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为了提高煤厚的预测精度,采用了多井约束反演生成波阻抗体的方法.以桃园矿10煤层为例,从测井分析出发,建立全频带的地质模型,采用共轭梯度算法不断修改模型,直到模型合成的地震数据与实际地震数据最佳吻合为止,得到了高分辨率的波阻抗体.针对煤层波阻抗值远远低于围岩这一特点,采用将煤层波阻抗的色标值拉伸,围岩色标值压缩的方法更加凸显了低阻抗煤层,从而精细刻画了煤层厚度的变化趋势,反演得到的煤厚结果与钻孔揭露煤厚资料完全吻合.多井约束反演方法实现了对煤层厚度的定量预测,提高了煤厚预测的精度.
In order to improve the prediction accuracy of coal thickness, a method of multi-well constrained inversion to generate wave impedance is used.At the example of logging formation in No 10 seam of Taoyuan Coal Mine, a full-band geological model is established and modified by conjugate gradient algorithm Model until the model synthetic seismic data and the actual seismic data best match up, get a high-resolution wave impedance body.For the coal seam wave impedance value is far lower than the characteristics of the surrounding rock, the seam impedance of the color code The value stretching and the compressing method of surrounding rock color values further highlight the low resistance coal seam, so as to finely characterize the trend of coal seam thickness. The inversion of coal thickness results is in good agreement with the data of coal seam thickness exposed by drilling. The method realizes the quantitative prediction of coal seam thickness and improves the accuracy of coal thickness prediction.