鄂尔多斯东缘石炭二叠系煤层气分布规律及影响地质因素

OCCURRENCE AND AFFECTIVE GEOLOGICAL FACTORS OF COALBED GAS OF THE CARBONIFEROUS-PERMIAN IN THE EASTERN MARGIN OF ORDOS

本文根据煤层气含量，将鄂尔多斯东缘划分为北部低含气量区、中部高含气量区和南部中含气量区。在此基础上，分析了影响煤层气含量的主要地质因素，包括煤层埋藏深度、煤变质程度、地质构造、煤层厚度、顶底板岩性及岩浆活动。最后指出中部高含气量区是最有利的煤层气勘探靶区。

Abstract Based on the contents of coalbed methane,the paper divided the eastern margin of Ordos into three regions: the northern region with low gas content, the middle region with high gas content and the southern region with middle gas content. Then, the major geological factors affecting the content of coalbed methane were discussed, including burial depth of coal seams, metamorphic degree, geological structures, coal thickness, roof and floor lithologies of coal seams and magma movement. Lastly, it is pointed out that the middle region with high gas content is a favourable target for exploration of coalbed methane.