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通过考察川中地区8条优选的野外地质剖面,搞清雷口坡组顶面岩性特征、溶蚀孔缝发育情况、风化壳发育层位及发育厚度等。地层分析表明:川中雷口坡组地面露头岩性包括白云岩、溶塌角砾岩以及石灰岩;溶蚀孔洞发育,以半充填或未充填为主;在65m左右的岩溶作用深度范围内,岩溶作用改善了地层的岩性、孔隙空间、储渗性能,可形成良好的古风化壳储层。该认识对研究深埋于地下的雷口坡组顶部风化壳储层具有重要的借鉴意义,可为川中地区雷口坡组风化壳储层进一步的勘探开发提供地质依据。
By examining eight preferred field geologic profiles in the central Sichuan Basin, the top lithology characteristics, the development of dissolution pores, the developmental horizon and the thickness of weathering crust in the Leikoupo Formation are investigated. The stratigraphic analysis shows that the surface outcrops of the Leikoupo Formation in central Sichuan include dolomite, rupture breccias and limestone; the dissolution pores are developed mainly in the semi-filling or non-filling; within the depth of karst of 65m, the karstification Improve the lithology, pore space, reservoir permeability, can form a good ancient weathering crust reservoir. This knowledge is of great significance to the study of the weathered crust reservoir at the top of the Leikoupo Formation buried deep in the ground and provides a geological basis for the further exploration and development of the weathered crust reservoir in the area of the Leikoupo Formation in central Sichuan.