多井约束反演在煤层厚度定量预测中的应用
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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.
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.
引文
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[3]刘天放,陈斌,付金生.地震反演煤层厚度的谱矩法及其应用[C]//中国煤田地质总局岩性勘探课题组.煤田地球物理岩性勘探文集.北京:煤炭工业出版社,1996:135-146.
[4]董守华.地震资料煤层横向预测与评价方法[M].徐州:中国矿业大学出版社,2004.
[5]刘雯林.油气田开发地震技术[M].北京:石油工业出版社,2004.
[6]印兴耀,韩文功,李振春,等.地震技术新进展(下)[M].东营:中国石油大学出版社,2006.
[7]徐伯勋,白旭滨,于常青.地震勘探信息技术:提取、分析和预测[M].北京:地质出版社,2004.
[8]孟宪军.复杂岩性储层约束地震反演技术[M].东营:中国石油大学出版社,2005.
[9]赵政璋,赵贤正,王英民,等.储层地震预测理论与实践[M].北京:科学出版社,2005.
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