高校地质学报2016，Vol.22Issue(2)：378-384,7.DOI:10.16108/j.issn1006-7493.2015095
鄂尔多斯盆地东南缘上古生界煤储层非均质性及其意义
Heterogeneity and Significance of Coal Reservoir of Upper Paleozoic in Southeast Margin of Ordos Basin
摘要
Abstract
A number of high-yield wells has emerged in the southeast margin of Ordos Basin, which showed the potential of the Upper Paleozoic exploration and development of coalbed methane resources. However, owning to the coal reservoir heterogeneity, great differences of individual gas wells were observed in adjacent block groups and sometime even in the same block. Therefore, a deeper understanding of reservoir heterogeneity is needed for efficient exploration and development. Systematic studies were conducted on coal reservoir in terms of rock characteristics, physical characteristics, adsorption characteristics, and gas characteristics. The results showed that the 3, 5, 11 coal seam, with stable distribution and large thickness, is the main target for exploration and development of coalbed methane. Half-bright coal seam and semi-dark coal with high vitrinite content has better fracture resistance, whereas a low ash-lean coal was also found, with anthracite and a small amount of high grade coal identified in some sections. We found that coal rock porosity and permeability are low, showing strong adsorption, short adsorption time and the higher desorption rate. This is conducive to CBM output, however, coal measures of reservoir stimulation need to be strengthened. The average gas content is about 11 m3/ t or more, with a maximum of 19.73 m3/t, and the average gas saturation is above 61%, indicating a greater resource and a high density of formation energy, in favor of CBM desorption output.关键词
煤层气/煤储层/物性/含气量/上古生界/鄂尔多斯盆地东南缘Key words
coalbed methane/coal reservoir/properties/gas content/Upper Paleozoic/southeast margin of Ordos Basin分类
地质学引用本文复制引用
伊伟,熊先钺,庞斌,王伟,林伟,何春连,车延前,冯延青..鄂尔多斯盆地东南缘上古生界煤储层非均质性及其意义[J].高校地质学报,2016,22(2):378-384,7.基金项目
国家科技重大专项“煤层气井气、水流动特征和变化规律研究”（2011ZX05038-002）；中国石油天然气股份有限公司重大专项课题五“煤层气富集规律研究及有利区块预测评价”（2013E-2205）联合资助 （）
