利用弹性多参量反演技术预测煤矿瓦斯富集区  

Discussion on Coalmine Gas Enriched Area Prediction through Elastic Multiparameter Inversion

作　　者：林建东[1] 张兴平[1] 孙宇菲[1] 罗忠琴[1] 王运革 

机构地区：[1]中国煤田地质总局地球物理勘探研究院,河北涿州072750 [2]山西潞安矿务局常村煤矿,山西屯留046100

出　　处：《中国煤炭地质》2015年第11期57-61,共5页Coal Geology of China

基　　金：中石油股份公司重大专项二期-煤层气勘探开发关键技术与示范应用研究项目(2013E-22)经费资助项目

摘　　要：通过建立煤层裂隙、含气性等与其弹性参数关系,进一步理清了瓦斯富集与储层弹性参数变化量之间的内在联系——煤层瓦斯含量与煤层速度、密度呈现负相关特征。以典型的煤矿采区实测数据为基础,计算了5个煤层弹性参数随煤层中瓦斯的吸附量变化关系,结果表明:煤层中瓦斯含量与密度呈现出负相关性;与密度变化量、剪切模量变化量、拉梅常数变化量及AVO检测因子4个参数呈现正相关关系。在三维地震研究区采用与瓦斯含量呈正相关的4个弹性参数对瓦斯富集区分别进行了预测。引入综合评价因子,建立其与4种岩性反演结果相关的一次线性函数,并绘制4弹性参数综合预测瓦斯富集区成果图,达到预测煤层瓦斯富集区的目的。Based on relationship between coal seam fissure, gas-bearing property and elastic parameters, sorted out further internal log？ic between gas enrichment and coal reservoir elastic parameter variation—coal seam gas content and velocity, density present negative correlation features. On the basis of typical coalmine winning district measured data, computed variation of 5 coal seam elastic parame？ters along with the adsorbance variation. The result has shown that coal seam gas content and density is negatively correlated;with 4 pa？rameters of density, shear modulus, Lame constant variations and AVO detection factors present positive correlation. In 3D seismic prospecting study area, using 4 elastic parameters positively correlated with gas content carried out gas enrichment area prediction re？spectively. Introduced factors of comprehensive assessment, established 4 lithologic inversion results one-off correlation function, and plotted 4 elastic parameters comprehensively predicted gas enrichment area result map, and finished with comprehensive prediction of coal seam gas enrichment area target.

关 键 词：瓦斯 弹性参数 密度变化量 剪切模量变化量 拉梅常数变化量 AVO检测因子 

分 类 号：P631.4[天文地球—地质矿产勘探]