摘要
电成像测井数据形成的井周电导率图像通常存在4个或8个由电扣极板间隔形成的空白条带以及因极板与井壁黏滞造成的局部异常区域,本研究提出了一种基于小波域分解加快速行进(Fast Matching Method,FMM)插值算法实现了电导率图像空白条带填充及异常区修复的方法,使插值或修复后的电导率数据能更好地反映缝洞等微构造。文中研发的融合小波变化与高阶扩展FMM数字图像修复算法,首先,将存在空白带的电导率图像数据采用二抽取小波变换进行频谱分解;其次,对分解后缓变的低频分量采用高阶扩展FMM算法进行局部空白带的内插重建;再次,对高频分量通过已重建的低频部分的水平、垂直和两个对角四个方向的值进行预测重构;还有,基于重构后的高频和低频分量运用小波逆变换加权得到插值重构的电导率图像数据;最后,将文中的方法应用于某油田的多口井实测资料,获得了良好的应用效果。
There are four or eight blank blocks in the conductivity image derived from electric imaging well logging data,because of the gaps among the electric pads and/or temporal failure of the electric pads.In this study,a fast matching method(FMM)interpolation algorithm based on wavelet decomposition is proposed to accomplish the blank block interpolation and restoration of the distorted response of the conductivity image derived from electric imaging well logging data.The interpolated or restored electric conductivity image can indicate such microstructures as fractures and vugs.The processing method thus developed merges the wavelet transform into higher order extended fast matching method(FMM)and interpolates the blank blocks and restores the distorted responses.The fusion algorithm of wavelet transform and high-order extended FMM is developed in this paper.Firstly,the electric conductivity image with blank blocks is decomposed with binary wavelet transform in spectral domain.Secondly,the blank blocks in the low frequency components of the decomposed signal are interpolated by means of higher order extended FMM.Next,reconstruction of the blank blocks in the higher frequency components by the prediction values of the horizontal,vertical and two diagonal components from the reconstructed low frequency components.Furthermore,the reconstructed low and high frequency components are wavelet transformed into reconstructed domain conductivity data set.Finally,the developed technique is applied to the measured data of several wells in an oil field and sound results are obtained.
作者
王磊
沈金松
苏朝阳
洪晶
李振苓
Wang Lei;Shen Jinsong;Su Zhaoyang;Hong Jing;Li Zhenling(College of Geophysics, China University of Petroleum, Beijing 102249, China;Huabei Branch, China Petroleum CO. LTD., Renqiu Hebei 062552, China)
出处
《工程地球物理学报》
2020年第5期531-540,共10页
Chinese Journal of Engineering Geophysics
基金
中国石油天然气股份有限公司重大科技专项项目(编号:2017E-15)。
关键词
成像测井电导率图像
快速行进算法
小波分解
空白条带填充
响应畸变修复
conductivity image of the electric imaging well logging
the fast matching method
wavelet decomposition
reconstruction of blank strips
restoration of distorted responses
作者简介
第一作者:王磊(1991-),男,博士研究生,主要从事油气储层成像测井评价相关研究工作,E-mail:wangleixtn@qq.com;通讯作者:沈金松(1964-),男,教授,博士,博士生导师,主要从事地球物理测井和电磁法勘探理论模拟与应用研究,E-mail:shenjinsongcup@163.com。
