煤田地质与勘探Issue(5)：17-24,8.DOI:10.3969/j.issn.1001-1986.2014.05.005
鄂尔多斯盆地侏罗系低煤阶煤层气系统演化
Evolution of Jurassic low rank coal CBM system in Ordos basin
摘要
Abstract
coalbed methane of low rank coal as an unconventional gas resource, has good development prospect. There are abundant CBM resources of low rank coal in China. It is of important significance for the study of CBM accumulation and CBM development to analyze the evaluation of CBM system of low rank coal. Generally, CBM is compositionally dominated by methane withδ13C1 values ranging approximately from -33.1‰ ~ -80‰,CH4dDfrom -235‰ ~ -268‰. In Ordos basin, there are mainly two types of CBM reservoir: mixed reservoir of secondary biogenetic gas and reservoir of thermogenetic gas. Based on the analyses of CBM components, tectonic thermal event, sedimentary and burial history of Jurassic coal-bearing strata, combined with metamorphism and gas generation process of coals, Jurassic CBM system in Ordos basin is subdivided into four evolutionary stages as follows: shallowly-buried peat and early biogenic gas stage, deeply buried coal seams and thermogenic gas stage, stage of coal measures lifting and escape as well as loss of adsorbed gas, stage of local subsidence of coal measures and compliment of secondary biogenetic gas. Among them, the stage of deep burial and thermogenetic gas, the stage of local subsidence and secondary biogenetic gas are major CBM-forming stages. Supplement of secondary biogenic gas is an important gas source for successful CBM development of Jurassic low rank coal in Ordos basin. The CBM reservoirs of Jurassic in Ordos basin belongs to the typical monoclinic mode of gas enrichment and reservoir formation.关键词
低煤阶/煤层气系统/侏罗系/次生生物气/演化阶段/鄂尔多斯盆地Key words
low rank/CBM system/Jurassic/secondary biogenic gas/evolution stages/Ordos basin分类
天文与地球科学引用本文复制引用
晋香兰,张泓..鄂尔多斯盆地侏罗系低煤阶煤层气系统演化[J].煤田地质与勘探,2014,(5):17-24,8.基金项目
国家科技重大专项课题（2011ZX05033-002）；国家自然科学基金重点项目 （）
