【摘要】 实际测试表明:煤层气富集区区域在物性特征及地震响应上与煤层气含量较低区域有显著不同,煤层气富集区的地震波速度约为正常煤层的4/5。地震正演模拟结果显示:煤层气富集区地段在地震资料上出现地震波至时间加长、振幅减弱、频率降低的特征。本文以此理论为基础,利用波阻抗反演、频谱分解技术,对某矿区煤层气富集区进行了尝试性预测,实际抽采资料表明:这些方法预测的煤层气富集区与实际抽采的结果基本吻合。这些方法的应用为后续的煤层气开发奠定了基础。更多还原

【Abstract】 It is proved that there are significantly differences in physical characteristics and seismic response between CBM-riched regions and low CBM regions,and the velocity of seismic wave in the former is about 4/5 of that in the latter.The seismic forward modeling showed that the seismic wave arrival time was delayed,the seismic amplitude was weakened and the seismic frequency was reduced in CBM-riched regions.Based on these characteristics,the CBM-riched region in some coal mine was forecast by using wave impedance inversion and spectral decomposition.The prediction of CBM-riched region was consistency with the results from the actual extraction.The applications of these methods could provide a foundation for the development of CBM.更多还原