WO2012022913A1 - Procédé de détermination de la correction en temps pour un détecteur disposé au fond de la mer - Google Patents
Procédé de détermination de la correction en temps pour un détecteur disposé au fond de la mer Download PDFInfo
- Publication number
- WO2012022913A1 WO2012022913A1 PCT/FR2011/051918 FR2011051918W WO2012022913A1 WO 2012022913 A1 WO2012022913 A1 WO 2012022913A1 FR 2011051918 W FR2011051918 W FR 2011051918W WO 2012022913 A1 WO2012022913 A1 WO 2012022913A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- detector
- determined
- wave
- emission
- seabed
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/303—Analysis for determining velocity profiles or travel times
- G01V1/305—Travel times
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
Definitions
- Seismic images are representations of the basement with two or three dimensions.
- the vertical dimension is called one of these dimensions corresponding either to the propagation times of the seismic waves or to the depths. They are obtained by techniques known as "migration" which use an estimated velocity model providing a mapping of the propagation velocity of the seismic waves in the rocks constituting the explored area. This velocity model is used to estimate the positions of subsurface reflectors from seismic records.
- the seismic images thus produced, as well as the models velocities have some distortions because they are only estimates derived from a necessarily limited number of measurements.
- detectors can be placed at the bottom of the sea on the subsoil to be explored. Seismic waves are emitted from points near the surface of the sea. These waves propagate in the water and penetrate the subsoil. The detectors placed at the bottom of the water on the surface of the subsoil will detect the arrival of the direct seismic wave as well as the waves reflected by the subsoil.
- a particularity of the detectors used is to be autonomous detectors. These detectors have an internal clock that must be synchronized before deployment and re-synchronized after recovery. The data collection period can reach several months, it can be observed temporal drifts. The acquisition time leads to observe residual drifts of the internal clocks of the detectors, synchronization errors between detectors, in particular variations in the origin time, shifts related to the possible variations of the seismic wave propagation velocity in the d-slot. 'water. This is superimposed on the tidal effects, the possible instabilities of the seismic source signal, the imperfect positioning of the detectors and source points, the inaccuracy of the propagation speed of the waves in the water section and the uncertainty. on bathymetry data.
- the invention thus proposes a determination method for a detector disposed on the seabed surface of the vertical propagation time (to) and the speed of propagation V in water of at least one wave emitted from one emission point from N emission points, the method comprising the following steps for at least one of the N emission points:
- the method according to the invention makes it possible to determine the vertical propagation time and the speed of propagation of the wave in the water slice situated above the detector.
- the vertical propagation time and the propagation velocity make it possible to determine the time corrections for a detector disposed on the surface of the seabed.
- a method according to the invention may further comprise one or more of the optional features below, considered individually or according to all possible combinations:
- the vertical propagation time to is determined by the following steps:
- the propagation speed is determined by the following steps:
- V propagation velocity
- the angle ⁇ between the normal to the plane tangent to the seabed surface at the location where the detector is placed and the vertical direction and / or the angle n between the projection on the horizontal plane (X, Y) of the normal to the plane tangent to the surface of the seabed where the detector is placed and the axis (X) in the reference centered on the detector is determined by:
- the angle ⁇ between the normal to the plane tangent to the seabed surface at the location where the detector is placed and the vertical direction and / or the angle n between the projection on the horizontal plane (X, Y) of the normal tangent to the surface of the seabed where the detector is placed and the axis (X) in the reference centered on the detector is determined by
- the method according to the invention is not sensitive to so-called stretching or stretching effects that can be created by the methods usually used.
- it can be implemented early in the treatment sequence, whereas, in more conventional methods, the corrections specific to each detector are made after migration, which requires to always follow the same treatment, not allowing to put more sophisticated techniques, such as the Vector Tiling Offset.
- the invention also relates to a computer program product comprising a series of instructions which, when loaded into a computer, causes the computer to carry out the steps of the method according to the invention.
- FIGS. 2a and 2b are diagrammatic representations of an arrangement of a detector and an emission point according to a second embodiment
- Figure 1 shows a projection along a vertical plane defined by the detector 10 disposed on the surface 11 of a seabed and the emission point 12 disposed on the surface of the sea.
- the wave can propagate directly from the emission point 12 to the detector, it is called direct wave 14.
- the propagation time of the direct wave between the emission point and the detector satisfies the following equation: t l d 2 ir with Z the depth to which is
- the wave emitted at the emission point 12 can also propagate from the emission point 12 to the detector 10 after reflections on the seabed and on the surface of the sea, this being called a multiple wave.
- the first multiple wave 16 corresponds to a reflection on the seabed and a reflection on the surface of the water before reaching the detector.
- equation (1) makes it possible to determine the vertical propagation time directly above detector 10.
- this approach does not require any prior knowledge of the speed of propagation in the water.
- Equation (2) leads to the determination of the speed of propagation of the wave in water.
- the method according to the invention is independent of the phase of the signal corresponding to the recording of the wave received by the detector.
- the quantity ⁇ can be obtained by means of the relation
- This direct arrival time pointed T d i r is known to a constant according to the detector. By following the procedure described in FR 52600 this time can be used to accurately determine the position of the detector, but also to provide an estimate of the zero offset time To.
- FIG. 2a shows a projection along a vertical plane defined by the detector 10 disposed on the surface 11 of the seabed and the emission point 12 disposed on the surface of the sea.
- the bathymetry may be more complex than a plane seabed.
- the parametric surfaces defined by equations 3 and 4 are thus sought. defining these surfaces, it is possible to obtain an estimate: of the time vertical to, of the plane of reflection defined in particular by the angles ⁇ , n and the dimension dz, and the average speed V in the water section by means of following relationships:
- the plane of reflection is defined as the plane tangent to the surface of the seabed where the detector is placed.
- the multiple wave can propagate outside the vertical plane comprising the path of the direct wave.
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Acoustics & Sound (AREA)
- Geophysics (AREA)
- Theoretical Computer Science (AREA)
- Oceanography (AREA)
- Databases & Information Systems (AREA)
- Mathematical Physics (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/817,405 US20130144535A1 (en) | 2010-08-16 | 2011-08-16 | Method for determining time correction for a detector placed on the seabed |
BR112013003306A BR112013003306A2 (pt) | 2010-08-16 | 2011-08-16 | método para determinar para um detector colocado sobre a superfície do leito marinho um tempo de propagação vertical e uma velocidade de propagação v na água de pelo menos uma onda emitida por pelo menos um ponto de emissão dentre n pontos de emissão e método para corrigir uma origem de tempo de sinais gravados por um detector colocado sobre a superfície de um leito marinho |
GB1301365.1A GB2496331B (en) | 2010-08-16 | 2011-08-16 | Method for determining time correction for a detector placed on the seabed |
NO20130386A NO20130386A1 (no) | 2010-08-16 | 2013-03-14 | Fremgangsmate for a bestemme tidskorreksjon for en detektor plassert pa havbunnen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1056617A FR2963833B1 (fr) | 2010-08-16 | 2010-08-16 | Procede de determination de la correction en temps pour un detecteur dispose au fond de la mer |
FR1056617 | 2010-08-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012022913A1 true WO2012022913A1 (fr) | 2012-02-23 |
Family
ID=43857821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2011/051918 WO2012022913A1 (fr) | 2010-08-16 | 2011-08-16 | Procédé de détermination de la correction en temps pour un détecteur disposé au fond de la mer |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130144535A1 (fr) |
BR (1) | BR112013003306A2 (fr) |
FR (1) | FR2963833B1 (fr) |
GB (1) | GB2496331B (fr) |
NO (1) | NO20130386A1 (fr) |
WO (1) | WO2012022913A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111352156A (zh) * | 2020-03-09 | 2020-06-30 | 吉林大学 | 多次波无关的地震资料自动速度分析方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10401515B2 (en) | 2014-06-18 | 2019-09-03 | Pgs Geophysical As | Estimation of water properties from seismic data |
CN104977615B (zh) * | 2015-07-01 | 2017-06-23 | 中国海洋石油总公司 | 一种基于模型统计拾取的深水obc资料多次波压制方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1052600A (fr) | 1951-03-20 | 1954-01-26 | Strachan & Henshaw Ltd | Dispositif encreur pour presses à imprimer |
EP0317288A2 (fr) * | 1987-11-16 | 1989-05-24 | Western Atlas International, Inc. | Procédé d'extension de la couverture sous-surface latérale dans la mesure sismique verticale |
GB2384053A (en) * | 2002-01-11 | 2003-07-16 | Westerngeco Ltd | Processing of acoustic data to obtain arrival time at receiver from down-going acoustic signal |
GB2436462A (en) * | 2006-03-21 | 2007-09-26 | Westerngeco Seismic Holdings | Methods and apparatus for range selection for positioning marine seismic equipment |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0018480D0 (en) * | 2000-07-27 | 2000-09-13 | Geco Prakla Uk Ltd | A method of processing surface seismic data |
WO2010045531A2 (fr) * | 2008-10-16 | 2010-04-22 | Services Petroliers Schlumberger | Imagerie de profil sismique vertical d'interfaces acoustiques |
-
2010
- 2010-08-16 FR FR1056617A patent/FR2963833B1/fr not_active Expired - Fee Related
-
2011
- 2011-08-16 US US13/817,405 patent/US20130144535A1/en not_active Abandoned
- 2011-08-16 WO PCT/FR2011/051918 patent/WO2012022913A1/fr active Application Filing
- 2011-08-16 BR BR112013003306A patent/BR112013003306A2/pt not_active IP Right Cessation
- 2011-08-16 GB GB1301365.1A patent/GB2496331B/en not_active Expired - Fee Related
-
2013
- 2013-03-14 NO NO20130386A patent/NO20130386A1/no not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1052600A (fr) | 1951-03-20 | 1954-01-26 | Strachan & Henshaw Ltd | Dispositif encreur pour presses à imprimer |
EP0317288A2 (fr) * | 1987-11-16 | 1989-05-24 | Western Atlas International, Inc. | Procédé d'extension de la couverture sous-surface latérale dans la mesure sismique verticale |
GB2384053A (en) * | 2002-01-11 | 2003-07-16 | Westerngeco Ltd | Processing of acoustic data to obtain arrival time at receiver from down-going acoustic signal |
GB2436462A (en) * | 2006-03-21 | 2007-09-26 | Westerngeco Seismic Holdings | Methods and apparatus for range selection for positioning marine seismic equipment |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111352156A (zh) * | 2020-03-09 | 2020-06-30 | 吉林大学 | 多次波无关的地震资料自动速度分析方法 |
CN111352156B (zh) * | 2020-03-09 | 2021-09-17 | 吉林大学 | 多次波无关的地震资料自动速度分析方法 |
Also Published As
Publication number | Publication date |
---|---|
US20130144535A1 (en) | 2013-06-06 |
NO20130386A1 (no) | 2013-03-14 |
FR2963833A1 (fr) | 2012-02-17 |
GB2496331A (en) | 2013-05-08 |
GB201301365D0 (en) | 2013-03-13 |
FR2963833B1 (fr) | 2013-05-17 |
GB2496331B (en) | 2016-12-14 |
BR112013003306A2 (pt) | 2016-08-09 |
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