【摘要】 基于国内外煤层瓦斯富集的岩石物理及地球物理响应的研究成果,提出了以煤层反射波振幅、频率及衰减等动力学特征变化为主要研究对象的地震纵波预测技术方案;探讨了利用叠后Gamma拟合声波约束反演、频谱分解属性分析和叠前AVO反演、弹性阻抗反演等纵波技术预测煤层瓦斯富集性的理论依据及实现方法。上述技术在沁水盆地进行了预测尝试,其获得的含气性预测成果与探井实测的瓦斯富集情况基本吻合,初步证明了上述纵波预测技术方法在开展煤层瓦斯富集区研究方面的可行性和有效性。更多还原

【Abstract】 Based on research findings of coal seam gas enrichment rock physics and geophysical response both home and abroad,put forward primary wave prediction technical scheme of to take dynamic characteristic variations of coal reflection amplitude,frequency and attenuation etc.as main subjects investigated,discussed theoretical foundation and implemental method of using primary wave technologies of poststack gamma-ray simulated acoustic wave constrained inversion,spectral decomposition attribute analysis and prestack AVO inversion,elastic impedance inversion etc.to predict coal seam gas enrichment.Above technologies have been tested in predictions in the Qinshui Basin,acquired gas potential results are basically agreed with gas enrichment results from exploratory well measured.Thus has preliminarily demonstrated the feasibility and effectiveness of the primary wave prediction technology in coal seam gas enrichment area study.更多还原