地震属性在煤层气开发有利区块优选中的应用

    Application of Seismic Attributes in Optimization of Favorable Coalbed Methane Development Area

    • 摘要: 为了在煤层气开发中优选有利区块,通过正演模拟,明确了最大振幅与煤层厚度相关性,从而划分了煤层较厚区域以及顶底板泥岩较发育区,并综合利用相干、曲率、蚂蚁体等属性圈定了裂缝发育区。此外,正演分析验证了以均方根为代表的地震属性与煤层气含量有着较好的正相关性。最后,以煤层厚度、顶底板泥岩发育条件、裂缝发育条件、煤层气富集性为基本条件,确定了研究区内的Ⅰ类和Ⅱ类有利区块,以便于在后期设计开发井位,进行煤层气抽采。

       

      Abstract: To select favorable area in the coalbed methane development, through forward modeling, the correlation between the maximum amplitude and the thickness of the coal seam is clarified, and the thicker area of the coal seam and the more developed area of mudstone on the roof and floor are classified. The coherence, curvature and ants were used to delineate the fracture zone. In addition, forward analysis verifies that the seismic attribute represented by root mean square has a good positive correlation with CBM content. Finally, taking the coal thickness, roof and floor mudstone, fracture development conditions, development conditions of coalbed methane enrichment as the basic conditions, Ⅰ favorable blocks and Ⅱ favorable blocks in the research area are determined to facilitate the design and development of wells and the coal bed methane extraction in the late stage.

       

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