公开(公告)号：US09651695B2

公开(公告)日：2017-05-16

申请号：US14337957

申请日：2014-07-22

Applicant: PGS Geophysical AS

Inventor： Shaoping Lu ,  Norman Daniel Whitmore, Jr. ,  Alejandro Antonio Valenciano Mavilio ,  Nizar Chemingui ,  Andrew Long ,  Grunde Rønholt

IPC: G01V1/38 ,  G01V1/36 ,  G01V1/28

CPC classification number: G01V1/36 ,  G01V1/284 ,  G01V1/38 ,  G01V2210/56 ,  G01V2210/632 ,  G01V2210/74

Abstract: One embodiment relates to a technological process for identifying a potential subsurface structure below a body of water. Three-dimensional seismic sensor data that includes at least two measured components is obtained. Up-going and down-going wavefields comprising multiples wavefields are constructed from the three-dimensional seismic sensor data by applying wavefield separation. The up-going and down-going wavefields are extrapolated to a reflector surface below a water bottom. An imaging condition is applied at the reflector surface to generate images that include information from the multiples wavefields. Angle gathers are constructed, where each angle gather is constructed by gathering the images generated using the multiples wavefields for a range of illumination angles. Other embodiments, aspects and features are also disclosed.

公开(公告)号：US20240012169A1

公开(公告)日：2024-01-11

申请号：US18371040

申请日：2023-09-21

Applicant: PGS Geophysical AS

Inventor： Manuel Beitz ,  Martin Widmaier ,  Andrew Long

IPC: G01V1/38

CPC classification number: G01V1/3852 ,  G01V1/3808 ,  G01V2210/1293 ,  G01V2210/165

Abstract: Methods for performing a marine survey of a subterranean formation using a hybrid combination of ocean bottom seismic (“OBS”) receivers, wide towed sources, and moving streamers are described herein. In one aspect, a sail line separation in a crossline direction is determined based on an average streamer separation and number of streamers. An array of OBS receivers are deposited on a surface of a subterranean formation with an OBS receiver separation that is based on the sail line separation. Wide towed sources and streamers are towed above the array of OBS receivers behind a survey vessel that travels sail lines separated by the sail line separation. The wide towed sources may be activated above the array of OBS receivers. Wavefields reflected from the subterranean formation are recorded at the OBS receivers and receivers located in the streamers as seismic data.

公开(公告)号：US11802986B2

公开(公告)日：2023-10-31

申请号：US16892557

申请日：2020-06-04

Applicant: PGS Geophysical AS

Inventor： Manuel Beitz ,  Martin Widmaier ,  Andrew Long

IPC: G01V1/38

CPC classification number: G01V1/3852 ,  G01V1/3808 ,  G01V2210/1293 ,  G01V2210/165

Abstract: Methods for performing a marine survey of a subterranean formation using a hybrid combination of ocean bottom seismic (“OBS”) receivers, wide towed sources, and moving streamers are described herein. In one aspect, a sail line separation in a crossline direction is determined based on an average streamer separation and number of streamers. An array of OBS receivers are deposited on a surface of a subterranean formation with an OBS receiver separation that is based on the sail line separation. Wide towed sources and streamers are towed above the array of OBS receivers behind a survey vessel that travels sail lines separated by the sail line separation. The wide towed sources may be activated above the array of OBS receivers. Wavefields reflected from the subterranean formation are recorded at the OBS receivers and receivers located in the streamers as seismic data.