Method and device for determining spatio-temporal evolution of diagenetic fluid of clastic rock in broken basin

Abstract

The invention provides a method and a device for determining spatio-temporal evolution of clastic rock diagenetic fluid in a fractured basin. The method for determining spatio-temporal evolution of clastic rock diagenetic fluid in the fractured basin comprises the following steps: acquiring authigenic minerals at different structural positions of the fractured basin; wherein the authigenic minerals comprise carbonate, quartz secondary enlargement and anhydrite; determining the paleofluid temperature of the authigenic mineral according to the uniform temperature of the saline inclusion of the authigenic mineral and the uniform temperature of the hydrocarbon inclusion; and determining the spatio-temporal evolution process of the clastic rock diagenetic fluid of the broken basin according to the paleo-fluid temperature, the predetermined burying history of the broken basin and the paleo-ground temperature gradient. According to the method, the activity time range of diagenesis fluid in clastic rock reservoirs at different structural positions is determined, so that fluid difference evolution modes of different structural positions of the broken lake basin are established, and technical support is finally provided for predicting causes of high-quality clastic rock reservoirs.

Description

Technical Field

[0001] The present application belongs to the field of oil and gas exploration technology, and specifically relates to a method and device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin. Background Art

[0002] The diagenesis of clastic reservoirs during burial is crucial for determining porosity development and the genesis of high-quality reservoirs. Differences in regional location, sedimentary facies, source rock development, formation overpressure, and structural faults result in variations in the original grain composition, diagenetic fluid environment, and source-reservoir configuration of different sand bodies within deep burial faulted lake basins. Consequently, sand bodies exhibit significant variations in the intensity and duration of fluid interaction. Therefore, the study of diagenetic fluids in clastic reservoirs within faulted lake basins can help reveal the characteristics and genesis of different reservoir types.

[0003] The invention patent application number CN202010581516.5 is titled "Method for Determining the Evolution History of Diagenetic Fluids." The research object of this patent is the diagenetic fluid characteristics and evolution history of diagenetic fluids in marine carbonate rocks. The main contents include: an introduction to determining the activity time of diagenetic fluids in various rock thin sections based on the homogenization temperature of fluid inclusions; and ultimately, determining the diagenetic fluid evolution history reflected in the rock sample based on the diagenetic stage, the diagenetic fluid information and fluid source, and the activity time of the diagenetic fluid. The shortcomings of this invention: Compared with marine carbonate rocks, clastic reservoirs generally have more complex diagenetic reaction processes and more types of diagenetic authigenic minerals. Therefore, detecting the homogenization temperature of brine inclusions in authigenic minerals in clastic reservoirs can help clarify the activity and conversion time of diagenetic fluids of different properties. In addition, this invention does not combine the actual geological background factors to comprehensively consider and analyze the impact of tectonic evolution differences on the temporal and spatial distribution of the diagenetic fluid evolution history. Summary of the Invention

[0004] Currently, the method for determining the evolutionary history of diagenetic fluids is mainly based on combining the homogenization temperature of brine inclusions within diagenetic authigenic minerals with the regional burial history and paleotemperature of the formation to determine the activity range of diagenetic fluids of different properties in the region. However, due to the influence of regional tectonic position and sample depth differences, the homogenization temperature of brine inclusions in samples from different regions of the same layer is different, so the measured inclusion temperature data results cannot be combined and projected; and for wells in different tectonic positions in a region, the same burial history cannot be simply used to determine the time of diagenetic fluid activity. Therefore, in response to the above-mentioned problems in the study of clastic rock diagenetic fluids, the purpose of this invention is to propose a method for determining the temporal and spatial differential evolution of diagenetic fluids in clastic rocks in faulted lake basins.

[0005] As can be seen from the above description, one objective of the present invention is to provide a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks within a fault basin. This method considers the basin (or depression) as a whole in both space and time, thereby clarifying the differences in the sources and activity timing of fluids at different tectonic locations, ultimately revealing the spatiotemporal differential evolution of diagenetic fluids in clastic rocks within a fault lake basin.

[0006] Another object of the present invention is to provide a device for determining the spatiotemporal evolution of clastic diagenetic fluids in a fault basin. Another object of the present invention is to provide an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method for determining the spatiotemporal evolution of clastic diagenetic fluids in a fault basin are implemented. Another object of the present invention is to provide a readable medium storing the computer program, and when the processor executes the computer program, the steps of the method for determining the spatiotemporal evolution of clastic diagenetic fluids in a fault basin are implemented.

[0007] In order to solve the technical problems in the background technology of this application, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, comprising:

[0009] Obtaining authigenic minerals at different structural positions of the fault basin; wherein the authigenic minerals include carbonates, quartz overgrowth, and anhydrite;

[0010] determining the paleofluid temperature of the authigenic mineral based on the homogenization temperature of the brine inclusions and the homogenization temperature of the hydrocarbon inclusions of the authigenic mineral;

[0011] The spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin is determined according to the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0012] In some embodiments of the present invention, the step of obtaining authigenic minerals at different structural positions in the fault basin includes:

[0013] collecting rock samples from different structural positions in the fault basin;

[0014] Prepare common rock thin sections on each rock sample;

[0015] The authigenic minerals are obtained in thin slices of the common rock.

[0016] In some embodiments of the present invention, the step of obtaining the authigenic mineral in the ordinary rock slice includes:

[0017] Determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock thin section by polarizing microscopy and cathodoluminescence microscopy;

[0018] The authigenic minerals are obtained in the common rock slices according to the diagenetic sequence.

[0019] In some embodiments of the present invention, the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0020] Double-sided polished rock thin sections were prepared in each rock sample at the same location as the conventional rock thin sections.

[0021] In some embodiments of the present invention, the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0022] Obtaining the uniform temperature of the brine inclusions and the uniform temperature of the hydrocarbon inclusions of the authigenic mineral, comprising:

[0023] identifying the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slices by fluorescence microscopy;

[0024] A uniform temperature detection is performed on the brine inclusion and the hydrocarbon inclusion to obtain the uniform temperature of the brine inclusion and the uniform temperature of the hydrocarbon inclusion.

[0025] In some embodiments of the present invention, the step of determining the burial history of the fault basin includes:

[0026] The burial history of the fault basin is determined based on the geological background data of the fault basin, the top and bottom burial depths, stratum thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

[0027] In some embodiments of the present invention, the step of determining the paleo-geothermal gradient comprises:

[0028] Simulating the ancient temperature of the strata at different geological times in the fault basin according to the geothermal gradient of the fault basin;

[0029] The paleo-geothermal gradient is determined according to the paleo-temperature of the formation.

[0030] In a second aspect, the present invention provides a device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, the device comprising:

[0031] An authigenic mineral acquisition module is used to acquire authigenic minerals at different structural positions in the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargement and anhydrite;

[0032] a paleofluid temperature determination module, configured to determine the paleofluid temperature of the authigenic mineral based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic mineral;

[0033] The evolution process determination module is used to determine the spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin based on the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0034] In some embodiments of the present invention, the authigenic mineral acquisition module includes:

[0035] A rock sample collection unit, used for collecting rock samples from different structural positions in the fault basin;

[0036] A common thin section preparation unit, used to prepare common rock thin sections on each rock sample;

[0037] The authigenic mineral obtaining unit is used to obtain the authigenic mineral in the ordinary rock slice.

[0038] In some embodiments of the present invention, the authigenic mineral acquisition unit includes:

[0039] a diagenetic sequence determination unit, configured to determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock slice by using a polarizing microscope and a cathodoluminescence microscope;

[0040] The authigenic mineral acquisition subunit is used to acquire the authigenic mineral in the ordinary rock slice according to the diagenetic sequence.

[0041] In some embodiments of the present invention, the apparatus for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0042] A double-sided thin section preparation unit is used to prepare double-sided polished rock thin sections at the same position as the ordinary rock thin sections in each rock sample.

[0043] In some embodiments of the present invention, the apparatus for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0044] A uniform temperature acquisition module is used to obtain the uniform temperature of the brine inclusions of the authigenic mineral and the uniform temperature of the hydrocarbon inclusions. The uniform temperature acquisition module includes:

[0045] an inclusion identification unit, configured to identify the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slice using a fluorescence microscope;

[0046] The uniform temperature unit is used to perform uniform temperature detection on the brine inclusion and the hydrocarbon inclusion to obtain the uniform temperature of the brine inclusion and the uniform temperature of the hydrocarbon inclusion.

[0047] In some embodiments of the present invention, the evolution process determination module includes:

[0048] The burial history determination unit is used to determine the burial history of the fault basin based on the geological background data of the fault basin, the top and bottom burial depths of the stratigraphic units, stratigraphic thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

[0049] In some embodiments of the present invention, a device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin includes:

[0050] A paleo-geothermal gradient determination module is used to determine the paleo-geothermal gradient. The paleo-geothermal gradient determination module includes:

[0051] A paleotemperature simulation unit, configured to simulate paleotemperatures of strata at different geological times in the fault basin according to the geothermal gradient of the fault basin;

[0052] The paleo-geothermal gradient determining unit is used to determine the paleo-geothermal gradient according to the paleo-temperature of the formation.

[0053] In a third aspect, the present invention provides a computer program product comprising a computer program / instruction, which, when executed by a processor, implements the steps of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin.

[0054] In a fourth aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin are implemented.

[0055] In a fifth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin.

[0056] From the above description, it can be seen that an embodiment of the present invention provides a method and device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin. The corresponding method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin includes: first, obtaining authigenic minerals at different tectonic positions in the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargements and anhydrite; then, determining the paleofluid temperature of the authigenic minerals based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic minerals; finally, determining the spatiotemporal evolution process of the diagenetic fluids in the clastic rocks in the fault basin based on the paleofluid temperature and the predetermined burial history and paleogeothermal gradient of the fault basin.

[0057] The present invention determines the time range of diagenetic fluid activity in clastic reservoirs at different tectonic locations, thereby helping to establish differential fluid evolution patterns at different tectonic locations in fault lake basins, and ultimately providing technical support for predicting the genesis of high-quality clastic reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 any creative work.

[0059] Figure 1 Schematic diagram of a flow chart of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin according to an embodiment of the present invention;

[0060] Figure 2 1 is a flow chart of step 100 of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin in an embodiment of the present invention;

[0061] Figure 3 1 is a flow chart of step 103 of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin in an embodiment of the present invention;

[0062] Figure 4 1 is another flow chart of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin according to an embodiment of the present invention;

[0063] Figure 5 Schematic diagram of the flow of step 500 of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin in an embodiment of the present invention;

[0064] Figure 6 A schematic flow chart of a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin in a specific embodiment of the present invention;

[0065] Figure 7 A schematic diagram of the regional location of the Minfeng sag in the Bohai Bay Basin in a specific embodiment of the present invention (structural location and stratigraphic cross-section of the core wells Fengshen 2, Fengshen 1, and Yan 22);

[0066] Figure 8 Schematic diagram of the diagenetic evolution sequence of sand bodies in wells Fengshen 2, Fengshen 1 and Yan 22 of the fourth member of the Shahejie Formation in the northern Minfeng sag in a specific embodiment of the present invention;

[0067] Figure 9This is a histogram of the uniform temperature distribution of brine inclusions of authigenic minerals (quartz secondary oversize, anhydrite, and ankerite) in the reservoir of Well 22 of the fourth member of the Shahejie Formation in the northern Minfeng Depression in a specific embodiment of the present invention;

[0068] Figure 10 This is a histogram of the uniform temperature distribution of brine inclusions of authigenic minerals (quartz secondary oversize, anhydrite, and ankerite) in the reservoir of the Fengshen 1 well in the fourth member of the Shahejie Formation in the northern Minfeng sag in a specific embodiment of the present invention;

[0069] Figure 11 This is a histogram of the uniform temperature distribution of brine inclusions of authigenic minerals (quartz secondary oversize, anhydrite, and ankerite) in the reservoir of the Fengshen 2 well in the fourth member of the Shahejie Formation in the northern Minfeng sag in a specific embodiment of the present invention;

[0070] Figure 12 This is a single well burial history and formation paleotemperature map of Well Yan 22 in the northern Minfeng Sag in a specific embodiment of the present invention;

[0071] Figure 13 This is a single well burial history and formation paleotemperature map of Fengshen 1 Well in the northern Minfeng Sag in a specific embodiment of the present invention;

[0072] Figure 14 This is a single well burial history and formation paleotemperature map of Fengshen 2 Well in the northern Minfeng Sag in a specific embodiment of the present invention;

[0073] Figure 15 This is a diagram showing the spatiotemporal evolution of acidic and alkaline diagenetic fluids in the fourth member of the Shahejie Formation in the northern Minfeng Sag in a specific embodiment of the present invention;

[0074] Figure 16 is a block diagram of a device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin according to an embodiment of the present invention;

[0075] Figure 17 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0077] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0078] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices. The embodiments in this application and the features described in the embodiments may be combined with each other unless there is a conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0079] The acquisition, storage, use, and processing of data in the technical solution of this application comply with relevant laws and regulations.

[0080] Patent application number 201910538155.3, "Method and System for Identifying the Origin of Diagenetic Fluids Based on In-situ Elemental Distribution in Microregions," primarily involves preparing thin sections of rock samples, analyzing the cathodoluminescence characteristics of the filling veins in the thin sections to determine their origin; and establishing a fluid element distribution composition chart based on the cathodoluminescence-rare earth element distribution relationship to further identify the fluid's origin. A shortcoming of this invention is that it does not address the temperature and time ranges for the activity of fluids of different properties in clastic reservoirs.

[0081] Patent application number 202011085732.7, "A Method for Detailed Characterization of the Diagenetic Stage During the Diagenetic Process of Clastic Reservoirs," includes the following steps: S1. Collecting geological data from the study area; S2. Calculating formation temperature and burial history; S3. Calculating vitrinite reflectance; S4. Calculating the montmorillonite content in the illinium or montmorillonite mixed layer; S5. Determining the diagenetic stage. The patent's description of the preparation of single-well burial histories and the calculation of formation paleotemperatures provides a detailed supplement to a specific aspect of the present invention. Shortcomings: The patent lacks a method or description for determining the timing of fluid activity during diagenesis.

[0082] Patent application number 201610985115.X is titled "A method for determining the source of paleodiagenetic fluids in sandstone reservoirs". It mainly includes: determining the temperature and oxygen isotopes of the paleodiagenetic fluid that precipitated the quartz cement during the burial of the reservoir by detecting the homogenization temperature of brine inclusions in micron-level quartz oversize in sandstone reservoirs and in-situ micro-area detection of oxygen isotopes in quartz oversize, and judging the source of the paleodiagenetic fluid. The steps of the present invention also involve the detection of the homogenization temperature of brine inclusions in authigenic minerals, especially the detailed steps of the detection of the homogenization temperature of brine inclusions in secondary oversize of quartz, which are worth learning from. The shortcomings of this invention: It does not take into account the differences in the activity time of diagenetic fluids due to differences in tectonic activity, burial history, paleo-temperature of formations, etc. at different well locations.

[0083] In summary, existing technologies for studying diagenetic fluids typically only consider a specific region or single well analysis, without considering the basin (or depression) as a whole in terms of space and time. Therefore, when conducting diagenetic fluid research in faulted lake basins, it is necessary to not only study and control the diagenetic sequence at a macro level, but also analyze the diagenetic fluid characteristics of individual wells. This will clarify the differences in the sources and activity time of fluids at different structural locations, and reveal the temporal and spatial differences in the evolution of diagenetic fluids in the clastic rocks of faulted lake basins.

[0084] Example 1:

[0085] Based on the above reasons, the embodiment of the present invention provides a specific implementation method for determining the spatiotemporal evolution of clastic rock diagenetic fluid in a fault basin, see Figure 1 , specifically including the following contents:

[0086] Step 100: Obtaining authigenic minerals at different structural positions in the fault basin; wherein the authigenic minerals include carbonates, quartz overgrowth, and anhydrite;

[0087] Step 200: Determine the paleofluid temperature of the authigenic mineral based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic mineral;

[0088] Step 300: Determine the spatiotemporal evolution of the diagenetic fluid of the clastic rocks in the fault basin based on the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0089] From the above description, it can be seen that an embodiment of the present invention provides a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, including: first, obtaining authigenic minerals at different tectonic positions in the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargements and anhydrite; then, determining the paleofluid temperature of the authigenic minerals based on the homogenization temperature of the brine inclusions and the homogenization temperature of the hydrocarbon inclusions of the authigenic minerals; finally, determining the spatiotemporal evolution process of the diagenetic fluids in the clastic rocks in the fault basin based on the paleofluid temperature and the predetermined burial history and paleogeothermal gradient of the fault basin.

[0090] The present invention can help establish differential fluid evolution patterns at different structural positions in fault lake basins by determining the time range of diagenetic fluid activity in clastic reservoirs at different structural positions, and ultimately provide technical support for predicting the genesis of high-quality clastic reservoirs.

[0091] Example 2:

[0092] With respect to step 100, a rift basin is a lake basin formed by surface subsidence caused by faulting due to crustal movement. It usually occurs within the continental crust, especially in a tectonic environment of tension, such as in a continental rift zone. The following are some characteristics of rift basins: The formation mechanism of rift basins includes: Tension: Fault basins mainly occur in areas where the crust is subjected to tension, and the crust is stretched, causing the rock layers to fracture. Fault formation: Faulting causes the crust to form a series of parallel normal faults. Block subsidence: The block defined by the fault descends along the fault plane, forming a subsidence basin.

[0093] The structural characteristics of a rift basin include: Boundary faults: A rift basin typically has a distinct boundary fault, with relatively high ground on one side and a basin formed by subsidence on the other. Basin morphology: Basins can have a variety of shapes, including elongated, elliptical, or irregular. Sediment infill: As faults move, the basin's interior is continuously filled with sediment, which can be river silt, windblown dust, or biological sediments. Lake formation: When there is sufficient precipitation, lakes can form in a rift basin.

[0094] The significance of rift basins includes the following: First, the sedimentary layers within rift basins often preserve a wealth of paleoenvironmental and paleoclimatic information. Furthermore, the sediments within rift basins sometimes form rich reservoirs of oil and natural gas, which are of great economic value. Finally, the faults that border rift basins are often areas of frequent seismic activity.

[0095] In some embodiments of the present invention, see Figure 2 , step 100 includes:

[0096] Step 101: collecting rock samples from different structural positions in the fault basin;

[0097] Specifically, rock samples were collected from wells at different structural locations in the fault lake basin.

[0098] Step 102: preparing a common rock thin section on each rock sample;

[0099] A thin section of ordinary rock with a thickness of 35 μm was prepared on the sample. It is understood that this thickness allows light to pass through the rock, while being thin enough to observe the mineral grains and details in the rock.

[0100] Step 103: Obtain the authigenic minerals in the ordinary rock slice.

[0101] Specifically, a rock saw or other cutting tool is used to cut the rock sample into small pieces, preferably a few centimeters wide. The cut pieces are then embedded in a base material (such as epoxy resin) and ground flat on one side to make them smooth enough for subsequent thin sectioning. The smoothed pieces are then attached to a standard-sized glass slide using a special adhesive (such as epoxy resin). Finally, the thin section is meticulously polished to obtain a clear image under a microscope.

[0102] In some embodiments of the present invention, see Figure 3 , step 103 includes:

[0103] Step 1031: Determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock thin section using a polarizing microscope and a cathodoluminescence microscope;

[0104] The diagenetic sequence is a series of geological processes by which sediments are transformed from their initial depositional state into hard rock (lithification). Diagenesis is a series of physical, chemical, and biological processes that occur under relatively low temperature and pressure conditions, typically in the crustal layer shallow below the sedimentary cover. Diagenesis involves many steps, the order of which can be divided according to the depth of sediment burial and the subsequent increase in temperature and pressure conditions. Specifically, the processes of the diagenetic sequence in step 103 include:

[0105] As new sediment accumulates, older sediments become compacted, forcing out interstitial water and increasing the contact area between particles. Following mechanical compaction, particles may further bond together through dissolution, reducing interstitial spaces and increasing rock strength. As sediments are buried further, dissolved minerals in groundwater (such as quartz and calcite) can precipitate and fill the interstitial spaces between particles, binding them together into a solid rock. Under deeper burial conditions and higher temperatures, existing minerals may dissolve and reprecipitate, forming larger crystals. Certain minerals (such as clay minerals) may transform into more stable mineral forms, such as illite and chloride, due to changes in temperature and chemical conditions. With increasing burial depth, the chemical composition of pore water also changes, potentially affecting the chemical stability and mineralogy of sedimentary rocks. Under immense pressure, portions of the rock may dissolve and reprecipitate in areas with less pressure, a process known as pressure solution. Some hydrated minerals may lose bound water molecules, potentially accompanied by other chemical reactions. During burial, the rock may fracture, and these fractures and microcracks can be filled by new mineral precipitation, forming gangue.

[0106] It’s important to note that diagenetic sequences are not fixed; different sedimentary environments and subsequent geological histories lead to different diagenetic pathways. Diagenesis typically occurs within a few thousand meters below the Earth’s surface under relatively low-pressure and low-temperature conditions. Beyond certain temperature and pressure conditions, sedimentary rocks may enter the realm of metamorphism.

[0107] Step 1032: Obtain the authigenic minerals in the ordinary rock slice according to the diagenetic sequence.

[0108] Specifically, according to the diagenetic sequence, different types and stages of authigenic minerals (or cements) in rock thin sections are found and identified, such as carbonates, quartz secondary enlargement, anhydrite, etc.

[0109] In some embodiments of the present invention, see Figure 4 , a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, further comprising:

[0110] Step 400: Prepare a double-sided polished rock slice at the same position as the ordinary rock slice in each rock sample.

[0111] Combined with step 102, step 400 is to collect rock samples from wells at different structural locations in the fault lake basin, and prepare 35μm thick ordinary rock thin sections and multiple sets of 80-100μm thick double-sided polished rock thin sections at the same location of the samples.

[0112] In some embodiments of the present invention, a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0113] Obtain the homogenous temperature of the brine inclusions and the homogenous temperature of the hydrocarbon inclusions of the authigenic mineral, then, refer to Figure 5 , obtaining the uniform temperature of the brine inclusions and the uniform temperature of the hydrocarbon inclusions of the authigenic mineral, comprising:

[0114] Step 501: identifying the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slice using a fluorescence microscope;

[0115] Step 502: Performing uniform temperature detection on the brine inclusions and the hydrocarbon inclusions to obtain the uniform temperature of the brine inclusions and the uniform temperature of the hydrocarbon inclusions.

[0116] In steps 501 and 502, a fluorescence microscope is used to find and identify brine inclusions and hydrocarbon inclusions in authigenic minerals in double-sided polished rock slices, and a uniform temperature detection is performed on the brine inclusions in the selected minerals in combination with a matching microscope hot and cold stage.

[0117] In some embodiments of the present invention, the step of determining the burial history of the fault basin includes:

[0118] The burial history of the fault basin is determined based on the geological background data of the fault basin, the top and bottom burial depths, stratum thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

[0119] Specifically, geological background data and single well data for the study area were collected, mainly including stratigraphic layers, burial depth, thickness, and formation time. Based on the well locations of different tectonic units, as well as data such as the top and bottom burial depths, stratigraphic thickness, erosion thickness, and deposition and erosion formation time of the stratigraphic units of the individual wells, the burial history of the individual wells at different tectonic locations was compiled.

[0120] In some embodiments of the present invention, the step of determining the paleo-geothermal gradient comprises:

[0121] Simulating the ancient temperature of the strata at different geological times in the fault basin according to the geothermal gradient of the fault basin;

[0122] The paleo-geothermal gradient is determined according to the paleo-temperature of the formation.

[0123] From the above description, it can be seen that an embodiment of the present invention provides a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin. The method utilizes the burial history and paleotemperature distribution of formations in different areas of the fault lake basin, and is based on the diagenetic period of the clastic reservoirs in different wells and the homogenized temperature of the authigenic mineral brine inclusions, thereby determining the spatiotemporal differential evolution of diagenetic fluids in clastic rocks in the fault lake basin.

[0124] Example 3:

[0125] In a specific embodiment, the present invention also takes the Minfeng sag in the Bohai Bay Basin as an example to provide a specific embodiment of a method for determining the spatiotemporal evolution of clastic rock diagenetic fluid in a fault basin, see Figure 6 , specifically including the following steps.

[0126] Step S1: preparing rock thin sections.

[0127] See also Figure 7 , rock samples were collected from wells at different structural locations in the fault lake basin, and 35μm thick ordinary rock thin sections and multiple sets of 80-100μm thick double-sided polished rock thin sections were prepared at the same location of the samples;

[0128] Clastic rock core samples from the fourth member of the Shahejie Formation (Es4) of Fengshen 2, Fengshen 1 and Yan 22 wells at different tectonic locations in the northern steep slope zone of the fault basin were selected. Ordinary rock thin sections with a thickness of 35 μm and multiple sets of double-sided polished rock thin sections with a thickness of 80-100 μm were ground at the same location; the sampling depths were: 3239.3 m for the sample of Yan 22 well; 3819.5 m for the sample of Fengshen 1 well; and 5545.0 m for the sample of Fengshen 2 well.

[0129] Step S2: Searching for authigenic minerals.

[0130] Use polarizing microscope and cathodoluminescence microscope to determine the diagenetic sequence of clastic reservoirs in ordinary rock thin sections, and find and identify different types and stages of authigenic minerals (or cements) in rock thin sections based on the diagenetic sequence, such as carbonates, quartz overgrowth, anhydrite, etc.

[0131] See also Figure 8 With the help of ordinary optical microscope and cathodoluminescence microscope, the diagenetic sequence in the rock thin sections of Fengshen 2, Fengshen 1 and Yan 22 wells was identified according to the growth order and intersection relationship between the minerals. The diagenetic sequence of the clastic reservoir is as follows:

[0132] Well Fengshen 2: Compaction and calcite and gypsum cementation occurred in the early diagenetic stage. Calcite, gypsum, and feldspar dissolution occurred during the middle diagenetic stage, accompanied by quartz enlargement and clay mineral precipitation. Anhydrite and a small amount of ankerite cementation occurred in the late middle diagenetic stage.

[0133] Well Fengshen 1: Compaction and calcite and gypsum cementation occurred in the early diagenetic stage → calcite, gypsum, and feldspar dissolution occurred in the middle diagenetic stage, accompanied by quartz enlargement and clay mineral precipitation → ankerite and anhydrite cementation occurred in the late middle diagenetic stage;

[0134] Well Yan 22: Compaction and a small amount of calcite cementation occurred in the early diagenetic stage → calcite and feldspar dissolution occurred in the middle diagenetic stage, accompanied by quartz enlargement and clay mineral precipitation → a small amount of ankerite cementation;

[0135] Among them, quartz overgrowth cements primarily result from the dissolution of minerals such as feldspar, indicating an acidic fluid environment. Carbonate minerals dissolve in acidic environments, so ankerite represents an alkaline fluid environment. The formation of anhydrite is primarily related to the dehydration of early gypsum minerals, which renders the formation water alkaline. Testing the homogenization temperature of its brine inclusions can clarify the paleo-precipitation temperature and the timing of alkaline fluid activity. Therefore, the clastic reservoirs of the fourth member of the Shahejie Formation in wells Fengshen 2, Fengshen 1, and Yan 22 in the northern steep slope of the Minfeng sag primarily experienced a diagenetic fluid environment that progressed from alkaline to acidic to alkaline.

[0136] Step S3: Obtain the paleofluid temperature during the precipitation of authigenic minerals.

[0137] Fluorescence microscopy is used to search for and identify brine inclusions and hydrocarbon inclusions in authigenic minerals in double-sided polished rock thin sections. The brine inclusions in selected minerals are subjected to uniform temperature detection in combination with the accompanying microscope hot and cold stage, thereby obtaining the paleofluid temperature during the precipitation of carbonate, anhydrite and quartz cement respectively.

[0138] Find and identify authigenic minerals (quartz oversize, gypsum and ankerite) in rock thin sections, and use fluorescence microscopy to find and identify brine inclusions and hydrocarbon inclusions in authigenic minerals.

[0139] Step S4: Calculate the paleotemperature of the strata at different geological times in the study area.

[0140] Geological background data and individual well data for the study area were collected, primarily including stratigraphic layers, burial depth, thickness, and formation time. Burial histories of individual wells at different structural locations were compiled based on the well locations of different tectonic units, as well as data on top and bottom burial depths, stratigraphic thickness, denudation thickness, and the time of deposition and denudation. Furthermore, paleotemperatures of stratigraphic layers at different geological times were calculated based on geothermal gradient simulations.

[0141] First, the homogenization temperature of the brine inclusions in the selected quartz oversize and late ankerite and gypsum was measured using an optical microscope and its matching microscope hot and cold stage to obtain the paleodiagenetic fluid temperature when the quartz oversize, ankerite and gypsum were precipitated. Figures 9 to 11 ;

[0142] Well Yan 22: quartz secondary growth paleotemperature: 90-110℃ (4 samples), ankerite paleotemperature: 110-140℃ (4 samples);

[0143] Fengshen 1 well: quartz secondary enlargement paleotemperature: 110-130℃ (9 samples), ankerite paleotemperature: 145-151℃ (6 samples), anhydrite paleotemperature: 110-140℃ (6 samples);

[0144] Fengshen 2 Well: Paleotemperatures of quartz secondary growth: 130-138°C (3 samples) and 160-162°C (3 samples); paleotemperatures of ankerite: 150°C, 151°C, and 160-170°C (6 samples); paleotemperature of anhydrite: 121-158°C (26 samples);

[0145] Next, geological data such as strata, burial depth, thickness, and formation time were collected in the study area. The paleotemperature, burial depth, and burial history of Fengshen 2, Fengshen 1, and Yan 22 wells were calculated and produced by inputting relevant data on stratum top depth, stratum bottom depth, stratum thickness, erosion thickness, and deposition and erosion time.

[0146] Step S5: Determine the time and range of diagenetic fluid activity in a single well.

[0147] Combining the burial history and paleo-geothermal gradient of individual wells with the homogenization temperature of brine inclusions within their authigenic minerals, the timing and extent of diagenetic fluid activity in individual wells at different tectonic locations can be determined.

[0148] See also Figures 12 to 14 Based on the homogenization temperatures of the lowest brine inclusions in quartz overhangs and ankerite in the reservoirs of Fengshen 2, Fengshen 1, and Yan 22 wells, and combined with the burial history and paleotemperature of the formations in these wells, the onset and duration of acidic and alkaline fluid activity in the reservoirs at different well locations in the Minfeng sag were determined. The range of diagenetic fluid activity in the clastic reservoirs at different structural locations is as follows:

[0149] Well Fengshen 2: The lowest homogenization temperature of brine inclusions in the quartz overhang is 130°C. Combined with the burial history and formation paleotemperature, the transition from an alkaline to an acidic diagenetic environment is determined to be approximately 43 Ma. The homogenization temperature of low brine inclusions in ankerite cement is mainly distributed around 160°C, indicating that the transition from an acidic to an alkaline diagenetic environment occurred at approximately 13 Ma, and the duration of the acidic fluid is approximately 30 Ma (Note: Ma represents millions of years).

[0150] Well Fengshen 1: The lowest homogenization temperature of brine inclusions in the quartz overhang is 110°C. Combined with the burial history and formation paleotemperature, the transition from alkaline to acidic diagenetic environment is determined to be approximately 41 Ma. The lowest homogenization temperature of brine inclusions in ankerite cement is 145°C, indicating a transition from acidic to alkaline diagenetic environment of approximately 6 Ma, and the duration of the acidic fluid is approximately 35 Ma.

[0151] Well Yan-22: The lowest homogenization temperature of brine inclusions in the quartz overhang is 90°C. Combined with the burial history and paleotemperature of the formation, the transition from an alkaline to an acidic diagenetic environment is determined to be approximately 36 Ma. The lowest homogenization temperature of brine inclusions in the ankerite cement is 110°C, indicating a transition from an acidic to an alkaline diagenetic environment of approximately 4 Ma, and the duration of the acidic fluid is approximately 32 Ma.

[0152] Step S6: Establishing a spatiotemporal differential evolution model of diagenetic fluids in clastic rocks in a fault basin.

[0153] Based on the diagenetic fluid activity time of single wells at different structural locations and the stratigraphic profile of the fault basin, the evolution history of diagenetic fluids with different properties is clarified, and ultimately a temporal and spatial differential evolution model of diagenetic fluids in clastic rocks in the fault lake basin is established.

[0154] See also Figure 15 Based on the time and range of diagenetic fluid activity in Fengshen 2, Fengshen 1 and Yan 22 wells, as well as the stratigraphic profile of the northern steep slope zone of the Minfeng sag, a method for the temporal and spatial differential evolution of diagenetic fluids in clastic rocks in faulted lake basins was established.

[0155] Specific embodiments of the present invention provide a method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in faulted basins. This method, by detecting the homogenization temperature of brine inclusions within authigenic minerals in clastic reservoirs and restoring the burial history and paleotemperature of individual wells at different tectonic locations, determines the timing and range of diagenetic fluid activity in individual wells. This method also identifies differences in the timing of diagenetic fluid activity among wells at different tectonic locations, addressing the issue of differential spatiotemporal evolution of diagenetic fluids during burial in clastic reservoirs in faulted lake basins.

[0156] Example 4:

[0157] Based on the same inventive concept, the embodiments of the present application also provide a device for determining the spatiotemporal evolution of clastic rock diagenetic fluids in a fault basin, which can be used to implement the methods described in the above embodiments, such as the following embodiments. Since the principle of solving the problem by the device for determining the spatiotemporal evolution of clastic rock diagenetic fluids in a fault basin is similar to the method for determining the spatiotemporal evolution of clastic rock diagenetic fluids in a fault basin, the implementation of the device for determining the spatiotemporal evolution of clastic rock diagenetic fluids in a fault basin can refer to the implementation of the method for determining the spatiotemporal evolution of clastic rock diagenetic fluids in a fault basin, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and conceived.

[0158] The embodiment of the present invention provides a specific embodiment of a device for determining the spatiotemporal evolution of clastic rock diagenetic fluid in a fault basin, which can realize a method for determining the spatiotemporal evolution of clastic rock diagenetic fluid in a fault basin. Figure 16 A device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks of a fault basin comprises:

[0159] The authigenic mineral acquisition module 10 is used to acquire authigenic minerals at different structural positions of the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargement and anhydrite;

[0160] a paleo-fluid temperature determination module 20 for determining the paleo-fluid temperature of the authigenic mineral based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic mineral;

[0161] The evolution process determination module 30 is used to determine the spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin according to the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0162] In some embodiments of the present invention, the authigenic mineral acquisition module includes:

[0163] A rock sample collection unit, used for collecting rock samples from different structural positions in the fault basin;

[0164] A common thin section preparation unit, used to prepare common rock thin sections on each rock sample;

[0165] The authigenic mineral obtaining unit is used to obtain the authigenic mineral in the ordinary rock slice.

[0166] In some embodiments of the present invention, the authigenic mineral acquisition unit includes:

[0167] a diagenetic sequence determination unit, configured to determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock slice by using a polarizing microscope and a cathodoluminescence microscope;

[0168] The authigenic mineral acquisition subunit is used to acquire the authigenic mineral in the ordinary rock slice according to the diagenetic sequence.

[0169] In some embodiments of the present invention, the apparatus for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0170] A double-sided thin section preparation unit is used to prepare double-sided polished rock thin sections at the same position as the ordinary rock thin sections in each rock sample.

[0171] In some embodiments of the present invention, the apparatus for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0172] A uniform temperature acquisition module is used to obtain the uniform temperature of the brine inclusions of the authigenic mineral and the uniform temperature of the hydrocarbon inclusions. The uniform temperature acquisition module includes:

[0173] an inclusion identification unit, configured to identify the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slice using a fluorescence microscope;

[0174] The uniform temperature unit is used to perform uniform temperature detection on the brine inclusion and the hydrocarbon inclusion to obtain the uniform temperature of the brine inclusion and the uniform temperature of the hydrocarbon inclusion.

[0175] In some embodiments of the present invention, the evolution process determination module includes:

[0176] The burial history determination unit is used to determine the burial history of the fault basin based on the geological background data of the fault basin, the top and bottom burial depths of the stratigraphic units, stratigraphic thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

[0177] In some embodiments of the present invention, a device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin includes:

[0178] A paleo-geothermal gradient determination module is used to determine the paleo-geothermal gradient. The paleo-geothermal gradient determination module includes:

[0179] A paleotemperature simulation unit, configured to simulate paleotemperatures of strata at different geological times in the fault basin according to the geothermal gradient of the fault basin;

[0180] The paleo-geothermal gradient determining unit is used to determine the paleo-geothermal gradient according to the paleo-temperature of the formation.

[0181] From the above description, it can be seen that an embodiment of the present invention provides a device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, including: an authigenic mineral acquisition module, used to obtain authigenic minerals in different tectonic positions of the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargement and anhydrite; a paleofluid temperature determination module, used to determine the paleofluid temperature of the authigenic minerals based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic minerals; an evolution process determination module, used to determine the spatiotemporal evolution process of the clastic rock diagenetic fluids in the fault basin based on the paleofluid temperature and the predetermined burial history and paleogeothermal gradient of the fault basin.

[0182] The present invention can help establish differential fluid evolution patterns at different structural positions in fault lake basins by determining the time range of diagenetic fluid activity in clastic reservoirs at different structural positions, and ultimately provide technical support for predicting the genesis of high-quality clastic reservoirs.

[0183] Embodiment 5:

[0184] The embodiment of the present application also provides a specific implementation of an electronic device capable of implementing all steps of the method for determining the spatiotemporal evolution of diagenetic fluid in clastic rocks in a fault basin in the above embodiment, see Figure 17 , electronic equipment specifically includes the following:

[0185] Processor 1201, memory 1202, communications interface 1203, and bus 1204;

[0186] The processor 1201, the memory 1202, and the communication interface 1203 communicate with each other via the bus 1204; the communication interface 1203 is used to implement information transmission between the server device and the client device and other related devices;

[0187] The processor 1201 is used to call the computer program in the memory 1202. When the processor executes the computer program, all steps of the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0188] Obtaining authigenic minerals at different structural positions of the fault basin; wherein the authigenic minerals include carbonates, quartz overgrowth, and anhydrite;

[0189] determining the paleofluid temperature of the authigenic mineral based on the homogenization temperature of the brine inclusions and the homogenization temperature of the hydrocarbon inclusions of the authigenic mineral;

[0190] The spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin is determined according to the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0191] In some embodiments of the present invention, the step of obtaining authigenic minerals at different structural positions in the fault basin includes:

[0192] collecting rock samples from different structural positions in the fault basin;

[0193] Prepare common rock thin sections on each rock sample;

[0194] The authigenic minerals are obtained in thin slices of the common rock.

[0195] In some embodiments of the present invention, the step of obtaining the authigenic mineral in the ordinary rock slice includes:

[0196] Determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock thin section by polarizing microscopy and cathodoluminescence microscopy;

[0197] The authigenic minerals are obtained in the common rock thin sections according to the diagenetic sequence.

[0198] In some embodiments of the present invention, the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0199] Double-sided polished rock thin sections were prepared in each rock sample at the same location as the conventional rock thin sections.

[0200] In some embodiments of the present invention, the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin further includes:

[0201] Obtaining the uniform temperature of the brine inclusions and the uniform temperature of the hydrocarbon inclusions of the authigenic mineral, comprising:

[0202] identifying the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slices by fluorescence microscopy;

[0203] A uniform temperature detection is performed on the brine inclusion and the hydrocarbon inclusion to obtain the uniform temperature of the brine inclusion and the uniform temperature of the hydrocarbon inclusion.

[0204] In some embodiments of the present invention, the step of determining the burial history of the fault basin includes:

[0205] The burial history of the fault basin is determined based on the geological background data of the fault basin, the top and bottom burial depths, stratum thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

[0206] In some embodiments of the present invention, the step of determining the paleo-geothermal gradient comprises:

[0207] Simulating the ancient temperature of the strata at different geological times in the fault basin according to the geothermal gradient of the fault basin;

[0208] The paleo-geothermal gradient is determined according to the paleo-temperature of the formation.

[0209] Example 6:

[0210] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps of the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin in the above-mentioned embodiments. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the computer program implements all steps of the method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin in the above-mentioned embodiments. For example, when the processor executes the computer program, the following steps are implemented:

[0211] Obtaining authigenic minerals at different structural positions of the fault basin; wherein the authigenic minerals include carbonates, quartz overgrowth, and anhydrite;

[0212] determining the paleofluid temperature of the authigenic mineral based on the homogenization temperature of the brine inclusions and the homogenization temperature of the hydrocarbon inclusions of the authigenic mineral;

[0213] The spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin is determined according to the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

[0214] The various embodiments in this specification are described in a progressive manner. Similar portions between the various embodiments can be referenced to each other. Each embodiment focuses on the differences between the other embodiments. In particular, the hardware + program embodiments are generally similar to the method embodiments, so their description is relatively simple. For relevant portions, refer to the description of the method embodiments.

[0215] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0216] Although the present application provides method operation steps such as embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative work. The order of steps listed in the embodiments is only one way of executing the steps among many steps and does not represent the only execution order. When an actual device or client product is executed, it can be executed in the order shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0217] For the convenience of description, the above devices are described in terms of functions divided into various modules. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same or multiple software and / or hardware, or the modules that implement the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0218] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0219] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0220] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0221] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced across them. Each embodiment focuses on the differences from the other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, their description is relatively simple. For relevant parts, reference can be made to the description of the method embodiments. Throughout this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the embodiments in this specification. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples, and features of different embodiments or examples, described in this specification, without conflict.

[0222] The above description is merely an example of the embodiments of this specification and is not intended to limit the embodiments of this specification. For those skilled in the art, various modifications and variations of the embodiments of this specification are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of this specification shall be included within the scope of the claims of the embodiments of this specification.

Claims

1. A method for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, characterized by: include: Obtaining authigenic minerals at different structural positions of the fault basin; wherein the authigenic minerals include carbonates, quartz overgrowth, and anhydrite; determining the paleofluid temperature of the authigenic mineral based on the homogenization temperature of the brine inclusions and the homogenization temperature of the hydrocarbon inclusions of the authigenic mineral; The spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin is determined according to the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

2. The determination method according to claim 1, characterized in that The steps of obtaining authigenic minerals at different structural positions of the fault basin include: collecting rock samples from different structural positions in the fault basin; Prepare common rock thin sections on each rock sample; The authigenic minerals are obtained in thin slices of the common rock.

3. The determination method according to claim 2, characterized in that: The steps of obtaining the authigenic mineral in the ordinary rock slice include: Determine the diagenetic sequence of the clastic rock reservoir in the ordinary rock thin section by polarizing microscopy and cathodoluminescence microscopy; The authigenic minerals are obtained in the common rock thin sections according to the diagenetic sequence.

4. The determination method according to claim 2, characterized in that: Also includes: Double-sided polished rock thin sections were prepared in each rock sample at the same location as the conventional rock thin sections.

5. The determination method according to claim 4, characterized in that: Also includes: Obtaining the uniform temperature of the brine inclusions and the uniform temperature of the hydrocarbon inclusions of the authigenic mineral, comprising: identifying the brine inclusions and the hydrocarbon inclusions on the double-sided polished rock slices by fluorescence microscopy; A uniform temperature detection is performed on the brine inclusion and the hydrocarbon inclusion to obtain the uniform temperature of the brine inclusion and the uniform temperature of the hydrocarbon inclusion.

6. The determination method according to any one of claims 1 to 5, characterized in that: The steps of determining the burial history of the fault basin include: The burial history of the fault basin is determined based on the geological background data of the fault basin, the top and bottom burial depths, stratum thickness, erosion thickness, and deposition and erosion formation time of single wells at different structural positions in the fault basin.

7. The determination method according to claim 1, characterized in that: The steps of determining the paleo-geothermal gradient include: Simulating the ancient temperature of the strata at different geological times in the fault basin according to the geothermal gradient of the fault basin; The paleo-geothermal gradient is determined according to the paleo-temperature of the formation.

8. A device for determining the spatiotemporal evolution of diagenetic fluids in clastic rocks in a fault basin, characterized in that: include: An authigenic mineral acquisition module is used to acquire authigenic minerals at different structural positions in the fault basin; wherein the authigenic minerals include carbonates, quartz secondary enlargement and anhydrite; a paleo-fluid temperature determination module, configured to determine the paleo-fluid temperature of the authigenic mineral based on the homogenized temperature of the brine inclusions and the homogenized temperature of the hydrocarbon inclusions of the authigenic mineral; The evolution process determination module is used to determine the spatiotemporal evolution process of the diagenetic fluid of the clastic rock in the fault basin based on the paleo-fluid temperature and the predetermined burial history and paleo-geothermal gradient of the fault basin.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for determining the spatiotemporal evolution of diagenetic fluid in clastic rocks in a fault basin according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the spatiotemporal evolution of diagenetic fluid in clastic rocks in a fault basin as described in any one of claims 1 to 7 are implemented.

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