Title

The application of optimal deghosting algorithm on marine variable-depth streamer data

单位

(1.中海油能源发展工程技术物探技术研究所,广东湛江524057;2.中国地质大学(武汉)地球物理与空间信息学院,地球内部多尺度成像湖北省重点实验室,湖北武汉430074)

Organization

(1.CNOOC Ener-Tech-Drilling & Production Corporation,Development & Prospecting Geophysical Institute,Zhanjiang 524057,China;2.Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China)

摘要

常规海上拖缆采集数据受海水面虚反射(鬼波)影响存在陷波特性,近几年发展起来的变深度缆采集技术则使陷波特征分散,应用专门的去鬼波处理方法可获得宽频数据。在前人研究的基础上,开展了最优化联合反褶积压制鬼波算法及其在变深度缆采集数据中的应用研究。首先在频率-波数域导出了镜像缆记录生成公式,并在时空域实现了镜像记录的生成,然后基于原始炮集记录和镜像炮集记录,利用最优化联合反褶积去鬼波算法从变深度缆数据中提取上行波。合成数据及某海上实际变深度缆数据测试结果表明,最优化联合反褶积压制鬼波算法既能提高浅层的高频反射能量,又能提高深层的低频反射能量,从而拓宽地震反射资料的频带,提高勘探分辨率。

Abstract

In marine seismic data acquired by conventional towed-streamer,the notches is caused by ghost reflections from seawater surface.With the development of variable-depth streamer (VDS) acquisition technology,featured by ghost notch diversity,the broadband data can be obtained by applying special deghosting method.An optimal deghosting algorithm is applied to eliminate ghosts from VDS data in this paper.The formula to produce mirror data is derived in frequency-wavenumber domain,and the mirror data can then be obtained in time-space domain.Moreover,we apply an optimal deghosting algorithm to joint deconvolution of the original and mirror shots data and extract upgoing wave from VDS data.The deghosting of synthetic data and real marine variable-depth streamer data show that the processing results broadened the bandwidth,enhanced high-frequency response from the shallow layers and low-frequency response from the deep layers and improved the exploration resolution.

关键词：

变深度缆采集; 鬼波; 频率-波数域; 最优化去鬼波算法; 陷波;

Keywords:

variable-depth streamer acquisition,; ghost reflections, ; frequency-wavenumber domain,; optimal deghosting algorithm,; notch;

基金项目

国家科技重大专项子专题“莺琼盆地高温高压区高精度地震资料采集处理技术”(2011ZX05000023004001)和中海油总公司科技项目“倾斜电缆地震资料处理技术研究(CNOOC-KJ125-2011ZX05023NFCJF)”联合资助。

DOI

10.3969/j.issn.1000-1441.2015.04.006

海上变深度缆数据最优化压制鬼波方法及其应用