准南煤田玛纳斯河-三屯河一带煤层气储层物性特征及有利煤层优选  

Coalbed Methane Reservoir Physical Characteristics and Favorable Coal Seam Optimization in Manas River-Santun River area

作　　者：李中博 李瑞明 周梓欣 李万军 张娜 汪路南 毋腾飞 Li Zhongbo;Li Ruiming;Zhou Zixin;LiWanjun;Zhang Na;Wang Lunan;Wu Tengfei(CBM Research and Development Center of Xinjiang Coal Geological Bureau,Urumqi,Xinjiang,830091,China;Geological Research Institute of Xinjiang Uygur Autonomous Region,Urumqi,Xinjiang,830091,China)

机构地区：[1]新疆煤田地质局煤层气研发中心,新疆乌鲁木齐830091 [2]新疆维吾尔自治区地质研究院,新疆乌鲁木齐830091

出　　处：《新疆地质》2024年第4期569-577,共9页Xinjiang Geology

基　　金：新疆煤层气储层研究及规模有利区优选创新团队(2023TSYCTD0001);“天山英才”培养计划-科技创新领军人才(2023TSYLJ0005)项目共同资助。

摘　　要：对煤储层物性特征的认识是煤层气高效开采的关键。在全面收集准南煤田玛纳斯河-三屯河一带基础地质报告及岩心实验测试结果的基础上,采用多种数学分析法,对研究区煤层气储层物性特征进行系统分析,构建了研究区有利勘探煤层优选体系并进行有利煤层的优选。研究结果表明:西山窑组B3、B4、B5号煤层为研究区主力煤层,平均可采厚度较大,宏观煤岩类型为半暗煤,有机显微组分以镜质组为主,含气量和甲烷浓度较高,煤岩吸附性较好,孔裂隙发育程度一般、渗透率较低,顶底板岩性多为炭质泥岩和粉砂岩;从煤层气资源、煤储层和煤层气保存等条件优选出9个地质因素作为二级决策指标,通过层次分析法计算出其主观权重并进行分类处理,建立了适宜研究区的有利勘探煤层优选体系;在评价体系的基础上,采用加权求和法优选出B3号煤层作为准南煤田玛纳斯河-三屯河一带的煤层气前期开采煤层,为准南煤田玛纳斯河-三屯河一带煤层气勘探开发提供指导方向。The understanding of the physical properties of coal reservoirs is the key to the efficient exploitation of coalbed methane.Based on the comprehensive collection of basic geological reports and core experimental test results in the Manas River-Santun River area of the Coalfield in southern Junggar Basin,a variety of mathematical analysis methods were used to systematically analyze the physical properties of coalbed methane reservoirs in the study area.At the same time,a favorable exploration coal seam optimization system in the study area was constructed and the favorable coal seams were optimized.The results show that the No.B3、B4 and B5 coal seams of Xishanyao Formation are the main coal seams in the study area.The average recoverable thickness is large,the macroscopic coal rock type is semi-dark coal,the organic macerals are mainly vitrinite,the gas content and methane concentration are high,the coal rock adsorption is good,the pore fracture development degree is general,the permeability is low,and the roof and floor lithology are mostly carbonaceous mudstone and siltstone.Nine geological factors were selected as the second-level decision-making indexes from the conditions of coalbed methane resources,coal reservoirs and coalbed methane preservation.The subjective weight was calculated by analytic hierarchy process and classified,and a favorable exploration coal seam optimization system suitable for the study area was established.On the basis of the evaluation system,the weighted summation method is used to optimize the No.B3 coal seam as the pre-mining coal seam in the study area,which provides guidance for the exploration and development direction of coalbed methane in the Manas River-Santun River area of the Coalfield in southern Junggar Basin.

关 键 词：准南煤田 煤层气储层 物性特征 有利煤层 优选 

分 类 号：P618.13[天文地球—矿床学] TD712[天文地球—地质学]