三源多缆高密度地震采集技术在中国海域水合物调查中的应用

Application of Three-source and Multi-cable High-density Seismic Acquisition for Gas hydrate in Offshore China

李斌 顾元 黄福强 冯奇坤

LI Bin GU Yuan HUANG Fuqiang FENG Qikun

中石化海洋石油工程有限公司上海物探分公司，上海　201208 同济大学海洋与地球科学学院，上海　200092 广州海洋地质调查局，广州　510075

Shanghai Geophysical Branch, SINOPEC Offshore Oilfield Services Corporation Ltd., Shanghai 201208, China College of Marine and Earth Science, Tongji University, Shanghai 200092, China Guangzhou Marine Geological Survey, Guangzhou 510075, China

由于天然气水合物具有埋藏浅、横向变化快的特点，为了精细刻画天然气水合物矿体，需采用三维高分辨率地震调查技术。该文介绍了在中国海域针对水合物调查首次采用三源多缆的高密度、高分辨率三维地震采集技术。其采集参数为3震源、震源间距25 m、电缆间距75 m、采集面元6.25 m×12.5 m、震源沉放深度5 m、电缆沉放深度6 m。经过三维叠前深度偏移处理，资料信噪比、分辨率较以往资料有了非常大的提高，为水合物矿体研究奠定了基础。

The gas hydrates has the characteristics of shallow burial depth and rapid lateral change. In order to accurately describe the boundary of gas hydrate bodies, the three-dimensional high-resolution seismic survey technology is carried out. This paper introduces the high-density and high-resolution 3D seismic data acquisition with three sources and multiple cables, which is firstly used for gas hydrate survey in offshore China. The acquisition parameters are 3 seismic sources with 25 m spacing, the cable spacing is 75 m, the bin size is 6.25 m×12.5 m, the source depth is 5 m and the cable depth is 6 m. After 3D pre-stack depth migration processing, the signal-to-noise ratio and resolution have been greatly improved compared with previous data, laying a foundation for the study of gas hydrate.

中国地质调查局项目DD-20190230资助

https://doi.org/10.3969/j.issn.1008-2336.2021.01.001