机构地区:[1]宁夏回族自治区矿产地质调查院(自治区矿产地质研究所),宁夏银川750021
出 处:《煤炭与化工》2023年第11期51-59,113,共10页Coal and Chemical Industry
基 金:宁夏自然科学基金项目(2021AAC03446);宁夏回族自治区重点研发计划(重点)项目(2020BFG02003)。
摘 要:煤层气是重要的非常规地质资源,鄂尔多斯盆地西缘拥有丰富的煤层气资源,其中以韦州矿区中南部的韦三井田为典型代表。该井田位于鄂尔多斯西缘青龙山-云雾山南北向褶皱冲断带,受东西方向的挤压为主应力的影响,整体赋存于一向斜构造之内。井田因受区域沉积变质作用的影响而广泛发育煤层,含煤地层为石炭-二叠系太原组和二叠系山西组。本文提供了太原组和山西组各煤层的等值线图(包括累计厚度、煤灰分、瓦斯含量和煤层气甲烷含量),详细分析了该井田成藏规律、煤层化学性质和煤层气起源特征,论述了该井田的勘探开发潜力。太原组和山西组含煤地层均为一套厚度较大的海陆交互相含煤碎屑沉积,其成煤环境为近海的三角洲平原沼泽和海湾泻湖沼泽。其中,太原组可采煤层平均厚度13.21 m,可采含煤系数2.41%,大部分可采煤层为12、15、17、20号煤,局部可开采煤为10、14号煤;山西组含煤地层平均厚度125 m,编号煤层数4层,平均煤层累积厚度8.92 m,含煤系数7.13%,可采煤层4层为别为0、2、3、4号煤。韦三井田各可采煤层浮煤灰分产率平均为6.30%~15.04%,总平均值为9.06%,脱灰率平均为60.81%~70.11%;浮煤回收率平均为9.53%~37.52%,总平均值为27.93%。煤层瓦斯成份大部分为N_(2),成分7.44%~98.99%;CH4成分次之,占0~87.12%;CO_(2)成分占0.50%~12.92%;重烃成分低于1%。山西组煤层气赋存相对较少,而太原组0、1、2、3、4、10号煤为贫气区,12、15、17、20号煤大部分地段为低气区,局部地段为中气区。Coalbed methane was an important unconventional geological resource.There were abundant coalbed methane resources in the western margin of Ordos Basin,among which Weisan mine field in the central and southern part of Weizhou mining area was a typical representative.The mine field was located in the north-south fold thrust belt of Qinglongshan-Yunwushan in the western margin of Ordos.It was affected by the compression in the east-west direction as the main stress,and was generally located in the synclinal structure.Coal seams were widely developed in the mine field due to the influence of regional sedimentary metamorphism.The coal-bearing strata were Carboniferous-Permian Taiyuan Formation and Permian Shanxi Formation.In this paper,the contour maps of each coal seam of Taiyuan Formation and Shanxi Formation(including cumulative thickness,coal ash content,gas content and coalbed methane content)were provided.The accumulation law,coal seam chemical properties and coalbed methane origin characteristics of the well field were analyzed in detail,and the exploration and development potential of the well field was discussed.The coal-bearing strata of Taiyuan Formation and Shanxi Formation were a set of thick marine-continental alternating coal-bearing clastic deposits,and their coal-forming environments were offshore delta plain swamps and bay lagoon swamps.Among them,the average thickness of the mineable coal seam of the Taiyuan Formation was 13.21 m,the mineable coal content coefficient was 2.41%,most of the mineable coal seams were No.12,No.15,No.17 and No.20 coal seams,and the local mineable coal seams were No.10 and No.14 coal seams;the average thickness of the coal-bearing strata in the Shanxi Formation was 125 m,the numbered coal seam was 4 layers,the average cumulative thickness of the coal seam was 8.92 m,the coal-bearing coefficient was 7.13%,and the 4 coal seams that could be mined were No.0,No.2,No.3 and No.4 coal seams.The average yield of float coal ash in each mineable coal seam of Weisan mine field was 6.
分 类 号:TD163[矿业工程—矿山地质测量]
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