煤层气地震勘探技术研究现状及发展趋势

国内外用于煤层气地震勘探的方法主要有:运用地震、测井、地质等资料的地震反演技术;利用振幅随偏移距的变化预测岩石孔隙中流体性质变化的AVO技术;利用纵横波预测煤层中的裂隙发育部位,进而准确预测瓦斯富集部位的三维三分量地震勘探技术等。可以预计:综合利用三维地震、地球物理测井及钻探资料预测煤层气富集区,必将成为今后煤层气地震勘探技术的发展趋势。

Present and Future of Seismic Exploration Technology Applied in CBM

The main means of CBM seismic exploration in domestic and overseas include: seismic inversion,which makes use of seismic data、well-logging and geology;AVO method,which is based on the specialty of Amplitude-Versus-Offset to forecast abnormal change of liquid property in the cranny layer;3D3C method,which can use both of P-wave and S-wave information to forecast the region of dense cranny layer,and it can be used to evaluate the rich position of CBM.As can be seen,it is becoming a tendency that comprehensive interpretation of 3D、well-logging and bore hole drilling will have a good prospecting in forecasting the rich area of CBM.