Method, device, equipment, storage medium and computer program product for determining time required for formation of closure after source rock layer faulting activity

Abstract

This application relates to the field of oil and gas field exploration and development technology, and in particular to a method, apparatus, equipment, storage medium, and computer program product for determining the time required for closure after fracture activity in source rock formations. The method determines the diagenesis degree-time curve of the fracture zone based on the pressure of the overlying strata and the diagenesis time of the fracture zone; it determines the diagenesis degree-time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock; based on the diagenesis degree-time curves of the fracture zone and the surrounding rock, it matches the diagenesis degree of the fracture zone and the surrounding rock to determine the rock valve pressure of the fracture zone corresponding to the time point when the diagenesis degree is equal; based on the rock valve pressure of the fracture zone, it determines the valve pressure diagenesis time curve of the fracture zone; and based on the preset maximum valve pressure of the source rock formation and the valve pressure diagenesis time curve, it determines the target closure time, thus improving the prediction accuracy of the time required to reach a closed state after the fracture stops.

Description

Technical Field

[0001] This application relates to the field of oil and gas field exploration and development technology, and in particular to a method, apparatus, equipment, storage medium and computer program product for determining the time required for the formation of a seal after the fracture activity of a hydrocarbon source rock layer. Background Technology

[0002] In the field of oil and gas exploration and development, the conduction and sealing characteristics of fault zones directly affect the generation, migration, and accumulation of oil and gas. During fault activity, fault zones can transport oil and gas generated from source rocks to conventional reservoirs. When fault activity ceases, the fault zone gradually solidifies and forms a seal. This sealing process plays a crucial role in preventing oil and gas escape, promoting the preservation of shale oil and gas, and the formation of conventional oil and gas reservoirs. Accurately determining the sealing time required after fault activity can more scientifically predict oil and gas migration paths, the distribution of sweet spots, and favorable reservoir areas. Existing methods for studying fault sealing mainly include sealing inference based on the fault activity period, quantitative analysis of the mud content of the fault zone (such as SSF, CSP, and SGR methods), and assessment of sealing using the displacement pressure difference between the fault zone and the reservoir. However, most of these methods are limited to the analysis of fault-specific factors, neglecting the influence of the evolution of the fault zone and the surrounding rock diagenesis process over time, making it difficult to comprehensively assess when the fault zone acquires sealing capacity. Therefore, how to improve the prediction accuracy of the time required for a fault to reach a sealing state after cessation has become an urgent technical problem to be solved. Summary of the Invention

[0003] The main objective of this application is to provide a method, apparatus, equipment, storage medium, and computer program product for determining the time required for the formation of a closed state after fracture activity in a hydrocarbon source rock stratum, aiming to solve the technical problem of how to improve the prediction accuracy of the time required to reach a closed state after the fracture stops.

[0004] To achieve the above objectives, this application provides a method for determining the time required for the formation of a seal after fracture activity in a hydrocarbon source rock stratum, the method comprising the following steps:

[0005] The time curve of diagenesis degree of the fault zone is determined based on the pressure of the overlying strata and the diagenesis time of the fault zone.

[0006] Determine the time curve of the degree of diagenesis of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock;

[0007] Based on the time curve of diagenesis degree of the fault zone and the time curve of diagenesis degree of the surrounding rock, the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock are matched to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal.

[0008] Based on the rock valve pressure of the fracture zone, determine the diagenesis time curve of the fracture zone valve pressure;

[0009] The target sealing time is determined based on the preset maximum valve pressure of the source rock layer and the valve pressure diagenesis time curve.

[0010] In one embodiment, the step of determining the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone includes:

[0011] Obtain geological data of the fault zone, including information on the stratigraphic structure of the fault zone, the depositional rate of the overlying strata, and the depositional type and thickness;

[0012] Based on the geological data of the fault zone, determine the changes in formation pressure;

[0013] Based on the changes in formation pressure, the diagenetic process of the fault zone is determined;

[0014] Based on the diagenetic process of the rocks in the fault zone, the diagenetic state of the fault zone at different time periods is analyzed to determine the time curve of the degree of diagenesis of the fault zone.

[0015] In one embodiment, the step of determining the diagenesis time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock includes:

[0016] Acquire surrounding rock geological data, including surrounding rock strata type and thickness, surrounding rock deposition rate, and surrounding rock burial depth;

[0017] Based on the surrounding rock geological data, the static rock pressure at different time periods was determined;

[0018] The diagenetic process of the surrounding rock is determined based on the static rock pressure at different time periods.

[0019] Based on the diagenetic process of the surrounding rock, the diagenetic state of the surrounding rock at different time periods is analyzed to determine the time curve of the degree of diagenesis of the surrounding rock.

[0020] In one embodiment, the step of matching the diagenetic degree of the fault zone with the diagenetic degree of the surrounding rock based on the time curve of diagenetic degree of the fault zone and the time curve of diagenetic degree of the surrounding rock, and determining the rock valve pressure of the fault zone corresponding to the time point when the diagenetic degrees are equal, includes:

[0021] Based on the time curve of diagenesis of the fault zone and the time curve of diagenesis of the surrounding rock, the diagenesis of the fault zone and the diagenesis of the surrounding rock are synchronously compared at each time point;

[0022] Based on the comparison results, it is determined whether there is an intersection point between the time curve of the diagenesis degree of the fault zone and the time curve of the diagenesis degree of the surrounding rock;

[0023] If so, the rock pressure of the fault zone is determined based on the burial depth of the rock in the fault zone corresponding to the intersection point.

[0024] In one embodiment, the step of determining the diagenetic time curve of the fault zone based on the rock valve pressure of the fault zone includes:

[0025] Obtain the time point corresponding to the intersection point;

[0026] Based on the time point and the rock valve pressure of the fault zone, determine the trend of the rock valve pressure of the fault zone over time;

[0027] Based on the aforementioned trend, the rock valve pressures of the fault zone corresponding to each time point are arranged in chronological order to obtain a preliminary curve;

[0028] The preliminary curve is smoothed to obtain the valve compression time curve of the fracture zone.

[0029] In one embodiment, the step of determining the target sealing time based on the preset maximum valve pressure of the source rock formation and the valve pressure-diagenesis time curve includes:

[0030] The time point on the valve pressure diagenesis time curve that is equal to the maximum valve pressure of the preset hydrocarbon source rock layer is taken as the target point;

[0031] Obtain the time corresponding to the target point;

[0032] The target closure time is determined based on the time corresponding to the target point and the time when the fracture stops.

[0033] Furthermore, to achieve the above objectives, this application also proposes a device for determining the time required for the formation of a seal after fracture activity in a hydrocarbon source rock stratum. The device includes:

[0034] The fault zone curve module is used to determine the time curve of the degree of diagenesis of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone.

[0035] The surrounding rock curve module is used to determine the diagenesis time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock.

[0036] The diagenesis matching module is used to match the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock based on the time curve of diagenesis degree of the fault zone and the time curve of diagenesis degree of the surrounding rock, and determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal.

[0037] The fault zone valve pressure module is used to determine the fault zone valve pressure diagenesis time curve based on the fault zone rock valve pressure.

[0038] The target module is used to determine the target sealing time based on the preset maximum valve pressure of the source rock layer and the valve pressure diagenesis time curve.

[0039] Furthermore, to achieve the above objectives, this application also proposes a device for determining the time required for the formation of a closed structure after a fracture activity in a hydrocarbon source rock stratum. The device includes: a memory, a processor, and a program for determining the time required for the formation of a closed structure after a fracture activity in a hydrocarbon source rock stratum stored in the memory and executable on the processor. The program for determining the time required for the formation of a closed structure after a fracture activity in a hydrocarbon source rock stratum is configured to implement the steps of the method for determining the time required for the formation of a closed structure after a fracture activity in a hydrocarbon source rock stratum as described above.

[0040] In addition, to achieve the above objectives, this application also proposes a storage medium storing a program for determining the time required for the formation of a closure after fracture activity in a hydrocarbon source rock layer. When the program for determining the time required for the formation of a closure after fracture activity in a hydrocarbon source rock layer is executed by a processor, it implements the steps of the method for determining the time required for the formation of a closure after fracture activity in a hydrocarbon source rock layer as described above.

[0041] In addition, to achieve the above objectives, this application also proposes a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the method for determining the time required for closure to form after fracture activity of the source rock layer as described above.

[0042] This application determines the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone; it also determines the diagenesis time curve of the surrounding rocks based on the static rock pressure and diagenesis time of the surrounding rocks; based on the diagenesis time curves of the fault zone and the surrounding rocks, it matches the diagenesis degree of the fault zone with that of the surrounding rocks to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal; based on the rock valve pressure of the fault zone, it determines the valve pressure diagenesis time curve of the fault zone; and based on the preset maximum valve pressure of the source rock and the valve pressure diagenesis time curve, it determines the target sealing time. This application comprehensively analyzes the diagenesis time curves of the fault zone and the surrounding rocks, matches their diagenesis degree to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal, and further establishes a valve pressure-diagenesis time curve, which is compared with the maximum valve pressure of the source rock to accurately determine the sealing time. This process dynamically quantifies the evolution of the sealing capacity of the fault zone, avoids the errors of traditional static estimation, improves the scientificity and accuracy of prediction, and optimizes the efficiency and cost of exploration and development. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating the first embodiment of the method for determining the time required for the formation of a seal after fracture activity in the source rock strata of this application.

[0044] Figure 2 This is a schematic diagram of a sub-process in the second embodiment of the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in this application;

[0045] Figure 3 This is a schematic diagram of a sub-process in the third embodiment of the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in this application;

[0046] Figure 4 This is a schematic diagram of the module structure of the device for determining the time required for the formation of a seal after the fracture activity of the source rock strata in this application embodiment;

[0047] Figure 5 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the method for determining the time required for the formation of a seal after the fracture activity of the source rock layer in this application embodiment.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0050] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0051] It is important to note that in the field of oil and gas exploration and development, the conduction and sealing characteristics of fault zones directly affect the generation, migration, and accumulation of oil and gas. During fault activity, fault zones can transport oil and gas generated from source rocks to conventional reservoirs. When fault activity ceases, the fault zone gradually solidifies and forms a seal. This sealing process plays a crucial role in preventing oil and gas escape, promoting the preservation of shale oil and gas, and the formation of conventional oil and gas reservoirs. Accurately determining the sealing time required after fault activity can more scientifically predict oil and gas migration paths, the distribution of sweet spots, and favorable reservoir areas. Existing methods for studying fault sealing mainly include sealing inference based on the fault activity period, quantitative analysis of the mud content of the fault zone (such as SSF, CSP, and SGR methods), and assessment of sealing using the displacement pressure difference between the fault zone and the reservoir. However, most of these methods are limited to the analysis of fault-specific factors, neglecting the influence of the evolution of the fault zone and the surrounding rock diagenesis process over time, making it difficult to comprehensively assess when the fault zone acquires sealing capacity. Therefore, how to improve the prediction accuracy of the time required for a fault to reach a sealing state after cessation has become an urgent technical problem to be solved.

[0052] The main solution of this application is as follows: First, determine the time curve of diagenesis degree of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone. Second, determine the time curve of diagenesis degree of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock. Third, match the diagenesis degree of the fault zone with that of the surrounding rock based on the time curves of diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal. Fourth, determine the time curve of diagenesis at the valve pressure of the fault zone based on the rock valve pressure of the fault zone. Fifth, determine the target sealing time based on the preset maximum valve pressure of the source rock strata and the time curve of diagenesis at the valve pressure.

[0053] This application comprehensively analyzes the diagenesis time curves of the fault zone and surrounding rocks, matches the diagenesis degrees of the two to determine the rock valve pressure of the fault zone at equal time points, and further establishes a valve pressure-diagenesis time curve, which is compared with the maximum valve pressure of the source rock to accurately determine the sealing time. This process dynamically quantifies the evolution of the fault zone's sealing capacity, avoids the errors of traditional static estimation, improves the scientificity and accuracy of prediction, and optimizes the efficiency and cost of exploration and development.

[0054] It should be noted that the execution subject of the method in this embodiment can be a computing service device with data processing, network communication, and program execution functions, or it can be the aforementioned device for determining the time required for the formation of a seal after the fracturing activity of the source rock strata, which has the same or similar functions. This embodiment and the following embodiments will be described using the device for determining the time required for the formation of a seal after the fracturing activity of the source rock strata as an example.

[0055] Based on this, a first embodiment of the method for determining the time required for the formation and sealing of hydrocarbon source rock strata after fracture activity is proposed in this application. Please refer to [reference needed]. Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the method for determining the time required for the formation of a seal after fracture activity in the source rock strata of this application.

[0056] In this embodiment, the method for determining the time required for the formation of a seal after the fracture activity of the source rock layer includes the following steps:

[0057] S1: Determine the time curve of diagenesis degree of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone;

[0058] It should be noted that a fault zone refers to a structural zone formed during crustal movement due to rock fracturing and relative movement. It is a crucial conduit for oil and gas migration and sealing, influencing their preservation and accumulation. Overlying strata refer to the strata covering the fault zone. These strata exert stress on the fault zone through their own deposition and pressure, affecting its diagenetic process. Pressure refers to the stress exerted on the fault zone by the gravity of the overlying strata; this pressure increases over time with the deposition of strata. Diagenetic time refers to the time it takes for rocks within the fault zone to gradually solidify under depositional pressure. A longer diagenetic time results in a higher degree of rock solidification, ultimately affecting sealing. A diagenetic degree-time curve represents the change in rock solidification over time, reflecting the gradual solidification process of rocks within the fault zone under depositional pressure, and is an important basis for judging the sealing of the fault zone.

[0059] Specifically, geological data on the fault zone is collected, including the structure, sedimentary type, thickness, and sedimentary rate of the overlying strata. This information helps determine the sedimentary pressures experienced by the fault zone over different time periods. Over time, the continuous accumulation of overlying strata increases the pressure on the fault zone, affecting the diagenetic process. Based on this sedimentary and geological data, the changes in sedimentary pressure at each stage can be deduced, laying the foundation for diagenetic analysis.

[0060] Furthermore, by analyzing the solidification process of rocks in the fault zone, a time curve of diagenesis degree was established. With increasing time, the continuous accumulation of sedimentary pressure accelerates rock solidification, thereby improving its sealing capacity. In the early stages of diagenesis, the rocks are relatively loose and have poor sealing properties; as time progresses, the degree of solidification gradually increases, eventually reaching an ideal sealing state. Through continuous analysis at specific time points, the changes in rock solidification over time can be quantified, and this data can be transformed into a time curve, providing a basis for predicting the sealing properties of fault zones.

[0061] The time-series curve of diagenesis in the fault zone established through this step quantifies the evolution of rock solidification over time, avoiding the static estimation of diagenesis in traditional methods. Dynamic analysis allows for a clearer understanding of the rock's state at different sedimentary stages and its impact on sealing capacity. Furthermore, the curve reflects the direct effect of overlying strata pressure on the diagenetic process of the fault zone, making sealing predictions more consistent with actual geological conditions. This dynamic time-series curve can also improve the accuracy of sealing time prediction in oil and gas exploration, helping to identify which fault zone areas have high oil and gas preservation potential. By more accurately quantifying the diagenetic process of the fault zone, this method not only optimizes the development efficiency of oil and gas exploration but also effectively reduces exploration costs and risks.

[0062] S2: Determine the time curve of the degree of diagenesis of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock;

[0063] It should be noted that surrounding rock refers to the rock strata surrounding a fault zone. These strata, under geological processes, envelop the fault zone and, over time, deposit and compact, providing external support or influence to the fault zone. Static rock pressure refers to the static pressure exerted on the surrounding rock by the combined gravity of the surrounding rock and the overlying strata. It is typically used to describe a pressure state that does not change instantaneously with time or external variations. It increases with the depth of the surrounding rock and the duration of deposition. Diagenesis time refers to the time required for the surrounding rock to gradually solidify from a loose state under static rock pressure. The longer the diagenesis time, the higher the density and sealing capacity of the rock. The diagenesis time curve represents the change in the degree of solidification of the surrounding rock over time, used to quantify the diagenesis process. This curve reflects the diagenesis state of the surrounding rock at different time periods and plays a crucial role in predicting sealing properties.

[0064] Specifically, geological data on the surrounding rocks are collected, including their type, thickness, deposition rate, and depth. This data helps determine the static rock pressure and its variation over time. As the depositional process progresses, the static rock pressure on the surrounding rocks gradually increases, originating from the weight of the overlying strata. Greater pressure leads to faster solidification and a higher degree of diagenesis. Therefore, monitoring changes in static rock pressure over different time periods is crucial for analyzing the diagenetic process.

[0065] Furthermore, based on the change in static rock pressure over time, a time curve of the diagenetic degree of the surrounding rock was established. In the initial depositional stage, the degree of solidification of the surrounding rock is low, and the diagenetic time is short. As time progresses and sedimentary layers increase, pressure accumulates, and the diagenetic degree of the rock gradually increases. By converting these data into curves, the dynamic changes in the diagenetic degree of the surrounding rock can be reflected, laying the foundation for subsequent matching analysis with the diagenetic process of fault zones.

[0066] The time curve of surrounding rock diagenesis established through this step can dynamically display the solidification state of the surrounding rock at different time periods, avoiding the limitations of traditional static analysis. This curve helps quantify the evolution of the sealing capacity of the surrounding rock over time, making predictions more consistent with actual geological conditions. Furthermore, by analyzing in detail the impact of static rock pressure on the diagenesis process, it is possible to more accurately determine when the surrounding rock possesses the ability to support or seal fault zones. The dynamic analysis of this method can also improve the accuracy of matching fault zones with the diagenesis process of the surrounding rock, providing more reliable data support for further determining the sealing time of fault zones. Ultimately, this method not only improves the accuracy of identifying oil and gas reserves but also effectively reduces uncertainties and economic costs during exploration.

[0067] S3: Based on the time curve of diagenesis degree of the fault zone and the time curve of diagenesis degree of the surrounding rock, match the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal.

[0068] It should be noted that the time curve of diagenesis degree in the fault zone describes the change in the diagenesis degree of the rocks in the fault zone over time, reflecting the gradual solidification process of the rocks under the pressure of the overlying strata. The time curve of diagenesis degree in the surrounding rocks describes the change in the solidification of the surrounding rocks around the fault zone over time, revealing the diagenetic evolution process of the surrounding rocks under static rock pressure. Diagenesis degree refers to the degree of solidification of rocks from loose to dense under pressure and time, and it is an important parameter for judging the sealing capacity of rocks. Matching refers to comparing the diagenesis degree of the fault zone and the surrounding rocks at the same time point to find the time point when their diagenesis degrees are equal. The fault zone rock valve pressure refers to the minimum pressure value at which the rocks in the fault zone have sealing capacity, used to determine whether the fault zone can prevent the flow of oil and gas.

[0069] Specifically, the first step is to obtain time curves of diagenesis degree for both the fault zone and the surrounding rock, ensuring that both curves record changes in diagenesis degree within the same time span. As time progresses, the diagenesis processes of the fault zone and the surrounding rock may not be synchronized; therefore, it is necessary to compare their diagenesis degree over time intervals. At each time point, the diagenesis degree of the fault zone is compared with that of the surrounding rock to find the point where their diagenesis degrees are equal.

[0070] Furthermore, once a time point with equal diagenetic degree is found, it is necessary to determine the specific burial depth and threshold pressure of the fault zone rocks at that time. Since depth and pressure are closely related, the burial depth data of the fault zone rocks at that time point can be used to estimate the threshold pressure value at that time. This threshold pressure value reflects the critical moment when the fault zone rocks gradually develop sealing capacity during the diagenetic process and is an important parameter for predicting the sealing properties of the fault zone.

[0071] By matching the diagenetic time curves of the fault zone with those of the surrounding rocks, the time point at which the diagenetic states of the fault zone and the surrounding rocks coincide can be identified. This matching process not only comprehensively considers the interaction between the fault zone and the surrounding rocks but also dynamically tracks the progress of rock solidification, avoiding the biases of single-curve analysis. Compared to traditional static assessment methods, this matching analysis better reflects the complexity of actual geological processes. Furthermore, the threshold pressure at the matching point of equal diagenetic degree provides a quantitative basis for subsequent sealing assessment. This threshold pressure value represents the pressure conditions under which the fault zone rocks possess sealing capacity and is a key data point for predicting sealing time. Ultimately, this matching method can improve the accuracy of sealing time prediction, providing more reliable decision support for the identification of oil and gas preservation conditions and exploration and development.

[0072] S4: Determine the diagenesis time curve of the fault zone based on the rock valve pressure of the fault zone;

[0073] It should be noted that the valve pressure of a fault zone rock refers to the minimum pressure required for the rock at a specific depth and diagenetic state to achieve its sealing ability and prevent the flow of oil and gas. Diagenetic time refers to the time it takes for the rock in the fault zone to gradually solidify from a loose state. The longer the diagenetic time, the higher the degree of rock solidification, and the higher the valve pressure. The fault zone valve pressure-diagenetic time curve describes the change in valve pressure of the rock in the fault zone with diagenetic time, demonstrating the dynamic process of the rock transforming from a loose state to possessing sealing ability.

[0074] Specifically, the first step is to organize the rock threshold pressures and their corresponding time points obtained from the matching analysis of the fault zone and surrounding rock. These data reflect the threshold pressure values ​​of the rock at different diagenetic stages. Then, the threshold pressure values ​​at each time point are arranged in chronological order to form a preliminary curve showing the change of threshold pressure over time.

[0075] Furthermore, the preliminary curves are analyzed and smoothed to eliminate fluctuations and errors in the data, ensuring that the curves better reflect the logic of actual geological processes. The smoothed valve pressure-diagenesis time curve can more intuitively reflect the evolution of the rock's sealing capacity. The curves show that as time progresses and the degree of rock solidification increases, the valve pressure gradually increases until it reaches the valve pressure value at which the rock possesses sealing capacity.

[0076] The fault zone valve pressure diagenesis time curve generated through this step dynamically displays the changing trend of valve pressure in the fault zone rocks during diagenesis. Compared to traditional static analysis, this dynamic curve more accurately reflects the process of rock solidification and pressure changes, providing a quantitative basis for predicting sealing time. The smoothed curve reduces data errors, ensuring more reliable results. Furthermore, this curve helps to clarify when the fault zone rocks acquire sealing capacity, providing more accurate sealing time predictions for oil and gas exploration. This process not only improves prediction accuracy but also better identifies areas with high oil and gas preservation potential, thereby optimizing exploration decisions and reducing costs and risks.

[0077] This embodiment determines the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone; it also determines the diagenesis time curve of the surrounding rocks based on the static rock pressure and diagenesis time of the surrounding rocks; based on the diagenesis time curves of the fault zone and the surrounding rocks, it matches the diagenesis degree of the fault zone with that of the surrounding rocks to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal; based on the rock valve pressure of the fault zone, it determines the valve pressure diagenesis time curve of the fault zone; and based on the preset maximum valve pressure of the source rock and the valve pressure diagenesis time curve, it determines the target sealing time. This embodiment comprehensively analyzes the diagenesis time curves of the fault zone and the surrounding rocks, matches their diagenesis degree to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal, and further establishes a valve pressure-diagenesis time curve, which is compared with the maximum valve pressure of the source rock to accurately determine the sealing time. This process dynamically quantifies the evolution of the sealing capacity of the fault zone, avoids the errors of traditional static estimation, improves the scientificity and accuracy of prediction, and optimizes the efficiency and cost of exploration and development.

[0078] Based on the first embodiment described above, a second embodiment of the method for determining the time required for the formation and sealing of hydrocarbon source rock strata after fracture activity is proposed. Please refer to... Figure 2 , Figure 2 This is a schematic diagram of a sub-process in the second embodiment of the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in this application.

[0079] like Figure 2 As shown, in this embodiment, step S1 includes:

[0080] S11: Obtain geological data of the fault zone, including information on the stratigraphic structure of the fault zone, the depositional rate of the overlying strata, and the depositional type and thickness;

[0081] S12: Determine the changes in formation pressure based on the geological data of the fault zone;

[0082] S13: Determine the diagenetic process of the fault zone based on the changes in formation pressure;

[0083] S14: Based on the diagenetic process of the rocks in the fault zone, analyze the diagenetic state of the fault zone at different time periods and determine the time curve of the degree of diagenesis of the fault zone.

[0084] It should be noted that fault zone geological data refers to all geological information related to the fault zone, including its internal structure, the thickness of the overlying strata, sedimentary rates, and rock types and properties. This data provides the foundation for subsequent pressure analysis and diagenetic state studies. The overlying strata sedimentary rate refers to the rate at which the strata overlying the fault zone accumulate over time. This rate affects the pressure changes within the strata and, consequently, the solidification process of the fault zone rocks. Sedimentary type and thickness refer to the material composition of the strata, such as mudstone or sandstone; thickness reflects the degree of accumulation of different strata. These factors, along with the sedimentary rate, collectively determine the pressure exerted on the fault zone. Formation pressure, generated by the weight and depth of the overlying strata, changes continuously with increasing sedimentation and is the primary driving force of the diagenetic process. The diagenetic process refers to the gradual solidification of rocks from a loose state to a dense state under pressure. Solidified rocks possess a certain sealing capacity, helping to prevent the flow of oil and gas. The diagenetic state refers to the degree of solidification of rocks within a certain time period, reflecting the density and sealing capacity of the rocks.

[0085] Specifically, detailed geological data related to the fault zone was obtained, including information on the fault zone's stratigraphic structure, the depositional rate, sedimentary type, and thickness of the overlying strata. The depositional rate determines the rate of increase in formation pressure, while combinations of different sedimentary types and thicknesses influence the rock solidification process. This information was obtained through field exploration, geological model analysis, and experimental data collection. Based on the acquired geological data, the changes in overlying formation pressure over time were analyzed. In the early stages of strata deposition, the pressure was low, and the solidification effect on the rocks was not significant; as the sedimentary layer thickened, the pressure gradually increased, accelerating the compaction and solidification of the rocks in the fault zone. Based on this analysis, the diagenetic process of the fault zone rocks was gradually depicted, demonstrating their solidification state at different time points.

[0086] Furthermore, by analyzing the diagenetic state of the rocks in the fault zone over time periods, the degree of solidification over time was determined. This data was then converted into a diagenetic degree-time curve, demonstrating the solidification evolution of the rocks in the fault zone at different stages. This curve will provide crucial information for assessing the sealing capacity and sealing time of the fault zone.

[0087] Based on detailed geological data, this method enables dynamic analysis of the diagenetic process of fault zone rocks, avoiding errors inherent in traditional static estimations. By establishing diagenetic degree-time curves, it accurately demonstrates how the solidification state of fault zone rocks evolves with changes in depositional pressure and time. This dynamic analysis provides a reliable quantitative basis for determining the closure time of fault zones. Furthermore, this method comprehensively considers key factors such as depositional rate, depositional type, and thickness, making the prediction process more closely aligned with actual geological conditions. Ultimately, this process helps improve the accuracy and efficiency of predicting hydrocarbon preservation conditions, optimize exploration and development decisions, and reduce risks and costs during the exploration process.

[0088] Based on the first embodiment described above, step S2 includes:

[0089] S21: Obtain geological data of the surrounding rock, including the type and thickness of the surrounding rock strata, the deposition rate of the surrounding rock, and the burial depth of the surrounding rock;

[0090] S22: Based on the surrounding rock geological data, determine the static rock pressure at different time periods;

[0091] S23: Determine the diagenetic process of the surrounding rock based on the static rock pressure at different time periods;

[0092] S24: Based on the diagenesis process of the surrounding rock, analyze the diagenesis state of the surrounding rock at different time periods, and determine the time curve of the degree of diagenesis of the surrounding rock.

[0093] It should be noted that surrounding rock geological data refers to the relevant geological information of the rock strata surrounding the fault zone, including stratum type, thickness, sedimentation rate, and burial depth. This data is used to analyze the static rock pressure of the surrounding rock and its changes over time. Stratigraphic type refers to the type of rock constituting the surrounding rock, such as sandstone and mudstone; thickness indicates the degree of deposition of these strata at different times, directly affecting pressure accumulation. Sedimentation rate refers to the speed at which the surrounding rock is deposited over time. The rate of deposition affects the rate of pressure increase, thus affecting the progress of the diagenetic process. Burial depth refers to the vertical depth of the surrounding rock. As depth increases, the static rock pressure borne by the surrounding rock also increases. Static rock pressure refers to the static pressure exerted on the surrounding rock by the weight of the overlying rock strata during deposition. Static rock pressure is the main driving force for the solidification (diagenesis) of the surrounding rock. The diagenetic process refers to the process by which the surrounding rock gradually solidifies into dense rock under the action of static rock pressure, giving it a certain sealing capacity. Diagenetic state refers to the degree of solidification of the surrounding rock at a certain time period, reflecting whether the surrounding rock possesses sufficient density and sealing properties.

[0094] Specifically, geological data such as stratigraphic type, thickness, sedimentation rate, and burial depth of the surrounding rock are obtained. This data typically comes from field exploration, geological analysis, and stratigraphic monitoring. The burial depth and sedimentation rate of the surrounding rock determine the changes in its static rock pressure at different times. Over time, the static rock pressure on the surrounding rock continuously increases, reflecting the process of continuous compaction and solidification. Based on the collected data, the static rock pressure on the surrounding rock is calculated for each time period. In the initial stage, the sedimentary layer of the surrounding rock is relatively thin, the static rock pressure is low, and the diagenesis process is slow; as sediments accumulate, the static rock pressure of the surrounding rock increases over time, and the solidification rate gradually increases. By analyzing these changes, the diagenetic state of the surrounding rock at different time periods is determined, and the degree of solidification at each stage is identified.

[0095] Furthermore, the diagenetic state data of the surrounding rock at different time periods were plotted as a diagenetic degree-time curve to show the change in the solidification progress of the surrounding rock over time. The curve is initially flat, indicating a low degree of diagenesis; as time progresses and pressure increases, the curve gradually rises, reflecting a gradual increase in the degree of diagenesis of the surrounding rock. Ultimately, this curve can be used to assess whether the surrounding rock has the ability to support and seal the fault zone.

[0096] This process established a dynamic curve showing the change in the diagenetic degree of the surrounding rock over time, enabling precise quantitative analysis of the diagenetic state of the surrounding rock. This dynamic analysis avoids the shortcomings of traditional static estimation, which neglects changes in sedimentation rate and pressure, making the prediction of the diagenetic process more closely aligned with actual geological conditions. Furthermore, the time curve of the diagenetic degree of the surrounding rock provides crucial data for assessing its supporting capacity during fault zone closure. This process makes the matching analysis of the diagenetic state of the fault zone and the surrounding rock more accurate, improving the accuracy of closure time prediction, thereby optimizing the efficiency and decision-making in oil and gas exploration and reducing uncertainty and costs during the exploration process.

[0097] This embodiment determines the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone; it also determines the diagenesis time curve of the surrounding rocks based on the static rock pressure and diagenesis time of the surrounding rocks; based on the diagenesis time curves of the fault zone and the surrounding rocks, it matches the diagenesis degree of the fault zone with that of the surrounding rocks to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal; based on the rock valve pressure of the fault zone, it determines the valve pressure diagenesis time curve of the fault zone; and based on the preset maximum valve pressure of the source rock and the valve pressure diagenesis time curve, it determines the target sealing time. This embodiment comprehensively analyzes the diagenesis time curves of the fault zone and the surrounding rocks, matches their diagenesis degree to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal, and further establishes a valve pressure-diagenesis time curve, which is compared with the maximum valve pressure of the source rock to accurately determine the sealing time. This process dynamically quantifies the evolution of the sealing capacity of the fault zone, avoids the errors of traditional static estimation, improves the scientificity and accuracy of prediction, and optimizes the efficiency and cost of exploration and development.

[0098] Based on the second embodiment described above, a third embodiment of the method for determining the time required for the formation and sealing of hydrocarbon source rock strata after fracture activity is proposed in this application. Please refer to... Figure 3 , Figure 3 This is a schematic diagram of a sub-process in the third embodiment of the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in this application.

[0099] In this embodiment, step S3 includes:

[0100] S31: Based on the time curve of the diagenesis degree of the fault zone and the time curve of the diagenesis degree of the surrounding rock, the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock are synchronously compared at each time point;

[0101] S32: Based on the comparison results, determine whether there is an intersection point between the time curve of the diagenesis degree of the fault zone and the time curve of the diagenesis degree of the surrounding rock;

[0102] S33: If so, determine the rock pressure of the fault zone based on the burial depth of the rock in the fault zone corresponding to the intersection point.

[0103] It should be noted that the diagenesis time curve describes the change in the diagenesis degree of the fault zone or surrounding rock over time, reflecting the evolution of the rock solidification state. Synchronous comparison refers to comparing the diagenesis degree of the fault zone and the surrounding rock at the same time point to discover whether there is a consistent solidification state between them. The intersection point refers to the point in the diagenesis time curve where the diagenesis degree of the fault zone and the surrounding rock are equal. This intersection point indicates that their solidification states are consistent at that time. The fault zone rock valve pressure refers to the sealing capacity of the fault zone rock at the burial depth of the intersection point, that is, the minimum pressure required to prevent the flow of oil and gas.

[0104] Specifically, time curves of diagenesis degree for the fault zone and surrounding rock are obtained, ensuring that the two curves cover the same time range. At each time point, the diagenesis degree of the fault zone and surrounding rock is synchronously compared to determine whether their solidification states are consistent. This process can be completed by progressively examining the data at each time point to find the moment when the diagenesis degree reaches the same level.

[0105] Furthermore, through comparative analysis, if an intersection point is found between the diagenesis curve of the fault zone and the diagenesis curve of the surrounding rock, it indicates that the solidification state of the fault zone and the surrounding rock is the same at that time point. In this case, it is necessary to record the burial depth of the fault zone rock corresponding to this intersection point, as the burial depth directly affects the magnitude of the valve pressure. Based on this burial depth value, the valve pressure of the fault zone rock is determined. This valve pressure reflects the sealing capacity gradually acquired by the fault zone rock during the solidification process.

[0106] By synchronously comparing the diagenesis time curves of the fault zone and surrounding rocks at each time point and identifying the intersection points, it is possible to accurately determine when the fault zone rocks and surrounding rocks reach a consistent solidification state. Compared to single-curve analysis, this dual-comparison method more comprehensively reflects the mutual influence and dynamic evolution between the fault zone and surrounding rocks. The discovery and analysis of intersection points provide crucial data on the rock valve pressure of the fault zone. This data forms the basis for determining when the fault zone possesses sealing capacity, providing a quantitative basis for subsequent sealing time prediction. This matching analysis method improves the accuracy and reliability of sealing prediction, helps identify areas with high oil and gas preservation potential, optimizes exploration and development decisions, and reduces risks and costs during the exploration process.

[0107] Based on the second embodiment described above, in this embodiment, step S4 includes:

[0108] S41: Obtain the time point corresponding to the intersection point;

[0109] S42: Based on the time point and the rock valve pressure of the fault zone, determine the trend of the change of the rock valve pressure of the fault zone over time;

[0110] S43: Based on the aforementioned trend, the rock valve pressures of the fracture zone corresponding to each time point are arranged in chronological order to obtain a preliminary curve;

[0111] S44: Smooth the preliminary curve to obtain the diagenesis time curve of the fracture zone.

[0112] It should be noted that the intersection point refers to the point in time on the time curve of the diagenesis degree of the fault zone and the surrounding rock where their diagenesis degrees are equal. This intersection point reflects the consistency of the solidification state of the fault zone and the surrounding rock, and is a key node for analyzing the change of valve pressure over time. The valve pressure of the fault zone rock refers to the pressure value of the fault zone rock at different times and burial depths, and is a key indicator of the fault zone's sealing capacity. The trend describes the overall direction and law of the change of the fault zone rock valve pressure over time, providing a basis for judging the evolution of sealing capacity. The preliminary curve is an unprocessed curve formed by arranging the fault zone rock valve pressures corresponding to multiple time points in chronological order, showing the basic trend of valve pressure change. Smoothing is performed to remove noise or abnormal fluctuations in the preliminary curve through algorithms or mathematical methods, making the curve more consistent with the trend of actual geological processes.

[0113] Specifically, based on the intersection points found in the previous step, record the corresponding time points and the valve pressure of the fault zone rocks at those time points. Now, it's necessary to analyze the valve pressure variation trends between multiple intersection points to understand how the valve pressure evolves over time. This analysis will demonstrate the pressure growth pattern of the fault zone rocks during diagenesis. Arrange each time point and the corresponding fault zone rock valve pressure in chronological order to generate a preliminary valve pressure versus time curve. This preliminary curve shows the basic trend of valve pressure over time, but may contain fluctuations and outliers due to data acquisition errors or other reasons.

[0114] Furthermore, to ensure the curve better reflects the logic of actual geological processes, the initial curve needs to be smoothed. Smoothing eliminates noise and outliers in the data, making the curve more coherent and natural. This processed valve-pressure diagenesis time curve can visually demonstrate the solidification process of rocks in the fault zone and the change in their sealing capacity over time.

[0115] By analyzing the time points and valve pressure data at the intersection points, the evolution of the sealing capacity of fault zone rocks can be accurately identified, providing a scientific basis for the changing trend of valve pressure over time. The initial curve generation demonstrates the dynamic changes in valve pressure during rock solidification, while the smoothed curve avoids interference from data fluctuations, making the results more consistent with reality. The final valve pressure-diagenesis time curve not only improves the accuracy and precision of sealing time prediction but also provides a quantitative basis for identifying oil and gas conservation areas. This analytical method helps optimize exploration and development strategies, reduce unnecessary drilling costs, and improve the scientific nature and efficiency of decision-making.

[0116] Based on the second embodiment described above, in this embodiment, step S5 includes:

[0117] S51: Take the time point on the valve pressure diagenesis time curve that is equal to the maximum valve pressure of the preset source rock layer as the target point;

[0118] S52: Obtain the time corresponding to the target point;

[0119] S53: Determine the target closure time based on the time corresponding to the target point and the time when the fracture stops.

[0120] It should be noted that the valve pressure diagenesis time curve describes the change of valve pressure in the fracture zone rocks over time, reflecting the pressure increase trend during diagenesis. This curve is used to determine when the rocks acquire sealing capacity. The maximum valve pressure of the source rock layer refers to the minimum valve pressure required for the source rock layer at a certain depth. Only when the valve pressure of the fracture zone rocks reaches or exceeds this valve pressure can the flow and leakage of oil and gas be effectively prevented. The target point refers to the point on the valve pressure diagenesis time curve where the valve pressure of the fracture zone rocks equals the preset maximum valve pressure of the source rock layer. This point marks the moment when the fracture zone rocks reach a sealed state during diagenesis. The target sealing time is the time interval between the moment the fracture stops and the target point, reflecting the time required for the fracture zone rocks to form a seal after the fracture stops.

[0121] Specifically, on the generated valve-pressure diagenesis time curve, the time point equal to the preset maximum valve pressure of the source rock layer is identified. This time point indicates that the valve pressure of the fault zone rocks has reached the sealing standard required for the source rock layer, demonstrating that the rocks possess the ability to prevent oil and gas flow. After finding the target point, its corresponding specific time is recorded. This time represents the moment when the fault zone rocks first achieve sealing capability during the diagenesis process, and is key data for sealing time analysis.

[0122] Furthermore, the time at the target point is compared with the time when the fracture stopped, and the time difference between the two is calculated. This time difference is the target closure time, which is the time required for the rock in the fault zone to reach a closed state after the fracture stops.

[0123] By comparing the valve-pressure diagenesis time curve with the maximum valve pressure of the source rock, it is possible to accurately determine when the rocks in the fault zone possess sealing capacity. This process quantifies the prediction of the sealing state into specific time points, avoiding the subjectivity of traditional experience-based judgments. Obtaining the time corresponding to the target point and calculating the target sealing time makes the prediction of sealing time more accurate and scientific. Determining the target sealing time provides a crucial decision-making basis for oil and gas exploration, helping to identify which areas are suitable for oil and gas preservation and optimize development plans. Through this method, explorers can more efficiently assess the sealing capacity of fault zones, reduce unnecessary drilling costs and risks, and improve the success rate of oil and gas exploration.

[0124] This embodiment determines the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone; it also determines the diagenesis time curve of the surrounding rocks based on the static rock pressure and diagenesis time of the surrounding rocks; based on the diagenesis time curves of the fault zone and the surrounding rocks, it matches the diagenesis degree of the fault zone with that of the surrounding rocks to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal; based on the rock valve pressure of the fault zone, it determines the valve pressure diagenesis time curve of the fault zone; and based on the preset maximum valve pressure of the source rock and the valve pressure diagenesis time curve, it determines the target sealing time. This embodiment comprehensively analyzes the diagenesis time curves of the fault zone and the surrounding rocks, matches their diagenesis degree to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal, and further establishes a valve pressure-diagenesis time curve, which is compared with the maximum valve pressure of the source rock to accurately determine the sealing time. This process dynamically quantifies the evolution of the sealing capacity of the fault zone, avoids the errors of traditional static estimation, improves the scientificity and accuracy of prediction, and optimizes the efficiency and cost of exploration and development.

[0125] In one embodiment, the specific implementation steps are as follows:

[0126] (1) Determination of the valve pressure of mudstone samples from the source rock layer

[0127] Mudstone samples at different depths in the target area were selected, and valve pressure tests were conducted using a rock valve pressure testing device to establish the relationship between mudstone valve pressure and burial depth.

[0128] P d =f(D)

[0129] In the formula: Pd is the mudstone valve pressure in the source rock layer, Pa; D is the burial depth, m.

[0130] (2) Calculation of diagenetic degree of rocks within the fault zone

[0131] Based on the actual geological characteristics of the study area, a geological model for calculating rock valve pressure within the fault zone was established. The burial depth of any point M within the fault zone is D, and the rock formation at point M begins at the t3 stratigraphic deposition period. Based on the regional sedimentary characteristics, the average depositional rates of stratigraphy ①, stratigraphy ②, and stratigraphy ③ can be obtained as V1, V2, and V3, respectively, thus determining the relationship between the diagenesis time and D.

[0132]

[0133] In the formula: DM is the burial depth of point M, m; D0 is the vertical distance between point M and the top surface of stratum ④, m; D1 is the vertical distance between point M and the top surface of stratum ③, m; D2 is the vertical distance between point M and the top surface of stratum ②, m; t0 is the current deposition time, Ma; t1 is the initial deposition time of stratum ①, Ma; t2 is the initial deposition time of stratum ②, Ma; t3 is the initial deposition time of stratum ③, Ma.

[0134] Establish the relationship between the burial depth of point M and the normal stress at point M in the cross section.

[0135] P fi =(ρ r -ρ w )gD M cosθ

[0136] In the formula: Pfi is the cross-sectional normal stress of the overlying rock layer acting on point M, Pa; ρr is the skeleton density of the overlying sedimentary rock layer, kg / m3; ρw is the density of formation water, kg / m3; g is the gravitational acceleration, m / s2; θ is the fault dip angle.

[0137] The relationship between the influence index of the normal stress at point M on the degree of diagenesis and the diagenesis time is obtained based on the above formula.

[0138] In the formula: Qf is the influence index of cross-sectional normal stress on diagenesis degree; Pf is the cross-sectional normal stress, Pa.

[0139] (3) Calculation of the degree of diagenesis of the surrounding rock

[0140] The degree of diagenesis at any point N in the surrounding rock can be calculated. The relationship between the burial depth of point N and the deposition time can be determined based on the deposition rate of all strata above point N and the deposition time.

[0141]

[0142] In the formula: Hi is the burial depth of the bottom surface of stratum i, m; ti is the initial deposition time of stratum i, Ma; i = 1, 2, 3, ...

[0143] Based on the method for calculating static rock pressure in the surrounding rock, the relationship between static rock pressure and burial depth can be obtained. Based on this, by integrating the deposition time of different strata, the influence index of static rock pressure on the diagenesis degree of point N in the surrounding rock can be obtained.

[0144] P ri =(ρ r -ρ w )gH i

[0145] In the formula: Pri is the static rock pressure of the surrounding rock of stratum i, in Pa.

[0146]

[0147] In the formula: Qr is the influence index of static rock pressure on the degree of diagenesis.

[0148] (4) Calculation of rock valve pressure within the fault zone

[0149] According to the above formula, the influence index of the normal stress of the rock cross section on the degree of diagenesis in a fault zone with any known burial depth is calculated. The point where the influence index of the normal stress of the cross section on the degree of diagenesis and the influence index of the static rock pressure on the degree of diagenesis of the surrounding rock are equal represents that the rocks in the fault zone and the surrounding rocks have the same degree of diagenesis and the same threshold pressure. Using the above formula, the burial depth of the rocks in the surrounding rocks with the same degree of diagenesis as the rocks in the fault zone is calculated, and the threshold pressure of the surrounding rocks at this burial depth is calculated, which is the threshold pressure of the rocks in the fault zone.

[0150] (5) Valve pressure calculation of mudstone source rock layer

[0151] Based on the above formula, the relationship between mudstone valve pressure and burial depth is obtained, and then the valve pressure of rocks in the source rock layer at different burial depths is calculated.

[0152] (6) Determination of the time required for closure to form after fracture activity

[0153] Based on the above method, the relationship between rock valve pressure and diagenesis time in the fault zone is established. Based on the calculation results of the valve pressure in the source rock layer, the maximum value of the source rock layer valve pressure is determined. The time corresponding to the point on the curve of relationship between rock valve pressure and diagenesis time in the fault zone that is greater than the maximum value of the source rock layer valve pressure is the time required for the source rock layer to form a seal after the fault activity.

[0154] This application also provides a device for determining the time required for the formation of a seal after fracture activity in a hydrocarbon source rock stratum. Please refer to... Figure 4 , Figure 4 This is a schematic diagram of the module structure of the device for determining the time required for the formation of a seal after fracture activity in the source rock strata, according to an embodiment of this application. The device includes:

[0155] The fault zone curve module 401 is used to determine the time curve of the degree of diagenesis of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone.

[0156] The surrounding rock curve module 402 is used to determine the diagenesis time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock.

[0157] The diagenesis matching module 403 is used to match the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock based on the diagenesis degree time curve of the fault zone and the diagenesis degree time curve of the surrounding rock, and determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal.

[0158] The fault zone valve pressure module 404 is used to determine the fault zone valve pressure diagenesis time curve based on the fault zone rock valve pressure.

[0159] The target module 405 is used to determine the target sealing time based on the preset maximum valve pressure of the source rock layer and the valve pressure diagenesis time curve.

[0160] The device for determining the time required for the formation of a closed state after fracture activity in a source rock stratum provided in this application adopts the method for determining the time required for the formation of a closed state after fracture activity in the above embodiments, and can solve the technical problem of how to improve the prediction accuracy of the time required to reach a closed state after the fracture stops. Compared with the prior art, the beneficial effects of the device for determining the time required for the formation of a closed state after fracture activity in a source rock stratum provided in this application are the same as the beneficial effects of the method for determining the time required for the formation of a closed state after fracture activity in a source rock stratum provided in the above embodiments, and other technical features in the device for determining the time required for the formation of a closed state after fracture activity in a source rock stratum are the same as the features disclosed in the method of the above embodiments, and will not be repeated here.

[0161] This application provides a device for determining the time required for the formation of a seal after a fracture in a hydrocarbon source rock stratum. The device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method for determining the time required for the formation of a seal after a fracture in the hydrocarbon source rock stratum as described in the above embodiments.

[0162] The following is for reference. Figure 5 , Figure 5 This is a schematic diagram of the hardware operating environment of the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in the embodiments of this application. It shows a schematic diagram of the structure of the device suitable for implementing the method for determining the time required for the formation of a seal after the fracture activity of the source rock strata in the embodiments of this application. Figure 5 The device shown for determining the time required for the formation of a seal after fracture activity in the source rock strata is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments in this application.

[0163] In particular, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. When the computer program is executed by the processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0164] The device for determining the time required for the formation of a closed state after fracture activity in a hydrocarbon source rock stratum provided in this application, employing the method described in the above embodiments, can solve the technical problem of how to improve the prediction accuracy of the time required to reach a closed state after fracture cessation. Compared with the prior art, the beneficial effects of the device for determining the time required for the formation of a closed state after fracture activity in a hydrocarbon source rock stratum provided in this application are the same as those of the method described in the above embodiments. Furthermore, other technical features of this device are the same as those disclosed in the previous embodiment method, and will not be elaborated upon here.

[0165] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0166] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0167] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the method for determining the time required for the formation of a seal after the fracture activity of the source rock layer in the above embodiments.

[0168] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by a device for determining the time required for closure after fracture activity in a source rock stratum, the device performs the following: 1) determines a time curve for the degree of diagenesis of the fracture zone based on the pressure of the overlying strata and the diagenesis time of the fracture zone; 2) determines a time curve for the degree of diagenesis of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock; 3) matches the degree of diagenesis of the fracture zone and the degree of diagenesis of the surrounding rock based on the time curves, determining the rock valve pressure of the fracture zone corresponding to the time point when the diagenesis degrees are equal; 4) determines a time curve for the valve pressure diagenesis of the fracture zone based on the rock valve pressure; and 5) determines the target closure time based on the preset maximum valve pressure of the source rock stratum and the time curve for the valve pressure diagenesis. Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0169] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0170] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0171] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the method for determining the time required for closure after fracture activity in the aforementioned source rock strata. This method can solve the technical problem of how to improve the prediction accuracy of the time required to reach a closed state after fracture cessation. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the method for determining the time required for closure after fracture activity in the aforementioned embodiments, and will not be elaborated upon here.

[0172] This application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the method described above for determining the time required for the formation of a seal after fracture activity in a hydrocarbon source rock layer.

[0173] The computer program product provided in this application can solve the technical problem of how to improve the prediction accuracy of the time required for a closure state to be reached after a fracture has stopped. Compared with the prior art, the beneficial effects of the computer program product provided in the embodiments of this application are the same as the beneficial effects of the method for determining the time required for closure to form after fracture activity in hydrocarbon source rock strata provided in the above embodiments, and will not be repeated here.

[0174] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A method for determining the time required for the formation of a seal after fracture activity in a hydrocarbon source rock stratum, characterized in that, The method includes: The time curve of diagenesis degree of the fault zone is determined based on the pressure of the overlying strata and the diagenesis time of the fault zone. Determine the time curve of the degree of diagenesis of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock; Based on the time curve of diagenesis degree of the fault zone and the time curve of diagenesis degree of the surrounding rock, the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock are matched to determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal. Based on the rock valve pressure of the fracture zone, determine the diagenesis time curve of the fracture zone valve pressure; The target sealing time is determined based on the preset maximum valve pressure of the source rock layer and the valve pressure diagenesis time curve.

2. The method of claim 1, wherein, The step of determining the diagenesis time curve of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone includes: Obtain geological data of the fault zone, including information on the stratigraphic structure of the fault zone, the depositional rate of the overlying strata, and the depositional type and thickness; Based on the geological data of the fault zone, determine the changes in formation pressure; Based on the changes in formation pressure, the diagenetic process of the fault zone is determined; Based on the diagenetic process of the rocks in the fault zone, the diagenetic state of the fault zone at different time periods is analyzed to determine the time curve of the degree of diagenesis of the fault zone.

3. The method of claim 1, wherein, The step of determining the diagenesis time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock includes: Acquire surrounding rock geological data, including surrounding rock strata type and thickness, surrounding rock deposition rate, and surrounding rock burial depth; Based on the surrounding rock geological data, the static rock pressure at different time periods was determined; The diagenetic process of the surrounding rock is determined based on the static rock pressure at different time periods. Based on the diagenetic process of the surrounding rock, the diagenetic state of the surrounding rock at different time periods is analyzed to determine the time curve of the degree of diagenesis of the surrounding rock.

4. The method of claim 1, wherein, The step of matching the diagenetic degree of the fault zone with the diagenetic degree of the surrounding rock based on the time curve of diagenetic degree of the fault zone and the time curve of diagenetic degree of the surrounding rock, and determining the rock valve pressure of the fault zone corresponding to the time point when the diagenetic degree is equal, includes: Based on the time curve of diagenesis of the fault zone and the time curve of diagenesis of the surrounding rock, the diagenesis of the fault zone and the diagenesis of the surrounding rock are synchronously compared at each time point; Based on the comparison results, it is determined whether there is an intersection point between the time curve of the diagenesis degree of the fault zone and the time curve of the diagenesis degree of the surrounding rock; If so, the rock pressure of the fault zone is determined based on the burial depth of the rock in the fault zone corresponding to the intersection point.

5. The method of claim 4, wherein, The step of determining the diagenesis time curve of the fault zone based on the rock valve pressure of the fault zone includes: Obtain the time point corresponding to the intersection point; Based on the time point and the rock valve pressure of the fault zone, determine the trend of the rock valve pressure of the fault zone over time; Based on the aforementioned trend, the rock valve pressures of the fault zone corresponding to each time point are arranged in chronological order to obtain a preliminary curve; The preliminary curve is smoothed to obtain the valve compression time curve of the fracture zone.

6. The method according to any one of claims 1 to 5, characterized in that, The step of determining the target sealing time based on the preset maximum valve pressure of the source rock formation and the valve pressure-diagenesis time curve includes: The time point on the valve pressure diagenesis time curve that is equal to the maximum valve pressure of the preset hydrocarbon source rock layer is taken as the target point; Obtain the time corresponding to the target point; The target closure time is determined based on the time corresponding to the target point and the time when the fracture stops.

7. A device for determining the time required to form a seal after a source rock layer has been fractured, comprising: The device includes: The fault zone curve module is used to determine the time curve of the degree of diagenesis of the fault zone based on the pressure of the overlying strata and the diagenesis time of the fault zone. The surrounding rock curve module is used to determine the diagenesis time curve of the surrounding rock based on the static rock pressure and the diagenesis time of the surrounding rock. The diagenesis matching module is used to match the diagenesis degree of the fault zone and the diagenesis degree of the surrounding rock based on the time curve of diagenesis degree of the fault zone and the time curve of diagenesis degree of the surrounding rock, and determine the rock valve pressure of the fault zone corresponding to the time point when the diagenesis degree is equal. The fault zone valve pressure module is used to determine the fault zone valve pressure diagenesis time curve based on the fault zone rock valve pressure. The target module is used to determine the target sealing time based on the preset maximum valve pressure of the source rock layer and the valve pressure diagenesis time curve.

8. A computer device, comprising: The device includes: a memory, a processor, and a program for determining the time required for closure to form after fracture activity of a source rock layer, stored in the memory and executable on the processor, the program being configured to implement the steps of the method for determining the time required for closure to form after fracture activity of a source rock layer as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium stores a program for determining the time required for the formation of a closure after a fracture activity in a hydrocarbon source rock layer. When the processor executes the program for determining the time required for the formation of a closure after a fracture activity in a hydrocarbon source rock layer, it implements the steps of the method for determining the time required for the formation of a closure after a fracture activity in a hydrocarbon source rock layer as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the method for determining the time required for closure to form after fracture activity in the source rock strata as described in any one of claims 1 to 6.

Images