沁水盆地安泽地区煤层气富集主控地质因素  

Factors affecting coalbed methane enrichment in Anze area,southeastern Qinshui basin

作　　者：侯月华 姚艳斌[1] 钟林华[2] 陈龙伟 陈杨[4] 黄赛鹏 

机构地区：[1]中国地质大学(北京)煤层气国家工程中心煤储层实验室能源学院,北京100083 [2]兖州煤业股份有限公司,山东济宁273500 [3]中国石油华北油田公司,河北任丘062552 [4]中国地质图书馆,北京100083

出　　处：《煤田地质与勘探》2017年第6期60-65,71,共7页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41472137);全国优秀博士学位论文作者专著资金(201253);山西省煤基重点科技攻关项目(MQ2014-01)~~

摘　　要：通过对沁水盆地安泽区块煤层气地质条件和储层条件的深入分析,探讨了该区煤层气的富集规律及主要影响因素。研究发现,煤的岩石学特征、构造、顶底板岩性是影响煤层气富集的主要因素。总体上,安泽区块煤储层含气量受煤阶影响,表现为:煤的变质程度越高,吸附能力整体增强,含气量增大。局部区域,煤层气含量受煤层埋深、断层、褶皱及煤层顶底板岩性等综合因素的影响。在构造平缓带,煤层气含量随埋深增大而增大;在构造活动带,正断层上升盘含气量明显低于下降盘含气量,断层对煤层气的逸散作用明显。此外,泥岩顶底板封盖较砂岩顶底板封盖能力强。Through deepened analysis of CBM geological conditions and reservoir conditions in Anze block, the CBM enrichment law and its major influencing factors were discussed. The results show that coal petrology and structure of coal seam, as well as lithological characteristics of roof and floor rocks of coal seam are three key factors influencing gas content. Generally, gas content was manly controlled by coal rank. The higher coal metamorphic degree resulted in higher adsorption capacity of coal, and thus the greater gas content. Locally, gas content is also influenced by buried depth of coal, faults, folds and lithology of seam roof and floor. In structurally gentle zone, CBM content increased with burial depth. In faulting zone, gas content in the upthrow side of normal fault was obviously lower than that in the downthrown side. CBM dispersed obviously through faults. Mudstone and shale roof and floor of coal seam show better sealing capacity than that of sandstone roof and floor.

关 键 词：煤层气富集 煤阶 断层 褶皱 顶底板岩性 安泽区块 

分 类 号：TE122[石油与天然气工程—油气勘探]