Method, device and equipment for identifying effective migration path of oil gas penetrating static fault and medium

Abstract

The invention relates to the technical field of oil and gas exploration, and discloses an effective migration path identification method, device and equipment for oil and gas to penetrate through a static fault and a medium. And obtaining fault mud ratio distribution data of a first section ridge in the first fault and fault mud ratio distribution data of a second section ridge in the second fault. And determining a lower limit value of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-formed area, and determining a lower limit value of the transport capability index of the sand body layer according to the drilling lithology data of the reservoir-formed area. And based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the fault lateral closure lower limit value and the transport capacity index lower limit value, determining an effective migration path of oil and gas from the hydrocarbon source rock penetrating through the first fault, the sand body layer and the second fault. According to the method, the effective migration path of the oil gas penetrating through the static fault can be effectively identified, and the identification accuracy is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to a method, device, equipment and medium for identifying an effective migration path of oil and gas penetrating a static fault. Background Art

[0002] During the migration of oil and gas to the slope zone or shallow strata, the migration space accounts for less than 10% of the entire transport layer. The effective migration path is the key to whether oil and gas can be accumulated and the scale of accumulation.

[0003] Related technologies have proposed a variety of ways to identify effective oil and gas migration paths. For example, the effective or dominant locations of fault-conducted oil and gas are determined based on the fault activity rate, cross-section morphology, and scale of caprock development. Another example is that the effective or dominant locations of sand body-conducted oil and gas are determined by parameters such as sand body morphology, sand body physical properties, and fluid potential on the top of the sand body. Another example is that the oil and gas migration process is characterized through basin simulation software to determine the effective oil and gas migration path.

[0004] However, the above identification methods proposed by related technologies are all aimed at faults that are still active during the oil and gas accumulation period, namely active faults, and are not applicable to static faults. Summary of the invention

[0005] The present invention provides a method, device, equipment and medium for identifying an effective migration path of oil and gas through a static fault, so as to solve the defect that the related technology cannot identify the effective migration path of oil and gas through a static fault, and effectively realize the identification of the effective migration path of oil and gas through a static fault.

[0006] In a first aspect, the present invention provides a method for identifying an effective migration path of oil and gas through a stationary fault, comprising: Acquire drilling lithology data of the hydrocarbon accumulation area in the target area, and acquire fault mud ratio distribution data of the first section ridge in the first fault and fault mud ratio distribution data of the second section ridge in the second fault; wherein the first fault is a static fault connected to the source rock in the non-hydrocarbon accumulation area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-hydrocarbon accumulation area and is connected to the first fault through a sand body layer; Determine the lower limit of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area, and determine the lower limit of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area; Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing of the fault and the lower limit value of the conductivity index, the effective migration path of the oil and gas from the source rock through the first fault, the sand body layer and the second fault is determined.

[0007] Optionally, the determining the lower limit of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area includes: Determining drilling lithology data of at least two static faults in the reservoir-forming area; Determining fault mud ratio distribution data of the at least two static faults according to the drilling lithology data of the two static faults; Screening out the fault gouge ratio distribution data of the oil and gas layer from the fault gouge ratio distribution data of the at least two static faults; The minimum fault mud ratio is determined in the fault mud ratio distribution data of the oil and gas layer and used as the lower limit value of the lateral sealing of the fault.

[0008] Optionally, determining the lower limit value of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area includes: Determine the sand body thickness, sand-to-formation ratio, sand body dip angle and sand body permeability of typical wells in the already formed reservoir area based on the drilling lithology data of the already formed reservoir area; Based on the sand body thickness, sand-to-formation ratio, sand body inclination and sand body permeability of the typical drilling, a fitting relationship between the sand body conductivity index and the oil and gas layer thickness is constructed; Based on the fitting relationship, the sand body conductivity index corresponding to the oil and gas layer thickness of 0 is determined and used as the lower limit value of the conductivity index of the sand body layer.

[0009] Optionally, the determining of an effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the fault lateral sealing property and the lower limit value of the conductivity index comprises: Acquiring distribution data of conductivity index of the sand body layer; According to the conductivity index distribution data of the sand body layer and the lower limit value of the conductivity index, a distribution area in the sand body layer where the conductivity index value is greater than the lower limit value of the conductivity index is determined, and the distribution area is used as an effective oil and gas migration area of ​​the sand body layer; For a target section ridge, according to the fault mud ratio distribution data of the target section ridge, a distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing property of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault is determined.

[0010] Optionally, determining the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault according to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer includes: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for the oil and gas to pass through the first fault and reach the sand body layer; Determine a second overlapping area between the effective oil and gas migration area of ​​the second section ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the second overlapping area as an effective migration path for the oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

[0011] In a second aspect, the present invention provides an effective migration path identification device for oil and gas through a stationary fault, comprising: A first acquisition unit is used to acquire drilling lithology data of the reservoir-forming area in the target area; a second acquisition unit, for acquiring fault mud ratio distribution data of a first section ridge in a first fault and fault mud ratio distribution data of a second section ridge in a second fault; wherein the first fault is a static fault connected to a source rock in an un-accumulated area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the un-accumulated area and is connected to the first fault through a sand body layer; A first determination unit is used to determine the lower limit value of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area; A second determination unit is used to determine the lower limit value of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area; The third determination unit is used to determine the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing of the fault and the lower limit value of the conductivity index.

[0012] Optionally, the third determining unit is further configured to: Acquiring distribution data of conductivity index of the sand body layer; According to the conductivity index distribution data of the sand body layer and the lower limit value of the conductivity index, a distribution area in the sand body layer where the conductivity index value is greater than the lower limit value of the conductivity index is determined, and the distribution area is used as an effective oil and gas migration area of ​​the sand body layer; For a target section ridge, according to the fault mud ratio distribution data of the target section ridge, a distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing property of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault is determined.

[0013] Optionally, the third determining unit is further configured to: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for the oil and gas to pass through the first fault and reach the sand body layer; Determine a second overlapping area between the effective oil and gas migration area of ​​the second section ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the second overlapping area as an effective migration path for the oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

[0014] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the effective migration path identification method of oil and gas penetrating a static fault according to the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0015] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for identifying an effective migration path of oil and gas through a stationary fault according to the first aspect or any corresponding embodiment thereof.

[0016] The effective migration path identification method, device, equipment and medium for oil and gas passing through static faults provided by the present invention can obtain drilling lithology data of the reservoir area in the target area, as well as obtain fault mud ratio distribution data of the first section ridge in the first fault and fault mud ratio distribution data of the second section ridge in the second fault. Among them, the first fault is a static fault connected to the source rock in the non-reservoir area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-reservoir area and is connected to the first fault through the sand body layer. The lower limit value of the lateral closure of the fault is determined according to the drilling lithology data of the reservoir area, and the lower limit value of the conductivity index of the sand body layer is determined according to the drilling lithology data of the reservoir area. Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral closure of the fault and the lower limit value of the conductivity index, the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault is determined. The present invention can effectively realize the identification of the effective migration path of oil and gas through static faults and ensure the accuracy of the identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a method for identifying an effective migration path of oil and gas through a static fault provided by an embodiment of the present invention; Figure 2 The cross-sectional diagram and cross-sectional morphology division results of the F1, F2, and F3 faults provided in the embodiment of the present invention; Figure 3 F1 fault provided by the embodiment of the present invention SGR Value calculation result diagram; Figure 4 The different layers in the F4 and F5 faults provided in the embodiment of the present invention SGR Value calculation result diagram; Figure 5 A scatter plot of the sand body conductivity index and oil and gas layer thickness in the reservoir area provided in the embodiment of the present invention; Figure 6 The isoline diagram of the conductivity index of the sand body of the sand layer group provided in the embodiment of the present invention; Figure 7 A schematic diagram of an effective oil and gas migration path provided by an embodiment of the present invention; Figure 8A flow chart of another method for identifying an effective migration path of oil and gas through a stationary fault provided by an embodiment of the present invention; Fig. 9 A schematic diagram of the structure of a device for identifying an effective migration path of oil and gas through a static fault provided by an embodiment of the present invention; Fig.10 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Combine the following Figure 1-Figure 8 The present invention describes the effective migration path identification method of oil and gas through static faults.

[0021] like Figure 1 As shown, this embodiment proposes a first method for identifying an effective migration path of oil and gas through a stationary fault. The method may include the following steps: S101. Acquire drilling lithology data of the reservoir-forming area in the target area.

[0022] The target area may be a geographical area containing oil and gas. The target area may include an area with oil and gas reservoirs and an area without oil and gas reservoirs. An area with oil and gas reservoirs is an area in the target area where oil and gas reservoirs have been explored, and an area without oil and gas reservoirs is an area in the target area where oil and gas reservoirs have not yet been explored.

[0023] Among them, drilling lithology data refers to the data related to the properties of formation rocks obtained during the drilling process, which may specifically include lithology description, formation pressure and wellbore diameter.

[0024] S102, obtaining fault mud ratio distribution data of the first section ridge in the first fault and fault mud ratio distribution data of the second section ridge in the second fault. The first fault is a static fault connected to the source rock in the non-accumulation area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-accumulation area and is connected to the first fault through a sand body layer.

[0025] Specifically, the first section ridge and the second section ridge are section ridges in the first fault and the second fault, respectively. It should be noted that the section ridge is a favorable oil and gas gathering area in the fault.

[0026] The fault mud ratio distribution data of the cross-section ridge may include the corresponding relationship between the position points at different positions in the cross-section ridge and the fault mud ratio.

[0027] In this embodiment, three faults F1, F2 and F3 that play a major role in transport can be selected in the target area, among which the F1 fault is located in the southeast part of the tectonic belt, close to the depression, and vertically communicates with mature source rocks. It is the main transport fault and can be used as the first fault. The F2 and F3 faults are located in the northwest part of the tectonic belt. Although they do not directly communicate with source rocks, they can transport oil and gas migrated from the F1 fault and can be used as the second fault.

[0028] like Figure 2 As shown, this embodiment can track and interpret faults based on 3D seismic data, use software to model the fault structure and form a cross-section diagram, and determine 15 convergent and straight cross-section morphological areas (such as Figure 2 Specifically, this embodiment can collect the drilling lithology data in the un-accumulated area, calculate the shale content by natural gamma logging, perform attribute modeling on the formation, and finally obtain the shale gouge ratio (Shale Gouge Ratio, SGR ) value, such as Figure 3 The F1 fault is shown SGR Value distribution.

[0029] S103. Determine the lower limit of the lateral sealing property of the fault based on the drilling lithology data of the reservoir-forming area.

[0030] Specifically, in this embodiment, after obtaining the drilling lithology data of the reservoir-forming area, the lower limit value of the lateral sealing property of the fault can be determined according to the drilling lithology data.

[0031] Optionally, step S103 may include: Determine drilling lithology data for at least two quiescent faults in the reservoir area; Determine fault mud ratio distribution data of at least two stationary faults based on the drilling lithology data of the two stationary faults; Screening out the fault mud ratio distribution data of the oil and gas layer from the fault mud ratio distribution data of at least two static faults; The minimum fault mud ratio is determined in the fault mud ratio distribution data of the oil and gas layer and is used as the lower limit of the lateral sealing of the fault.

[0032] It should be noted that in this embodiment, typical faults in the reservoir area can be selected, mudstone thickness can be calculated based on drilling lithology data of the upper and lower walls of the typical faults, fault throws can be calculated based on the three-dimensional seismic interpretation, and fault mud ratios at different depths can be calculated, as shown in formula (1):

[0033] is the fault mud ratio. Starting from the research point, the distance The length of the fault hanging wall The thickness of the mudstone layer in meters. Starting from the research point, the distance The number of mudstone layers in the hanging wall of the fault within the length, dimensionless. is the fault distance in meters.

[0034] Specifically, in this embodiment, two oil source faults (F4 and F5) can be selected in the reservoir area, the mudstone thickness can be calculated based on the lithology data of the two drilling plates of the fault, the fault distance can be calculated using the fault interpretation of 3D seismic, and then the mud ratio of different depths can be calculated based on the above formula (1): SGR The calculation result is as follows Figure 4 As shown, F4 fault SGR The values ​​are distributed between 35%-86%, F5 fault SGR The values ​​range from 2.3% to 86%.

[0035] It should be noted that this embodiment can count different depths. SGR The value corresponds to the oil and gas display of the sand body. The oil and gas display can be divided into dry layer, water layer, oil and gas display layer, oil layer, and gas layer. The oil layer and gas layer are collectively referred to as the oil and gas layer. Since oil and gas can only accumulate to form an oil and gas layer when the lateral sealing of the fault is good, the oil and gas layer is corresponding to SGR The minimum value is the lower limit of the fault's lateral closure. SGR When the value is less than the lower limit, the lateral sealing of the fault is poor, and oil and gas can migrate laterally through the fault.

[0036] like Figure 4 As shown, this embodiment can distinguish different depths SGR The value corresponds to the oil and gas display of the sand body, and the oil and gas layer of the F4 fault corresponds to SGR The distribution range is 37%-81%, with the minimum value being 37%. SGR The distribution range is 30%-80%, with a minimum value of 30%. SGR The minimum value is 30%, which is the lower limit of the lateral closure of the fault in the target area, that is, the lower limit of the lateral closure of the fault mentioned above.

[0037] S104. Determine the lower limit of the conductivity index of the sand body layer based on the drilling lithology data of the reservoir-forming area.

[0038] Specifically, in this embodiment, after obtaining the drilling lithology data of the reservoir-forming area, the lower limit value of the conductivity index of the sand body layer can be determined according to the drilling lithology data of the reservoir-forming area.

[0039] Optionally, step S104 may include: Based on the drilling lithology data of the existing reservoir area, determine the sand body thickness, sand-to-formation ratio, sand body dip angle and sand body permeability of typical wells in the existing reservoir area; Based on the sand body thickness, sand-to-formation ratio, sand body inclination and sand body permeability of typical drilling, a fitting relationship between the sand body conductivity index and the thickness of the oil and gas layer is constructed; Based on the fitting relationship, the conductivity index of the sand body corresponding to the oil and gas layer thickness of 0 is determined and used as the lower limit of the conductivity index of the sand body layer.

[0040] Specifically, in this embodiment, a typical well location in an established reservoir area can be selected, and the sand body thickness, sand-to-ground ratio, sand body inclination and sand body permeability can be counted, and the sand body conductivity index of each sand layer group can be calculated using formula (2). Formula (2) is:

[0041] is the sand body conductivity index, is the sand body thickness, For sand-to-ground ratio, is the sand body permeability, is the inclination of the sand body. It should be noted that the factors affecting the conductivity of the sand body mainly include the thickness of the sand body, the sand-to-ground ratio, the inclination of the sand body and the physical properties of the sand body (permeability). The larger the values ​​of the above four parameters, the stronger the conductivity of the sand body. The evaluation formula of the conductivity of the sand body in the related art does not take into account all the influencing factors. This embodiment combines the above influencing factors to establish a more comprehensive sand body conductivity index. The larger the value, the stronger the sand body's transport capacity. Among them, the sand body thickness and sand-to-ground ratio can be obtained through drilling lithology data, the sand body dip angle can be obtained through the stratigraphic data of 3D seismic interpretation, and the sand body permeability can be obtained based on core measured data.

[0042] Specifically, this embodiment can calculate the oil and gas layer thickness of each sand layer group based on the sand body conductivity calculation results of each sand layer group, and establish a fitting relationship formula (3) between the sand body conductivity index and the oil and gas layer thickness of the corresponding sand layer group, such as Figure 5 As shown, formula (3) is:

[0043] A is the thickness of the oil and gas layer, V The inventors of the present invention have found that the correlation coefficient R between the sand body conductivity index and the oil and gas layer thickness is2 The value is 0.76, which proves the reliability of the sand body conductivity index proposed in this embodiment. In this embodiment, the sand body conductivity index corresponding to the oil and gas layer thickness of 0m can be used as the lower limit value of oil and gas migration along the sand body, that is, the lower limit value of the conductivity index. Specifically, in this embodiment, the sand body conductivity index corresponding to the oil and gas layer thickness of 0m can be calculated using formula (3), and the lower limit value of the conductivity index for oil and gas migration along the sand body is 0.9.

[0044] S105. Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing property of the fault and the lower limit value of the conductivity index, determine the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault.

[0045] Specifically, this embodiment can determine the effective migration path of oil and gas from the source rock through the first fault, sand body layer and the second fault based on the acquired fault mud ratio distribution data of the first section ridge and the second section ridge, and the calculated lower limit value of the lateral closure of the fault and the lower limit value of the conductivity index.

[0046] Optionally, step S105 may include: Obtain the distribution data of conductivity index of sand body layer; According to the distribution data of the conductivity index of the sand body layer and the lower limit of the conductivity index, the distribution area where the conductivity index value in the sand body layer is greater than the lower limit of the conductivity index is determined, and it is used as the effective oil and gas migration area of ​​the sand body layer; For the target section ridge, according to the fault mud ratio distribution data of the target section ridge, the distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of oil and gas through the first fault, the sand body layer and the second fault is determined.

[0047] The conductivity index distribution data include the corresponding relationship between the position points at different positions in the sand body layer and the conductivity index.

[0048] It can be understood that this embodiment can determine the distribution area where the conductivity index value is greater than the lower limit value of the conductivity index in the sand body layer based on the conductivity index distribution data of the sand body layer and the lower limit value of the conductivity index, and determine the distribution area as the effective oil and gas migration area of ​​the sand body layer.

[0049] In this embodiment, the distribution area where the fault mud ratio is less than the lower limit of the lateral closure of the fault can be determined in the first section ridge according to the fault mud ratio distribution data of the first section ridge, and the area is used as the effective oil and gas migration area of ​​the first section ridge. In this embodiment, the distribution area where the fault mud ratio is less than the lower limit of the lateral closure of the fault can be determined in the second section ridge according to the fault mud ratio distribution data of the second section ridge, and the area is used as the effective oil and gas migration area of ​​the second section ridge.

[0050] Specifically, this embodiment can determine the effective migration path of oil and gas through the first fault, the sand body layer and the second fault based on the effective oil and gas migration area of ​​the sand body layer, the effective oil and gas migration area of ​​the first section ridge and the effective oil and gas migration area of ​​the second section ridge.

[0051] Optionally, the above-mentioned determination of the effective migration path of oil and gas through the first fault, the sand body layer and the second fault based on the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer includes: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for oil and gas to pass through the first fault and reach the sand body layer; A second overlapping area between the effective oil and gas migration area of ​​the second fault ridge and the effective oil and gas migration area of ​​the sand body layer is determined, and the second overlapping area is determined as an effective migration path for oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

[0052] The first superimposed area is the overlapping area between the effective oil and gas migration area of ​​the first section ridge and the effective oil and gas migration area of ​​the sand body layer. The second superimposed area is the overlapping area between the effective oil and gas migration area of ​​the second section ridge and the effective oil and gas migration area of ​​the sand body layer.

[0053] Specifically, this embodiment can count the sand body thickness, sand-to-formation ratio, sand body inclination and sand body permeability of each sand layer group in the un-accumulated area of ​​the target area. Establish multiple virtual wells, and use the stratigraphic data interpreted from the three-dimensional seismic data to count the sand body inclination. Use the three-dimensional seismic inversion data to count the sand body thickness and sand-to-formation ratio. According to the permeability variation trend of the drilled wells with different lithologies and depths, combined with the sedimentary phase, estimate the average permeability of each sand layer group in the virtual well; use the above formula (2) to calculate the sand body conductivity index of each sand layer group. Figure 6 As shown in Figure 1, this is a contour map of the conductivity index of the sand body of the P4 sand layer group in the un-accumulated area. According to the lower limit of the conductivity index of 0.9, the range of the conductive sand body is determined.

[0054] In practical applications, this embodiment can determine the straight and convergent cross-section morphology areas and faults in the un-accumulated area. SGRThe overlapped area where the conductivity index of each sand layer group is greater than the lower limit of the closed oil and gas is smaller than the lower limit, and the three-dimensional effective path of oil and gas migration along the sand body through the static fault is obtained. Figure 7 As shown in the figure, this is the effective path for oil and gas migration in the unaccumulated area. The oil and gas first migrate vertically along the F1 fault, penetrate the F1 fault and then migrate along the effective path of the P4 sand layer group, and then penetrate the F2 and F3 faults and migrate along the effective path of the P4 sand layer group.

[0055] The inventors of the present invention have found through research that the wells drilled in the P4 sand layer group in the un-accumulated area where oil and gas were found are all located on the effective migration path, which proves the feasibility and reliability of the identification method of this embodiment.

[0056] This embodiment mainly focuses on the migration of oil and gas through static faults, and provides a method for determining the effective migration path of oil and gas for depressions with a poor matching relationship between the fault activity period and the oil and gas accumulation period (the fault is static during oil and gas accumulation). Secondly, this embodiment fully considers the influencing factors of sand body conductivity, provides a more comprehensive quantitative evaluation method for sand body conductivity, and can determine the lower limit of conductivity based on oil and gas display, which can better identify the effective path of oil and gas migration along the sand body.

[0057] This embodiment can comprehensively consider the cross-sectional morphology, fault sealing and sand body conductivity to identify the effective migration path of oil and gas through static faults. The identification method has higher accuracy and can be applied to oil and gas exploration deployment.

[0058] The effective migration path identification method of oil and gas through static faults proposed in this embodiment can obtain drilling lithology data of the reservoir area in the target area, as well as the fault mud ratio distribution data of the first section ridge in the first fault and the fault mud ratio distribution data of the second section ridge in the second fault. Among them, the first fault is a static fault connected to the source rock in the non-reservoir area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-reservoir area and is connected to the first fault through the sand body layer. The lower limit value of the lateral closure of the fault is determined according to the drilling lithology data of the reservoir area, and the lower limit value of the conductivity index of the sand body layer is determined according to the drilling lithology data of the reservoir area. Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral closure of the fault and the lower limit value of the conductivity index, the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault is determined. This embodiment can effectively realize the identification of the effective migration path of oil and gas through static faults and ensure the accuracy of the identification.

[0059] like Figure 8 As shown, this embodiment proposes a second method for identifying an effective migration path of oil and gas through a stationary fault, the method comprising: S1. Interpret faults based on seismic data and determine the cross-section morphology.

[0060] Specifically, this embodiment can track and interpret the faults and construct modeling based on the exploration seismic data of the target area to form a cross-section diagram and divide the cross-section morphology. The convex type is divided into a convergent type, the parallel type is divided into a straight type, and the concave type is divided into a divergent type. The convergent type and the straight type can be determined as the cross-section ridge of the fault as a whole.

[0061] S2. Calculate the different depths of typical faults in the reservoir-forming area SGR value.

[0062] S3. Determine the lateral closure of the fault based on oil and gas indications SGR Lower limit value.

[0063] S4. Calculate the faults in the target area at different locations and vertical depths. SGR . Determine SGR The area with a value greater than the lower limit of closed oil and gas, and the area with a value greater than the lower limit of closed oil and gas, SGR Areas where the value is less than the lower limit of closed oil and gas.

[0064] S5. Calculate the conductivity index of sand bodies in typical wells in the reservoir area V .

[0065] S6. Determine the lower limit of the conductivity index based on the thickness of the oil and gas layer.

[0066] S7. Calculate the sand body conductivity index in the target area V , construct a contour map. V Areas greater than the conductance lower limit and less than the conductance lower limit.

[0067] This embodiment can track and interpret the horizon based on the three-dimensional seismic data of the target area, and count the dip angle of the sand bodies of each sand layer group; determine the thickness and sand-to-ground ratio of each sand layer group based on the three-dimensional seismic inversion data. According to the permeability variation trend of different lithology and depth of the wells near the target area, combined with the sedimentary phase diagram, determine the average permeability of the sand bodies of each sand layer group in the target area, calculate the conductivity index of the sand bodies of each sand layer group in the target area, and draw a contour map.

[0068] S8. Determine the overlapping areas based on the above-mentioned areas, thereby determining the effective migration path of oil and gas.

[0069] Specifically, in this embodiment, the target area straight and convergent cross-sectional morphology areas, SGR The areas where the conductivity index of each sand body group in the target area is greater than the lower limit value are taken as the effective areas for oil and gas migration along the sand body, and the overlapping areas of the above areas are taken as the effective paths for oil and gas migration along each sand body group after penetrating the static fault.

[0070] The method for identifying the effective migration path of oil and gas through static faults proposed in this embodiment can effectively realize the identification of the effective migration path of oil and gas through static faults, provide an identification method for the effective migration path of oil and gas for depressions with a poor matching relationship between the fault activity period and the oil and gas accumulation period, and can also serve as a basis for judging the possibility of closure accumulation.

[0071] like Fig. 9 As shown, this embodiment provides a device for identifying an effective migration path of oil and gas through a stationary fault, which may include: The first acquisition unit 901 is used to acquire drilling lithology data of the reservoir-forming area in the target area; The second acquisition unit 902 is used to acquire the fault mud ratio distribution data of the first section ridge in the first fault and the fault mud ratio distribution data of the second section ridge in the second fault; wherein the first fault is a static fault connected to the source rock in the non-accumulation area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-accumulation area and is connected to the first fault through a sand body layer; The first determination unit 903 is used to determine the lower limit value of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area; The second determination unit 904 is used to determine the lower limit value of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir area; The third determination unit 905 is used to determine the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the fault lateral sealing property and the lower limit value of the conductivity index.

[0072] It should be noted that the processing processes of the first acquisition unit 901, the second acquisition unit 902, the first determination unit 903, the second determination unit 904 and the third determination unit 905 and the beneficial effects thereof can be respectively referred to in Figure 1 Steps S101 to S105 in the above are not described in detail.

[0073] Optionally, the first determining unit 903 is further configured to: Determine drilling lithology data for at least two quiescent faults in the reservoir area; Determine fault mud ratio distribution data of at least two stationary faults based on the drilling lithology data of the two stationary faults; Screening out the fault mud ratio distribution data of the oil and gas layer from the fault mud ratio distribution data of at least two static faults; The minimum fault mud ratio is determined in the fault mud ratio distribution data of the oil and gas layer and is used as the lower limit of the lateral sealing of the fault.

[0074] Optionally, the second determining unit 904 is further configured to: Based on the drilling lithology data of the existing reservoir area, determine the sand body thickness, sand-to-formation ratio, sand body dip angle and sand body permeability of typical wells in the existing reservoir area; Based on the sand body thickness, sand-to-formation ratio, sand body inclination and sand body permeability of typical drilling, a fitting relationship between the sand body conductivity index and the thickness of the oil and gas layer is constructed; Based on the fitting relationship, the conductivity index of the sand body corresponding to the oil and gas layer thickness of 0 is determined and used as the lower limit of the conductivity index of the sand body layer.

[0075] Optionally, the third determining unit 905 is further configured to: Obtain the distribution data of conductivity index of sand body layer; According to the distribution data of the conductivity index of the sand body layer and the lower limit of the conductivity index, the distribution area where the conductivity index value in the sand body layer is greater than the lower limit of the conductivity index is determined, and it is used as the effective oil and gas migration area of ​​the sand body layer; For the target section ridge, according to the fault mud ratio distribution data of the target section ridge, the distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of oil and gas through the first fault, the sand body layer and the second fault is determined.

[0076] Optionally, the third determining unit 905 is further configured to: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for oil and gas to pass through the first fault and reach the sand body layer; A second overlapping area between the effective oil and gas migration area of ​​the second fault ridge and the effective oil and gas migration area of ​​the sand body layer is determined, and the second overlapping area is determined as an effective migration path for oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

[0077] The effective migration path identification device for oil and gas through static faults proposed in this embodiment can obtain drilling lithology data of the reservoir area in the target area, as well as the fault mud ratio distribution data of the first section ridge in the first fault and the fault mud ratio distribution data of the second section ridge in the second fault. Among them, the first fault is a static fault connected to the source rock in the non-reservoir area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-reservoir area and is connected to the first fault through the sand body layer. The lower limit value of the lateral sealing of the fault is determined according to the drilling lithology data of the reservoir area, and the lower limit value of the conductivity index of the sand body layer is determined according to the drilling lithology data of the reservoir area. Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing of the fault and the lower limit value of the conductivity index, the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault is determined. This embodiment can effectively realize the identification of the effective migration path of oil and gas through static faults and ensure the accuracy of the identification.

[0078] The effective migration path identification device for oil and gas passing through static faults in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0079] The embodiment of the present invention also provides a computer device having the above Fig. 9 The device shown is for identifying effective migration paths of oil and gas through stationary faults.

[0080] See also Fig.10 , a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories. Similarly, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig.10 A processor 10 is taken as an example.

[0081] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0082] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0083] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function. The data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0084] The memory 20 may include a volatile memory, such as a random access memory. The memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive. The memory 20 may also include a combination of the above-mentioned types of memory.

[0085] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0086] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying an effective migration path of oil and gas through a static fault, characterized in that: include: Acquire drilling lithology data of the hydrocarbon accumulation area in the target area, and acquire fault mud ratio distribution data of the first section ridge in the first fault and fault mud ratio distribution data of the second section ridge in the second fault; wherein the first fault is a static fault connected to the source rock in the non-hydrocarbon accumulation area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the non-hydrocarbon accumulation area and is connected to the first fault through a sand body layer; Determine the lower limit of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area, and determine the lower limit of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area; Based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing of the fault and the lower limit value of the conductivity index, the effective migration path of the oil and gas from the source rock through the first fault, the sand body layer and the second fault is determined.

2. The method according to claim 1, characterized in that The method of determining the lower limit of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area includes: Determining drilling lithology data of at least two static faults in the reservoir-forming area; Determining fault mud ratio distribution data of the at least two static faults according to the drilling lithology data of the two static faults; Screening out the fault gouge ratio distribution data of the oil and gas layer from the fault gouge ratio distribution data of the at least two static faults; The minimum fault mud ratio is determined in the fault mud ratio distribution data of the oil and gas layer and used as the lower limit value of the lateral sealing of the fault.

3. The method according to claim 1, characterized in that The step of determining the lower limit of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area includes: Determine the sand body thickness, sand-to-formation ratio, sand body dip angle and sand body permeability of typical wells in the already formed reservoir area based on the drilling lithology data of the already formed reservoir area; Based on the sand body thickness, sand-to-formation ratio, sand body inclination and sand body permeability of the typical drilling, a fitting relationship between the sand body conductivity index and the oil and gas layer thickness is constructed; Based on the fitting relationship, the sand body conductivity index corresponding to the oil and gas layer thickness of 0 is determined and used as the lower limit value of the conductivity index of the sand body layer.

4. The method according to claim 1, characterized in that: The method of determining the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the fault lateral sealing property and the lower limit value of the conductivity index comprises: Acquiring distribution data of conductivity index of the sand body layer; According to the conductivity index distribution data of the sand body layer and the lower limit value of the conductivity index, a distribution area in the sand body layer where the conductivity index value is greater than the lower limit value of the conductivity index is determined, and the distribution area is used as an effective oil and gas migration area of ​​the sand body layer; For a target section ridge, according to the fault mud ratio distribution data of the target section ridge, a distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing property of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault is determined.

5. The method according to claim 4, characterized in that The step of determining the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault according to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer comprises: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for the oil and gas to pass through the first fault and reach the sand body layer; Determine a second overlapping area between the effective oil and gas migration area of ​​the second section ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the second overlapping area as an effective migration path for the oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

6. An effective migration path identification device for oil and gas through static faults, characterized in that: include: A first acquisition unit is used to acquire drilling lithology data of the reservoir-forming area in the target area; a second acquisition unit, for acquiring fault mud ratio distribution data of a first section ridge in a first fault and fault mud ratio distribution data of a second section ridge in a second fault; wherein the first fault is a static fault connected to a source rock in an un-accumulated area of ​​the target area, and the second fault is a static fault that is not connected to the source rock in the un-accumulated area and is connected to the first fault through a sand body layer; A first determination unit is used to determine the lower limit value of the lateral sealing property of the fault according to the drilling lithology data of the reservoir-forming area; A second determination unit is used to determine the lower limit value of the conductivity index of the sand body layer according to the drilling lithology data of the reservoir-forming area; The third determination unit is used to determine the effective migration path of oil and gas from the source rock through the first fault, the sand body layer and the second fault based on the fault mud ratio distribution data of the first section ridge, the fault mud ratio distribution data of the second section ridge, the lower limit value of the lateral sealing of the fault and the lower limit value of the conductivity index.

7. The device according to claim 6, characterized in that The third determining unit is further configured to: Acquiring distribution data of conductivity index of the sand body layer; According to the conductivity index distribution data of the sand body layer and the lower limit value of the conductivity index, a distribution area in the sand body layer where the conductivity index value is greater than the lower limit value of the conductivity index is determined, and the distribution area is used as an effective oil and gas migration area of ​​the sand body layer; For a target section ridge, according to the fault mud ratio distribution data of the target section ridge, a distribution area where the fault mud ratio of the target section ridge is less than the lower limit of the lateral sealing property of the fault is determined, and used as the effective oil and gas migration area of ​​the target section ridge; wherein the target section ridge is the first section ridge or the second section ridge; According to the effective oil and gas migration area of ​​the target fault ridge and the effective oil and gas migration area of ​​the sand body layer, the effective migration path of the oil and gas through the first fault, the sand body layer and the second fault is determined.

8. The device according to claim 7, characterized in that The third determining unit is further configured to: Determine a first overlapping area between the effective oil and gas migration area of ​​the first fault ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the first overlapping area as an effective migration path for the oil and gas to pass through the first fault and reach the sand body layer; Determine a second overlapping area between the effective oil and gas migration area of ​​the second section ridge and the effective oil and gas migration area of ​​the sand body layer, and determine the second overlapping area as an effective migration path for the oil and gas to migrate to the second fault through the first fault and the sand body layer in sequence.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the effective migration path identification method for oil and gas penetrating a static fault as described in any one of claims 1 to 5 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method for identifying an effective migration path of oil and gas penetrating a stationary fault according to any one of claims 1 to 5.

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