古交矿区山西组沉积环境及其对煤层气富集的影响

发布时间：2018-06-15 07:30

本文选题：沉积环境 + 层序地层　；参考：《中国矿业大学》2015年硕士论文

【摘要】：论文以沉积(岩石)学、层序地层学、瓦斯与煤层气地质学等学科的理论和方法为指导,通过对古交矿区GS-26、D13-4、GS-3钻井岩芯的观察和室内试验研究、结合100余口钻井及矿井瓦斯含量等相关资料的综合研究,对研究区山西组沉积环境、层序地层学、岩相古地理及沉积环境与煤层气富集的关系等方面进行研究。基于相标志研究,认为矿区山西组主要为三角洲沉积,包括三角洲平原、三角洲前缘2种沉积亚相以及8种沉积微相,并总结了其特征。将山西组分成3个三级层序、8个体系域,通过研究区钻孔的层序对比,建立了全区层序地层格架。在层序地层格架内探讨了山西组沉积格局及演化特征,总结了山西组沉积模式。以研究区2#煤瓦斯含量为例,探讨了沉积环境等因素与煤层气的富集的关系。沉积环境对煤层气富集影响,主要体现在煤层厚度、顶底板泥岩厚度以及煤质等方面,同时,探讨了构造演化、褶曲发育部位、断层的发育特征、煤层埋深以及水文地质条件对煤层气富集的影响。
[Abstract]:Guided by the theories and methods of sedimentary (lithology), sequence stratigraphy, gas and coalbed methane geology, the paper studies the core of GS-26D13-4 GS-3 drilling in Gujiao mining area. Combined with the comprehensive study of more than 100 drilling wells and mine gas content, the sedimentary environment, sequence stratigraphy, lithofacies paleogeography and the relationship between sedimentary environment and coalbed methane enrichment of Shanxi formation in the study area are studied. Based on the study of facies markers, it is considered that the Shanxi formation in the mining area is mainly delta sedimentary, including delta plain, delta front two sedimentary subfacies and 8 sedimentary microfacies, and its characteristics are summarized. Shanxi formation is divided into three third-order sequences and eight system tracts. The sequence stratigraphic framework of the whole area is established by the sequence correlation of boreholes in the study area. The sedimentary pattern and evolution characteristics of Shanxi formation are discussed in sequence stratigraphic framework, and the sedimentary model of Shanxi formation is summarized. Taking coal gas content in study area as an example, the relationship between sedimentary environment and coalbed methane enrichment is discussed. The influence of sedimentary environment on coalbed methane enrichment is mainly reflected in coal seam thickness, top and floor mudstone thickness and coal quality. At the same time, the structural evolution, fold development location and fault development characteristics are discussed. The influence of coal seam depth and hydrogeological conditions on coalbed methane enrichment.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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