公开(公告)号：US11474269B2

公开(公告)日：2022-10-18

申请号：US16905544

申请日：2020-06-18

Applicant: PGS GEOPHYSICAL AS

Inventor： Christian Strand ,  Rick Irving ,  Magnus Wangensteen ,  Dan Allison

IPC: G01V1/38 ,  G01V1/30

Abstract: Numerous techniques and apparatus are disclosed relating to the performance of 4D marine geophysical surveys over at least first and second areas covered, respectively, by first and second preexisting baseline surveys. Performing the monitor surveys may include deploying a monitor survey streamer layout that can be used to repeat streamer positions of both the first and the second preexisting baseline surveys, and using the monitor survey streamer layout to perform the monitor survey over the first and second areas in a manner that repeats all streamer positions of the first preexisting baseline survey when over the first area, and that repeats all streamer positions of the second preexisting baseline survey when over the second area. Streamer layouts corresponding to the first and second preexisting baseline surveys may differ in at least one of the following characteristics: streamer separation or total number of streamers.