formation in the central Sichuan Basin is the key reservoir for oil and gas exploration. The diagenesis of Longwangmiao Formation was studied based on well data, well logging data, core observation, normal thin slab, cast thin slab, cathodoluminescence, carbon and oxygen stable isotopes and main elements. The results show that the dolomite and dolomite The grain dolomite is the main reservoir lithology of the Longwangmiao Formation, and diagenesis is mainly constructive, destructive and retentive. Constructive diagenesis mainly consists of dissolution, fracturing and hydrocarbon (organic acid) charging. Destructive diagenesis mainly consists of compaction and pressure-dissolving, while maintaining diagenesis mainly includes cementation, dolomitization and mud-crystallization. It is revealed that the grain-matan microfacies are the basic conditions for the development of fine-quality carbonate reservoirs in the Longwangmiao Formation. Marine dolomitization, quasi-contemporaneous fresh water erosion and hydrocarbon (organic acid) charging are the key factors for the formation of high-quality reservoirs .