Abstract:

As China is focusing on CBM, it is becoming more and more important to research CBM-reservoir, particularly in the aspects of fine description of internal reservoir and prediction of gas-bearing properties and permeability. Due to unique characteristics of CBM-reservoir, conventional physical exploration is not very effective; however, the seismic techniques reveal a huge advantage. For example, seismic interprets the structure of CBM-reservoir and can tell the thickness of thin coal beds, and predict gas-bearing properties of CBM-reservoir by means of pre-stack AVO conversion, pre-stack elastic impedance ( EI ) conversion, and poststack acoustic impedance ( AI ) conversion, and predict permeability of CBM-reservoir by means of pre-stack direction AVO conversion and analyze curvature properties of seismic reflection stratum. The research results indicate that seismic techniques applied to CBM reservoirs have an obvious effect.

Key words: CBM, seismic technique, CBMreservoir, gasbearing properties, permeability

摘要：

随着我国对煤层气勘探开发的重视，煤层气储层的研究也越来越重要，特别是对煤层气储层内部结构特征的精细描述和刻画，以及对煤储层的含气性和渗透性预测，已成为研究的热点问题。由于煤层气藏自身所具有的独特特征，使得常规物理勘探方法难以对煤层气储层进行有效的研究，而地震技术则显示出其巨大优势。如利用地震技术解释煤储层构造；地震属性分析的方法研究薄煤层厚度；叠前AVO反演技术、叠前弹性阻抗（ EI ）反演技术和叠后波阻抗（ AI ）反演技术对煤储层含气性的预测；叠前方位AVO反演技术和地震反射层的曲率属性分析技术对煤储层渗透性的预测。经研究及实践表明，地震技术在煤储层研究中的效果明显。

关键词: 煤层气, 地震技术, 煤储层, 含气性, 渗透性