海水速度结构的OBS透射走时层析反演  

Transmitted wave traveltime tomography for seawater based on OBS observations

作　　者：刘玉柱[1,2] 刘雯 王建花 伍正 张建明 杨涛 杨积忠[1,2] 黄超[1,2] 董良国[1,2] LIU YuZhu;LIU Wen;WANG JianHua;WU Zheng;ZHANG JianMing;YANG Tao;YANG JiZhong;HUANG Chao;DONG LiangGuo(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;School of Ocean and Earth Science,Tongji University,Shanghai 200092,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;National Engineering Research Center of Offshore Oil and Gas Exploration,Beijing 100028,China)

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]同济大学海洋与地球科学学院,上海200092 [3]中海油研究总院有限责任公司,北京100028 [4]海洋油气勘探国家工程研究中心,北京100028

出　　处：《地球物理学报》2024年第9期3402-3411,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41930105);中国海洋石油有限公司"十四五"重大科技课题(KJGG-2022-0104)资助。

摘　　要：近年来,海洋高分辨率地震勘探领域取得了显著进展,对地震资料反演的精度要求日益严苛.为了提升后续处理的效率和准确性,获取更为精确的海水速度分布显得至关重要.然而,传统的走时层析方法在利用有限偏移距的海面拖缆数据时,往往难以达到理想的垂向分辨率,从而限制了海水速度建模的精确性.鉴于此,本文提出了一种基于OBS(海底地震仪)观测系统的透射波走时层析方法.该方法采用伴随状态法走时层析作为反演工具,利用OBS观测系统声压分量中的海水透射波走时信息,对海水速度结构进行精确反演.理论模型和实际资料实验结果表明,该方法能够准确建立海水速度模型,提高海水以下地层的成像效果.With the continuous development of seismic high-resolution exploration technology,the accuracy requirements for seismic inversion are getting higher.In order to improve the efficiency and accuracy of subsequent processing,it is crucial to get more accurate seawater velocity distribution.However,traditional traveltime tomography methods often have difficulty achieving ideal vertical resolution when using towed-line observation with limited offset,which limits the accuracy of seawater velocity modeling.In this paper,a transmitted wave traveltime tomography method based on OBS observations is proposed.The adjoint-state method of traveltime tomography is used as the inversion tool.This method utilizes the seawater transmission wave traveltime information in the sound pressure component of the OBS observation system to accurately invert the seawater velocity structure.The experimental results of both theoretical model and actual data show that this method can accurately establish a seawater velocity model and improve the imaging quality below the seawater.

关 键 词：OBS 透射波 走时层析 海水速度建模 

分 类 号：P738[天文地球—海洋地质] P631[天文地球—海洋科学]