川弥87井二叠系茅口组的成岩后生变化及其对储集性能的影响

四川盆地二叠系茅口组是主要的天然气产层,控制储层性能的因素较多且复杂。本文通过对川弥87井成岩后生作用的研究,认识该组气层的储集规律。 通过岩芯和簿片研究认识到,胶结、压实、压溶、破坏性重结晶、硅化等作用对储层起破坏性作用;溶解、白云石化、后期重结晶等作用及构造裂隙的形成对储层起建设性作用。作者建议,在研究区茅口组地层勘探过程中,应把注意力放在孔隙—裂隙型储层气藏上。

DIAGENETIC DEUTEROGENIC CHANGE IN MAOKOU FORMATION OF PERMIAN OF WELL MILE NO.87 IN DAZU COUNTY,SICHUAN,AND ITS INFLUENCE ON RESERVOIR CHARACTERISTICS

In Maokou formation of Permian exist the main gas reservoirs in Sichuan basin. The factors controlling the reservoir characteristics are many and complex. In this paper, we mainly discuss the diagenesis of well Mile No. 87 in Dazu county in order to recognize the accumulation laws of gas reservoirs.By studying the cores and thin sections, we know that the main destructive factors for reservoirs are cementation, compaction, pressure solution, early stage destructive recrystal-lization and silicification; and that the constructive factors for reservoirs are solubilization, dolomization, late stage recrystallization and structure fractures.Author suggests that in the exploration in Maokou formation more attention be paid to the pore-fracture pattern gas reservoirs.