西山区块煤储层含气性及甲烷碳同位素分布特征  

Distribution characteristic of gas content of coal reservoir and its methane carbon isotope in the Xishan block

作　　者：黄平[1] 孟召平[1,2] 陈慧诚[1] 王俊耀[1] HUANG Ping;HUANG Ping;CHEN Huicheng;WANG Junyao(College of Geosciences and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;State Key Laboratory of Coal and CBM Co-mining, Shanxi Jincheng Anthracite Mining Group,Jincheng 048000, China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]山西晋城无烟煤矿业集团有限责任公司煤与煤层气共采国家重点实验室,山西晋城048000

出　　处：《煤田地质与勘探》2017年第1期75-79,共5页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41372163);2014年度山西省煤基重点科技攻关项目(MQ2014-01);山西省煤层气联合研究基金资助项目(2014012001);中国矿业大学(北京)大学生创新训练项目(C201602037)~~

摘　　要：煤层含气性是决定煤层气勘探开发的重要参数,煤层气甲烷碳同位素能有效反映煤层气的赋存条件。根据煤层气井实测含气量数据,剖析了山西沁水盆地煤层含气量分布特征,建立了煤层含气量与煤层埋深、地质构造之间的相关关系和模型,探讨了煤层甲烷碳同位素分布特征及其对含气性分布的指示作用。研究表明:西山区块2号煤层平均含气量6.87 m^3/t,8号煤层平均含气量8.4 m^3/t,9号煤层平均含气量7.6 m3/t,煤层含气量主要受煤层埋深和构造形态的影响。研究区8号煤层甲烷碳同位素为–65.33‰~–40.94‰,平均–45.88‰,煤层含气量与甲烷碳同位素之间成正相关关系,随着含气量的增加,甲烷碳同位素也逐渐变重。煤层甲烷碳同位素主要受控于煤层气解吸–扩散–运移效应和地下水动力作用等。The gas-bearing properties is an important parameter to determine the exploration and development of coalbedmethane(CBM).The methane carbon isotope(δ13C1)can reflect the reservoir condition of CBM effectively.Based on thedate of measured gas content from CBM well,the characteristic of gas content distribution in coalbed was analyzed,andthe correlations and models of gas content,the burial depth of coalbed,geological structure were built.The characteristicofδ13C1distribution was discussed and it had an indicative function to the distribution of gas-bearing properties.Findingsshow that,the gas content in the Xishan block is an average of6.87m3/t,8.4m3/t,9.6m3/t in the No.2,8and9coalbedrespectively.The gas content was mainly influenced by burial depth of coalbed and structural configuration.Theδ13C1value of the No.8in the study area ranges from–65.33‰to–40.94‰and its average is–45.88‰,and there was a positivecorrelation between coalbed gas content andδ13C1.δ13C1generally is getting heavy with increase of gas content.δ13C1is mainly controlled by the coalbed methane desorption-diffusion-transport effect and hydrodynamic condition.

关 键 词：西山区块 含气性 甲烷碳同位素(δ13C1) 影响因素 

分 类 号：TD713[矿业工程—矿井通风与安全]