滇东北地区煤层气富集特征及勘探目标优选  

CBM accumulation characteristics and exploration target selection in northeastern Yunnan, China

作　　者：邵龙义[1] 王学天[1] 张家强 侯海海[1] 唐跃 王巨民 林玉成 Shao Longyi;Wang Xuetian;Zhang Jiaqiang;Hou Haihai;Tang Yue;Wang Jumin;Lin Yucheng(College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China;Oil and Gas Resource Survey Center,China Geological Survey,Beijing 100011,China;Yunnan Provincial Coal Geological Survey Institute,Kunming,Yunnan 650218,China;Yunnan Provincial Bureau of Coal Geology,Kunming,Yunnan 650034,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 [2]中国地质调查局油气资源调查中心 [3]云南省煤炭地质勘查院 [4]云南省煤田地质局

出　　处：《天然气工业》2018年第9期17-27,共11页Natural Gas Industry

基　　金：国家科技重大专项"东北地区中低煤阶煤层气规模开发区块优选评价"(编号:2016ZX05041-004);中国地质调查局科研项目"全国煤层气成矿远景与选区研究"(编号:1212011220794)

摘　　要：滇东北地区镇雄—威信煤田上二叠统赋存丰富的煤炭及煤层气资源,具有良好的煤层气勘探开发前景。为了加快对该区煤层气资源的勘探开发步伐,通过调研前期煤田勘查及煤层气地质勘探资料,从含气性、煤层分布、煤岩煤质、含煤岩系岩性组合等方面研究了煤层含气量、甲烷浓度与煤层厚度、埋藏深度、煤岩煤质及顶底板岩性等参数之间的关系,分析影响煤层气富集成藏的主要因素,在此基础上建立了基于多层次模糊数学的煤层气选区评价模型,并对该区进行了煤层气有利区评价。结果表明:(1)煤层气富集主控因素为煤层厚度、煤层埋深和顶底板保存条件;(2)优选出资源潜力、储层性能、保存条件和开发条件等4个方面共计11项三级评价参数作为煤层气勘探目标评价的指标;(3)煤层气选区评价模型的评价结果显示,新庄矿区的煤层气勘探开发潜力为最好,洛旺、牛场—以古、马河次之。结论认为,该研究成果可为滇东北地区下一步的煤层气勘探开发工作提供地质依据。There are abundant coal resources and coalbed methane(CBM)resources in the Zhenxiong–Weixin Coalfield in the northeastern Yunnan Province and its CBM exploration and development prospect is promising.In order to promote the exploration and development of CBM resources in this area,we studied previous coalfield survey data and CBM geological exploration data.Then,we analyzed the relationships of gas content and methane concentration vs.coal seam thickness,burial depth,coal petrology,coal quality and roof and floor lithology from the aspects of gas bearing property,coal seam distribution,coal petrology,coal quality,and lithological assemblage of coal bearing strata.Besides,we briefly discussed the main influential factors of CBM accumulation.Finally,we established a CBM area selection evaluation model based on multi-layered fuzzy mathematics and applied it to CBM favorable zone evaluation in this study area.And the following research results were obtained.First,the main factors controlling CBM accumulation are coal seam thickness,burial depth and sealing capacity of roof and floor.Second,eleven third-order evaluation parameters are selected out from the aspects of resource potential,reservoir property,storage condition and development condition as CBM exploration target evaluation indicators.Third,the evaluation results of CBM area selection evaluation model show that the CBM exploration and development potential is the best in the Xinzhuang Field,followed by Luowang,Niuchang–Yigu,and Mahe.These research results provide a geological basis for CBM exploration and development in northeastern Yunnan in the following step.

关 键 词：滇东北 晚二叠世 煤层气 富集特征 层次分析方法 评价参数 有利区优选 新庄矿区 

分 类 号：P618.13[天文地球—矿床学]