Method and device for comprehensively evaluating plugging property of fault block type trap of gas storage

Abstract

The invention provides a gas storage fault block type trap plugging performance comprehensive evaluation method and device, and the method comprises the steps: firstly, carrying out the horizon interpretation of a cover layer and a reservoir layer according to the seismic data of a target gas storage trap, and determining a horizon interpretation result; and performing fracture interpretation on the fault according to the seismic data, and determining a fracture interpretation result. Then, a logging curve used for distinguishing lithology is determined, and the conversion relation between the logging curve and impedance is determined; and secondly, constructing a stratum framework model according to the spatial structure form data of the cap layer and the spatial structure form data of the reservoir layer, performing structure prediction on the cap layer and the reservoir layer through quasi-impedance inversion, and determining an inversion prediction result according to a conversion relation between a logging curve and impedance. And finally, according to the fracture interpretation result and the inversion prediction result, determining a lateral plugging evaluation parameter and a vertical plugging evaluation parameter for evaluating the plugging performance of the target gas storage trap. The method can comprehensively and accurately evaluate the plugging property of the fault block type trap of the gas storage.

Description

Technical Field

[0001] The invention relates to the technical field of gas storage plugging performance evaluation, and in particular to a comprehensive evaluation method and device for the plugging performance of a fault-block type trap of a gas storage. Background Art

[0002] Underground gas storage plays an indispensable role in the modern energy supply system, especially in the natural gas supply chain. Underground gas storage provides an effective means of energy storage and regulation to adapt to seasonal consumption fluctuations, ensure energy supply security, and optimize energy resource allocation. If natural gas escapes or leaks in the gas storage enclosure, it will not only bring safety hazards, but also cause direct economic losses. Therefore, in order to prevent potential environmental risks and safety accidents and ensure the continuity and reliability of energy supply, the need for evaluating the sealing performance of gas storage enclosures for real-time monitoring and risk warning has become increasingly urgent.

[0003] For the evaluation of the sealing property of fault-block traps in gas storage reservoirs, relevant technologies usually rely on the structural interpretation of the fault section developed by the three-dimensional seismic model to form a plane structural map of the fault, carry out impedance inversion with seismic data and logging data to form wave impedance inversion volume data, calibrate with known fault reservoirs, clarify the range of wave impedance difference, calculate the plane distribution map of wave impedance difference along the fault, and clarify the sealing characteristics of the fault in space.

[0004] However, the above-mentioned related technologies have structural limitations, that is, the structural interpretation of three-dimensional seismic data is mainly based on fault sections, and there are defects in the understanding of other geological structures. The structure is incomplete, the identification is not clear, and it has limitations, which makes it impossible to comprehensively and accurately evaluate the sealing capacity of the block-type closure of the gas storage reservoir. Summary of the invention

[0005] The technical problem to be solved by the present invention is that it is impossible to comprehensively and accurately evaluate the plugging performance of the fault-block trap of a gas storage reservoir.

[0006] In order to solve the above technical problems, the present invention provides a comprehensive evaluation method and device for the plugging performance of fault-block traps in gas storage, which specifically adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a comprehensive evaluation method for the sealing performance of a fault-block type trap in a gas storage reservoir, including: First, based on the seismic data of the target gas storage reservoir trap, horizon interpretation is performed on the caprock and reservoir in the target gas storage reservoir trap to determine the horizon interpretation result; the horizon interpretation result includes: the first lithology corresponding to the caprock, the second lithology corresponding to the reservoir, the spatial structural form data of the caprock, and the spatial structural form data of the reservoir. Then, fracture interpretation is performed on the faults in the target gas storage reservoir trap based on the seismic data to determine the fracture interpretation result; the fracture interpretation result is used to characterize the distribution data of the faults and the spatial docking relationship between the caprock and the reservoir. Next, logging curves are determined based on the first lithology and the second lithology, and the conversion relationship between the logging curves and impedance is determined, and the logging curves are used to distinguish the first lithology and the second lithology. Secondly, a stratigraphic framework model of the target gas storage reservoir trap is constructed based on the spatial structural form data of the caprock and the spatial structural form data of the reservoir, and structural prediction of the caprock and the reservoir is performed through pseudo-impedance inversion according to the stratigraphic framework model, and the inversion prediction result is determined according to the conversion relationship between the logging curves and impedance, and the inversion prediction result is used to characterize the spatial structure of the predicted caprock and the spatial structure of the predicted reservoir. Finally, based on the fracture interpretation result and the inversion prediction result, lateral sealing evaluation parameters and vertical sealing evaluation parameters are determined, and the lateral sealing evaluation parameters and the vertical sealing evaluation parameters are used to evaluate the sealing performance of the target gas storage reservoir trap.

[0008] Combined with the first aspect, in an alternative implementation, the above fracture interpretation result includes: the vertical throw of the fault. The inversion prediction result includes: the lateral caprock thickness and the lateral reservoir thickness. The expression of the lateral sealing evaluation parameter is: when L1≤H1 and L1≥H2, A1 = 1. When L1<H1 and L1<H2, when L1>H1 and H1<H2, when L1≥H1 and H1≥H2, when L1>H1 and H1 + H2 - L1≥H2, A1 = -1. In the formula, A1 represents the lateral sealing evaluation parameter, H1 represents the lateral caprock thickness, H2 represents the lateral caprock thickness, and L1 represents the vertical throw of the fault. Among them, the range of the lateral sealing evaluation parameter is: 1 to -1, and the sealing performance of the target gas storage reservoir trap is positively correlated with the magnitude of the lateral sealing evaluation parameter.

[0009] In combination with the first aspect, in an optional implementation, the above-mentioned inversion prediction results include: cap rock formation dip, cap rock formation dip, reservoir formation dip, reservoir formation dip and vertical cap rock apparent thickness. The vertical plugging evaluation parameter is the vertical cap rock thickness, and the expression of the vertical cap rock thickness is: when the cap rock formation dip is the same as the reservoir formation dip, and θ1>θ2, H4=cos(θ1-θ2)·H3. When the cap rock formation dip is the same as the reservoir formation dip, and θ1=θ2, H4=cos(θ1)·H3. When the cap rock formation dip is opposite to the reservoir formation dip, H4=H3. In the formula, H4 represents the vertical cap rock thickness, θ1 represents the cap rock formation dip, θ2 represents the reservoir formation dip, and H3 represents the vertical cap rock apparent thickness. Among them, the plugging property of the target gas storage trap is positively correlated with the size of the vertical cap rock thickness.

[0010] In combination with the first aspect, in an optional implementation, after determining the well logging curve according to the first lithology and the second lithology, and determining the conversion relationship between the well logging curve and the impedance, it also includes: first, determining a pseudo-impedance plate according to the conversion relationship between the well logging curve and the impedance. Then, according to the pseudo-impedance plate, determining the impedance limits corresponding to the strata and lithology in the target gas storage trap, the impedance limits are used to determine the inversion prediction results.

[0011] In combination with the first aspect, in an optional implementation, the cap rock and the reservoir are predicted by pseudo-impedance inversion according to the stratigraphic framework model, and the inversion prediction result is determined according to the conversion relationship between the logging curve and the impedance, including: first, the cap rock and the reservoir are predicted by pseudo-impedance inversion according to the stratigraphic framework model, and the pseudo-impedance data body is determined. Then, the predicted lithology is determined according to the pseudo-impedance data body and the conversion relationship between the logging curve and the impedance. Finally, the spatial structure of the predicted cap rock and the spatial structure of the predicted reservoir are determined according to the predicted lithology to obtain the inversion prediction result.

[0012] In combination with the first aspect, in an optional implementation, the above-mentioned logging curve is: a gamma curve, or an acoustic wave curve, or a density curve.

[0013] In conjunction with the first aspect, in an optional implementation, the spatial structural morphology data of the cap layer includes: top interface structural parameters and bottom interface structural parameters of the cap layer. The spatial structural morphology data of the reservoir layer includes: top interface structural parameters and bottom interface structural parameters of the reservoir layer.

[0014] The comprehensive evaluation method for the plugging performance of fault-block traps in gas storage provided by the present invention has the following beneficial effects:

[0015] 1. This method uses the pseudo-impedance inversion method to invert different layers under the framework constraints of the seismic interpretation results of the cap layer, reservoir layer, and faults, and obtains the lithology through conversion relationship to determine the structure of each layer, which can more accurately determine the spatial contact relationship between the reservoir and cap layer of the gas storage. This lithology characterization method makes full use of the seismic interpretation results, takes into account the structural morphology of the cap layer and reservoir layer, and the influence of faults on the structure. The pseudo-impedance inversion method has a better effect on the identification of the cap layer and reservoir layer. The combination of the two has both the control of seismic structural layers and faults, and the lithology prediction results of pseudo-impedance inversion, which can better reflect the spatial distribution of the reservoir and cap layer of the gas storage.

[0016] 2. This method combines the different contact relationships between the cap rock and the reservoir, establishes the vertical and longitudinal plugging evaluation parameters of the gas storage block trap, and the evaluation results are more comprehensive. This method considers five contact situations between the reservoir and the cap rock in the lateral direction, and three contact situations between the reservoir and the cap rock in the vertical direction, and establishes the lateral and vertical evaluation parameters and limits for each case, which can better meet the needs of the plugging evaluation of the gas storage block trap.

[0017] In summary, the comprehensive evaluation method for the plugging performance of fault-block traps of gas storage reservoirs provided by the present invention can achieve a comprehensive and accurate evaluation of the plugging performance of fault-block traps of gas storage reservoirs.

[0018] In the second aspect, the present invention provides a comprehensive evaluation device for the plugging property of a gas storage fault-block trap, comprising: a stratigraphic interpretation module, a fault interpretation module, a conversion module, a pseudo-impedance inversion module and an evaluation module. The stratigraphic interpretation module is used to perform stratigraphic interpretation on the cap rock and the reservoir rock in the target gas storage trap according to the seismic data of the target gas storage trap, and determine the stratigraphic interpretation result; the stratigraphic interpretation result includes: the first lithology corresponding to the cap rock, the second lithology corresponding to the reservoir rock, the spatial structural morphology data of the cap rock and the spatial structural morphology data of the reservoir rock. The fault interpretation module is used to perform fault interpretation on the fault in the target gas storage trap according to the seismic data, and determine the fault interpretation result; the fault interpretation result is used to characterize the distribution data of the fault and the spatial docking relationship between the cap rock and the reservoir rock. The conversion module is used to determine the well logging curve according to the first lithology and the second lithology, and determine the conversion relationship between the well logging curve and the impedance, and the well logging curve is used to distinguish the first lithology from the second lithology. The quasi-impedance inversion module is used to construct a stratigraphic framework model of the target gas storage reservoir trap based on the spatial structural morphology data of the cap layer and the spatial structural morphology data of the reservoir layer, and to predict the structure of the cap layer and the reservoir layer through quasi-impedance inversion based on the stratigraphic framework model, and to determine the inversion prediction results based on the conversion relationship between the logging curve and the impedance. The inversion prediction results are used to characterize the predicted spatial structure of the cap layer and the predicted spatial structure of the reservoir layer. The evaluation module is used to determine the lateral plugging evaluation parameters and the vertical plugging evaluation parameters based on the fracture interpretation results and the inversion prediction results. The lateral plugging evaluation parameters and the vertical plugging evaluation parameters are used to evaluate the plugging properties of the target gas storage reservoir trap.

[0019] According to a third aspect, an electronic device is provided, comprising: a memory and one or more processors; the memory is coupled to the processor; wherein computer program code is stored in the memory, and the computer program code comprises computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the method according to the first aspect and any one of the optional methods thereof.

[0020] According to a fourth aspect, a computer-readable storage medium is provided, comprising computer instructions. When the computer instructions are executed on an electronic device, the electronic device executes the method according to the first aspect and any optional method thereof.

[0021] It can be understood that the beneficial effects that can be achieved by the comprehensive evaluation device for the plugging performance of block-type closures of gas storage reservoirs provided in the second aspect, the electronic device in the third aspect, and the computer-readable storage medium in the fourth aspect can refer to the beneficial effects in the first aspect and any possible design thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic flow chart of a comprehensive evaluation method for the plugging performance of a fault-block type trap in a gas storage provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the lateral structure of the cap rock and the reservoir provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the vertical structure of the cap rock and reservoir provided in an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the structure of a comprehensive evaluation device for the plugging performance of a fault-block type trap in a gas storage provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0027] Underground gas storage plays an indispensable role in the modern energy supply system, especially in the natural gas supply chain, where it provides an effective means of energy storage and regulation to adapt to seasonal consumption fluctuations, ensure energy supply security, and optimize energy resource allocation. As global energy consumption increases, the reliance on underground gas storage is increasing, and the importance of its safe and stable operation is also increasing.

[0028] If natural gas escapes or leaks in a gas storage enclosure, it will not only bring potential safety hazards, but also cause direct economic losses. Therefore, in order to prevent potential environmental risks and safety accidents and ensure the continuity and reliability of energy supply, the need to evaluate the sealing performance of gas storage enclosures for real-time monitoring and risk warning has become increasingly urgent. In order to evaluate the sealing performance of gas storage enclosures, it is necessary not only to finely characterize the morphology of the gas storage structure, the distribution of faults and the distribution of caprocks, and evaluate its sealing performance, but also to evaluate the possible escape and seepage channels of natural gas, so as to provide a basis for the design of gas storage monitoring programs.

[0029] For the evaluation of the sealing property of fault-block traps in gas storage reservoirs, relevant technologies usually rely on the structural interpretation of the fault section developed by the three-dimensional seismic model to form a plane structural map of the fault, carry out impedance inversion with seismic data and logging data to form wave impedance inversion volume data, calibrate with known fault reservoirs, clarify the range of wave impedance difference, calculate the plane distribution map of wave impedance difference along the fault, and clarify the sealing characteristics of the fault in space.

[0030] However, the above-mentioned related technologies have structural limitations, that is, the structural interpretation of three-dimensional seismic data is mainly based on fault sections, and there are defects in the understanding of other geological structures. The structure is incomplete, the identification is not clear, and it has limitations, which makes it impossible to comprehensively and accurately evaluate the sealing capacity of the block-type closure of the gas storage reservoir.

[0031] In order to solve the above problems, the embodiment of the present application provides a comprehensive evaluation method and device for the sealing performance of the block-type closure of a gas storage reservoir. Under the framework constraints of the results of the seismic interpretation of the cap rock, reservoir rock, and fault, the method uses the pseudo-impedance inversion method to invert different strata respectively, and obtains the lithology body through the conversion relationship conversion, which can more accurately reflect the spatial contact relationship between the reservoir rock and the cap rock of the gas storage reservoir. In combination with the different lateral contact modes of the reservoir rock and the cap rock, and the different vertical contact modes, lateral plugging evaluation parameters and vertical plugging evaluation parameters are established respectively to comprehensively evaluate the plugging performance of the block-type closure of the gas storage reservoir, thereby achieving a comprehensive and accurate evaluation of the plugging performance of the block-type closure of the gas storage reservoir.

[0032] The solution provided by the embodiment of the present application is introduced below in conjunction with the accompanying drawings.

[0033] For details, see Figure 1 , which is a flow chart of a comprehensive evaluation method for the plugging performance of a gas storage fault-block trap provided by an embodiment of the present invention, such as Figure 1 As shown, the comprehensive evaluation method for the plugging performance of fault-block traps of gas storage provided by the present invention comprises the following steps S101-S105:

[0034] S101. Based on the seismic data of the target gas storage trap, perform stratigraphic interpretation on the cap rock and reservoir rock in the target gas storage trap to determine the stratigraphic interpretation result.

[0035] In the embodiment of the present application, firstly, seismic data of the target gas storage trap can be obtained, and the seismic data can be, for example, SEGY data. Then, based on the seismic data, the cap rock and reservoir rock in the target gas storage trap are interpreted in stratigraphic terms, that is, the lithology, structural morphology, thickness distribution and other structural data of the cap rock and reservoir rock are preliminarily determined to obtain stratigraphic interpretation results.

[0036] Specifically, the stratigraphic interpretation results include: a first lithology corresponding to the cap layer, a second lithology corresponding to the reservoir layer, spatial structural morphological data of the cap layer, and spatial structural morphological data of the reservoir layer.

[0037] In some embodiments, the spatial structural morphology data of the cap layer includes: the top interface structural parameters and the bottom interface structural parameters of the cap layer. The spatial structural morphology data of the reservoir layer includes: the top interface structural parameters and the bottom interface structural parameters of the reservoir layer. In this way, according to the spatial structural morphology data of the cap layer and the spatial structural morphology data of the reservoir layer, a stratigraphic framework model of the target gas storage reservoir closure can be constructed for pseudo-impedance inversion.

[0038] S102. Perform fracture interpretation on the faults within the target gas storage trap based on the seismic data and determine the fracture interpretation results.

[0039] Next, the faults in the target gas storage trap can be interpreted in detail based on the seismic data, i.e., fault interpretation, to determine the distribution of faults and the spatial docking relationship between the cap rock and the reservoir, and obtain the fault interpretation results. Among them, the fault interpretation results can be used to characterize the distribution data of faults and the spatial docking relationship between the cap rock and the reservoir.

[0040] S103. Determine a well logging curve according to the first lithology and the second lithology, and determine a conversion relationship between the well logging curve and impedance.

[0041] Further, a well logging curve can be determined according to the first lithology and the second lithology, and the well logging curve is used to distinguish the first lithology and the second lithology. That is, a well logging curve that can accurately and effectively distinguish the cap layer and the reservoir layer is determined according to the first lithology and the second lithology. And the conversion relationship between the well logging curve and the impedance is determined. Among them, the conversion relationship can be, for example, a conversion formula between the well logging curve and the impedance.

[0042] In some embodiments, the logging curve may be a gamma curve, or an acoustic wave curve, or a density curve.

[0043] In some embodiments, after determining the well logging curve according to the first lithology and the second lithology, and determining the conversion relationship between the well logging curve and the impedance, the method further includes:

[0044] Firstly, the pseudo-impedance value is determined according to the conversion relationship between the logging curve and impedance.

[0045] Then, according to the pseudo-impedance plate, the impedance limits corresponding to the strata and lithology in the target gas storage trap are determined, and the impedance limits are used to determine the inversion prediction results.

[0046] For example, taking the first lithology as gypsum and the second lithology as sandstone as an example, through comparative analysis of multiple logging curves, the gamma curve (GR) is more sensitive to the identification of the first lithology (gypsum) and the second lithology (sandstone), and can accurately and effectively distinguish gypsum from sandstone. Next, the conversion relationship between the logging curves and impedance corresponding to the cap layer and the reservoir layer is determined respectively. Specifically, the conversion formula between the logging curve and impedance corresponding to the cap layer is:

[0047] I MP_GR1=37266GR -0.412 ;

[0048] Where I MP_GR1 represents the GR pseudo impedance corresponding to the cap layer, and the unit is: g / cm 3 ×m / s; GR represents the gamma curve, and the unit is: API.

[0049] The conversion formula between the logging curve and impedance corresponding to the reservoir is:

[0050] I MP_GR2=112440GR -0.527 ;

[0051] Where I MP_GR2 represents the GR pseudo-impedance corresponding to the reservoir.

[0052] Furthermore, according to the conversion relationship between the above logging curve and impedance, the pseudo-impedance plate can be determined. Then, the impedance limit corresponding to the stratum and lithology in the target gas storage trap is determined according to the pseudo-impedance plate. Among them, the impedance limit of gypsum is: 7500g / cm 3 ×m / s, the impedance limit of sandstone is: 9500g / cm 3 ×m / s;

[0053] S104. Construct a stratigraphic framework model of the target gas storage trap based on the spatial structural morphology data of the cap layer and the spatial structural morphology data of the reservoir layer, perform structural prediction of the cap layer and the reservoir layer through pseudo-impedance inversion based on the stratigraphic framework model, and determine the inversion prediction result based on the conversion relationship between the logging curve and the impedance.

[0054] Specifically, according to the interpretation of the stratigraphic positions determined in S101: the spatial structural morphological data of the cap layer and the spatial structural morphological data of the reservoir layer can be used to construct the stratigraphic framework model of the target gas storage reservoir closure. Then, based on the stratigraphic framework model, the cap layer and the reservoir layer can be structurally predicted by pseudo-impedance inversion. And according to the conversion relationship between the well logging curve and the impedance, the lithology and the stratum corresponding to the lithology can also be determined in combination with the impedance limits corresponding to the strata and lithology in the target gas storage reservoir closure to obtain the inversion prediction results. Among them, the inversion prediction results are used to characterize the predicted spatial structure of the cap layer and the predicted spatial structure of the reservoir.

[0055] In some embodiments, S104 may specifically include:

[0056] Firstly, the cap rock and reservoir structure are predicted through pseudo-impedance inversion according to the stratigraphic framework model to determine the pseudo-impedance data volume.

[0057] Then, the predicted lithology is determined based on the pseudo-impedance data volume and the conversion relationship between the logging curve and impedance.

[0058] Finally, determine the spatial structure of the predicted caprock and the spatial structure of the predicted reservoir according to the predicted lithology to obtain the inversion prediction result.

[0059] S105. Determine the lateral sealing evaluation parameter and the vertical sealing evaluation parameter according to the fault interpretation result and the inversion prediction result.

[0060] Finally, according to the fault interpretation result determined in S102 and the inversion prediction result determined in S104, the lateral sealing evaluation parameter and the vertical sealing evaluation parameter can be determined for evaluating the sealing property of the target gas storage reservoir trap.

[0061] In some embodiments, the fault interpretation result may include: the vertical throw of the fault. The inversion prediction result may include: the lateral caprock thickness and the lateral reservoir thickness. Figure 2 This is a schematic diagram of the lateral structure of the caprock and the reservoir provided by the embodiment of the present invention. As Figure 2 shown, H1 represents the lateral caprock thickness, H2 represents the lateral caprock thickness, and L1 represents the vertical throw of the fault. Then the expression of the lateral sealing evaluation parameter A1 is:

[0062] As Figure 2 shown in (1) below, when L1 ≤ H1 and L1 ≥ H2. That is, in the case of complete sealing, A1 = 1.

[0063] As Figure 2 shown in (2) below, when L1 < H1 and L1 < H2. That is, in the case of partial sealing,

[0064] As Figure 2 shown in (3) below, when L1 > H1 and H1 < H2. That is, in the case of non-sealing,

[0065] As Figure 2 shown in (4) below, when L1 ≥ H1 and H1 ≥ H2. That is, in the case of non-sealing,

[0066] As Figure 2 shown in (5) below, when L1 > H1 and H1 + H2 - L1 ≥ H2. That is, in the case of complete non-sealing, A1 = -1.

[0067] Among them, the range of the lateral sealing evaluation parameter is: 1 to -1, and the sealing property of the target gas storage reservoir trap is positively correlated with the magnitude of the lateral sealing evaluation parameter. Specifically, when the lateral sealing evaluation parameter A1 > 0, it indicates sealing. The larger the value of the lateral sealing evaluation parameter A1, the better the sealing property of the target gas storage reservoir trap. When the lateral sealing evaluation parameter A1 ≤ 0, it indicates non-sealing. The smaller the value of the lateral sealing evaluation parameter A1, the worse the sealing property of the target gas storage reservoir trap.

[0068] In some embodiments, the inversion prediction results further include: the dip direction of the caprock formation, the dip angle of the caprock formation, the dip direction of the reservoir formation, the dip angle of the reservoir formation, and the vertical apparent thickness of the caprock. Figure 3 This is a schematic diagram of the vertical structure of the caprock and reservoir provided by the embodiments of the present invention, as Figure 3 shown, H4 represents the vertical caprock thickness, θ1 represents the dip angle of the caprock formation, θ2 represents the dip angle of the reservoir formation, and H3 represents the vertical apparent thickness of the caprock. The vertical sealing evaluation parameter can be the vertical caprock thickness H4, and the expression of the vertical caprock thickness H4 is:

[0069] As Figure 3 shown in (1) below, when the dip direction of the caprock formation and the dip direction of the reservoir formation are the same, and θ1 > θ2, H4 = cos(θ1 - θ2)·H3.

[0070] As Figure 3 shown in (2) below, when the dip direction of the caprock formation and the dip direction of the reservoir formation are the same, and θ1 = θ2, H4 = cos(θ1)·H3.

[0071] As Figure 3 shown in (3) below, when the dip direction of the caprock formation and the dip direction of the reservoir formation are opposite, H4 = H3.

[0072] Among them, the sealing property of the target gas storage reservoir trap is positively correlated with the magnitude of the vertical caprock thickness, that is, the larger the vertical caprock thickness, the better the sealing property of the target gas storage reservoir trap. The smaller the vertical caprock thickness, the worse the sealing property of the target gas storage reservoir trap.

[0073] Exemplarily, for the sealing requirement of the target gas storage reservoir trap, when H4 > the first thickness threshold (for example, 10 m), it indicates good sealing property; when 0 m < H4 < the first thickness threshold, it indicates poor sealing property; when H4 = 0, it indicates non-sealing. The first thickness threshold can be preset according to actual application requirements.

[0074] Adopting the comprehensive evaluation method for the sealing property of the gas storage fault-block trap provided by the embodiments of the present invention has the following beneficial effects:

[0075] 1. This method uses the pseudo-impedance inversion method to invert different layers under the framework constraints of the seismic interpretation results of the cap layer, reservoir layer, and faults, and obtains the lithology through conversion relationship to determine the structure of each layer, which can more accurately determine the spatial contact relationship between the reservoir and cap layer of the gas storage. This lithology characterization method makes full use of the seismic interpretation results, takes into account the structural morphology of the cap layer and reservoir layer, and the influence of faults on the structure. The pseudo-impedance inversion method has a better effect on the identification of the cap layer and reservoir layer. The combination of the two has both the control of seismic structural layers and faults, and the lithology prediction results of pseudo-impedance inversion, which can better reflect the spatial distribution of the reservoir and cap layer of the gas storage.

[0076] 2. This method combines the different contact relationships between the cap rock and the reservoir, establishes the vertical and longitudinal plugging evaluation parameters of the gas storage block trap, and the evaluation results are more comprehensive. This method considers five contact situations between the reservoir and the cap rock in the lateral direction, and three contact situations between the reservoir and the cap rock in the vertical direction, and establishes the lateral and vertical evaluation parameters and limits for each case, which can better meet the needs of the gas storage block trap plugging evaluation.

[0077] In summary, the comprehensive evaluation method for the plugging performance of fault-block traps in gas storages provided by the embodiments of the present invention can achieve a comprehensive and accurate evaluation of the plugging performance of fault-block traps in gas storages.

[0078] The present application also provides a comprehensive evaluation device for the sealing performance of fault-block type closures in a gas storage reservoir. Figure 4 A schematic diagram of the structure of a comprehensive evaluation device for the plugging performance of a gas storage fault-block type trap provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the comprehensive evaluation device 400 for the plugging performance of fault-block traps in a gas storage reservoir comprises: a stratum interpretation module 401 , a fault interpretation module 402 , a conversion module 403 , a pseudo-impedance inversion module 404 and an evaluation module 405 .

[0079] Among them, the stratigraphic interpretation module 401 can be used to perform stratigraphic interpretation on the cap rock and reservoir rock in the target gas storage trap according to the seismic data of the target gas storage trap, and determine the stratigraphic interpretation results; the stratigraphic interpretation results include: the first lithology corresponding to the cap rock, the second lithology corresponding to the reservoir rock, the spatial structural morphology data of the cap rock, and the spatial structural morphology data of the reservoir rock.

[0080] The fault interpretation module 402 can be used to interpret the faults in the target gas storage trap according to the seismic data and determine the fault interpretation results; the fault interpretation results are used to characterize the distribution data of the faults and the spatial docking relationship between the cap rock and the reservoir.

[0081] The conversion module 403 may be used to determine a well logging curve according to the first lithology and the second lithology, and determine a conversion relationship between the well logging curve and impedance, wherein the well logging curve is used to distinguish the first lithology from the second lithology.

[0082] The quasi-impedance inversion module 404 can be used to construct a stratigraphic framework model of the target gas storage reservoir trap based on the spatial structural morphological data of the cap layer and the spatial structural morphological data of the reservoir layer, and to perform structural prediction of the cap layer and the reservoir layer through quasi-impedance inversion based on the stratigraphic framework model, and to determine the inversion prediction results based on the conversion relationship between the logging curve and the impedance. The inversion prediction results are used to characterize the predicted spatial structure of the cap layer and the predicted spatial structure of the reservoir layer.

[0083] The evaluation module 405 can be used to determine lateral plugging evaluation parameters and vertical plugging evaluation parameters according to the fracture interpretation results and the inversion prediction results. The lateral plugging evaluation parameters and vertical plugging evaluation parameters are used to evaluate the plugging properties of the target gas storage trap.

[0084] An embodiment of the present invention further provides an electronic device, which may include: a display screen, a memory, and one or more processors. The display screen, the memory, and the processor are coupled. The memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the electronic device may execute each method or step executed in the above method embodiment. Of course, the electronic device includes but is not limited to the above display screen, the memory, and one or more processors.

[0085] The embodiment of the present invention further provides a computer-readable storage medium for storing computer instructions for running the comprehensive evaluation method for the plugging performance of fault-block traps in gas storage facilities shown in S101-S105 above.

[0086] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0087] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A comprehensive evaluation method for the plugging performance of fault-block traps in gas storage, characterized in that: include: Based on the seismic data of the target gas storage trap, performing stratigraphic interpretation on the cap rock and reservoir rock in the target gas storage trap to determine the stratigraphic interpretation result; The stratigraphic interpretation result includes: a first lithology corresponding to the cap layer, a second lithology corresponding to the reservoir layer, spatial structural morphology data of the cap layer, and spatial structural morphology data of the reservoir layer; Performing fracture interpretation on the faults in the target gas storage trap according to the seismic data to determine the fracture interpretation results; the fracture interpretation results are used to characterize the distribution data of the faults and the spatial docking relationship between the cap rock and the reservoir; Determine a well logging curve according to the first lithology and the second lithology, and determine a conversion relationship between the well logging curve and impedance, wherein the well logging curve is used to distinguish the first lithology and the second lithology; A stratigraphic framework model of the target gas storage reservoir trap is constructed according to the spatial structural morphological data of the cap layer and the spatial structural morphological data of the reservoir layer, and structural prediction of the cap layer and the reservoir layer is performed through pseudo-impedance inversion according to the stratigraphic framework model, and an inversion prediction result is determined according to the conversion relationship between the well logging curve and the impedance, and the inversion prediction result is used to characterize the spatial structure of the predicted cap layer and the spatial structure of the predicted reservoir layer; According to the fracture interpretation result and the inversion prediction result, lateral plugging evaluation parameters and vertical plugging evaluation parameters are determined, and the lateral plugging evaluation parameters and the vertical plugging evaluation parameters are used to evaluate the plugging property of the target gas storage trap.

2. The method according to claim 1, characterized in that The fault interpretation results include: the vertical fault throw of the fault; the inversion prediction results include: the lateral cap rock thickness and the lateral reservoir thickness; the expression of the lateral plugging evaluation parameter is: When L1≤H1 and L1≥H2, A1=1; In L1 ​ In the case where L1 > H1 and, H1 < H2, When L1≥H1 and H1≥H2, When L1>H1, and H1+H2-L1≥H2, A1=-1; In the formula, A1 represents the lateral plugging evaluation parameter, H1 represents the lateral cap rock thickness, H2 represents the lateral cap rock thickness, and L1 represents the vertical fault throw of the fault; The range of the lateral plugging evaluation parameter is 1 to -1, and the plugging property of the target gas storage reservoir is positively correlated with the magnitude of the lateral plugging evaluation parameter.

3. The method according to claim 1 or 2, characterized in that: The inversion prediction results include: cap rock formation dip, cap rock formation dip, reservoir formation dip, reservoir formation dip and vertical cap rock apparent thickness; the vertical plugging evaluation parameter is vertical cap rock thickness, and the expression of vertical cap rock thickness is: When the cap rock formation dip is the same as the reservoir formation dip and θ1>θ2, H4=cos(θ1-θ2)·H3; When the cap rock formation dip is the same as the reservoir formation dip and θ1=θ2, H4=cos(θ1)·H3; When the cap rock and reservoir rock have opposite inclinations, H4 = H3; Where, H4 represents the vertical cap rock thickness, θ1 represents the cap rock formation dip, θ2 represents the reservoir formation dip, and H3 represents the vertical cap rock apparent thickness; The sealing property of the target gas storage reservoir is positively correlated with the thickness of the vertical caprock.

4. The method according to claim 1, characterized in that: After determining the well logging curve according to the first lithology and the second lithology, and determining the conversion relationship between the well logging curve and impedance, the method further includes: Determine the pseudo-impedance value according to the conversion relationship between the logging curve and the impedance; According to the pseudo-impedance plate, the impedance limits corresponding to the strata and lithology in the target gas storage trap are determined, and the impedance limits are used to determine the inversion prediction results.

5. The method according to claim 1, characterized in that The method of performing structural prediction on the cap rock and the reservoir rock by pseudo-impedance inversion according to the stratigraphic framework model, and determining the inversion prediction result according to the conversion relationship between the logging curve and impedance, comprises: According to the stratigraphic framework model, the cap rock and the reservoir rock are predicted by pseudo-impedance inversion to determine a pseudo-impedance data volume; Determining predicted lithology according to the pseudo-impedance data volume and the conversion relationship between the logging curve and impedance; The spatial structure of the predicted cap rock and the spatial structure of the predicted reservoir are determined according to the predicted lithology to obtain the inversion prediction result.

6. The method according to claim 1, characterized in that The logging curve is a gamma curve, or an acoustic wave curve, or a density curve.

7. The method according to claim 1, characterized in that The spatial structural morphological data of the cap layer include: top interface structural parameters and bottom interface structural parameters of the cap layer; The spatial structural morphological data of the reservoir include: top interface structural parameters and bottom interface structural parameters of the reservoir.

8. A comprehensive evaluation device for the sealing performance of fault-block traps in gas storage, characterized in that: include: Horizon interpretation module, fracture interpretation module, conversion module, pseudo-impedance inversion module and evaluation module; The stratigraphic interpretation module is used to perform stratigraphic interpretation on the cap rock and reservoir rock in the target gas storage trap according to the seismic data of the target gas storage trap, and determine the stratigraphic interpretation result; The stratigraphic interpretation result includes: a first lithology corresponding to the cap layer, a second lithology corresponding to the reservoir layer, spatial structural morphology data of the cap layer, and spatial structural morphology data of the reservoir layer; The fault interpretation module is used to perform fault interpretation on the faults in the target gas storage trap according to the seismic data to determine the fault interpretation results; the fault interpretation results are used to characterize the distribution data of the faults and the spatial docking relationship between the cap rock and the reservoir; The conversion module is used to determine a well logging curve according to the first lithology and the second lithology, and to determine a conversion relationship between the well logging curve and impedance, wherein the well logging curve is used to distinguish the first lithology and the second lithology; The pseudo-impedance inversion module is used to construct a stratigraphic framework model of the target gas storage reservoir trap according to the spatial structural morphological data of the cap layer and the spatial structural morphological data of the reservoir layer, perform structural prediction on the cap layer and the reservoir layer through pseudo-impedance inversion according to the stratigraphic framework model, and determine the inversion prediction result according to the conversion relationship between the well logging curve and the impedance, and the inversion prediction result is used to characterize the spatial structure of the predicted cap layer and the spatial structure of the predicted reservoir layer; The evaluation module is used to determine lateral plugging evaluation parameters and vertical plugging evaluation parameters according to the fracture interpretation result and the inversion prediction result. The lateral plugging evaluation parameters and the vertical plugging evaluation parameters are used to evaluate the plugging property of the target gas storage trap.

9. An electronic device, characterized in that: include: A memory and one or more processors; the memory is coupled to the processor; wherein the memory stores computer program code, the computer program code includes computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The method comprises computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method according to any one of claims 1 to 7.

Images