四川盆地龙岗地区中三叠统雷口坡组顶部雷四3段发育一套风化壳岩溶型白云岩储层.储层似层状成规模分布.古岩溶作用以表生裸露期风化壳岩溶作用为主,受古地质背景和风化壳岩性组合影响,古岩溶特征主要表现为:溶蚀时间较短,溶蚀作用较弱,充填作用及膏溶作用较强.在研究区内风化壳岩溶作用是影响储层发育的关键因素,它对储层既有建设性作用又有破坏性作用.

A set of layer-liked karstic dolostone reservoir asa weathering crust develops at the top bed of Middle Triassic Leikoupo4 Member (Lei 43) in Longgang area, Sichuan Basin. The epidiagenetic weathering crust palaeokarst is dominant in the palaeokarstication. By the affection of the palaeogeologic setting and lithologic association, the palaeokarst is characteristic of the short-time and weak dissolution, and strong filling and anhydrite decomposition. It is shown that the palaeokarstification of weathering crust is the key factor in development of the reservoir, which plays actions of not only construction but also destruction for the reservoir.