频率域2．5-D井间波形层析成像及其实际应用  

The 2.5-D cross-well waveform tomography in the frequent domain and its practical application

作　　者：曹辉[1] 陈国金[1] 郭建[1] 吴永栓[1] 姚振兴[2] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所,南京210014 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球物理学报》2008年第3期915-923,共9页Chinese Journal of Geophysics

基　　金：中国石化油藏综合地球物理研究中心重点研究项目(合同号:P02046)资助

摘　　要：从频率域3-D声波波动方程出发,结合井间观测方式的特点,基于Tarantola广义反演理论,提出了一种频率域2.5-D井间波形层析成像方法.数值模型试验结果表明:该方法对薄层厚度的分辨能力能达到约主频波长的1/4,且分辨率显著高于走时层析成像,尤其垂直分辨率有实质改善.模拟资料的抗噪试验表明:在信噪比为0.8的情况下,随机噪声对波形层析成像的影响较小;而相干噪声对全波形层析成像的影响显著,特别是初至波附近的强振幅干扰影响更为严重.井间实际资料的试处理结果表明:波形层析成像能很好地刻画井间介质的分布情况与储层连通性,对于油藏开发阶段的方案实施具有指导意义.Based on the 3-D acoustic equation and Tarantola＇s generalized inversion theorem, taking into consideration the character of cross-well survey, a 2. 5-D cross-well waveform tomography method in the frequency domain is presented here. The experimental results of the numeric models show that this method can achieve a resolution for the thin horizontal layers up to 1/4 of the dominant frequency wave length, and its resolution is obviously higher than the travel- time tomography, especially the vertical resolution is substantially improved. The anti-noise tests with synthetic data show that the random noise affects slightly the quality of the waveform tomography in the case of N/S=0. 8, but the coherent noise affects greatly, especially the strong amplitude disturbance near the first-arrival has a serious effect. The waveform inversion result of practical data shows that the waveform tomography can depict the distribution of the cross-well medium＇s property and the reservoir connectivity, and is of importance for oil development.

关 键 词：频率域 3-D声波波动方程 井间观测方式 广义反演 波形层析成像 分辨率 噪声 

分 类 号：P631[天文地球—地质矿产勘探]