【摘要】 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。更多还原

【Abstract】 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.更多还原