Method for establishing sand dune curve measuring plate and static correction value calculation method and device

Abstract

The invention provides a method for establishing a sand dune curve gauge plate and a static correction value calculation method and device.The method for establishing the sand dune curve gauge plate comprises the steps that the average speed of a weathered layer, the thickness of the weathered layer and the distance between a micro-logging survey point and a mountain of multiple micro-logging in a target area are obtained; fitting the average velocity of the weathered layer and the thickness of the weathered layer of the plurality of micro-logging points to obtain a relation coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and taking the relation coefficient as a compaction degree correlation coefficient of the dune; fitting the correlation coefficients of the distance and the compaction degree between the micro-logging survey point and the mountain to obtain a relational expression of the correlation coefficients of the distance and the compaction degree; and taking the average value of the average velocities of the weathered layers of the plurality of micro-logging wells as an initial velocity, and establishing a sand dune curve gauge plate according to a correlation formula by utilizing the relationship between the initial velocity and the correlation coefficients of the distance and the compaction degree. The method can be used for providing a static correction value with higher precision for seismic data processing, and the seismic data imaging effect is effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of geophysical exploration, and in particular relates to a method for establishing a dune curve measurement plate, a static correction quantity calculation method and a device. Background Art

[0002] A certain area is a wind-formed thick sand dune surface, with a near-surface structure of low-velocity drop thickness of more than 270m. The micro-logging survey results of the wind-formed sand dune area show that the low-velocity drop zone has continuous medium properties. The static correction accuracy of the seismic data processing link directly affects the imaging accuracy of the seismic data. The span of the sand dunes and the low-velocity drop thickness of the sand layer in the mobile dune area are smaller than the span and low-velocity drop thickness of the immovable sand dunes in front of the mountain. The differences between the two in the size of the settled sand particles, the size of the compacted porosity, and the accumulation time are reflected in the differences in the degree of compaction, that is, the individual morphological differences of the continuous medium curves of the low-velocity drop zone of the sand dunes at different locations. The dune curve measurement board can be established through the differences in the degree of compaction and individual morphological differences of the dunes, and the dune curve measurement board can provide static correction for seismic data processing. Summary of the invention

[0003] In order to enrich the method of establishing a sand dune curve measuring board to be applicable to more application scenarios, the present invention proposes a method of establishing a sand dune curve measuring board, comprising:

[0004] In a first aspect, an embodiment of the present invention provides a method for establishing a dune curve measurement board, comprising:

[0005] Obtain the average velocity of the weathering layer, the thickness of the weathering layer, and the distance between the micro-well survey point and the mountain from multiple micro-wells in the target area;

[0006] Fitting the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well logging points to obtain a relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and using the relationship coefficient as a correlation coefficient of the degree of compaction of the sand dunes;

[0007] Fitting the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient to obtain a relationship between the distance and the compaction degree correlation coefficient;

[0008] The average of the average velocities of the weathered layer of the multiple micro-wells is taken as the initial velocity, and the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction is used to establish a dune curve gauge according to the following formula:

[0009] v a =v0×h α(r)

[0010] Among them, v a is the average velocity of the dune weathering layer, v0 is the initial velocity at the survey point, α(r) is the coefficient of variation of the degree of compaction associated with the distance r, and h is the total thickness of the dune weathering layer.

[0011] In an optional embodiment, the fitting of the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well logging points to obtain the relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer includes:

[0012] The average velocity and thickness of the weathered layer of the plurality of micro-well logging points are fitted, and the obtained average velocity and thickness of the weathered layer satisfy the following relationship:

[0013]

[0014] Where h is the thickness of the dune weathering layer, v a is the average velocity of all weathered layers, v'0 is the initial velocity of the weathered layer, and α0 is the coefficient related to the degree of compaction.

[0015] In an optional embodiment, the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient are fitted to obtain a relationship between the distance and the compaction degree correlation coefficient, including:

[0016] The distance between the micro-well logging survey point and the mountain and the correlation coefficient of the compaction degree are fitted to obtain the relationship between the distance between the micro-well logging survey point and the mountain and the compaction degree:

[0017] α(r)=a×r 2 -b×r+c0

[0018] Among them, α(r) is the compaction degree coefficient related to distance, r is the distance of the micro-well survey point from the mountain, and a, b, and c0 are coefficients.

[0019] In a second aspect, an embodiment of the present invention provides a static correction value calculation method, including:

[0020] The above-mentioned dune curve measuring plate is used to obtain the average speed of the low speed reduction zone of the dune, and the correction amount of the low speed reduction zone is calculated;

[0021] The static correction amount is calculated using the low speed reduction band correction amount according to the following formula:

[0022]

[0023] Where T is the static correction value, m / s; T w is the correction value of the low speed drop zone, m / s; τ is the correction value of the well depth or the buried depth of the detector, ms; H d is the datum elevation, m; H g is the elevation of the high-speed top interface, m; V s is the reference surface correction speed, m / s.

[0024] In an optional embodiment, the average speed of the low deceleration zone is obtained by using the dune curve measuring plate, and the correction amount of the low deceleration zone is calculated, including:

[0025] Get the thickness of the low speed reduction zone;

[0026] According to the thickness of the low speed reduction zone, the average speed of the low speed reduction zone is obtained by measuring the compaction dune curve.

[0027] The low speed reduction belt correction amount is calculated according to the following formula:

[0028]

[0029] Wherein, h is the thickness of the low deceleration zone, m, and v is the average velocity of the low deceleration zone, m / s.

[0030] In a third aspect, an embodiment of the present invention provides a device for establishing a sand dune curve measuring board, comprising:

[0031] The parameter acquisition module is used to obtain the average velocity of the weathering layer, the thickness of the weathering layer, and the distance between the micro-well survey point and the mountain in multiple micro-wells in the target area;

[0032] A compaction degree correlation coefficient acquisition module is used to fit the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well measurement points to obtain a relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and use the relationship coefficient as the compaction degree correlation coefficient of the sand dune;

[0033] A relationship building module is used to fit the distance between the micro-well logging survey point and the mountain and the compaction degree correlation coefficient to obtain a relationship between the distance and the compaction degree correlation coefficient;

[0034] The dune curve measurement board establishment module is used to take the average of the average velocities of the weathered layer of the multiple micro-wells as the initial velocity, and use the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction to establish the dune curve measurement board according to the following formula:

[0035] v a =v0×h α(r)

[0036] Among them, v a is the average velocity of the dune weathering layer, v0 is the initial velocity, and α(r) is the coefficient of variation of the degree of compaction related to the distance r.

[0037] In an optional embodiment, the compaction degree correlation coefficient acquisition module is used to fit the average velocity and thickness of the weathered layer of the plurality of micro-well logging points, and the obtained average velocity and thickness of the weathered layer satisfy the following relationship:

[0038]

[0039] Where h is the thickness of the dune weathering layer, v a is the average velocity of all weathered layers, v'0 is the initial velocity of the weathered layer, and α0 is the coefficient related to the degree of compaction.

[0040] In an optional embodiment, the relationship building module is used to fit the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient to obtain the relationship between the distance and the compaction degree correlation coefficient:

[0041] α(r)=a×r 2 -b×r+c0

[0042] Among them, α(r) is the compaction degree coefficient related to distance, r is the distance of the micro-well survey point from the mountain, and a, b, and c0 are coefficients.

[0043] In an optional embodiment, the sand dune curve measurement board establishment module is used to take the average of the average velocities of the weathered layer of the multiple micro-wells as the initial velocity, and use the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction to establish the sand dune curve measurement board according to the following formula:

[0044] v a =v0×h α(r)

[0045] Among them, v a is the average velocity of the dune weathering layer, v0 is the initial velocity, and α(r) is the coefficient of variation of the degree of compaction related to the distance r.

[0046] In a fourth aspect, an embodiment of the present invention provides a static correction amount calculation device, comprising a first calculation module, a second calculation module, and a dune curve measurement board establishment device as described above, wherein:

[0047] The first calculation module is used to obtain the thickness and speed of each layer of the sand dune by using the sand dune curve measurement plate generated by the sand dune curve measurement plate establishment device, and calculate the low speed reduction zone correction amount;

[0048] The second calculation module is used to calculate the static correction amount using the obtained low speed reduction band correction amount according to the following formula:

[0049]

[0050] Where T is the static correction value, m / s; T w is the correction value of the low speed drop zone, m / s; τ is the correction value of the well depth or the buried depth of the detector, ms; H d is the datum elevation, m; H g is the elevation of the high-speed top interface, m; V s is the reference surface correction speed, m / s.

[0051] In an optional embodiment, the second calculation module is used to obtain the thickness of the low speed reduction zone and the average speed of the low speed reduction zone through the compaction degree dune curve measurement plate;

[0052] The low speed reduction belt correction amount is calculated according to the following formula:

[0053]

[0054] Wherein, h is the thickness of the low deceleration zone, m, and v is the average velocity of the low deceleration zone, m / s.

[0055] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal, the terminal executes the method for establishing a dune curve measurement board as described above.

[0056] In a sixth aspect, an embodiment of the present invention provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal, the terminal executes the static correction value calculation method as described in any one of the above items.

[0057] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0058] The present invention provides a method for establishing a dune curve measurement board. First, the method obtains the average velocity of the weathered layer, the thickness of the weathered layer, and the distance between the micro-well survey point and the mountain of multiple micro-wells in the target area. Then, the average velocity and thickness of the weathered layer of the multiple micro-well survey points are fitted to obtain the relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer. The relationship coefficient is used as the compaction degree correlation coefficient of the dune. Next, the distance between the micro-well survey point and the mountain and the compaction degree correlation coefficient are fitted to obtain the relationship between the distance and the compaction degree correlation coefficient. Finally, the average value of the average velocity of the weathered layer of the multiple micro-wells is used as the initial velocity. The relationship between the initial velocity and the distance and the compaction degree correlation coefficient is used to establish the dune curve measurement board according to the relevant formula. Without increasing the workload of micro-wells, the method uses qualified micro-well survey data in the study area and the regional settlement and compaction degree characteristics of aeolian dunes, implements the change law of survey points at different spatial positions, and establishes a dune curve measurement board that conforms to the characteristics of dune settlement and compaction degree.

[0059] In addition, the established dune curve plate can be used to generate a static correction calculation method, which can provide higher-precision static correction for seismic data processing and effectively improve the imaging effect of seismic data. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 A schematic diagram of a method for establishing a dune curve measurement board provided by an embodiment of the present invention;

[0062] Figure 2 A schematic diagram of a giant wind-generated sand dune provided by an embodiment of the present invention;

[0063] Figure 3 A near-surface structure diagram of a sand dune with a low velocity reduction thickness exceeding 270 m provided by an embodiment of the present invention;

[0064] Figure 4 A relationship diagram between the average velocity of the weathered layer and the thickness of the weathered layer at each micro-well logging point provided in an embodiment of the present invention;

[0065] Figure 5 A relationship diagram between the distance from the mountain to each survey point and the degree of compaction of the sand dunes provided by the polynomial fitting of the embodiment of the present invention;

[0066] Figure 6 A curve measuring plate for the thickness of the weathering layer of the sand dunes and the average velocity of the weathering layer based on the degree of compaction provided in an embodiment of the present invention;

[0067] Figure 7 A schematic diagram of a static correction calculation method provided in an embodiment of the present invention;

[0068] Figure 8 A schematic diagram of calculating a low deceleration band correction amount provided by an embodiment of the present invention;

[0069] Fig. 9 A schematic diagram of the calculation principle of the low speed reduction band correction amount provided by an embodiment of the present invention;

[0070] Fig.10 A conventional dune curve static correction superimposed cross-section diagram provided by an embodiment of the present invention;

[0071] Fig.11 The static correction value stacking section of the dune curve provided by the embodiment of the present invention;

[0072] Fig.12 A schematic diagram of a device for establishing a sand dune curve provided in an embodiment of the present invention;

[0073] Fig.13 A schematic diagram of a static correction value calculation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] The inventors have found that the accuracy of the dune curve measurement plate in the prior art is greatly affected by the number of surface survey points, and the changes in near-surface parameters in different regions are not fully reflected, and the accuracy of the established dune curve is not high. If you want to obtain a higher-precision dune curve, you need to deploy new surface survey points in dune areas of different thicknesses to increase the surface survey results data. However, the construction difficulty, construction period and cost of surface surveys in extremely thick aeolian dune areas are very high. It is unrealistic to increase the number of surface survey points to improve the accuracy of dune curves in such areas. Under the conditions of technical and economic integration, how to utilize the existing qualified micro-logging survey results, without increasing the acquisition costs, to establish a high-precision dune curve that can reflect the surface characteristics of each region and meet the seismic data processing process The high-precision static correction quantity has become a difficult problem that needs to be solved urgently.

[0075] In order to at least partially overcome the problems of the prior art, the inventors have invented a method for establishing a dune curve and a method for calculating static correction through extensive research. In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0076] Embodiment 1

[0077] The embodiment of the present invention provides a method for establishing a dune curve measurement board, such as Figure 1 As shown, it includes steps S110 to S140:

[0078] Step S110, obtaining the average velocity of the weathered layer, the thickness of the weathered layer, and the distance between the micro-well survey point and the mountain of multiple micro-wells in the target area.

[0079] Specifically, the principle of wind-formed thick sand dunes is as follows Figure 2 As shown in the figure, during the formation of sand dunes, the gradual blocking of wind by sand dunes of different heights and the highest mountain effectively weakens the wind speed. Even if the wind speed weakens, it can still carry smaller dust particles across the mountain. The retained sand particles of different sizes gradually settle in the sand dune areas at different distances from the mountain with the change of wind speed, forming mobile sand dunes. The near-surface structure of sand dunes with low velocity reduction thickness exceeding 270m is shown in the figure. Figure 3 As shown in the figure, the line at the top of the figure at the same position as the survey point is the elevation line (dashed line). There are 216 qualified micro-logging wells in the dune area of ​​a certain region. The maximum drilling depth of the micro-logging survey is 250m, and the maximum thickness of the low velocity reduction layer confirmed by the survey is 228.4m. The low velocity reduction layers obtained by the micro-logging survey all have continuous medium characteristics, and the average velocity of the low velocity reduction layer gradually increases with the increase of the low velocity reduction thickness of the dune.

[0080] Step S120, fitting the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well logging points to obtain a relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and using the relationship coefficient as a correlation coefficient of the degree of compaction of the sand dunes.

[0081] Specifically, the average velocity and thickness data of the weathered layer of 216 qualified micro-wells in the study area are fitted to obtain the initial velocity and the value related to the compaction degree of the average velocity and thickness of the weathered layer at each micro-well point. The corresponding relationship function is:

[0082]

[0083] Where: h is the thickness of the weathered layer of the dune, v a is the average velocity of the dune weathering layer, v0 is the initial velocity, and α0 is the coefficient related to the degree of compaction.

[0084] In some embodiments, the initial velocity v0 value of each survey point is between 238 m / s and 318 m / s, and the coefficient α0 value related to the compaction degree is between 0.15 and 0.35.

[0085] The relationship between the average velocity of the weathering layer and the thickness of the weathering layer at each micro-well logging point is obtained by fitting. Figure 4 As shown, the horizontal axis represents the low velocity thickness, and the vertical axis represents the average velocity.

[0086] Step S130, fitting the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient to obtain a relationship between the distance and the compaction degree correlation coefficient.

[0087] The vertical distance data of each survey point from the mountain is obtained by calculation. The vertical distance means the shortest distance from the mountain. Because the direction of the mountain and the plane distribution of the sand dunes are not that the axis of each sand dune is at right angles to the axis of the mountain, the vertical distance between the physical point and the axis of the mountain can better reflect the statistical effect of the wind force.

[0088] The polynomial fitting of the distance of each survey point from the mountain and α0 was used to obtain the relationship between the distance and the degree of dune compaction, as shown in Figure 5 As shown, the corresponding relationship function is:

[0089] α(r)=a×r 2 -b×r+c0

[0090] Where: α(r) is the compaction degree relationship related to the distance, r is the distance of the survey point from the mountain, a, b, c0 are three coefficients. In some embodiments, the distance of the survey point from the mountain and the pressure degree correlation coefficient are substituted into the above relationship function, and the values ​​of the three coefficients a, b, c0 are 3x10-10 , 1x10 -5 , 0.3398.

[0091] Step S140, taking the average of the average velocities of the weathered layer of the plurality of micro-wells as the initial velocity, and using the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction, establishing a dune curve gauge plate according to the following formula:

[0092] v a =v'0×h α(r)

[0093] Among them, v a is the average velocity of the dune weathering layer, v'0 is the initial velocity at the survey point, and α(r) is the coefficient of variation of the degree of compaction associated with the distance r.

[0094] Specifically, h is the total thickness of the weathering layer, which refers to the sum of the low-speed deceleration layers above the high-speed layer.

[0095] Specifically, in some embodiments, the average value of the initial velocity of all survey points is 285 m / s; the value is between 0.15-0.35. Figure 6 As shown, Figure 6 The method is based on the measurement of the thickness of the weathering layer and the average velocity of the weathering layer of the dune based on the degree of compaction. Taking the measurement of the thickness of the weathering layer and the average velocity of the weathering layer of the dune curve as an example, in the past, the measurement of the thickness of the weathering layer and the average velocity of the weathering layer of the dune curve in a certain area only generated one curve. However, the measurement curve of this method is N curves, specifically, N curves of the thickness of the weathering layer and the average velocity of the weathering layer at different distances are generated according to the distance from the mountain, and different dune curves can be obtained at different distances.

[0096] The embodiment of the present invention provides a method for establishing a dune curve measurement board. First, the method obtains the average velocity of the weathered layer, the thickness of the weathered layer, and the distance between the micro-well survey point and the mountain of multiple micro-wells in the target area. Then, the average velocity and thickness of the weathered layer of the multiple micro-wells are fitted to obtain the relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer. The relationship coefficient is used as the compaction degree correlation coefficient of the dune. Next, the distance between the micro-well survey point and the mountain and the compaction degree correlation coefficient are fitted to obtain the relationship between the distance and the compaction degree correlation coefficient. Finally, the average value of the average velocity of the weathered layer of the multiple micro-wells is used as the initial velocity. The relationship between the initial velocity and the distance and the compaction degree correlation coefficient is used to establish the dune curve measurement board according to the relevant formula. Without increasing the workload of micro-wells, the method uses qualified micro-well survey data in the study area and the regional settlement and compaction degree characteristics of aeolian dunes, implements the change law of survey points at different spatial positions, and establishes a dune curve measurement board that conforms to the characteristics of dune settlement and compaction degree.

[0097] Embodiment 2

[0098] In practical applications, the dune curve plate generated in Example 1 can be used to calculate the static correction amount. The static correction amount calculation method can provide a higher-precision static correction amount for seismic data processing, effectively improving the imaging effect of seismic data.

[0099] The embodiment of the present invention provides a method for calculating static correction. Figure 7 As shown, it includes steps S210 to S220:

[0100] Step S210, using the dune curve measuring board to obtain the average speed of the low speed reduction zone, and calculate the correction amount of the low speed reduction zone.

[0101] Specifically, the average speed of the low speed reduction zone and the vertical time of the low speed reduction zone are obtained by using the dune curve measurement board, and the correction amount of the low speed reduction zone is calculated, such as Figure 8 As shown, it includes steps S210' to S230':

[0102] Step S210': Obtain the thickness of the low velocity reduction zone according to the distance between the micro-logging survey point and the mountain.

[0103] Step S220': according to the thickness of the low speed reduction zone, the average speed of the low speed reduction zone is obtained through the compaction degree dune curve measurement plate.

[0104] Step S230': Calculate the low speed reduction band correction amount according to the following formula:

[0105]

[0106] Wherein, h is the thickness of the low deceleration zone, m, and v is the average velocity of the low deceleration zone, m / s.

[0107] Step S220, using the obtained low speed reduction band correction amount, the static correction amount is calculated according to the following formula:

[0108]

[0109] Where T is the static correction value, m / s; T w is the correction value of the low speed drop zone, m / s; τ is the correction value of the well depth or the buried depth of the detector, ms; H d is the datum elevation, m; H g is the elevation of the high-speed top interface, m; V s is the reference surface correction speed, m / s.

[0110] Specifically, in some embodiments, the thickness and velocity of each layer of the sand dune are obtained at each point, and the static correction amount is calculated as . The calculation principle of the low speed reduction zone correction amount can refer to Fig. 9 shown.

[0111] The results of low-speed reduction zone static correction obtained by conventional method and this method are shown in Table 1. It can be seen from Table 1 that this method better retains the surface survey results information of the verification point, and the static correction obtained is more consistent with the verification point. The accuracy of the static correction calculated by the dune curve measurement board established by this method is higher than that of the static correction calculated by the traditional dune curve measurement board. The static correction profile calculated by this method has better imaging effect. The conventional dune curve static correction superposition profile is as follows Fig.10 As shown, the dune curve static correction value superposition section provided by the present invention is as follows Fig.11 As shown, Fig.10 and Fig.11 The arrows marked with numbers in the figure point to the stratigraphic sections. Fig.10 and Fig.11 From the stratum profile pointed by the corresponding arrow in the figure, it can be seen that the dune curve static correction value superimposed profile provided by the present invention can display more strata, indicating that the static correction value profile imaging effect calculated by this method is better.

[0112] Table 1 Comparison of the accuracy of static correction between conventional and this method

[0113]

[0114] The static correction calculation method is generated by using the established dune curve plate. The static correction calculation method can provide higher-precision static correction for seismic data processing and effectively improve the imaging effect of seismic data.

[0115] Embodiment 3

[0116] The embodiment of the present invention provides a device for establishing a sand dune curve, such as Fig.12 As shown, the device comprises:

[0117] The parameter acquisition module 201 is used to obtain the average velocity of the weathering layer, the thickness of the weathering layer, and the distance between the micro-well survey point and the mountain of multiple micro-wells in the target area;

[0118] The compaction degree correlation coefficient acquisition module 202 is used to fit the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well logging points to obtain the relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and use the relationship coefficient as the compaction degree correlation coefficient of the sand dune;

[0119] The relationship formula building module 203 is used to fit the distance between the micro-well logging survey point and the mountain and the compaction degree correlation coefficient to obtain the relationship formula of the distance and the compaction degree correlation coefficient.

[0120] The dune curve measurement board establishment module 204 is used to take the average of the average velocities of the weathered layer of the plurality of micro-logging wells as the initial velocity, and to establish the dune curve measurement board according to the following formula using the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction:

[0121] v a =v0×h α(r)

[0122] Among them, v a is the average velocity of the dune weathering layer, v0 is the initial velocity, and α(r) is the coefficient of variation of the degree of compaction related to the distance r.

[0123] The embodiment of the present invention provides a static correction amount calculation device, such as Fig.13 As shown, the device comprises:

[0124] The first calculation module 205 is used to obtain the thickness and speed of each layer of the sand dune by using the sand dune curve plate generated by the sand dune curve plate building device, and calculate the low speed reduction zone correction amount.

[0125] The second calculation module 206 is used to calculate the static correction amount using the obtained low speed reduction band correction amount according to the following formula:

[0126]

[0127] Where T is the static correction value, m / s; T w is the correction value of the low speed drop zone, m / s; τ is the correction value of the well depth or the buried depth of the detector, ms; H d is the datum elevation, m; H g is the elevation of the high-speed top interface, m; V s is the reference surface correction speed, m / s.

[0128] An embodiment of the present invention provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal, the terminal executes the method for establishing a dune curve measurement board as described above.

[0129] An embodiment of the present invention provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal, the terminal executes the static correction amount calculation method as described above.

[0130] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0131] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is encompassed in a manner similar to the term "including", as explained by "including," used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for establishing a dune curve measurement board, It is characterized in that The following steps are involved: Obtain the average velocity of the weathering layer, the thickness of the weathering layer, and the distance between the micro-well survey point and the mountain from multiple micro-wells in the target area; Fitting the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well logging points to obtain a relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and using the relationship coefficient as a correlation coefficient of the degree of compaction of the sand dunes; Fitting the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient to obtain a relationship between the distance and the compaction degree correlation coefficient; The average of the average velocities of the weathered layer of the multiple micro-logging wells is taken as the initial velocity, and the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction is used to establish a dune curve gauge according to the following formula: v a =v 0 ×h α(r) Among them, v a is the average velocity of the dune weathering layer, v 0 is the initial velocity of the survey point, α(r) is the coefficient of variation of compaction degree related to the distance r, and h is the total thickness of the dune weathering layer.

2. The method according to claim 1, It is characterized in that The fitting of the average velocity of the weathered layer and the thickness of the weathered layer of the plurality of micro-well logging points to obtain the relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer includes: The average velocity and thickness of the weathered layer of the plurality of micro-well logging points are fitted, and the obtained average velocity and thickness of the weathered layer satisfy the following relationship: Where h is the thickness of the dune weathering layer, v a is the average velocity of all weathering layers, v' 0 is the initial velocity of the weathering layer, α 0 is the coefficient related to the degree of compaction.

3. The method according to claim 1, It is characterized in that The fitting of the distance between the micro-logging survey point and the mountain and the compaction degree correlation coefficient to obtain the relationship between the distance and the compaction degree correlation coefficient includes: The distance between the micro-well logging survey point and the mountain and the correlation coefficient of the compaction degree are fitted to obtain the relationship between the distance between the micro-well logging survey point and the mountain and the compaction degree: α(r)=a×r 2 -b×r+c 0 Among them, α(r) is the compaction degree coefficient related to distance, r is the distance from the micro-well survey point to the mountain, and a, b, and c0 are coefficients.

4. A method for calculating static correction, It is characterized in that include: Using the dune curve measuring board as claimed in any one of claims 1 to 3 to obtain the average speed of the low speed reduction zone, and calculate the correction amount of the low speed reduction zone; The static correction amount is calculated using the low speed reduction band correction amount according to the following formula: Where, T is the static correction value; T w is the correction value for the low speed drop zone; τ is the correction value for the well depth or the buried depth of the detector; H d is the datum elevation; H g is the elevation of the high-speed top interface; V s Correct the speed for the reference surface.

5. The static correction calculation method according to claim 4, It is characterized in that The average speed of the low speed reduction zone is obtained by using the sand dune curve measuring plate, and the correction amount of the low speed reduction zone is calculated, including: Get the thickness of the low speed reduction zone; According to the thickness of the low speed reduction zone, the average speed of the low speed reduction zone is obtained by measuring the compaction degree of the sand dune curve; Calculate the low speed reduction correction amount according to the following formula: Among them, h is the thickness of the low speed reduction zone, and v is the average speed of the low speed reduction zone.

6. A device for establishing a sand dune curve measuring board, It is characterized in that include: The parameter acquisition module is used to obtain the average velocity of the weathering layer, the thickness of the weathering layer, and the distance between the micro-well survey point and the mountain in multiple micro-wells in the target area; A compaction degree correlation coefficient acquisition module is used to fit the average velocity of the weathered layer and the thickness of the weathered layer at the plurality of micro-well points to obtain a relationship coefficient between the average velocity of the weathered layer and the thickness of the weathered layer, and use the relationship coefficient as the compaction degree correlation coefficient of the sand dune; A relationship building module is used to fit the distance between the micro-well logging survey point and the mountain and the compaction degree correlation coefficient to obtain a relationship between the distance and the compaction degree correlation coefficient; The dune curve measurement board establishment module is used to take the average of the average velocities of the weathered layer of the multiple micro-wells as the initial velocity, and use the relationship between the initial velocity and the correlation coefficient between the distance and the degree of compaction to establish the dune curve measurement board according to the following formula: v a =v 0 ×h α(r) Among them, v a is the average velocity of the dune weathering layer, v 0 is the initial velocity, and α(r) is the coefficient of variation of compaction degree related to the distance r.

7. The device for establishing a sand dune curve measuring board according to claim 6, It is characterized in that The compaction degree correlation coefficient acquisition module is used to fit the average velocity and thickness of the weathered layer of the plurality of micro-well logging points, and the obtained average velocity and thickness of the weathered layer satisfy the following relationship: Where h is the thickness of the dune weathering layer, v a is the average velocity of all weathering layers, v' 0 is the initial velocity of the weathering layer, α 0 is the coefficient related to the degree of compaction.

8. The sand dune curve measuring board establishment device according to claim 6, It is characterized in that The relationship building module is used to fit the distance between the micro-well logging survey point and the mountain and the compaction degree correlation coefficient to obtain the relationship between the distance and the compaction degree correlation coefficient: α(r)=a×r 2 -b×r+c 0 Among them, α(r) is the compaction degree coefficient related to distance, r is the distance from the micro-well survey point to the mountain, and a, b, and c0 are coefficients.

9. The device for establishing a sand dune curve measuring board according to claim 6, It is characterized in that The sand dune curve measurement board establishment module is used to take the average of the average velocities of the weathered layer of the multiple micro-wells as the initial velocity, and use the relationship between the initial velocity and the distance and compaction degree correlation coefficient to establish the sand dune curve measurement board according to the following formula: v a =v 0 ×h α(r) Among them, v a is the average velocity of the dune weathering layer, v 0 is the initial velocity, and α(r) is the coefficient of variation of compaction degree related to the distance r.

10. A static correction calculation device, It is characterized in that The method comprises a first calculation module, a second calculation module and a dune curve measurement board establishment device as claimed in any one of claims 6 to 9, wherein: The first calculation module is used to obtain the thickness and speed of each layer of the sand dune by using the sand dune curve measurement plate generated by the sand dune curve measurement plate establishment device, and calculate the low speed reduction zone correction amount; The second calculation module is used to calculate the static correction amount using the obtained low speed reduction band correction amount according to the following formula: Where, T is the static correction value; T w is the correction value for the low speed drop zone; τ is the correction value for the well depth or the buried depth of the detector; H d is the datum elevation; H g is the elevation of the high-speed top interface; V s Correct the speed for the reference surface.

11. The static correction amount calculation device according to claim 10, It is characterized in that The second calculation module is used to obtain the thickness of the low speed reduction zone and the average speed of the low speed reduction zone through the compaction degree dune curve measurement plate; Calculate the low speed reduction correction amount according to the following formula: Among them, h is the thickness of the low speed reduction zone, and v is the average speed of the low speed reduction zone.

12. A computer-readable storage medium storing instructions, which, when executed on a terminal, enable the terminal to execute the method for establishing a sand dune curve measuring board according to any one of claims 1 to 3.

13. A computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed on a terminal, the terminal executes the static correction amount calculation method according to any one of claims 4 or 5.

Images