多频电磁波测井数据的反演成像技术及应用

被引:4
作者
沈金松
机构
[1] 石油大学盆地与油藏研究中心北京
关键词
电磁波测井; 最小二乘法; 反演; 有限元法; 轴对称分布; 成像技术; 应用;
D O I
10.16489/j.issn.1004-1338.2002.03.001
中图分类号
P631.8 [地下地球物理勘探];
学科分类号
0818 ; 081801 ; 081802 ;
摘要
针对测井数据反演成像问题的不适定性 ,采用了带不等式约束的正则化最小二乘迭代反演。模型响应的正演计算用有限元方法实现。模型响应对电阻率及介电常数的偏导数用格林函数和互换原理计算。对高低频电磁波测井数据的反演分两步进行 ,首先用低频数据得到电阻率的大致分布 ,再以此为初值 ,用高频电磁波数据同时反演电阻率和介电常数。通过对模型的数值模拟和某地热田 1口井的实际资料的应用表明 ,电磁波测井数据的反演成像能给出井周近旁介质的电性参数分布 ,而在离井较远的区域不能得到稳定可靠的解释结果。无论高频还是低频测井数据 ,要得到高质量的成像结果 ,工作频率的适当选择及接收器灵敏度的提高是至关重要的
引用
收藏
页码:177 / 183+264 +264
页数:8
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