Application of Multi-Well Constrained Seismic Inversion in Quantitative Prediction of Coal Seam Thickness
Application of Multi-Well Constrained Seismic Inversion in Quantitative Prediction of Coal Seam Thickness
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发表时间：
2011
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通讯作者：
Li Shan-shan
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作者：
Li Shan-shan
为提高煤厚预测精度，采用基于多井约束反演的波阻抗体生成方法，以桃园煤矿10号煤层为例，首先通过测井分析建立全频带地质模型，然后利用共轭梯度算法对模型进行改进，直至合成地震数据与实际地震数据最佳匹配，由于煤的阻抗远低于围岩的阻抗，通过对煤层色值的拉伸和对围岩色值的压缩，使煤的结构特征更加清晰，从而精细地刻画了煤层厚度的变化趋势，多井约束反演方法实现了煤层厚度的定量预测，提高了煤层厚度的预测精度。
A method based on multi-well constrained inversion to generate the impedance volume is applied to improve the prediction accuracy of coal thickness.Taking No.10 coal-seam in Taoyuan Coal Mine as an example,we first establish a full band of geological model from the log analysis,then use conjugate gradient algorithm to improve the model,until the synthetic seismic data matches best with the actual seismic data,so the high resolution impedance volume is achieved.Owing to the fact that the impedance of coal is far lower than that of surrounding rock,the structural characteristics of coal becomes more clear by stretching the color value of coal seam and compressing the color value of surrounding rock,thus the variation trend of coal seam thickness is finely discribed,and coal thickness of inversion results correspond with the borehole revealed.The multi-well constrained inversion method realizes the quantitative prediction of coal seam thickness and improves the prediction accuracy of coal thickness.