基于Gray方程的三参量AVO反演及煤层气富集区预测

Three-parameter AVO inversion based on Gray equation and prediction of CBM enrichment zone

摘要: 通过AVO（Amplitude Versus Offset）反演可直接求取煤层气储层的弹性参数，指导储层的评价工作。在介绍Gray近似方程的基础上，应用该方程进行了三参量AVO反演方法的研究，直接计算出了煤层气储层的密度、体积模量和剪切模量；依据煤层气富集区3个弹性参数的特征，对比求取3个弹性参数剖面后，圈定出煤层气富集区；最后，通过模型和实例分析，验证该方法的可行性。

Abstract: Elastic parameters of coal reservoir can be got directly through AVO inversion to guide the evaluation of reser-voir. Based on the introduction of the Gray approximate equation, the equation is used to study the three-parameter AVO in-version, the density, the bulk modulus and the shear modulus of CBM reservoir can be calculated directly. According to the characteristics of three elastic parameters in CBM enrichment zone, CBM enrichment zone was delineated after comparing the three elastic parameters. Finally,through model and case analysis, the feasibility of the method was verified.