作　　者： ;

机构地区： 西北大学地质学系地质系

出　　处： 《石油与天然气地质》 1998年第4期302-306,共5页

摘　　要： 沁水盆地具备形成古生界向斜型水封气藏的基本条件：（１）复式向斜型盆地结构；（２）复向斜主部充足的气源（３４５８６×１０８ｍ３）及其与盆地构造的良好时空配置；（３）复向斜边缘常规储层沿下倾方向渐变为低孔渗致密储层；（４）复向斜边翼水动力封堵与区域盖层联合构成的有效封存与圈闭条件。由此预测盆地腹部向斜轴部附近，上、下古生界当分别构成水动力圈闭条件下的两大天然气赋存系统。 Abstract Qinshui Basin is considered to have the basic condition of forming of hydrodynamic sealed Paleozoic sycnlinal gas pools.The formation of hydrosealed gas pools is the result of the synthetic interaction of 4 essential geological factors:1,a synclinorium structure of the basin;2,abundant gas resources(3458 6×10 8 m 3)in the synclinal center matched well with the structural conditions in time space of the basin;3,low porosity low permeability tight reservoir rock in downdip structural location;4,updip water block and fine regional caprocks.It is prodicted that the occurrence of the Paleozoic natural gas in Qinshui Basin is in two gas systems,i e the natural gas system of the Lower Paleozoic and the natural gas system of the Upper Paleozoic.

关 键 词： 盆地 复向斜构造 水动力圈闭 气藏形成

领　　域： [天文地球] [天文地球]