在三维海底剖面测量中应用广播式 RTK 进行自动静态校正

IF 2.3 4区 地球科学
Jungkyun Shin, Jiho Ha, Kyoungmin Lim
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引用次数: 0

摘要

为了扩大传统单通道海底剖面仪的扫描范围,人们开发了各种类型的三维海底剖面仪(SBPs)。然而,数据采集过程经常受到涌浪和潮汐变化引起的水深波动的影响。这些波动在三维海底剖面测量过程中尤为明显,当震源频带达到几千赫兹时,会严重扭曲地震反射的双向传播时间,从而可能阻碍高保真地震立方体的生成。本研究在数据采集过程中实时记录了每个震源和接收道的高精度三维坐标,并将其用于叠前基尔霍夫深度迁移,以生成静校正地震立方体。为了简化在沿海地区工作的勘探系统的定位数据采集,集成了广播实时运动学(RTK),通过广播无线电波接收 RTK 修正信号,从而促进了实时生成每个震源和接收道三维坐标的方法。此外,还设计了一种基尔霍夫迁移算法,利用震源和接收器的三维坐标有效生成静校正地震立方体。在潮差达到 4 米的韩国珍岛附近水域采集了野外数据,从而生成了 50 厘米粒度的超高频地震立方体。通过对地震立方体的分析,验证了自动静校正方法的稳健性和适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Application of broadcast RTK for automated static correction in 3D sub-bottom profiling

Application of broadcast RTK for automated static correction in 3D sub-bottom profiling

Application of broadcast RTK for automated static correction in 3D sub-bottom profiling

Various types of 3D sub-bottom profilers (SBPs) have been developed to widen the swath coverage of conventional single-channel SBPs. Nevertheless, the data acquisition process is frequently influenced by fluctuations in water depth, attributed to swells and tidal variations. These fluctuations, particularly pronounced during 3D sub-bottom profiling when source frequency bands reach several kHz, significantly distort the two-way travel time of seismic reflections, potentially hindering the generation of high-fidelity seismic cubes. In this study, high-precision 3D coordinates of each source and receiver channel were recorded in real-time during data acquisition and employed for pre-stack Kirchhoff depth migration to produce a static corrected seismic cube. To streamline the acquisition of positioning data for the survey system operating in coastal areas, broadcast real-time kinematics (RTK) was integrated to receive RTK correction signals via broadcast radio waves, facilitating a real-time method for generating 3D coordinates for each source and receiver channel. Additionally, a Kirchhoff migration algorithm was devised to efficiently generate the static corrected seismic cube using the 3D coordinates of the source and receiver. Field data were collected in waters near Jindo, South Korea, where tidal differences reached 4 m, resulting in the production of an ultrahigh-frequency seismic cube with a 50 cm bin size. The robustness and applicability of the automated static correction method were validated through analysis of the seismic cube.

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来源期刊
Acta Geophysica
Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.80
自引率
13.00%
发文量
251
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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