多井约束反演在煤层厚度定量预测中的应用  

Application of Multi-Well Constrained Seismic Inversion in Quantitative Prediction of Coal Seam Thickness

作　　者：师素珍[1] 李赋斌[1] 梁平[1] 袁莉[1] 陈凤英[1] 李姗姗[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《采矿与安全工程学报》2011年第2期328-332,共5页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2009CB219603);国家自然科学基金重大项目(40874071);国家"十一五"科技支撑计划项目(2006BAK03B01);国家创新研究群体基金项目(50221402);教育部"长江学者和创新团队发展计划"项目(IRT0408)

摘　　要：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.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.

关 键 词：多井约束反演 定量预测 波阻抗 

分 类 号：P631.4[天文地球—地质矿产勘探]