应用三分量地震数据提高Langmuir法计算煤层气含量的精度——以淮南顾桥煤矿为例

Accuracy improvement by applying three-component seismic data during methane content calculation by Langmuir method:case study of Guqiao Coal Mine in Huainan

1.中国地质大学（北京），北京100083；2.中国科学院地球化学研究所，贵州贵阳550002；3.中国石油天然气集团公司东方地球物理勘探有 限责任公司方法研究中心，河北涿州072750

Yang Wei,China University of Geosciences (Beijing),Beijing 100083,China

在实验室解析得出吸附参数的基础上，使用Langmuir方程计算煤层气含量是目前预测煤层中煤层气含量的主要方法之一。此方法需已知地
应力和地层容重数据，在钻孔数量有限时，其预测精度有限。在已有钻孔测试数据和测井数据的基础上，通过三分量地震数据与测井资料联合
反演获得地层密度和纵、横波速度，直接计算精确的泊松比参数，进一步得到精确的地应力和地层容重，从而提高Langmuir法预测煤层气含量
的精度。结合淮南顾桥煤矿三维三分量地震数据和综合地球物理测井资料，计算了该区不同深度煤层的密度、泊松比和金尼克静水压力，提高
了煤层气含量的计算精度。

Calculating coal-bed methane by using Langmuir equation on the basis of obtained absorption parameters in the laboratory is
one of the mainly used methods to predict coal-bed methane content. This method needs given crustal stress and bulk
density,which have lower accuracy with less bore holes. With borehole and logging data,coal-bed density,P-wave and S-wave
velocity can be obtained by joint inversion combining three-component seismic data with logging data. Then the Possions
ratio can be directly calculated. Furthermore,the crustal stress and bulk density can be obtained precisely. By this means,we
can improve the accuracy of Langmuir method in predicting coal-bed methane content. At Guqiao Coalfield in Huainan by
applying this workflow to 3D3C seismic data and logging data,the density,Possions ratio and hydrostatic pressure of the
coal-bed with different depth were calculated. As a result,the computation accuracy of coal-bed methane content is enhanced.

10.3969/j.issn.1000-1441.2012.02.007