沁水盆地煤系气源岩地球化学特征与生气评价  

The Geochemical Characteristics and Gas Generation Evaluation of Coal Measure Gas Source Rock in Qinshui Basin

作　　者：李贤庆[1] 王元[1] 董泽亮[1] 祁帅[1] 黄孝波 文志刚[3] 何文祥[3] 刘建军[4] 钱铮[4] 

机构地区：[1]煤炭资源与安全开采国家重点实验室(中国矿业大学(北京))中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]江西省煤田地质勘察研究院,江西南昌330001 [3]长江大学地球环境与水资源学院,湖北武汉430100 [4]中石油华北油田分公司勘探开发研究院,河北任丘0625523

出　　处：《长江大学学报（自科版）（中旬）》2015年第5期1-8,共8页Journal of Yangtze University(Nature Science Edition)

基　　金：国家"十二五"油气田及煤层气科技重大专项(2011ZX05033-004);中央高校基本科研业务费专项(2010YM01);煤炭资源与安全开采国家重点实验室自主科研课题(SKLCRSM10B04)

摘　　要：沁水盆地是我国首个已成功商业化开发煤层气的含煤盆地,广泛分布石炭-二叠系煤系气源岩。在系统研究沁水盆地石炭-二叠系太原组(C2t)和山西组(P1s)煤系气源岩的有机质丰度、类型、成熟度等地球化学特征的基础上,对P1s煤岩和煤系泥岩进行了生气评价。结果表明:沁水盆地C2t和P1s煤系气源岩有机质类型主要为Ⅲ型;具有高总有机碳质量分数、低氯仿沥青"A"质量分数和总烃含量、低热解生烃潜量和氢指数的特征;煤系气源岩有机质成熟度高,大多处于高-过成熟阶段,镜质体反射率(Ro)变化大,总体上呈现"盆地南部(阳城-晋城Ro>3.0%)与东北部(阳泉Ro>2.5%)高、盆地东翼(Ro<2.0%)与西翼(Ro<1.5%)低"的特点。P1s煤岩以较好-好的气源岩为主,主要分布在阳城-晋城、太原西山、寿阳-阳泉、安泽-沁水、沁源一带、左权-和顺、榆次-平遥等地;P1s煤系泥岩以较差-较好的气源岩为主,但在太原西山、阳城-晋城、左权-和顺和榆次-平遥等地可达到较好-好的气源岩。Qinshui Basin was the coal-bearing basin that coalbed methane has been first successfully and commercially developed in China,where gas source rocks of the Permo-Carboniferous coal measure were widely distributed.The geochemical characteristics organic matter abundance,type,maturity,etc,of the coal measure gas source rock from the Permo-Carboniferous Taiyuan and Shanxi Formations in Qinshui Basin were systemically studied.Gas generation potential of coal and coal-bearing mudstone of the Shanxi Formation was also evaluated.The results show that coal measure gas source rocks of the Permo-Carboniferous Taiyuan and Shanxi Formations mainly belongs to TypeⅢ of organic matter,and is featured by high organic carbon content,low bitumen and total hydrocarbon,low pyrolysis hydrocarbon potential and hydrogen index.The gas source rock in the coal measure has high maturity of organic matter,and the most of it is at high-over mature stage.The vitrinite reflectance Ro value of the coal measure gas source rock is varied widely.Generally,it has the characteristics of high Ro in the southern(Ro>3.0% in Yangcheng-Jincheng Area)and in the northeastern(Ro >2.5%in Yangquan coal measure),low Ro in the eastern(Ro<2.0%)and western part(Ro<1.5%)of the basin.In Qinshui Basin,the mudstones in Shanxi Formation in general belong to the better-good gas source rocks,which are mainly distributed in Yangcheng-Jincheng,Taiyuan Xishan,Shouyang-Yangquan,Anze-Qinshui, Qinyuan,Zuoquan-Heshun,and Yuci-Pingyao Areas.The Shanxi Formation coal-bearing mudstones mainly belong to the relative poor-better gas source rocks,can be better-good gas source rocks in Xishan,Yangcheng-Jincheng,Zhuoquan-Heshun,and YunciPingyao Areas of Taiyuan Region.

关 键 词：沁水盆地 石炭-二叠系 煤系气源岩 地球化学特征 生气评价 

分 类 号：TE122.1[石油与天然气工程—油气勘探]