【摘要】 泸州地区茅口组灰岩岩溶分为三种类型:层间古岩溶、阳顶古岩溶、缝洞系岩溶。后者是在层间、阳顶古岩溶及裂缝分布区基础上经过地下水的多期改造形成的,它是现今油气储渗的有效空间及运移通道,控制了该区天然气分布。岩溶作用的不均一性及茅口灰岩的致密性,使茅口灰岩纵向上形成多个储集层段,横向发育多个裂缝系统,气水分布复杂,无统一的气水界面。圈闭内有天然气产出,圈闭外也有良好的天然气显示。更多还原

【Abstract】 The Karst system in Maokou formation (P) is classified into three different types: intraformation paleokarst, Yangxin surface paleokarst, and fissure-cavern system karst. The last type is formed in intra-formation paleokarst, Yangxin surface paleokarst and fracture area, and during being transformed many times by underwater. It provides effective pore space for oil/gas accumulation and migration pathway, and controls the gas-water distribution in Maokou formation, in the area under study. The inhomogeneous development of the karst leads to forming a lot of vertical reservoir bebs and lots of lateral fissure-cavern systems. The relationship between gas and Water is complex, so there is no common watergas contact in the area. There is natural gas producing in the trap, and also good gas indication out of the trap.更多还原