鄂尔多斯盆地北部上古生界煤成气形成的地质条件

Geological Conditions Forming Coal—Formed Gas in Upper Paleozoic in the North Part of Erduosi Basin

本文在对气源、有机质热演化及气藏形成条件等问题论证的基础上,认为鄂尔多斯盆地北部是勘探煤成气的有利地区。气源层主要为石炭、二叠系煤系;储、盖层主要为二叠系石盒子组。区内圈闭类型较多,应以背斜为勘探重点。文章还对四个有利区分别进行了评价。

Based on demonstration of the gas source,the thermal evoluation of organic matters and the conditions of forming gas reservoir etc.,the authors consider that the north part in Erduosi basin is the favourable region for expiorating the coal-formed gas.Source beds are mainly thy coal series in Carboniferous and Permian,reservoirs and cap rocks are mainly the Shih- ezi formation of Permian.There are many types of trap in this region,but the key point of exploration should be the anticlines.Four favourable areas are respectively evaluated in this paper also.