CN105549075B - Ask for the method and device of shallow-layer velocity field - Google Patents
Ask for the method and device of shallow-layer velocity field Download PDFInfo
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- CN105549075B CN105549075B CN201410589005.2A CN201410589005A CN105549075B CN 105549075 B CN105549075 B CN 105549075B CN 201410589005 A CN201410589005 A CN 201410589005A CN 105549075 B CN105549075 B CN 105549075B
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Abstract
The embodiment of the present invention provides a kind of method and device for asking for shallow-layer velocity field.This method includes：The datum static correction amount of geological data is subjected to low-and high-frequency separation；Obtain the value in shot point Relative Floating face and the value in geophone station Relative Floating face；Correcting value of the shot point from earth's surface to floating surface is obtained according to floating surface static correction value, shot point high frequency static correction value and the value in shot point Relative Floating face；Correcting value of the geophone station from earth's surface to floating surface is obtained according to floating surface static correction value, geophone station high frequency static correction value and the value in geophone station Relative Floating face；High-precision shallow-layer velocity field is obtained according to correcting value correction geological data.Each shot point, each geophone station are corrected on corresponding floating surface by the embodiment of the present invention by the correcting value of correcting value and geophone station from earth's surface to floating surface of the shot point from earth's surface to floating surface, recycle first break information to realize shallow-layer velocity modeling by floating surface tomographic inversion technology, improve the precision of shallow-layer velocity field.
Description
Technical field
The present embodiments relate to petroleum exploration seismic data processing technology field, more particularly to one kind to ask for shallow-layer speed
The method and device of field.
Background technology
It is a committed step in process of seismic data processing to ask for seismic velocity, multiple medium points in normal-moveout spectrum be present,
Each medium point is corresponding with seismic velocity, and by All Media point in normal-moveout spectrum, corresponding seismic velocity forms seismic velocity respectively
, the precision of seismic velocity field is the key factor of seismic imaging.
There is clear area in usual shallow-layer normal-moveout spectrum, for the phenomenon, shallow-layer speed is upwardly extended using according to speed trend
Mode make up clear area corresponding to shallow-layer speed.
But larger error be present by the shallow-layer speed that prior art obtains and real shallow-layer speed, cause shallow-layer
Velocity field precision is relatively low.
The content of the invention
The embodiment of the present invention provides a kind of method and device for asking for shallow-layer velocity field, to obtain high-precision shallow-layer speed
.
The one side of the embodiment of the present invention is to provide a kind of method for asking for shallow-layer velocity field, including：
The datum static correction amount of geological data is based on floating surface and carries out low-and high-frequency separation, obtains floating surface static correction
Amount, shot point high frequency static correction value and geophone station high frequency static correction value；
Obtain the value of the relatively described floating surface of shot point and the value of the relatively described floating surface of geophone station；
According to the floating surface static correction value, the shot point high frequency static correction value and the relatively described floating surface of the shot point
Value obtains first correcting value of the shot point from earth's surface to the floating surface；
According to the floating surface static correction value, the geophone station high frequency static correction value and the relatively described floating of the geophone station
The value in face obtains second correcting value of the geophone station from earth's surface to the floating surface；
The earthquake number after the geological data is corrected is corrected according to first correcting value and second correcting value
According to the geological data first break picking after the correction, according to the first arrival progress tomographic inversion acquisition shallow-layer velocity field.
The other side of the embodiment of the present invention is to provide a kind of device for asking for shallow-layer velocity field, including：
Separation module, low-and high-frequency separation is carried out for the datum static correction amount of geological data to be based on into floating surface, is obtained
Floating surface static correction value, shot point high frequency static correction value and geophone station high frequency static correction value；
Acquisition module, for obtaining the value of the relatively described floating surface of shot point and the value of the relatively described floating surface of geophone station；
Processing module, for according to the floating surface static correction value, the shot point high frequency static correction value and the shot point phase
First correcting value of the shot point from earth's surface to the floating surface is obtained to the value of the floating surface；According to the quiet school of the floating surface
The value of positive quantity, the geophone station high frequency static correction value and the relatively described floating surface of the geophone station obtains the geophone station from earth's surface
To the second correcting value of the floating surface；The geological data is corrected according to first correcting value and second correcting value to obtain
Geological data after must correcting, to the geological data first break picking after the correction, carry out tomographic inversion according to the first arrival and obtain
Obtain the shallow-layer velocity field.
The method and device provided in an embodiment of the present invention for asking for shallow-layer velocity field, by shot point from earth's surface to floating surface
Each shot point, each geophone station are corrected on corresponding floating surface by the correcting value of correcting value and geophone station from earth's surface to floating surface, then
Shallow-layer velocity modeling is realized by floating surface tomographic inversion technology using first break information, the first arrival tomographic inversion technology of routine is created
New opplication improves the precision of shallow-layer velocity field in the first arrival tomographic inversion of floating surface.
Brief description of the drawings
Fig. 1 is the method flow diagram provided in an embodiment of the present invention for asking for shallow-layer velocity field；
Fig. 2 is floating surface provided in an embodiment of the present invention and various correcting value schematic diagrames；
Fig. 3 A are the floating surface static correction value schematic diagram for the geological data that another embodiment of the present invention provides；
Fig. 3 B are the shot point high frequency static correction value schematic diagram that another embodiment of the present invention provides；
Fig. 3 C are the geophone station high frequency static correction value schematic diagram that another embodiment of the present invention provides；
Fig. 4 A are the shot position floating surface plan that another embodiment of the present invention provides；
Fig. 4 B are the geophone station position floating surface plan that another embodiment of the present invention provides；
Fig. 5 is that the seismic data big gun that another embodiment of the present invention provides is cautious from earth's surface to floating surface correcting value plan；
Fig. 6 be another embodiment of the present invention provide using big gun, it is cautious from earth's surface be corrected to floating surface after single shot record；
Fig. 7 A are the radiographic density graph model depth inspection and the reliability of the adjustment model analysis chart that another embodiment of the present invention provides；
Fig. 7 B are the shallow-layer velocity field schematic diagram that another embodiment of the present invention provides；
Fig. 8 A are the high-precision shallow-layer velocity field schematic diagram that another embodiment of the present invention provides；
Fig. 8 B are the shallow-layer velocity field schematic diagram that prior art is asked for；
Fig. 9 is the shallow-layer speed that the high-precision shallow-layer velocity field that another embodiment of the present invention provides is asked for prior art
The comparison diagram of field；
Figure 10 A are the CRP gather that the shallow-layer velocity field asked for using prior art carries out migration before stack；
Figure 10 B are that the high-precision shallow-layer velocity field provided using another embodiment of the present invention carries out the anti-altogether of migration before stack
Exit point trace gather.
Figure 11 is the structure drawing of device provided in an embodiment of the present invention for asking for shallow-layer velocity field.
Embodiment
Fig. 1 is the method flow diagram provided in an embodiment of the present invention for asking for shallow-layer velocity field.Fig. 2 carries for the embodiment of the present invention
The floating surface of confession and various correcting value schematic diagrames.It is provided in an embodiment of the present invention ask for shallow-layer velocity field method and step it is as follows：
Step S101, the datum static correction amount of geological data is based on floating surface and carries out low-and high-frequency separation, floated
Face static correction value, shot point high frequency static correction value and geophone station high frequency static correction value；
Determine fixed datum, and using shot point and geophone station elevation information generation floating surface, specially described shot point and
The midpoint of the geophone station line is floating point, and multiple points that float are formed described floating corresponding to multiple shot points and multiple geophone stations
Dynamic face.As shown in Fig. 2 the midpoint C of shot point S and geophone station D lines is floating point, when shot point is multiple, geophone station is also to be multiple
When, the midpoint of any shot point and any geophone station line will form a floating point, and multiple points that float form as shown in Figure 2 float
Dynamic face 30.
The floating surface static correction value is that point is floated corresponding to the shot point and the geophone station relative to fixed datum
Value.As shown in Fig. 2 floating surface static correction value TcmpIt is that point C is floated corresponding to shot point S and geophone station D relative to fixed datum
10 value；The horizontal line for crossing C points is 40, and it is S ' to cross shot point S vertical line with the intersection point of horizontal line 40, and S to S ' is shot point high frequency
Static correction value Tstat-source；The intersection point of the vertical line and horizontal line 40 of crossing geophone station D is D ', and D to D ' is the quiet school of geophone station high frequency
Positive quantity Tstat-detect。
Step S102, the value of the relatively described floating surface of shot point and the value of the relatively described floating surface of geophone station are obtained；
The value of the relatively described floating surface of the shot point was that the vertical line of the shot point is relative with the intersection point of the floating surface
In the half of the value of the fixed datum；The value of the relatively described floating surface of the geophone station was the vertical line of the geophone station
Half with the intersection point of the floating surface relative to the value of the fixed datum.
As shown in Fig. 2 shot point S vertical line and the intersection point of floating surface 30 are S 〞, S 〞 relative to the fixed datum excessively
The half of 10 value is the value T of the relatively described floating surface of shot pointcmp-source.Cross geophone station D vertical line and the friendship of floating surface 30
Point is D 〞, and D 〞 are relative to the value T that the half of the value of the fixed datum 10 is the relatively described floating surface of geophone stationcmp-detect。
Step S103, according to the floating surface static correction value, the shot point high frequency static correction value and the shot point with respect to institute
The value for stating floating surface obtains first correcting value of the shot point from earth's surface to the floating surface；
S to S 〞 are first correcting value T of the shot point from earth's surface to the floating surfaces, the first correcting value Ts=Tcmp/2+
Tstat-source-Tcmp-source, wherein, TcmpRepresent the floating surface static correction value, Tstat-sourceRepresent the quiet school of shot point high frequency
Positive quantity, Tcmp-sourceRepresent the value of the relatively described floating surface of the shot point.
Step S104, according to the floating surface static correction value, the geophone station high frequency static correction value and the geophone station phase
Second correcting value of the geophone station from earth's surface to the floating surface is obtained to the value of the floating surface；
D to D 〞 are second correcting value T of the geophone station from earth's surface to the floating surfaced, the second correcting value Td=Tcmp/2+
Tstat-detect-Tcmp-detect, wherein, TcmpRepresent the floating surface static correction value, Tstat-detectRepresent that the geophone station high frequency is quiet
Correcting value, Tcmp-detectRepresent the value of the relatively described floating surface of the geophone station.
Step S105, after being corrected according to first correcting value and second correcting value correction geological data
Geological data, to the geological data first break picking after the correction, according to the first arrival carry out tomographic inversion obtain it is described shallow
Interval velocity field.
The the first correcting value T obtained according to step S103sThe the second correcting value T obtained with step S104dCorrect the earthquake
Data corrected after geological data, to the geological data first break picking after the correction, chromatographed according to the first arrival
Inverting obtains the high-precision shallow-layer velocity field.
On the basis of the embodiment of the present invention, the shot point high frequency static correction value is the shot point relative to the fixed base
The value in quasi- face subtracts the floating surface static correction value；The geophone station high frequency static correction value is the geophone station relative to described solid
The value for determining reference plane subtracts the floating surface static correction value.
As shown in Fig. 2 shot point high frequency static correction value Tstat-sourceSubtracted for shot point S-phase for the value of fixed datum 10 floating
Dynamic face static correction value Tcmp；Geophone station high frequency static correction value Tstat-detectValue for geophone station D relative to the fixed datum 10
Subtract the floating surface static correction value Tcmp。
Correcting value and geophone station school from earth's surface to floating surface of the embodiment of the present invention by shot point from earth's surface to floating surface
Each shot point, each geophone station are corrected on corresponding floating surface by positive quantity, recycle first break information to pass through floating surface tomographic inversion skill
Art realizes shallow-layer velocity modeling, and the first arrival tomographic inversion technological innovation of routine is applied into the first arrival tomographic inversion in floating surface, carried
The high precision of shallow-layer velocity field.
The present embodiment is carried out using certain actual three dimensional seismic data, and it shares 349 big guns, 2592 geophone stations, obtained
The floating surface static correction value T of the real data as shown in Figure 3Acmp, shot point high frequency static correction value as shown in Figure 3 B
Tstat-source, geophone station high frequency static correction value T as shown in Figure 3 Cstat-detect。
Ask for the value T of the relatively described floating surface of shot pointcmp-sourceWith the value T of the relatively described floating surface of geophone stationcmp-detect,
Obtain the value T of the relatively described floating surface of shot point as shown in Figure 4 Acmp-sourceGeophone station as shown in Figure 4 B is relatively described floating
The value T in dynamic facecmp-detect, and Tcmp-sourceIt was the intersection point of vertical line and the floating surface of shot point relative to the fixed base
The half of the value in quasi- face；Tcmp-detectIt was the intersection point of vertical line and the floating surface of geophone station relative to the fixed reference
The half of the value in face.
Ask for first correcting value T of the shot point from earth's surface to floating surfaces, Ts=Tcmp/2+Tstat-source-Tcmp-source, ask for
Second correcting value T of the geophone station from earth's surface to the floating surfaced, Td=Tcmp/2+Tstat-detect-Tcmp-detect, Fig. 5, which is shown, to be asked
It is the big gun that takes, cautious from earth's surface to floating surface correcting value TsAnd Td。
As shown in fig. 6, apply shot correction amount Ts and detection point calibration based on floating surface in original single-shot geological data
Measure Td, geological data is corrected on floating surface from collection earth's surface.
To the geological data first break picking after correction, the tomographic inversion based on first arrival is carried out, obtains the interval velocity mould of shallow-layer
Type, model depth inspection and the reliability of the adjustment model analysis are carried out according to inverting radiographic density Fig. 7 A to determine the shallow-layer layer of final inverting
Rate pattern such as Fig. 7 B.
As shown in Figure 8 A and 8 B, high-precision shallow-layer velocity field provided in an embodiment of the present invention is asked for than prior art
Shallow-layer velocity field is more rationally accurate.
Fig. 9 is that the comparison diagram that the conventional speeds field determined asks for velocity field with this method is composed based on velocity analysis, deep in figure
Color curve is the shallow-layer speed that this method obtains, and White curves are the speed routinely asked for, it can be seen that the speed that this method is asked for
The blank of earthquake shallow-layer normal-moveout spectrum has been filled up in degree field, and more true and reliable.
As shown in figs. 10 a and 10b, the shallow-layer velocity field asked for compared to prior art carries out the common reflection of migration before stack
Point trace gather, the CRP gather middle-shallow layer that high-precision shallow-layer velocity field provided in an embodiment of the present invention carries out migration before stack are same
Phase axle more focuses on, continuity is more preferable.
Figure 11 is the structure drawing of device provided in an embodiment of the present invention for asking for shallow-layer velocity field.It is provided in an embodiment of the present invention
The handling process for the embodiment of the method offer for asking for shallow-layer velocity field can be performed by asking for the device of shallow-layer velocity field.Such as Figure 11 institutes
Show, asking for the device 110 of shallow-layer velocity field includes separation module 111, acquisition module 112 and processing module 113, wherein, separation
Module 111 is used to the datum static correction amount of geological data being based on floating surface progress low-and high-frequency separation, obtains the quiet school of floating surface
Positive quantity, shot point high frequency static correction value and geophone station high frequency static correction value；Acquisition module 112 is used to obtain the relatively described floating of shot point
The value of the relatively described floating surface of value and geophone station in face；Processing module 113 is used for according to the floating surface static correction value, the big gun
The value of point high frequency static correction value and the relatively described floating surface of the shot point obtains the of the shot point from earth's surface to the floating surface
One correcting value；It is relatively described floating according to the floating surface static correction value, the geophone station high frequency static correction value and the geophone station
The value in dynamic face obtains second correcting value of the geophone station from earth's surface to the floating surface；According to first correcting value and described
Second correcting value corrects the geological data after the geological data is corrected, and the geological data after the correction is picked up just
Extremely, carry out tomographic inversion according to the first arrival and obtain the shallow-layer velocity field.
The midpoint of the shot point and the geophone station line is floating point, more as corresponding to multiple shot points and multiple geophone stations
The individual point that floats forms the floating surface.
The processing module 113 is specifically used for calculating first correcting value and second correcting value, first school
Positive quantity Ts=Tcmp/2+Tstat-source-Tcmp-source, wherein, TcmpRepresent the floating surface static correction value, Tstat-sourceRepresent institute
State shot point high frequency static correction value, Tcmp-sourceRepresent the value of the relatively described floating surface of the shot point；The second correcting value Td=
Tcmp/2+Tstat-detect-Tcmp-detect, wherein, TcmpRepresent the floating surface static correction value, Tstat-detectRepresent the geophone station
High frequency static correction value, Tcmp-detectRepresent the value of the relatively described floating surface of the geophone station.
The floating surface static correction value is that point is floated corresponding to the shot point and the geophone station relative to fixed datum
Value；
The value of the relatively described floating surface of the shot point was that the vertical line of the shot point is relative with the intersection point of the floating surface
In the half of the value of the fixed datum；
The value of the relatively described floating surface of the geophone station was intersection point of the vertical line with the floating surface of the geophone station
Relative to the half of the value of the fixed datum.
The shot point high frequency static correction value is that the shot point subtracts the floating surface relative to the value of the fixed datum
Static correction value；
The geophone station high frequency static correction value is that the geophone station subtracts described float relative to the value of the fixed datum
Dynamic face static correction value.
Correcting value and geophone station school from earth's surface to floating surface of the embodiment of the present invention by shot point from earth's surface to floating surface
Each shot point, each geophone station are corrected on corresponding floating surface by positive quantity, recycle first break information to pass through floating surface tomographic inversion skill
Art realizes shallow-layer velocity modeling, and the first arrival tomographic inversion technological innovation of routine is applied into the first arrival tomographic inversion in floating surface, carried
The high precision of shallow-layer velocity field.
In summary, the embodiment of the present invention by correcting value of the shot point from earth's surface to floating surface and geophone station from earth's surface to floating
Each shot point, each geophone station are corrected on corresponding floating surface by the correcting value in dynamic face, recycle first break information to pass through floating surface layer
Analysis inversion technique realizes shallow-layer velocity modeling, and the first arrival tomographic inversion technological innovation of routine is applied into the first arrival chromatography in floating surface
Inverting, improve the precision of shallow-layer velocity field；In addition, the embodiment of the present invention combines shallow-layer tomographic inversion speed and deep reflex
Both wave velocities advantage, realize and field built based on floating face velocity, filled up SEISMIC VELOCTTY ANALYSIS spectrum blank, obtain finally from
Shallow to deep high-precision velocity field, it is very beneficial for migration before stack processing.
In several embodiments provided by the present invention, it should be understood that disclosed apparatus and method, it can be passed through
Its mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, only
Only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can be tied
Another system is closed or is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed
Mutual coupling or direct-coupling or communication connection can be the INDIRECT COUPLINGs or logical by some interfaces, device or unit
Letter connection, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are causing a computer
It is each that equipment (can be personal computer, server, or network equipment etc.) or processor (processor) perform the present invention
The part steps of embodiment methods described.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
Can be with the medium of store program codes.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each functional module
Division progress for example, in practical application, can be complete by different functional modules by above-mentioned function distribution as needed
Into the internal structure of device being divided into different functional modules, to complete all or part of function described above.On
The specific work process of the device of description is stated, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
- A kind of 1. method for asking for shallow-layer velocity field, it is characterised in that including：The datum static correction amount of geological data is based on floating surface and carries out low-and high-frequency separation, obtains floating surface static correction value, big gun Point high frequency static correction value and geophone station high frequency static correction value；Obtain the value of the relatively described floating surface of shot point and the value of the relatively described floating surface of geophone station；Value according to the floating surface static correction value, the shot point high frequency static correction value and the relatively described floating surface of the shot point obtains Obtain first correcting value of the shot point from earth's surface to the floating surface；According to the floating surface static correction value, the geophone station high frequency static correction value and the relatively described floating surface of the geophone station Value obtains second correcting value of the geophone station from earth's surface to the floating surface；The geological data after the geological data is corrected is corrected according to first correcting value and second correcting value, it is right Geological data first break picking after the correction, carry out tomographic inversion according to the first arrival and obtain the shallow-layer velocity field；The floating surface static correction value is value of the point relative to fixed datum of being floated corresponding to the shot point and the geophone station；The value of the relatively described floating surface of the shot point was the intersection point of vertical line and the floating surface of the shot point relative to institute State the half of the value of fixed datum；The value of the relatively described floating surface of the geophone station was that the vertical line of the geophone station is relative with the intersection point of the floating surface In the half of the value of the fixed datum.
- 2. according to the method for claim 1, it is characterised in that the midpoint of the shot point and the geophone station line is floating Point, multiple points that float form the floating surface corresponding to multiple shot points and multiple geophone stations.
- 3. according to the method for claim 2, it is characterised in that described according to the floating surface static correction value, the shot point The value of high frequency static correction value and the relatively described floating surface of the shot point obtains first of the shot point from earth's surface to the floating surface Correcting value includes：The first correcting value Ts=Tcmp/2+Tstat-source-Tcmp-source, wherein, TcmpThe floating surface static correction value is represented, Tstat-sourceRepresent the shot point high frequency static correction value, Tcmp-sourceRepresent the value of the relatively described floating surface of the shot point；It is described according to the floating surface static correction value, the geophone station high frequency static correction value and the relatively described floating of the geophone station The value in face, which obtains second correcting value of the geophone station from earth's surface to the floating surface, to be included：The second correcting value Td=Tcmp/2+Tstat-detect-Tcmp-detect, wherein, TcmpThe floating surface static correction value is represented, Tstat-detectRepresent the geophone station high frequency static correction value, Tcmp-detectRepresent the value of the relatively described floating surface of the geophone station.
- 4. according to the method for claim 3, it is characterised in that the shot point high frequency static correction value be the shot point relative to The value of the fixed datum subtracts the floating surface static correction value；The geophone station high frequency static correction value is that the geophone station subtracts the floating surface relative to the value of the fixed datum Static correction value.
- A kind of 5. device for asking for shallow-layer velocity field, it is characterised in that including：Separation module, low-and high-frequency separation is carried out for the datum static correction amount of geological data to be based on into floating surface, is floated Face static correction value, shot point high frequency static correction value and geophone station high frequency static correction value；Acquisition module, for obtaining the value of the relatively described floating surface of shot point and the value of the relatively described floating surface of geophone station；Processing module, for according to the relative institute of the floating surface static correction value, the shot point high frequency static correction value and the shot point The value for stating floating surface obtains first correcting value of the shot point from earth's surface to the floating surface；According to the floating surface static correction Amount, the value of the geophone station high frequency static correction value and the relatively described floating surface of the geophone station obtain the geophone station from earth's surface to Second correcting value of the floating surface；The geological data is corrected according to first correcting value and second correcting value to obtain Geological data after correction, to the geological data first break picking after the correction, tomographic inversion acquisition is carried out according to the first arrival The shallow-layer velocity field；The floating surface static correction value is value of the point relative to fixed datum of being floated corresponding to the shot point and the geophone station；The value of the relatively described floating surface of the shot point was the intersection point of vertical line and the floating surface of the shot point relative to institute State the half of the value of fixed datum；The value of the relatively described floating surface of the geophone station was that the vertical line of the geophone station is relative with the intersection point of the floating surface In the half of the value of the fixed datum.
- 6. the device according to claim 5 for asking for shallow-layer velocity field, it is characterised in that the shot point and the geophone station The midpoint of line is floating point, and multiple points that float form the floating surface corresponding to multiple shot points and multiple geophone stations.
- 7. the device according to claim 6 for asking for shallow-layer velocity field, it is characterised in that the processing module is specifically used for Calculate first correcting value and second correcting value, the first correcting value Ts=Tcmp/2+Tstat-source-Tcmp-source, Wherein, TcmpRepresent the floating surface static correction value, Tstat-sourceRepresent the shot point high frequency static correction value, Tcmp-sourceRepresent The value of the relatively described floating surface of the shot point；The second correcting value Td=Tcmp/2+Tstat-detect-Tcmp-detect, wherein, Tcmp Represent the floating surface static correction value, Tstat-detectRepresent the geophone station high frequency static correction value, Tcmp-detectRepresent the inspection The value of the relatively described floating surface of wave point.
- 8. the device according to claim 7 for asking for shallow-layer velocity field, it is characterised in that the shot point high frequency static correction value It is that the shot point subtracts the floating surface static correction value relative to the value of the fixed datum；The geophone station high frequency static correction value is that the geophone station subtracts the floating surface relative to the value of the fixed datum Static correction value.
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