纳雍补作区块煤层气成藏控因及勘探方向  

Coalbed Methane Accumulation Control Factors and Exploration Direction in Nayong Buzuo Block

作　　者：邓兰 曾家瑶 DENG Lan;ZENG Jiayao(Guizhou Provincial Engineering and Technology Research Center of Coalbed Methane and Shale Gas,Guiyang,Guizhou 550000;Guizhou Provincial Coalfield Geology Bureau,Guiyang,Guizhou 550000)

机构地区：[1]贵州省煤层气页岩气工程技术研究中心,贵州贵阳550000 [2]贵州省煤田地质局,贵州贵阳550000

出　　处：《中国煤炭地质》2024年第4期24-29,共6页Coal Geology of China

基　　金：贵州省科技计划项目(黔科合战略找矿[2022]ZD001)“贵州省煤层气(煤矿瓦斯)抽采提产增效关键技术及工程试验”。

摘　　要：基于大量的煤田地质勘探资料,深入分析了研究区煤的变质程度、煤岩煤质特征、煤层顶底板封盖性、煤层埋深、构造和水文地质条件等煤层气成藏控制因素,采用体积法估算了研究区煤层气地质资源量,并进一步提出下一步勘探方向。结果表明:研究区水文地质和高致密的煤层顶底板对煤层气起到封闭控气作用;煤层埋深、煤岩煤质和煤的变质程度是造成各主采煤层含气量差异的主要因素;估算出研究区煤层气资源量为68.82×10^(8) m^(3),为中型气藏,另外优选出区块1为Ⅰ级甜点区,可作为研究区先期勘探开发区。Based on a large number of coal geological exploration data,in-depth analysis of the study area of the metamorphic degree of coal,coal,poroperm characteristics,the coal seam roof and floor block sex,coal seam buried depth,structure and hydrogeological condition such as control factors,the coalbed methane volume method is used to estimate the CBM geological resources in the study area,and further puts forward the next step prospecting direction.The results show that the hydrogeology and high density coal seam top and bottom plate in the study area play a sealing and gas control role on coalbed methane.The depth of coal seam,the quality of coal rock and the degree of coal metamorphism are the main factors that cause the difference of gas content in each main coal seam.It is estimated that the CBM resources in the study area are 68.82×10^(8) m^(3),which is a medium-sized gas reservoir.In addition,block 1 is selected as a Grade Ⅰ sweet spot,which can be used as a preliminary exploration development zone in the study area.

关 键 词：煤层气 成藏控制因素 构造 水文地质 勘探方向 

分 类 号：P618.13[天文地球—矿床学]