作　　者： ; ; ; ;

机构地区： 中国矿业大学资源与地球科学学院

出　　处： 《高校地质学报》 2012年第3期465-473,共9页

摘　　要： 鄂尔多斯盆地东部目前的煤层气开发深度浅于1200m,丰富的深部煤层气资源有待勘探开发。鉴于此,本文分析了区内深部煤层赋存特征、热演化程度、煤层含气量及其分布规律。认为上古生界埋深的总体分布格局与两个向西凸出浅埋带的叠加,可能导致煤层含气性和渗透性区域分布格局的进一步复杂化。发现上古生界煤阶区域分布格局与煤层埋深类似,指示深成变质作用对区域煤阶分布起着主要控制作用。预测了深部煤层含气量的分布格局,认为煤层埋藏一旦超过临界深度时煤层含气量随深度的加大反而有所降低。建立了自生自储、内生外储两类煤成气藏模式,认为吸附型煤层气藏与游离型煤成气藏的共生为合采提供了丰厚的资源条件。 Burial depth of the developing cnalbed methane （CBM） fields in the eastern Ordos Basin is less than 1200 m. Abundant deep CBM resnurces need In be exploraled and developed. For this reason, occurrence, coal-rank, CBM enntenl and dislribmion of deep coal seams in the eastern Ordos Basin were analyzed. It was suggesled that the reginnal distribution pattern of the gas-bearing characteristics and permeability of depth eoal seams might be further enmplicated due to the overlay of two westward protruding shallow zone to overall depth pallern of Ihe Upper Paleozoie. It was found thai the regional coal-rank oceurrence of the 1,ate Palenzoie coal seams is similar lo thai of coal seam depth, which indicaies a major control of deep burial metamorphism to the coal rank selling. Occurrence of deep CBM content was predicted, h was suggested that the content mighl decrease wilh the increase of the depth once the burial deplh of coal seam exceeds a critieal depth. Two types of coal-derived gas reservoir models were set up including self-generation plus self-storage, endogenous generation plus exogenelic stnrage. It was suggested thal the paragenesis of both adsorption CBM and free enal-derived gas reservoirs provides a viable resource for the gas combined development.

关 键 词： 鄂尔多斯盆地 深部煤层气 赋存特征 成藏模式

领　　域： [天文地球] [天文地球]