Oil and gas well earthquake calibration method, control device, storage medium and equipment

Abstract

The invention provides an oil and gas well earthquake calibration method, a control device, a storage medium and equipment, and belongs to the technical field of exploration. The method comprises the following steps: determining a reflection coefficient sequence of a to-be-calibrated well according to well data of the to-be-calibrated well; carrying out convolution on the reflection coefficient sequence and the seismic wavelets to obtain a synthetic recording channel; the seismic wavelets are extracted from well-side seismic data of the well to be calibrated; based on the relationship between the geologic body stratigraphic framework and the third-level and fourth-level seismic sequence interfaces, repeatedly adjusting the positions of the third-level and fourth-level seismic sequence interfaces of the synthetic recording channel until the vertical thicknesses of the third-level and fourth-level seismic sequence interfaces of the synthetic recording channel are consistent with the thickness of the geologic body stratigraphic framework, and completing the calibration of the geologic framework; and the time position of the synthetic recording channel is repeatedly adjusted until the wave group number, the waveform, the amplitude, the frequency and the phase characteristics of the synthetic recording channel are maximally related to the seismic channel beside the well to be calibrated, and sand layer group calibration is completed. According to the embodiment of the invention, accurate oil-gas well earthquake calibration can be completed.

Description

Technical Field

[0001] The present invention relates to the field of exploration technology, and in particular to a seismic calibration method, a control device, a storage medium and equipment. Background Art

[0002] In the early stage of oil and gas field exploration and development, usually one high-position exploration well is drilled in a block, and the well pattern of surrounding production wells is irregular. In addition, although the logging data of the exploration well is relatively complete, there is no sonic curve for the production well, only the gamma curve, density curve and resistivity curve while drilling, and the well control degree in the block is very low.

[0003] Due to the constraints of production measures and development costs, offshore oil and gas strata are basically developed and produced using high-angle wells. Therefore, it is necessary to adjust the seismic formation calibration in a timely manner during the drilling process to ensure that the drilling error is controlled within a very small range.

[0004] The existing well seismic calibration method uses the existing acoustic wave curve of the well to convert it into the velocity of the well to obtain a more accurate well depth-time relationship, or under the condition of dense well network, the single well depth-time relationship is established by the seismic geological layer model. At present, there is no well seismic calibration method for high-angle wells without acoustic wave curves under the condition of few wells. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide an oil and gas well seismic calibration method, a control device, a storage medium and equipment. The embodiments of the present invention can solve or partially solve the problems existing in the prior art.

[0006] In order to achieve the above object, an embodiment of the present invention provides a method for seismic calibration of oil and gas wells, the seismic calibration method comprising:

[0007] Determine the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated;

[0008] Convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated;

[0009] Based on the relationship between the stratigraphic framework of the geological body and the interfaces of the third-order and fourth-order seismic sequences, the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record traces are repeatedly adjusted until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record traces is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework;

[0010] The time position of the synthetic recording track is repeatedly adjusted until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording track are maximally correlated with the wellside seismic track of the well to be calibrated, thereby completing the sand layer group calibration.

[0011] Optionally, the seismic wavelet is a Ricker wavelet and / or a bandpass wavelet.

[0012] Optionally, the seismic calibration method further comprises: establishing a relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces;

[0013] The establishment of the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces includes:

[0014] The reflection mechanism of lithologic combination is analyzed at the interface of third- and fourth-order seismic sequences. Discrete synthetic records are made according to the adjacent wells with acoustic wave curves, and the seismic response of the target lithologic combination is obtained by fold decomposition.

[0015] According to the influence of reflection coefficient and wavelet on the seismic response, the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces is established.

[0016] Optionally, the well data includes density while drilling;

[0017] Determining the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated includes:

[0018] Calculate the speed to be drilled based on the density while drilling;

[0019] The impedance curve is obtained by multiplying the drilling speed and the density while drilling;

[0020] The impedance curve is subjected to depth-time conversion to obtain a reflection coefficient sequence of the well to be calibrated.

[0021] Optionally, the calculating the drilling speed according to the while-drilling density includes:

[0022] The drilling speed is calculated by the following formula:

[0023] V=(ρ / k1)m

[0024] Where ρ is the density while drilling; V is the velocity to be drilled; k1 is the first proportional coefficient; and m is a constant.

[0025] Optionally, the thickness of the geological body stratigraphic framework is obtained by:

[0026] According to the natural gamma curve, resistivity curve characteristics and logging lithology characteristics of the well to be calibrated, the geological sequence stratification interface is determined, and the stratigraphic framework thickness of the geological body is calculated from the top and bottom interface differences.

[0027] Optionally, the vertical thickness of the third-order and fourth-order seismic sequence interfaces of the synthetic trace is obtained by:

[0028] According to the seismic calibration of the calibrated wells in the neighboring area, the seismic interface of the well to be calibrated is identified;

[0029] According to the amplitude energy and fault distance of the seismic interface event axis of the well to be calibrated, the reflection characteristics are traced to the well area to be calibrated to obtain the time thickness of the sequence interface framework;

[0030] Pick the velocity spectrum by seismic processing, pick the top and bottom velocities of the frame and take the average value as the stratum frame velocity of the geological body;

[0031] The vertical thickness of the third-order and fourth-order seismic sequence interfaces is obtained by multiplying the second proportional coefficient k2, the earthquake two-way travel time, and the geological body stratigraphic framework velocity, where the second proportional coefficient k2 is 0.5.

[0032] Correspondingly, an embodiment of the present invention also provides a control device for seismic calibration, the control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to implement the seismic calibration method.

[0033] Correspondingly, an embodiment of the present invention further provides a machine-readable storage medium, on which instructions are stored, and the instructions enable a machine to execute the seismic calibration method.

[0034] Correspondingly, an embodiment of the present invention also provides a device for seismic calibration, which includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the seismic calibration method.

[0035] In the embodiment of the present invention, a synthetic record is obtained by convolving a reflection coefficient sequence of a well to be calibrated with a seismic wavelet, and then based on the relationship between the stratigraphic framework of a geological body and the interfaces of the third-order and fourth-order seismic sequences, the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record are repeatedly adjusted until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record is consistent with the thickness of the stratigraphic framework of the geological body, and the calibration of the geological framework is completed; the time position of the synthetic record is repeatedly adjusted until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic record are maximally correlated with the wellside seismic trace of the well to be calibrated, and the calibration of the sand layer group is completed, so that the accurate calibration of the geological interface and the seismic interface is completed when there is no acoustic wave curve in the production well, only the gamma curve, density curve and resistivity curve while drilling, and the well control degree in the block is very low, providing important basis and guidance for clarifying the reliability of seismic interpretation of the production layer, well drilling deployment and subsequent resource potential evaluation.

[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0038] Figure 1 is a flow chart of a method for seismic calibration of oil and gas wells provided by an embodiment of the present invention;

[0039] Figure 2 is a flow chart of a method for seismic calibration of oil and gas wells provided by another embodiment of the present invention;

[0040] Figure 3 is a flow chart of a method for seismic calibration of oil and gas wells provided by another embodiment of the present invention;

[0041] Figure 4 is a flow chart of a method for seismic calibration of oil and gas wells provided by another embodiment of the present invention;

[0042] Figure 5 is a flow chart of a method for seismic calibration of oil and gas wells provided by another embodiment of the present invention;

[0043] Figure 6 It is a flow chart of a method for seismic calibration of oil and gas wells provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0044] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0045] Figure 1 It is a flow chart of a method for seismic calibration of oil and gas wells provided by an embodiment of the present invention;

[0046] like Figure 1 As shown, the oil and gas well seismic calibration method comprises:

[0047] S110: determining a reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated;

[0048] In step S110, when determining the reflection coefficient sequence of the well to be calibrated based on the well data of the well to be calibrated, optionally, the speed of the well to be drilled can be calculated based on the while drilling density, and the impedance curve is obtained by multiplying the speed of the well to be drilled with the while drilling density, and the impedance curve is depth-time converted to obtain the reflection coefficient sequence of the well to be calibrated.

[0049] For example, the velocity of the well to be drilled is calculated by the following formula: V = (ρ / k1) m, where ρ is the density while drilling; V is the velocity to be drilled; k1 is the first proportional coefficient; and m is a constant. Then the velocity to be drilled is multiplied by the density while drilling to obtain an impedance curve, and the impedance curve is depth-time converted to obtain a reflection coefficient sequence of the well to be calibrated. Among them, k can be 0.31 and m can be 0.25.

[0050] S120: convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated;

[0051] The embodiment of the present invention artificially excites seismic waves near the surface in a certain manner to generate vibration signals called seismic wavelets. Then, seismic wavelets from interfaces with different reflection depths arrive at the surface at different times. A receiving device called a detector is arranged on the surface to receive seismic wavelets reflected from geological interfaces at different depths. The collection of received signals is the synthetic record track. The synthetic record track is the convolution of the seismic wavelet and a series of reflection coefficient sequences. As an intermediate medium for converting geological models into seismic information, the accuracy of the synthetic record track directly affects the accurate calibration of seismic geological layers.

[0052] Optionally, the reflection coefficient sequence can be convolved with the seismic wavelet to obtain a synthetic trace using the following formula:

[0053] S(t)=R(t)·W(t)

[0054] Wherein, S(t) represents a synthetic record trace, R(t) represents a reflection coefficient sequence, and W(t) represents a seismic wavelet, which includes but is not limited to a Ricker wavelet or a bandpass wavelet.

[0055] S130: Based on the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces, repeatedly adjusting the positions of the third-order and fourth-order seismic sequence interfaces of the synthetic record trace until the vertical thickness of the third-order and fourth-order seismic sequence interfaces of the synthetic record trace is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework;

[0056] The thickness of the geological body stratigraphic framework can be obtained by:

[0057] According to the natural gamma curve, resistivity curve characteristics and logging lithology characteristics of the well to be calibrated, the geological sequence stratification interface is determined, and the stratigraphic framework thickness of the geological body is calculated from the top and bottom interface differences.

[0058] Furthermore, the vertical thickness of the third-order and fourth-order seismic sequence interfaces of the synthetic trace is obtained by the following method:

[0059] According to the seismic calibration of the calibrated wells in the neighboring area, the seismic interface of the well to be calibrated is identified;

[0060] According to the amplitude energy and fault distance of the seismic interface event axis of the well to be calibrated, the reflection characteristics are traced to the well area to be calibrated to obtain the time thickness of the sequence interface framework;

[0061] Pick the velocity spectrum by seismic processing, pick the top and bottom velocities of the frame and take the average value as the stratum frame velocity of the geological body;

[0062] The vertical thickness of the third-order and fourth-order seismic sequence interfaces is obtained by multiplying the second proportional coefficient k2, the earthquake two-way travel time, and the geological body stratigraphic framework velocity, where the second proportional coefficient k2 is 0.5.

[0063] When calibrating the geological framework, it is necessary to repeatedly adjust the position of the third-order and fourth-order seismic sequence interface of the synthetic record track until the vertical thickness of the third-order and fourth-order seismic sequence interface of the synthetic record track is consistent with the thickness of the geological body stratigraphic framework, thereby completing the geological framework calibration.

[0064] S140: Repeatedly adjust the time position of the synthetic recording trace until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording trace are maximally correlated with the wellside seismic trace of the well to be calibrated, and the sand layer group calibration is completed.

[0065] On the basis of completing the geological framework calibration, the time position of the synthetic recording track is repeatedly adjusted until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording track are maximally correlated with the wellside seismic track of the well to be calibrated, thereby completing the sand layer group calibration.

[0066] Optionally, the average sub-wave can be re-extracted, and the sub-wave frequency is ensured to be concentrated and the phase is stable. Within the third- and fourth-level seismic sequence interfaces, the reflection characteristics of the sand groups inside the framework are identified as seismic peaks or troughs, and the corresponding relationship between the number of wave groups, waveforms, amplitudes, frequencies and phase characteristics of the synthetic record traces and the seismic traces near the well is compared. The synthetic record traces are repeatedly adjusted until they reach the maximum correlation with the seismic traces near the well, and the sand layer group calibration is completed.

[0067] In the embodiment of the present invention, a synthetic record is obtained by convolving a reflection coefficient sequence of a well to be calibrated with a seismic wavelet, and then based on the relationship between the stratigraphic framework of a geological body and the interfaces of the third-order and fourth-order seismic sequences, the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record are repeatedly adjusted until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record is consistent with the thickness of the stratigraphic framework of the geological body, and the calibration of the geological framework is completed; the time position of the synthetic record is repeatedly adjusted until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic record are maximally correlated with the wellside seismic trace of the well to be calibrated, and the calibration of the sand layer group is completed, so that the accurate calibration of the geological interface and the seismic interface is completed when there is no acoustic wave curve in the production well, only the gamma curve, density curve and resistivity curve while drilling, and the well control degree in the block is very low, providing important basis and guidance for clarifying the reliability of seismic interpretation of the production layer, well drilling deployment and subsequent resource potential evaluation.

[0068] In a preferred embodiment, Figure 2 As shown, the oil and gas well seismic calibration method also includes the step of establishing the relationship between the geological body stratigraphic framework and the third-order and fourth-order seismic sequence interfaces:

[0069] S210: determining a reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated;

[0070] S220: Convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated;

[0071] S230: Establish the relationship between the stratigraphic framework of the geological body and the interfaces of the third and fourth order seismic sequences; optionally, perform a reflection mechanism analysis of the lithologic combination at the interfaces of the third and fourth order seismic sequences, make discrete synthetic records based on the adjacent wells with acoustic wave curves, and obtain the seismic response of the target lithologic combination by fold decomposition; establish the relationship between the stratigraphic framework of the geological body and the interfaces of the third and fourth order seismic sequences based on the influence of the reflection coefficient and the wavelet on the seismic response.

[0072] S240: Based on the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces, repeatedly adjusting the positions of the third-order and fourth-order seismic sequence interfaces of the synthetic record trace until the vertical thickness of the third-order and fourth-order seismic sequence interfaces of the synthetic record trace is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework;

[0073] S250: Repeatedly adjust the time position of the synthetic recording track until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording track are maximally correlated with the wellside seismic track of the well to be calibrated, and the sand layer group calibration is completed.

[0074] The embodiment of the present invention analyzes the reflection mechanism of lithologic combinations at the interfaces of third-order and fourth-order seismic sequences, produces discrete synthetic records based on adjacent wells with acoustic wave curves, obtains the seismic response of the target lithologic combination by fold decomposition, and then establishes the relationship between the stratigraphic framework of the geological body and the interfaces of third-order and fourth-order seismic sequences based on the influence of reflection coefficients and wavelets on the seismic response, thereby providing support for the calibration of the geological framework and the calibration of the sand layer group.

[0075] In another preferred embodiment, Figure 3 As shown, the oil and gas well seismic calibration method may further include a well seismic calibration accuracy analysis step after the calibration is completed:

[0076] S310: Determine the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated;

[0077] S320: Convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated;

[0078] S330: Based on the relationship between the stratigraphic framework of the geological body and the interfaces of the third-order and fourth-order seismic sequences, repeatedly adjusting the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record trace until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record trace is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework;

[0079] S340: repeatedly adjusting the time position of the synthetic recording trace until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording trace are maximally correlated with the wellside seismic trace of the well to be calibrated, and the sand layer group calibration is completed;

[0080] S350: If the number of event axes and energy intensity of the extracted wellside seismic traces and synthetic record traces are highly matched and the correlation coefficient is close to 1, the calibration is accurate; if the reflection continuity characteristics of the sand bodies in the same target layer of the exploration well are compared and the interface characteristics are consistent, the calibration is accurate;

[0081] The embodiment of the present invention can further improve the accuracy of well seismic calibration by extracting and comparing the number of event axes of the wellside seismic trace and the synthetic record trace, the matching degree of energy intensity, and comparing the reflection continuity characteristics of the sand body of the same target layer in the exploration well and whether the interface characteristics are consistent.

[0082] In another preferred embodiment, Figure 4 As shown, the oil and gas well seismic calibration method may further include a step of analyzing the rationality of the well seismic calibration after the calibration is completed: including:

[0083] S410: Determine the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated;

[0084] S420: Convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated;

[0085] S430: Based on the relationship between the stratigraphic framework of the geological body and the interfaces of the third-order and fourth-order seismic sequences, repeatedly adjusting the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record trace until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record trace is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework;

[0086] S440: repeatedly adjusting the time position of the synthetic recording trace until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording trace are maximally correlated with the wellside seismic trace of the well to be calibrated, thereby completing the sand layer group calibration;

[0087] S450: Determine the seismic wave group reflection corresponding to the target production reservoir, track its spatial distribution range according to the amplitude, frequency, phase and energy characteristics, determine the reliability of the scale in combination with production dynamics, and verify that the calibration is reasonable.

[0088] The embodiment of the present invention first determines the seismic wave group reflection corresponding to the target production reservoir, and then tracks its spatial distribution range according to the amplitude, frequency, phase and energy characteristics, as well as the reliability of the scale determined by production dynamics, verifies the rationality of the calibration, and can further improve the rationality of the calibration.

[0089] In another specific embodiment, Figure 5 and Figure 6 It is a flow chart of a method for seismic calibration of oil and gas wells provided in an embodiment of the present invention. On the basis of the lithology curve of the logging data, the density curve to velocity curve and the three-level sequence framework, the synthetic record result of the preliminary calibration can be obtained. Then, on the basis of the time and depth of the initial calibration, the accurate time-depth relationship can be obtained, thereby completing the seismic calibration of the oil and gas wells.

[0090] Correspondingly, an embodiment of the present invention also provides a control device for seismic calibration, the control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to implement the seismic calibration method.

[0091] Correspondingly, an embodiment of the present invention further provides a machine-readable storage medium, on which instructions are stored, and the instructions enable a machine to execute the seismic calibration method.

[0092] Correspondingly, an embodiment of the present invention also provides a device for seismic calibration, which includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the seismic calibration method.

[0093] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0094] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0095] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0096] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0097] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0098] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0099] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0100] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0101] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for seismic calibration of oil and gas wells, characterized in that: The seismic calibration method comprises: Determine the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated; Convolving the reflection coefficient sequence with the seismic wavelet to obtain a synthetic record trace; wherein the seismic wavelet is extracted from the seismic data near the well to be calibrated; Based on the relationship between the stratigraphic framework of the geological body and the interfaces of the third-order and fourth-order seismic sequences, the positions of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record traces are repeatedly adjusted until the vertical thickness of the interfaces of the third-order and fourth-order seismic sequences of the synthetic record traces is consistent with the thickness of the stratigraphic framework of the geological body, thereby completing the calibration of the geological framework; The time position of the synthetic recording track is repeatedly adjusted until the wave group number, waveform, amplitude, frequency and phase characteristics of the synthetic recording track are maximally correlated with the wellside seismic track of the well to be calibrated, thereby completing the sand layer group calibration.

2. The earthquake calibration method according to claim 1, characterized in that: The seismic wavelet is a Ricker wavelet and / or a bandpass wavelet.

3. The earthquake calibration method according to claim 1 or 2, characterized in that: The seismic calibration method further includes: establishing the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces; The establishment of the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces includes: The reflection mechanism of lithologic combination is analyzed at the interface of third-order and fourth-order seismic sequences. Discrete synthetic records are made according to the adjacent wells with acoustic wave curves, and the seismic response of the target lithologic combination is obtained by fold decomposition. According to the influence of reflection coefficient and wavelet on the seismic response, the relationship between the stratigraphic framework of the geological body and the third-order and fourth-order seismic sequence interfaces is established.

4. The earthquake calibration method according to claim 3, characterized in that: The well data include density while drilling; Determining the reflection coefficient sequence of the well to be calibrated according to the well data of the well to be calibrated includes: Calculate the speed to be drilled based on the density while drilling; The impedance curve is obtained by multiplying the drilling speed and the density while drilling; The impedance curve is subjected to depth-time conversion to obtain a reflection coefficient sequence of the well to be calibrated.

5. The earthquake calibration method according to claim 4, characterized in that: The method of calculating the drilling speed according to the while drilling density includes: The drilling speed is calculated by the following formula: V=(ρ / k1)m Where ρ is the density while drilling; V is the velocity to be drilled; k1 is the first proportional coefficient; and m is a constant.

6. The earthquake calibration method according to claim 1, characterized in that: The thickness of the geological body stratigraphic framework is obtained by: According to the natural gamma curve, resistivity curve characteristics and logging lithology characteristics of the well to be calibrated, the geological sequence stratification interface is determined, and the stratigraphic framework thickness of the geological body is calculated from the top and bottom interface differences.

7. The earthquake calibration method according to claim 6, characterized in that: The vertical thickness of the third-order and fourth-order seismic sequence interfaces of the synthetic trace is obtained by the following method: According to the seismic calibration of the calibrated wells in the neighboring area, the seismic interface of the well to be calibrated is identified; According to the amplitude energy and fault distance of the seismic interface event axis of the well to be calibrated, the reflection characteristics are traced to the well area to be calibrated to obtain the time thickness of the sequence interface framework; Pick the velocity spectrum by seismic processing, pick the top and bottom velocities of the frame and take the average value as the stratum frame velocity of the geological body; The vertical thickness of the third-order and fourth-order seismic sequence interfaces is obtained by multiplying the second proportional coefficient k2, the earthquake two-way travel time, and the geological body stratigraphic framework velocity, where the second proportional coefficient k2 is 0.

5.

8. A control device for earthquake calibration, characterized in that: The control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the seismic calibration method according to any one of claims 1-7.

9. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, which enable the machine to execute the seismic calibration method according to any one of claims 1-7.

10. A device for earthquake calibration, characterized in that: The device includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the seismic calibration method described in any one of claims 1-7.

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