应用测井资料识别煤体结构及分层  

Application of logging data in recognition of coal structure and stratification

作　　者：陈跃[1] 汤达祯[1] 许浩[1] 吕玉民[1] 陈同刚[1] 田霖[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《煤田地质与勘探》2014年第1期19-23,共5页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2011ZX05038-001);国家重点基础研究发展计划(973计划)项目(2009CB219604)

摘　　要：煤体结构类型与煤储层孔裂隙特征密切相关,对煤层气开采具有重要意义。以韩城矿区为例,通过对区内的参数井取心样品分析,把煤体结构分为块煤(I类)、块粉煤(II类)、粉煤(III类)。对区内3号、5号和11号煤层的深侧向电阻率测井、井径测井和自然伽玛测井曲线特征进行对比,归纳了各煤体结构的测井曲线组合特征:I和III类煤电阻率曲线和自然伽玛曲线为平滑的箱型或钟形,II类煤则为波动的箱形;II和III类煤扩径严重,且II类煤差异扩径明显。据此,提出了一种利用电阻率测井、井径测井和自然伽玛测井等测井曲线组合识别煤体结构的方法,并利用这种方法准确识别出同一煤层不同煤体结构的分层。The type of coal structure which is very important for CBM exploitation, is closely related to the pore and fracture characteristics of coal reservoir. Taking Hancheng area as an example, based on the analysis of core samples of parameter wells, coal structure was divided into three groups, which are： lump coal（class I）, lump-powder coal（class II）and powder coal（class III）. According to the analogy of resistivity logs, caliper logs and natural gamma logs of NO.3, 5 and 11 coal seams, the relationship between well logs and coal structures in the study area was established：The form of resistivity logs and natural gamma logs of class I and III was smooth box or bell-shaped, while the logs of class II fluctuated strongly;Diameter extension of class II and III was serious and the diameter extension of class II was inhomogeneous. Thus, a method to identify coal structure through using re-sistivity logging, caliper logging and natural gamma logging is proposed in this paper, and based on this relation-ship, some stratifications in different coal structures in the same coal seam were also identified exactly.

关 键 词：测井曲线 组合特征 煤体结构 划分分层 

分 类 号：P631.8[天文地球—地质矿产勘探]