斜缆宽频滤波特性研究

Research on Broadband Filtering Characteristic of Inclined Cable Seismic Acquisition

胡斌 李斌 冯奇坤 黄福强 王付洁 刘宏扬 张异彪

HU Bin LI Bin FENG Qikun HUANG Fuqiang WANG Fujie LIU Hongyang ZHANG Yibiao

中石化海洋石油工程有限公司上海物探分公司, 上海 201208

Shanghai Geophysical Branch, Sinopec Offshore Oilfield Services Company, Shanghai 201208, China

海上斜缆采集不同深度检波器产生不同的鬼波效应，以达到压制鬼波的目的，从而拓宽地震信号的频带宽度。为了研究斜缆不同采集方式的宽频效果，此文推导了叠加归一化谱的理论公式，并进行数值模拟对直斜缆电缆端滤波参数的研究，分析了直斜缆滤波特性的影响因素。从研究结果看出，斜缆深度变化范围对斜缆宽频效果影响最大。另外，对5种缆型的叠加归一化谱滤波特性进行对比，直斜缆压制鬼波的效果最好。从而得出，斜缆采集方式宜采用直斜缆型并加大缆的深度变化范围。

Inclined cables receive varied ghost wave generated by detector, which can suppress ghost waves and widen the frequency band of seismic signals. In order to study the broadband effect of different acquisition methods for inclined cables, the theoretical formula of superposition normalized spectrum is derived and numerical simulation is carried out to study the filtering parameters at cable ends of straight inclined cables, meanwhile the influencing factors of filtering characteristics of straight inclined cables are analyzed. From the analysis results, it can be seen that the variation range of inclined cable depth has the greatest influence on the broadband effect. In addition, the superposition normalized spectral filtering characteristics of five cable types are compared, and the straight inclined cable has the best effect in suppressing ghost waves. Therefore, it is concluded that the straight inclined cable type should be adopted as a better method of inclined cable acquisition and the cable depth variation range should be increased.

国家重大专项“深层立体震源-斜缆-OBS联合二维地震采集处理技术”（2016ZX05027-002-004）；本项研究受国家专项科研项目《东海深层低渗-致密天然气勘探开发技术》课题二《深层大中型气田勘探评价技术集成及应用》任务4《深层立体震源-斜缆-OBS联合二维地震采集处理技术》（2016ZX05027-002-004）资助。

https://doi.org/10.3969/j.issn.1008-2336.2019.03.015