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

作　　者：李斌 顾元 黄福强 冯奇坤 LI Bin;GU Yuan;HUANG Fuqiang;FENG Qikun(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)

机构地区：[1]中石化海洋石油工程有限公司上海物探分公司,上海201208 [2]同济大学海洋与地球科学学院,上海200092 [3]广州海洋地质调查局,广州510075

出　　处：《海洋石油》2021年第1期1-7,共7页Offshore Oil

基　　金：中国地质调查局项目DD-20190230资助。

摘　　要：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.

关 键 词：天然气水合物 三源多缆 小面元 高分辨率 

分 类 号：P631.46[天文地球—地质矿产勘探]