改进的完备经验模态分解与WVD变换相结合在油气检测中的应用  

Improved complete empirical mode decomposition and WVD transformation method and its application in oil and gas detection

作　　者：邬蒙蒙 WU Meng-meng(College of Geophysics,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地球物理学院

出　　处：《油气地球物理》2020年第1期72-76,73-76,共5页Petroleum Geophysics

摘　　要：Wigner-Ville分布(WVD)是一种二次型时频分析方法,具有高分辨率和能量集中性等特点,但其本身是一种瞬时自相关函数的傅里叶变换,由于没有移动的时间窗,所以对于多分量信号存在严重的交叉项问题。而改进的完备经验模态分解(ICEEMD)是基于经验模态分解(EMD)的一种最新算法,它可以将非平稳、非线性的地震信号分解为一系列单分量的特征子信号,不仅分解速度快,同时还克服了EMD算法自身存在的模态混叠等问题。首先,逐道对地震数据进行ICEEMD分解,将地震信号分解各个IMF分量;其次,对每道所有的IMF分量进行WVD变换;最后,在南海某工区提取不同的单频剖面,利用“高频能量衰减,低频能量增强”的特点进行含油气性检测。南海某工区地震数据分析处理结果验证了该方法含油气性检测的准确性。The Wigner-Ville distribution(WVD)is a quadratic time-frequency analysis method with high resolution and energy concentration.However,WVD is a Fourier transform of instantaneous autocorrelation function.Since it has no moving time window,there is a serious cross-term problem for multi-component signals.The improved Complete Empirical Mode Decomposition(ICEEMD)is a new algorithm based on Empirical Mode Decomposition(EMD).It can decompose the non-stationary nonlinear seismic signal into a series of single-component eigensub-signals,which has a fast decomposition speed and overcomes the problem of modal aliasing existing in the EMD algorithm itself.The specific steps are:1)Decomposition of seismic data by ICEMMD and decomposing seismic signals into individual IMF components;2)Perform WVD transformation on all IMF components of each channel;3)Extracting different single-frequency profiles in a work area in the South China Sea,using the characteristics of“high-frequency energy attenuation,low-frequency energy enhancement”for oil-bearing detection.Based on the advantages of both WVD and ICEMMD,this paper analyzes the seismic data of a certain field in the South China Sea and combines the calcium curve to accurately detect the hydrocarbon-bearing properties of the reservoir.The results of seismic data analysis in a fiels of the South China Sea verify the accuracy of the method for detecting the oil-bearing property.

关 键 词：油气检测 低频阴影 改进的完备经验模态分解 WVD变换 

分 类 号：TN9[电子电信—信息与通信工程]