平顶山煤田煤层气赋存地质条件及资源潜力评价  

CBM Hosting Geological Condition and Resources Potential Assessment in Pingdingshan Coalfield

作　　者：杨予生[1] 楚靖岩[1] 李建欣[1] 张晓逵[1] Yang Yusheng;Chu Jingyan;Li Jianxin;Zhang Xiaokui(The Fourth Exploration Team, Henan Bureau of Coal Geology, Zhengzhou, Henan 450000)

机构地区：[1]河南省煤田地质局四队

出　　处：《中国煤炭地质》2019年第6期45-49,共5页Coal Geology of China

摘　　要：平顶山煤田煤层气资源丰富,本文在分析煤层气赋存地质条件的基础上,对影响煤层气开采利用的煤层厚度、含气量、储层压力、吸附能力、渗透率等基本参数进行了分析,并评价了其的资源潜力。结果显示:平顶山煤田煤层厚度大,层数多,地层倾角小,各煤段基本都覆盖有泥岩、砂质泥岩等密闭性良好的区域性盖层,主采煤层二1煤厚度大,分布稳定,加之以水力封闭为主的水文地质条件,使得煤层气保存良好,赋存程度较高;煤变质程度较高,镜质组含量普遍大于60%,主采煤层主要是原生结构煤,割理、裂隙较发育,较大的吸附能力,这些有利因素为煤层气的生成和富集奠定了基础;根据煤层气试井资料,煤层渗透率普遍较低,平均仅为0.07mD,这可能与试验井煤层结构破环较为严重,裂隙多被充填致使连通性阻塞所致;煤储层压力属正常压力储层,煤层气解吸速率较高,煤层气的赋存处于欠饱和状态。The Pingdingshan coalfield has abundant CBM resources. Based on CBM hosting geological condition analysis, the paper has analyzed basic parameters impacting CBM exploitation and utilization including coal thickness, gas content, reservoir pressure, adsorption ability, permeability etc. and assessed CBM resources potential. The results have shown that coal seams in the coalfield have large thickness, multiple layers, small strata dip angle, coal groups basically have good tightness regional overburden of mudstone, sandy mudstone etc. Main mineable coal seam II1 has large thickness, steadily distributed, together with mainly hydraulic sealing hydrogeological condition, made CBM preserved well, high degree of hosting. The high degree of coal metamorphism made vitrinite content generally higher than 60%. Main mineable coal seam has primary structure, cleats and fissures well developed with larger adsorptivity. All of the beneficial factors have laid the foundation of CBM generation and enrichment. According to CBM well testing data, coal seam permeability is generally low, average only 0.07mD possibly caused by coal seam texture destruction rather serious, and fissures are mostly filled up and result in connectivity blocked. Coal reservoir pressure belongs to normal pressure reservoir;CBM desorption rate is rather high, the CBM hosting is in an undersaturation state.

关 键 词：煤层气 渗透率 资源潜力 平顶山煤田 

分 类 号：P618.13[天文地球—矿床学]