大宁—吉县区块8号煤层薄层夹矸螺旋CT扫描精细表征  

Fine characterization of thin layer gangue inclusion in No.8 coal seam of Daning Jixian- Block by spiral CT Scanning

作　　者：田丰华 李小刚 朱文涛 戴瑞瑞 师斌斌 洪星 任勇 陈国辉 何睿 Tian Fenghua;Li Xiaogang;Zhu Wentao;Dai Ruirui;Shi Binbin;Hong Xing;Ren Yong;Chen Guohui;He Rui(Exploration,Development,and Construction Branch Company of Coalbed Methane Co.,Ltd.,CNPC,Xi′an 710068,China;Beijing Runze Innovation Technology Co.,Ltd.,Beijing 100120,China)

机构地区：[1]中石油煤层气有限责任公司勘探开发建设分公司,陕西西安710068 [2]北京润泽创新科技有限公司,北京100120

出　　处：《能源与环保》2023年第10期63-68,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国石油煤层气有限责任公司重大科技项目(2022KJ17)。

摘　　要：影响煤层气勘探获得高产的因素有很多,煤层结构中夹矸的存在就是其中之一。传统的技术手段在表征煤层夹矸中有诸多不足,螺旋CT扫描具有全岩心大视域优势,精度达到毫米级,通过扫描获取灰度横切片,生成岩心灰度平均值曲线,确定煤岩灰度基线和夹矸灰度值范围,精准划分煤层中夹矸,实现煤层结构的精细定量表征。根据夹矸平均厚度、夹矸累积厚度占比这2个参数,将大宁—吉县区块煤层结构类型划分为4种模式,即A类夹矸厚且少,B类夹矸厚且多,C类夹矸薄且少,D类夹矸薄且多。煤层结构的精细三维表征对煤层气单井储层精细评价及高产因素研究具有指导意义。Various factors affect the high yield of coalbed methane exploration,and the existence of gangue in the coalbed structure is one of them.The traditional technical means have many deficiencies in characterizing the gangue of coal seams.Spiral CT scanning has the advantage of large field of view,scanning accuracy reaches millimeter level,through scanning to obtain grayscale transverse slices,generate the average value curve of core grayscale,determine the grayscale baseline of coal rock and the grayscale value range of gangue,and then divide the gangue in the coal seam,which can realize the fine quantitative characterization of coal seam structure.According to the two parameters of the average thickness of the gangue and the proportion of the cumulative thickness of the gangue,the coal seam structure types in the study area can be divided into four modes,namely type A with thick and little gangue,type B with thick and much gangue,type C with thin and little gangue,and type D with thin and much gangue.The fine 3D characterization of coal seam structure is considered to be of guiding significance for the fine evaluation of CBM single well reservoirs and research on high yield factors.

关 键 词：煤层气 煤层结构 螺旋CT 煤层夹矸识别 

分 类 号：P618.13[天文地球—矿床学]