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①通过对川西坳陷中段新场气田及其它地区中深层上沙溪庙组 (J2 s)气层储集空间类型的研究 ,提出了原生孔隙是中深层重要的一种储集空间类型 ;②将岩石学、储层有机地球化学的分析与川西坳陷油气演化历史、构造发展史相结合 ,论述了次生溶孔形成的化学机理、发生时期和原生残留粒间孔隙的保存机制 ;③明确指出原生孔隙是燕山期烃类发生运移聚集的证据 ,油气具早期富集特征 ,而次生溶孔是燕山中晚期以来与运移、致密、超压同步形成的产物 ;④根据成岩改造的次生溶孔与残留原生孔隙在构造上分布的极不均一性和钻探实际资料 ,确认复合圈闭是中深层气藏的主要圈闭类型 ;⑤根据中深层储集岩特征与成藏史相结合进行的综合分析 ,提出川西坳陷中深层领域的勘探方向应该是燕山期古构造带上形成的复合圈闭
① By studying the reservoir space types of the Shaximian Formation (J2 s) in the Xinchang gas field in the middle segment of the western Sichuan depression and other areas, it is suggested that the primary porosity is an important reservoir space type in the middle and deep layers. ② Combining the analysis of petrology and reservoir organic geochemistry with hydrocarbon evolution history and tectonic history in western Sichuan Depression, the chemical mechanism of secondary pore formation, the occurrence period and the preservation mechanism of primary residual intergranular porosity were discussed. It is pointed out that primary pores are evidences of migration and accumulation of hydrocarbons in Yanshan period, with early enrichment of oil and gas, and secondary dissolution pores are formed synchronously with migration, densification and overpressure since the late Yanshan. ④ According to diagenetic alteration The secondary heterogeneity of secondary dissolved pores and residual primary pores distribution in the structure and actual data of drilling confirmed that the composite traps are the main trap types of mid-deep gas reservoirs; (5) Based on the characteristics of middle-deep reservoir rocks and the history of reservoir formation Combined with the comprehensive analysis, it is proposed that the exploration direction in the middle-deep area of the western Sichuan depression should be the composite traps formed on the Yanshanian palaeotectonic belt