Marine seismic survey designs for shallow subsurface investigations

By strategically positioning seismic sources relative to streamers during marine seismic surveys, the method enhances the imaging of shallow subsurface targets, addressing limitations in existing technologies and improving the accuracy and resolution of shallow target investigations.

WO2025083255A1 Publication Date: 2025-04-24PGS GEOPHYSICAL AS
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Patent Information

Application Number
PCT/EP2024/079580
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-16
Filing Date
2024-10-18
Publication Date
2025-04-24

AI Technical Summary

Technical Problem

Existing marine seismic surveys face challenges in effectively imaging shallow subsurface targets due to limitations in streamer length and seismic source placement, which affect the accuracy and resolution of shallow target investigations.

Method used

The method involves towing streamers with seismic sensors and positioning seismic sources at specific inline and crossline offsets relative to the streamers, including forward and aft zones, to generate a range of offset data that enhances imaging capabilities for shallow targets.

Benefits of technology

This approach improves the accuracy and resolution of shallow target imaging by achieving longer offsets, enhancing source separation, and improving noise removal and diffraction imaging, thereby better assessing subsurface features for offshore structure installations.

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Abstract

In survey configurations for towed streamer shallow target investigations, seismic sources are placed in one or more of several zones disposed at different inline offsets relative to the streamers. In some embodiments, a vessel tows a set of one or more streamers along with a set of one or more sources disposed aft of the tail end of the streamers. In other embodiments, a vessel tows a set of one or more streamers, a set of one or more near offset sources disposed forward of the front end of the streamers, and a set of one or more far offset sources disposed forward of the near offset sources.
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