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煤层厚度是煤层气资源量计算的基础数据,也是煤层气开发有利区评价的主要参数之一。通过对煤层厚度正演模型分析,认为当煤层厚度大于1.7 m时,均方根振幅属性随煤层厚度的增加而增大。利用HC研究区实际地震数据和钻井资料,以煤层厚度正演模型结果为依据,拟合井点处煤层厚度与均方根振幅属性之间的关系式,来预测HC研究区5#煤层厚度平面图。通过实钻井煤层厚度和预测厚度的误差统计分析,认为利用均方根振幅属性预测煤层厚度的方法简单,精度较高,能够满足煤层气勘探开发的需要。
Coal seam thickness is the basic data for CBM resource calculation and is also one of the main parameters for CBM favorable zone evaluation. Through the forward modeling of coal seam thickness, it is considered that when the thickness of coal seam is more than 1.7 m, the amplitude of rms property increases with the increase of coal seam thickness. Based on the actual seismic data and drilling data in the HC study area, the relationship between coal seam thickness and root mean square amplitude at the well point is based on the result of forward modeling of coal seam thickness to predict the thickness of No.5 seam in HC study area . Through the error statistical analysis of actual drilling coal seam thickness and predicted thickness, it is considered that the method of using RMS amplitude amplitude to predict coal seam thickness is simple and accurate, which can meet the need of CBM exploration and development.