公开(公告)号：US20240230941A9

公开(公告)日：2024-07-11

申请号：US18377237

申请日：2023-10-05

Applicant: PGS Geophysical AS

Inventor： Martin Widmaier ,  Ashish Misra ,  Manuel Beitz

IPC: G01V1/38 ,  G01V1/28 ,  G01V1/30 ,  G01V1/34

CPC classification number: G01V1/3843 ,  G01V1/282 ,  G01V1/303 ,  G01V1/345

Abstract: A marine seismic survey comprises towing a first source and a first streamer spread having a length L behind a first vessel. Sensors in the streamer spread record signals from the first source over a range of offset distances X to X+L. A second source is towed behind a second vessel that does not tow a streamer spread. Sensors in the streamer spread record signals from the second source over a range of offset distances A+L to A+2L. Sensors in the streamer spread do not record signals over a range of offset distances X+L to A+L from any active seismic sources used in the marine seismic survey.

公开(公告)号：US11815641B2

公开(公告)日：2023-11-14

申请号：US17523284

申请日：2021-11-10

Applicant: PGS Geophysical AS

Inventor： Manuel Beitz

IPC: G01V1/38 ,  G01V1/24

CPC classification number: G01V1/3861 ,  G01V1/24 ,  G01V1/3843

Abstract: Techniques are described for utilizing far offset impulsive source activations in various contexts, including when performing marine seismic surveys, when manufacturing a geophysical data product in conjunction with such surveys, or when generating an image of geological features of a subsurface. According to some embodiments, near offset impulsive source activations are caused in a body of water at each of a plurality of near offset shot points, and composite far offset impulsive source activations are caused in the body of water at each of a plurality of far offset shot points. Each of the composite far offset impulsive source activations comprises a succession of component impulsive source activations occurring over a far offset shot length. The far offset shot length is short enough to satisfy a stationary source assumption for frequencies at or below a maximum frequency of interest for the far offset shot points.

公开(公告)号：US10571589B2

公开(公告)日：2020-02-25

申请号：US15627508

申请日：2017-06-20

Applicant: PGS Geophysical AS

Inventor： Manuel Beitz ,  Christian Strand ,  Rolf Huibert Baardman

IPC: G01V1/38 ,  G01V1/00

Abstract: A system for constraining a dither time can comprise a source and a controller coupled to the source. The controller can be configured to actuate the source in sequence, while the source is moving through a fluid volume at a bottom speed, with an actuation time interval between each actuation comprising a sum of a nominal time and a dither time for each actuation and constrain the dither time for each actuation such that a reduction of the actuation time interval relative to a directly precedent actuation time interval is at most a threshold dither time difference, wherein the threshold dither time difference corresponds to a maximum bottom speed.

公开(公告)号：US20190187314A1

公开(公告)日：2019-06-20

申请号：US16213214

申请日：2018-12-07

Applicant: PGS Geophysical AS

Inventor： Edwin Hodges ,  Manuel Beitz

IPC: G01V1/38

CPC classification number: G01V1/3808 ,  G01V2210/121 ,  G01V2210/127

Abstract: Techniques are disclosed relating to acquisition and imaging for marine surveys. In some embodiments, a transition survey that uses both one or more sources of a first type (e.g., impulsive sources) and one or more sources of a second type (e.g., vibratory sources) may facilitate calibration of prior surveys that use the first type of sources with subsequent surveys that use the second type of source. In some embodiments, the different types of sources may be operated simultaneously at approximately the same location. In some embodiments, signals generated by the sources are separated, e.g., using deconvolution. The signals may then be compared to generate difference information, which in turn may be used to adjust sensor measurements from a previous or subsequent survey. In various embodiments, the disclosed techniques may improve accuracy in images of geological formations and may facilitate transitions to new types of seismic sources while maintaining continuity in 4D surveys.

公开(公告)号：US20180321406A1

公开(公告)日：2018-11-08

申请号：US15967969

申请日：2018-05-01

Applicant: PGS Geophysical AS

Inventor： Christian Strand ,  Manuel Beitz ,  Okwudili Orji ,  Averrouz Mostavan ,  Stig Rune Lennart Tenghamn ,  Anders Göran Mattsson

IPC: G01V1/38

CPC classification number: G01V1/3808 ,  G01V1/006 ,  G01V1/3843 ,  G01V1/3861 ,  G01V2210/127

Abstract: Techniques are disclosed relating to geophysical surveying. In some embodiments, a marine survey vessel tows multiple sensor streamers including a group of four innermost streamers in a cross-line direction relative to a centerline of tow. In some embodiments, the vessel tows two or more vibratory sources between two outermost streamers in the first group, in a cross-line direction. In some embodiments, the two or more sources are simultaneously operated using different codes that are uncorrelated to at least a threshold degree. Various disclosed narrow-tow techniques may allow increased streamer separation without reducing cross-line bin size and/or reduce cross-line bin size for a given streamer separation, relative to conventional techniques.