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.
Abstract
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.
基金项目
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)
维普
万方数据