Carbonate rock sedimentary facies-based oil and gas reservoir forming evaluation method and device

Abstract

The invention relates to the technical field of oil and gas field geology, in particular to an oil and gas reservoir forming evaluation method and device based on carbonatite sedimentary facies, and the method comprises the steps: determining the number of oil and gas reservoirs controlled by different types of sedimentary facies in a research work area and the oil and gas reserves of the oil and gas reservoirs; generating a reservoir control index of the sedimentary facies of the current type according to the quantity of oil and gas reservoirs controlled by the sedimentary facies of the current type, the oil and gas reserves of the oil and gas reservoirs controlled by the sedimentary facies of the current type, the total quantity of oil and gas reservoirs in the research work area and the total oil and gas reserves; and according to the reservoir control index of the sedimentary facies of the current type, depicting the oil and gas reservoir forming probability distribution characteristics of the sedimentary facies of the current type so as to evaluate the oil and gas reservoir forming effect corresponding to the sedimentary facies of the current type. According to the method, the digital model between the reservoir forming probability and the sedimentary facies type is established by determining the number of carbonate oil and gas reservoirs and geological reserve related information and digitizing the key parameters, and then the sedimentary facies oil and gas control effect is quantitatively represented.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas field geology, and in particular to a method, apparatus, equipment, storage medium and computer program for evaluating oil and gas accumulation based on carbonate sedimentary facies. Background Technology

[0002] Sedimentary facies refers to the comprehensive characteristics of a sedimentary environment and the sediments or sedimentary rocks formed within that environment. It is understood that oil and gas generally preferentially accumulate in reservoirs with favorable physical properties, and these reservoirs typically develop within favorable sedimentary facies. Therefore, whether in carbonate or clastic rocks, sedimentary facies control the formation and distribution of oil and gas reservoirs. Among these, carbonate rocks are more significantly controlled by sedimentary facies.

[0003] Currently, many scholars in the industry have conducted extensive research on sedimentary facies-controlled hydrocarbon generation, achieving considerable understanding and results (Zou et al., 2005; Zhao et al., 2005; Zhang et al., 2005; Pang et al., 2019; Tan et al., 2020; Zhang et al., 2022). However, most current research in this area is primarily qualitative, focusing on concepts such as "facies control theory," "sedimentary facies controlling sand body distribution and oil reservoir properties" (Zou et al., 2005; Zhang et al., 2005; Tan et al., 2020), and "using the superposition of sedimentary facies and oil-water production to reflect oil control laws" (Zhao et al., 2005). It is difficult to quantitatively characterize sedimentary facies-controlled hydrocarbon generation, which presents certain limitations in practical applications. Meanwhile, some scholars have also conducted quantitative evaluations of sedimentary facies-controlled hydrocarbon generation, including using the percentage of hydrocarbon reservoirs and the number of hydrocarbon reservoirs combined with geological reserves to quantitatively characterize facies-controlled hydrocarbon generation (Pang Xiongqi et al., 2019; Zhang Jinliang et al., 2022). However, these methods primarily study clastic hydrocarbon reservoirs, and the average allocation of the weights of hydrocarbon reservoir quantity and geological reserves to their controlling effects differs significantly from actual geological conditions. Especially in areas with complex carbonate sedimentary facies types and unclear hydrocarbon reservoir control mechanisms, the aforementioned theories, methods, and techniques still have certain limitations. Summary of the Invention

[0004] This disclosure provides a method, apparatus, equipment, storage medium, and computer program for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, in order to discover the number and geological reserves of carbonate hydrocarbon reservoirs in the study area, digitize key parameters, and establish a digital model between accumulation probability and sedimentary facies type through geostatistical methods, thereby quantitatively characterizing the hydrocarbon accumulation controlled by sedimentary facies.

[0005] Firstly, this disclosure provides a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, including:

[0006] Determine the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area, as well as the oil and gas reserves of those reservoirs.

[0007] The reservoir control index of the current sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0008] The hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies are characterized by the hydrocarbon accumulation control index, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0009] In some embodiments, determining the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area and the oil and gas reserves of the reservoirs includes:

[0010] The distribution characteristics of different types of sedimentary facies within the study area are obtained; wherein, the distribution characteristics include: planar distribution characteristics and depth distribution characteristics;

[0011] The number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs are determined based on the distribution characteristics.

[0012] In some embodiments, a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies further includes:

[0013] Calculate a first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0014] Calculate a second ratio of the oil and gas reserves controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0015] In some embodiments, a reservoir-controlling index for the current type of sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves, including:

[0016] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio and the second ratio.

[0017] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves further includes:

[0018] The first weight of the first ratio is determined based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area.

[0019] The second weight of the second ratio is determined based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area.

[0020] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio, the first weight, the second ratio, and the second weight.

[0021] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the first ratio and the second ratio includes:

[0022] A joint indicator index for the current type of sedimentary facies is generated based on the first ratio and the second ratio;

[0023] Calculate the joint indicator index for all types of sedimentary facies to determine the largest joint indicator index;

[0024] The reservoir-controlling index of the current type of sedimentary facies is generated based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0025] Secondly, this disclosure provides a hydrocarbon accumulation evaluation device based on carbonate sedimentary facies, comprising:

[0026] The oil and gas reservoir identification module is used to determine the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area, as well as the oil and gas reserves of the reservoirs.

[0027] The reservoir control index generation module is used to generate the reservoir control index of the current sedimentary facies based on the number of oil and gas reservoirs controlled by the current sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0028] The distribution feature characterization module is used to characterize the hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies based on the hydrocarbon accumulation control index, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0029] In some embodiments, the reservoir identification module includes:

[0030] The distribution feature acquisition unit is used to acquire the distribution features corresponding to different types of sedimentary facies within the study area; wherein, the distribution features include: planar distribution features and depth distribution features;

[0031] An oil and gas reservoir determination unit is used to determine the number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs based on the distribution characteristics.

[0032] In some embodiments, a hydrocarbon accumulation evaluation device based on carbonate sedimentary facies further includes:

[0033] The first ratio calculation module is used to calculate the first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0034] The second ratio calculation module is used to calculate the second ratio of the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0035] In some embodiments, the controlled storage index generation module includes:

[0036] The first unit for generating the reservoir control index is used to generate the reservoir control index of the current type of sedimentary facies based on the first ratio and the second ratio.

[0037] In some embodiments, the controlled storage index generation module further includes:

[0038] The first weight calculation unit is used to determine the first weight of the first ratio based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area.

[0039] The second weight calculation unit is used to determine the second weight of the second ratio based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area.

[0040] The second unit for generating the reservoir control index is used to generate the reservoir control index of the current type of sedimentary facies based on the first ratio, the first weight, the second ratio, and the second weight.

[0041] In some embodiments, the first unit for generating the controlled storage index includes:

[0042] A joint indicator index generation unit is used to generate a joint indicator index of the current type of sedimentary phase based on the first ratio and the second ratio;

[0043] The maximum index determination unit is used to calculate the joint indicator index for all types of sedimentary facies in order to determine the maximum joint indicator index;

[0044] The sedimentary control index generation subunit is used to generate a sedimentary control index for the current type of sedimentary facies based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0045] Thirdly, this disclosure provides a computer device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the foregoing aspects.

[0046] Fourthly, this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the methods described in the above aspects.

[0047] Fifthly, this disclosure provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the methods described in the foregoing aspects.

[0048] This disclosure provides a method, apparatus, equipment, storage medium, and computer program for evaluating hydrocarbon accumulation based on carbonate sedimentary facies. First, it determines the number of hydrocarbon reservoirs controlled by different types of sedimentary facies within the study area, as well as the hydrocarbon reserves of those reservoirs. Then, based on the number of hydrocarbon reservoirs controlled by the current sedimentary facies type, the hydrocarbon reserves controlled by the current sedimentary facies type, the total number of hydrocarbon reservoirs in the study area, and the total hydrocarbon reserves, it generates a reservoir-controlling index for the current sedimentary facies type. This digitizes key parameters based on the number of discovered hydrocarbon reservoirs and geological reserves within different sedimentary facies types. Finally, through geostatistical methods, it establishes a digital model between the probability of hydrocarbon accumulation and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effect of sedimentary facies. Attached Figure Description

[0049] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0050] Figure 1 This is a schematic flowchart of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, provided in an embodiment of this disclosure.

[0051] Figure 2 This is a flowchart illustrating step 100 of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, provided in an embodiment of this disclosure.

[0052] Figure 3 This is another schematic flowchart illustrating a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, provided in an embodiment of this disclosure.

[0053] Figure 4 This is a schematic flowchart of step 200 of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies provided in this embodiment of the present disclosure.

[0054] Figure 5 This is another schematic diagram of step 200 of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies provided in this disclosure.

[0055] Figure 6 This is a flowchart illustrating step 201 of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies provided in an embodiment of this disclosure.

[0056] Figure 7 This is a schematic flowchart illustrating a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, which is provided as an application example of this disclosure.

[0057] Figure 8 This is a schematic diagram of the sedimentary facies type and oil and gas reservoir distribution of a target layer in a basin study area, provided as an application example of this disclosure.

[0058] Figure 9 Histogram showing the relationship between sedimentary facies type and number of oil and gas reservoirs in a target layer of a basin study area, provided as an application example in this public disclosure.

[0059] Figure 10 This is a schematic diagram of the probability distribution of sedimentary facies-controlled reservoirs in a target stratigraphic study area, provided as an application example of this disclosure.

[0060] Figure 11 This is a block diagram of a hydrocarbon accumulation evaluation device based on carbonate sedimentary facies provided in an embodiment of this disclosure.

[0061] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0062] To enable those skilled in the art to better understand the technical solutions of this disclosure, and to fully understand and implement the process of how this disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. The embodiments of this disclosure and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort should fall within the protection scope of this disclosure.

[0063] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0064] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0065] Sedimentation plays a crucial role in the accumulation and formation of hydrocarbon reservoirs, and in some cases, even a pivotal one. Although numerous scholars have conducted related research and developed various evaluation methods, existing research results are largely qualitative and theoretical, making it difficult to quantitatively characterize sedimentary facies-controlled hydrocarbon generation, thus limiting their practical application. The limited quantitative studies that exist primarily focus on clastic reservoirs and also have limitations, showing significant discrepancies with actual geological conditions.

[0066] Example 1

[0067] For the reasons mentioned above, this disclosure provides a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies. Figure 1 This is a schematic flowchart illustrating a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies, provided in an embodiment of this disclosure. Figure 1 As shown, a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies includes:

[0068] Step 100: Determine the number of oil and gas reservoirs controlled by different types of sedimentary facies in the study area and the oil and gas reserves of the reservoirs;

[0069] Step 200: Generate the reservoir control index of the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0070] Step 300: Characterize the hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies based on the hydrocarbon accumulation control index, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0071] This disclosure provides a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies. First, it determines the number of hydrocarbon reservoirs controlled by different types of sedimentary facies within the study area, as well as the hydrocarbon reserves of those reservoirs. Then, it generates a reservoir-controlling index for the current sedimentary facies type based on the number of hydrocarbon reservoirs controlled by that type, the hydrocarbon reserves controlled by that type of sedimentary facies, the total number of hydrocarbon reservoirs in the study area, and the total hydrocarbon reserves. This digitizes key parameters based on the number of discovered hydrocarbon reservoirs and geological reserves within different sedimentary facies types. Finally, using geostatistical methods, it establishes a digital model between the probability of hydrocarbon accumulation and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effect of sedimentary facies.

[0072] In summary, this disclosure provides a method for digitizing key parameters based on the number of discovered oil and gas reservoirs and geological reserves within different sedimentary facies types. This establishes a digital model relating reservoir formation probability and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effect of sedimentary facies. This method is particularly suitable for areas with some oil and gas discoveries and production capacity, relatively complex sedimentary facies types, and unclear reservoir-controlling effects. It can provide effective guidance for subsequent hydrocarbon potential assessment, identification of favorable exploration areas, and enhance geological understanding.

[0073] Regarding step 100, sedimentary facies refer to the characteristics used to describe sediments or sedimentary rocks formed in a specific sedimentary environment. Different sedimentary environments will have different sedimentary facies, and these characteristics can include sediment composition, grain size, sedimentary structure, chemical composition, and biota. The study of sedimentary facies is of great significance for understanding paleoenvironments, paleoclimates, paleogeography, and oil and gas exploration. Specifically, sedimentary facies include the following types:

[0074] Fluvial facies: mainly composed of river sediments, characterized by gravel, cross-bedding, and channel filling structures.

[0075] Lacustrine facies: mainly composed of lacustrine sediments, characterized by fine-grained sediments (such as mudstone and siltstone), bedding, laminarization, etc.

[0076] Deltaic facies: Composed of sediments formed when rivers enter lakes or oceans, characterized by cross-bedding, distributary channel filling, peat layers, etc.

[0077] Littoral facies: Composed of coastal sediments, characterized by sandstone, mudstone, ripple marks, cross-bedding, etc.

[0078] Shallow marine facies: mainly composed of sediments from shallow marine environments, characterized by limestone, mudstone, sandstone, bioclastics, etc.

[0079] Deep marine facies: mainly composed of sediments from deep-sea environments, characterized by deep-sea mud, turbidites, siliceous rocks, etc.

[0080] Eolian facies: Composed of sediments formed by wind action, characterized by dune sand, cross-bedding, and aeolian sedimentary structures.

[0081] The formation of each sedimentary facies is closely related to specific sedimentary environments and geological processes. By studying sedimentary facies, we can reconstruct ancient sedimentary environments, predict the distribution of underground oil and gas resources, and better understand the historical evolution of oil and gas resources and underground geological structures.

[0082] As described above, the method provided in this disclosure is applied to carbonate sedimentary rocks. The sedimentary facies of carbonate rocks refers to the type and characteristics of the environment in which they were deposited. Sedimentary facies can be distinguished according to different sedimentary environments, including oceans, lakes, rivers, bays, and coastal areas. Different sedimentary facies lead to different characteristics of carbonate rocks, such as lithology, grain composition, sedimentary structure, and geochemical characteristics. Preferably, in this disclosure, the carbonate sedimentary facies includes:

[0083] Shallow marine facies: These sedimentary facies occur in nearshore waters and are influenced by tides, waves, and currents. Shallow marine carbonate rocks are characterized by coral reefs, shallow-sea carbonate platforms, turbidites, and beach rocks.

[0084] Deep marine facies: Carbonate sedimentary facies occurring in deep-sea environments, either on the seabed or in deep-sea basins, are influenced by suspended sediment deposition and water depth. These rocks include high-purity marl, calcareous dolomite, and deep-sea carbonate rocks.

[0085] Evaporitic Facies: Carbonate sedimentary facies formed in salt lake environments, mainly composed of salt sediments and carbonate rocks, such as gypsum, calcite, and rock salt.

[0086] Freshwater Lacustrine Facies: These sedimentary facies occur in freshwater lakes or the inlet areas of lakes and consist of limestone mudstone, limestone sandstone, and clastic rocks.

[0087] Littoral facies: Littoral facies refers to sedimentary environments that occur near the coastline, consisting of carbonate rocks deposited in the intertidal zone and shallow mudflats.

[0088] Understanding carbonate sedimentation is crucial for oil and gas exploration, reserve assessment, and reservoir development. Different sedimentary facies of carbonate rocks vary in porosity, pore structure, and permeability, characteristics that directly impact reservoir quality and reservoir density.

[0089] For step 200, the reservoir control index is used to characterize the control effect of the current type of sediment on the number of oil and gas reservoirs in the study area and the corresponding oil and gas reserves.

[0090] Furthermore, preferably, the oil and gas reserves in step 200 are geological reserves, which are the total amount of crude oil or natural gas in reservoirs with oil and gas production capacity under original geological conditions. Geological reserves are classified into on-balance-sheet reserves and off-balance-sheet reserves according to their exploitation value. On-balance-sheet reserves refer to geological reserves that have exploitation value and can generate socio-economic benefits under current technical and economic conditions. Off-balance-sheet reserves refer to geological reserves that cannot generate socio-economic benefits under current technical and economic conditions. It is understood that when crude oil and natural gas prices increase or process technologies improve, some off-balance-sheet reserves can be converted into on-balance-sheet reserves.

[0091] Regarding step 300, the probability distribution characteristics of hydrocarbon accumulation refer to the distribution characteristics describing the likelihood of oil and natural gas forming and accumulating in geological strata. In geological exploration, understanding these probability distribution characteristics is crucial for assessing the potential quantity and distribution of oil and natural gas resources. The probability distribution characteristics of hydrocarbon accumulation include:

[0092] Accumulation Models: Different geological structures, lithologies, and structural features influence hydrocarbon accumulation models. For example, different accumulation models such as structural traps, fault zones, and porous reservoirs correspond to different probability distribution characteristics.

[0093] Exploration success rate: The exploration success rate of an exploration area reflects the probability of oil and gas accumulation in that area. Exploration success rates will exhibit different distribution characteristics under different geological conditions.

[0094] Reserve distribution: The reserve distribution characteristics of discovered oil and gas fields can further help us understand the patterns and probability distribution characteristics of oil and gas accumulation.

[0095] Geological parameters: Geological parameters such as porosity, permeability, and lithology also affect the distribution of hydrocarbon accumulation probability. Changes in different parameters will lead to changes in the distribution of hydrocarbon accumulation probability.

[0096] Geophysical exploration data: Geophysical exploration data can provide information on subsurface structures and lithology, which helps in the analysis and prediction of the probability distribution of hydrocarbon accumulation.

[0097] In summary, considering the above factors, the distribution characteristics of hydrocarbon accumulation probability are of great significance for guiding exploration work and assessing oil and gas resource quantities. Research and analysis of these probability distribution characteristics can better guide oil and gas exploration and development, improving exploration success rates and resource utilization efficiency.

[0098] Example 2

[0099] Based on the above embodiments, see Figure 2 Step 100 of a hydrocarbon accumulation evaluation method based on carbonate sedimentary facies includes:

[0100] Step 101: Obtain the distribution characteristics of different types of sedimentary facies within the study area; wherein, the distribution characteristics include: planar distribution characteristics and depth distribution characteristics;

[0101] For planar distribution characteristics, stratigraphic maps can be created to show the spatial distribution of different sedimentary facies on a plane. For depth distribution characteristics, the superposition relationships between different strata can be analyzed to reveal the depositional sequence and spatial distribution of different sedimentary facies. Furthermore, analyzing the superposition relationships between different strata reveals the depositional sequence and spatial distribution of different sedimentary facies. Geophysical data, such as seismic data, can be used to study the distribution of different sedimentary facies at different depths. Through seismic inversion and seismic attribute analysis, the characteristics of different types of sedimentary facies at different depths, such as reflection boundaries and velocity differences, can be revealed.

[0102] Step 102: Determine the number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs based on the distribution characteristics.

[0103] In some embodiments, see Figure 3 Another method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies includes:

[0104] Step 400: Calculate a first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0105] Specifically, according to formula (1), the percentage of oil and gas reservoirs within the distribution range of different sedimentary facies is calculated:

[0106] P ni =N i / Nt (1)

[0107] Among them, P ni N represents the percentage of discovered oil and gas reservoirs in a specific sedimentary facies i; i N represents the cumulative number of oil and gas reservoirs discovered in a specific sedimentary facies i; t The total number of oil and gas reservoirs discovered in the target stratigraphic level of the study area;

[0108] Step 500: Calculate a second ratio of the oil and gas reserves controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0109] Specifically, the percentage of geological reserves within the distribution range of different sedimentary facies is calculated according to formula (2):

[0110] P ri =R i / R t (2)

[0111] Among them, P ri R represents the percentage of geological reserves discovered in a specific sedimentary facies i; i R represents geological reserves discovered in a specific sedimentary facies i; t All geological reserves discovered in the target stratigraphic level of the study area;

[0112] Example 3

[0113] Based on the above embodiments, see Figure 4 Step 200 of a hydrocarbon accumulation evaluation method based on carbonate sedimentary facies includes:

[0114] Step 201: Generate the reservoir-controlling index of the current type of sedimentary facies based on the first ratio and the second ratio.

[0115] Specifically, the joint indicator index of the number of oil and gas reservoirs and geological reserves is calculated according to formula (3):

[0116] P i =P ni +P ri (3)

[0117] Among them, P i P is a combined indicator of the number of discovered oil and gas reservoirs and their geological reserves in a specific sedimentary facies i. ni P represents the percentage of discovered oil and gas reservoirs in a specific sedimentary facies i; ri The percentage of geological reserves discovered in a specific sedimentary facies i;

[0118] Next, the reservoir-controlling index of the current type of sedimentary facies is calculated based on the joint indicator index.

[0119] In some embodiments, see Figure 5 Step 200 of a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies further includes:

[0120] Step 202: Determine the first weight of the first ratio based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area;

[0121] Step 203: Determine the second weight of the second ratio based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area;

[0122] Step 204: Generate the reservoir control index of the current type of sedimentary facies based on the first ratio, the first weight, the second ratio, and the second weight.

[0123] In steps 202 to 204, both the number and reserves of oil and gas reservoirs can reflect the possibility of developing oil and gas reservoirs within the sedimentary facies type. However, the number of oil and gas reservoirs ultimately reflects more on the geological reserves. Therefore, the reserves of oil and gas reservoirs should have more weight in order to more objectively and accurately reflect the controlling role of sedimentation on oil and gas accumulation. Taking into account the actual geological conditions, the joint indicator index of the number of oil and gas reservoirs and geological reserves is calculated according to formula (4):

[0124] P i =0.25*P ni +0.75P ri (4)

[0125] Among them, P i P is a combined indicator of the number of discovered oil and gas reservoirs and their geological reserves in a specific sedimentary facies i. ni P represents the percentage of discovered oil and gas reservoirs in a specific sedimentary facies i; ri This represents the percentage of geological reserves discovered in a specific sedimentary facies i.

[0126] Next, the reservoir-controlling index of the current type of sedimentary facies is calculated based on the joint indicator index.

[0127] Example 4

[0128] Based on the above embodiments, see Figure 6 Step 201 of a hydrocarbon accumulation evaluation method based on carbonate sedimentary facies includes:

[0129] Step 2011: Generate a joint indicator index of the current type of sedimentary facies based on the first ratio and the second ratio;

[0130] Step 2012: Calculate the joint indicator index for all types of sedimentary facies to determine the largest joint indicator index;

[0131] Step 2013: Generate the reservoir-controlling index of the current type of sedimentary facies based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0132] In steps 2011 to 2013, the sedimentary facies type with the highest combined number of oil and gas reservoirs and reserve percentage is assigned a value of 1, and the other sedimentary facies types are assigned corresponding values ​​proportionally; and the reservoir control index of the current sedimentary facies type is calculated according to formula (5):

[0133] P di =P i / P max (5)

[0134] Among them, P di P is the reservoir-controlling index for a specific sedimentary facies. i P is a combined indicator of the number of discovered oil and gas reservoirs and their geological reserves in a specific sedimentary facies i. max The percentage of geological reserves discovered in a specific sedimentary facies i;

[0135] Example 5

[0136] To further illustrate the scheme, based on the above embodiments, this embodiment provides an application example using a specific basin to further explain a method for evaluating hydrocarbon accumulation based on sedimentary facies. (See [link to relevant documentation]). Figure 7 The method includes the following steps:

[0137] S1: Obtain the number of target layer oil and gas reservoirs and their corresponding reserve characteristics in the study area;

[0138] The target oil and gas reservoir in the study area is a single oil and gas reservoir in the geological sense located at the target stratum; the reserves are the geological reserves of the oil and gas reservoir; if the distribution of a single oil and gas reservoir spans multiple sedimentary facies types, the geological reserves of the oil and gas reservoir in different sedimentary facies types are calculated in batches according to their area.

[0139] S2: Obtain the sedimentary facies type and planar distribution characteristics of the target layer in the study area;

[0140] For details, see Figure 8 To obtain information on all sedimentary facies types and their planar distribution within the target layer, such as a sedimentary facies planar distribution map;

[0141] S3: Statistical analysis of the number and size of oil and gas reservoirs within different sedimentary facies types of the target layer.

[0142] S4: Statistically count the number and percentage of oil and gas reservoirs in different sedimentary facies types within the target layer.

[0143] For steps S3 and S4, please refer to Table 1 for details. Figure 9 The cumulative number of oil and gas reservoirs and oil and gas reserves within the distribution range of different sedimentary facies were counted respectively.

[0144] Table 1. Relationship between sedimentary facies types and hydrocarbon accumulation probability of target strata in a study area of ​​a basin.

[0145] sedimentary facies types Percentage of items (%) Phased probability assignment Platform edge phase 43 1 Taiwan beach facies 29 0.7 Limitations - Open plateau facies 20 0.5 slope phase 7 0.2 Basin facies 1 0.1

[0146] S5: Comprehensive characterization of sedimentary facies-controlled reservoir characteristics under the combined indication of the number and scale of oil and gas reservoirs.

[0147] Specifically, it describes the sedimentary facies-controlled reservoir characteristics:

[0148] Reservoir space: Different sedimentary facies have different reservoir space characteristics, such as porosity and permeability, which affect the distribution and accumulation of oil and gas in the formation.

[0149] Accumulation conditions: Different sedimentary facies have different accumulation conditions. For example, different types of sedimentary rocks, such as sandstone and carbonate rocks, may play different controlling roles in hydrocarbon accumulation.

[0150] Structural features: The relationship between sedimentary facies and structural features is also very important. Structural features such as structural traps and fault zones are closely related to the distribution of different sedimentary facies.

[0151] S6: Establish a standardized model of the relationship between sedimentary facies types and hydrocarbon accumulation;

[0152] S7: Quantitatively characterize the probability distribution of hydrocarbon accumulation under the control of sedimentary facies in the target layer of the study area.

[0153] Specifically, see Figure 10 The finalized sedimentary facies-sedimentary facies type relationship model was applied to the entire study area, and the distribution characteristics of hydrocarbon accumulation probability under the control of sedimentary facies were quantitatively characterized.

[0154] This disclosure provides a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies. First, it determines the number of hydrocarbon reservoirs controlled by different types of sedimentary facies within the study area, as well as the hydrocarbon reserves of those reservoirs. Then, based on the number of hydrocarbon reservoirs controlled by the current sedimentary facies type, the hydrocarbon reserves controlled by the current sedimentary facies type, the total number of hydrocarbon reservoirs in the study area, and the total hydrocarbon reserves, it generates a reservoir-controlling index for the current sedimentary facies type. This digitizes key parameters based on the number of discovered hydrocarbon reservoirs and geological reserves within different sedimentary facies types. Finally, using geostatistical methods, it establishes a digital model between the probability of hydrocarbon accumulation and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effect of sedimentary facies.

[0155] In summary, this application example provides a method for digitizing key parameters based on information related to the number of discovered oil and gas reservoirs and geological reserves within different sedimentary facies types. This allows for the establishment of a digital model relating reservoir formation probability and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effects of sedimentary facies. This method is particularly suitable for areas with some oil and gas discoveries and production capacity, relatively complex sedimentary facies types, and unclear reservoir-controlling effects. It can provide effective guidance for subsequent hydrocarbon potential assessments, identification of favorable exploration areas, and enhance geological understanding.

[0156] Example 6

[0157] Based on the same inventive concept, this application also provides an oil and gas accumulation evaluation device based on carbonate sedimentary facies, which can be used to implement the method described in the above embodiments, as shown in the following embodiments. Since the principle of solving the problem by the oil and gas accumulation evaluation device based on carbonate sedimentary facies is similar to that of the oil and gas accumulation evaluation method based on carbonate sedimentary facies, the implementation of the oil and gas accumulation evaluation device based on carbonate sedimentary facies can refer to the implementation of the oil and gas accumulation evaluation method based on carbonate sedimentary facies, and repeated details will not be elaborated further. As used below, the term "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0158] The embodiments of the present invention provide a specific implementation of a hydrocarbon accumulation evaluation device based on carbonate sedimentary facies, capable of realizing a hydrocarbon accumulation evaluation method based on carbonate sedimentary facies, wherein, see [link to relevant documentation]. Figure 11 A hydrocarbon accumulation evaluation device based on carbonate sedimentary facies includes:

[0159] Oil and gas reservoir determination module 10 is used to determine the number of oil and gas reservoirs controlled by different types of sedimentary facies in the study area and the oil and gas reserves of the oil and gas reservoirs.

[0160] The reservoir control index generation module 20 is used to generate the reservoir control index of the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0161] The distribution feature characterization module 30 is used to characterize the hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies based on the hydrocarbon accumulation control index of the current type of sedimentary facies, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0162] In some embodiments, the reservoir identification module includes:

[0163] The distribution feature acquisition unit is used to acquire the distribution features corresponding to different types of sedimentary facies within the study area; wherein, the distribution features include: planar distribution features and depth distribution features;

[0164] An oil and gas reservoir determination unit is used to determine the number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs based on the distribution characteristics.

[0165] In some embodiments, a hydrocarbon accumulation evaluation device based on carbonate sedimentary facies further includes:

[0166] The first ratio calculation module is used to calculate the first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0167] The second ratio calculation module is used to calculate the second ratio of the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0168] In some embodiments, the controlled storage index generation module includes:

[0169] The first unit for generating the reservoir control index is used to generate the reservoir control index of the current type of sedimentary facies based on the first ratio and the second ratio.

[0170] In some embodiments, the controlled storage index generation module further includes:

[0171] The first weight calculation unit is used to determine the first weight of the first ratio based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area.

[0172] The second weight calculation unit is used to determine the second weight of the second ratio based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area.

[0173] The second unit for generating the reservoir control index is used to generate the reservoir control index of the current type of sedimentary facies based on the first ratio, the first weight, the second ratio, and the second weight.

[0174] In some embodiments, the first unit for generating the controlled storage index includes:

[0175] A joint indicator index generation unit is used to generate a joint indicator index of the current type of sedimentary phase based on the first ratio and the second ratio;

[0176] The maximum index determination unit is used to calculate the joint indicator index for all types of sedimentary facies in order to determine the maximum joint indicator index;

[0177] The sedimentary control index generation subunit is used to generate a sedimentary control index for the current type of sedimentary facies based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0178] As described above, embodiments of the present invention provide an oil and gas reservoir evaluation device based on carbonate sedimentary facies, comprising: an oil and gas reservoir determination module, used to determine the number of oil and gas reservoirs controlled by different types of sedimentary facies in the study area and the oil and gas reserves of the oil and gas reservoirs; a reservoir control index generation module, used to generate a reservoir control index of the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves; and a distribution feature characterization module, used to characterize the oil and gas reservoir accumulation probability distribution characteristics of the current type of sedimentary facies based on the reservoir control index of the current type of sedimentary facies, so as to evaluate the oil and gas accumulation effect corresponding to the current type of sedimentary facies.

[0179] In summary, this disclosure provides an apparatus for digitizing key parameters based on information related to the number of discovered oil and gas reservoirs and geological reserves within different sedimentary facies types. This establishes a digital model relating reservoir formation probability and sedimentary facies type, thereby quantitatively characterizing the hydrocarbon-controlling effect of sedimentary facies. This method is particularly suitable for areas with some oil and gas discoveries and production capacity, relatively complex sedimentary facies types, and unclear reservoir-controlling effects. It can provide effective guidance for subsequent hydrocarbon potential assessment, identification of favorable exploration areas, and enhance geological understanding.

[0180] Example 7

[0181] Based on the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0182] In some embodiments of this example, a computer-readable storage medium is provided, on which a computer program is stored. When executed by a processor, the computer program implements the steps of the method described in the above embodiments, specifically including the following:

[0183] Determine the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area, as well as the oil and gas reserves of those reservoirs.

[0184] The reservoir control index of the current sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0185] The hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies are characterized by the hydrocarbon accumulation control index, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0186] In some embodiments, determining the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area and the oil and gas reserves of the reservoirs includes:

[0187] The distribution characteristics of different types of sedimentary facies within the study area are obtained; wherein, the distribution characteristics include: planar distribution characteristics and depth distribution characteristics;

[0188] The number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs are determined based on the distribution characteristics.

[0189] In some embodiments, a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies further includes:

[0190] Calculate a first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0191] Calculate a second ratio of the oil and gas reserves controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0192] In some embodiments, a reservoir-controlling index for the current type of sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves, including:

[0193] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio and the second ratio.

[0194] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves further includes:

[0195] The first weight of the first ratio is determined based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area.

[0196] The second weight of the second ratio is determined based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area.

[0197] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio, the first weight, the second ratio, and the second weight.

[0198] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the first ratio and the second ratio includes:

[0199] A joint indicator index for the current type of sedimentary facies is generated based on the first ratio and the second ratio;

[0200] Calculate the joint indicator index for all types of sedimentary facies to determine the largest joint indicator index;

[0201] The reservoir-controlling index of the current type of sedimentary facies is generated based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0202] In some embodiments of this example, a computer program product is provided, including a computer program / instructions, which, when executed by a processor, implements the steps of the method described in the above embodiments, specifically including the following:

[0203] Determine the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area, as well as the oil and gas reserves of those reservoirs.

[0204] The reservoir control index of the current sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves.

[0205] The hydrocarbon accumulation probability distribution characteristics of the current type of sedimentary facies are characterized by the hydrocarbon accumulation control index, so as to evaluate the hydrocarbon accumulation corresponding to the current type of sedimentary facies.

[0206] In some embodiments, determining the number of oil and gas reservoirs controlled by different types of sedimentary facies within the study area and the oil and gas reserves of the reservoirs includes:

[0207] The distribution characteristics of different types of sedimentary facies within the study area are obtained; wherein, the distribution characteristics include: planar distribution characteristics and depth distribution characteristics;

[0208] The number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs are determined based on the distribution characteristics.

[0209] In some embodiments, a method for evaluating hydrocarbon accumulation based on carbonate sedimentary facies further includes:

[0210] Calculate a first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs;

[0211] Calculate a second ratio of the oil and gas reserves controlled by the current type of sedimentary facies to the total oil and gas reserves.

[0212] In some embodiments, a reservoir-controlling index for the current type of sedimentary facies is generated based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves, including:

[0213] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio and the second ratio.

[0214] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the study area, and the total oil and gas reserves further includes:

[0215] The first weight of the first ratio is determined based on the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the study area.

[0216] The second weight of the second ratio is determined based on the oil and gas reserves of the oil and gas reservoir controlled by the current type of sedimentary facies and the total oil and gas reserves in the study area.

[0217] The reservoir-controlling index of the current type of sedimentary facies is generated based on the first ratio, the first weight, the second ratio, and the second weight.

[0218] In some embodiments, generating a reservoir-controlling index for the current type of sedimentary facies based on the first ratio and the second ratio includes:

[0219] A joint indicator index for the current type of sedimentary facies is generated based on the first ratio and the second ratio;

[0220] Calculate the joint indicator index for all types of sedimentary facies to determine the largest joint indicator index;

[0221] The reservoir-controlling index of the current type of sedimentary facies is generated based on the joint indicator index of the current type of sedimentary facies and the largest joint indicator index.

[0222] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for executing the methods in the above embodiments.

[0223] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media may include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, and computer storage media (e.g., hard disks, floppy disks, solid-state drives, removable disks, CD-ROMs, DVD-ROMs, Blu-ray discs, etc.).

[0224] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0225] In addition, the computer device may include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., keyboard, mouse, speakers, etc.).

[0226] The processor can communicate with external devices via the I / O bus through wired or wireless networks.

[0227] In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions are executed by a processor to perform the steps of the various functions and / or methods in the embodiments described herein.

[0228] In the embodiments provided in this disclosure, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this disclosure. 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 marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive 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 a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0229] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0230] While the embodiments disclosed herein are as described above, the foregoing content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A carbonate rock sediment facies-based oil and gas reservoir evaluation method, characterized by, The method comprises the following steps: determining the number of oil and gas reservoirs controlled by different types of sedimentary facies in a research area and the oil and gas reserves of the oil and gas reservoirs; generating a reservoir-controlling index of the current type of sedimentary facies according to the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the research area and the total oil and gas reserves; characterizing the oil and gas accumulation probability distribution characteristics of the current type of sedimentary facies according to the reservoir-controlling index of the current type of sedimentary facies to evaluate the oil and gas accumulation of the current type of sedimentary facies.

2. The method of claim 1, wherein, The determination of the number of oil and gas reservoirs controlled by different types of sedimentary facies in the research area and the oil and gas reserves of the oil and gas reservoirs comprises the following steps: obtaining the distribution characteristics corresponding to different types of sedimentary facies in the research area; wherein the distribution characteristics comprise plane distribution characteristics and depth distribution characteristics; determining the number of oil and gas reservoirs and the oil and gas reserves of the oil and gas reservoirs according to the distribution characteristics.

3. The method of claim 2, wherein, The method further comprises the following steps: calculating a first ratio of the number of oil and gas reservoirs controlled by the current type of sedimentary facies to the total number of oil and gas reservoirs; calculating a second ratio of the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies to the total oil and gas reserves.

4. The method of claim 3, wherein, The generation of the reservoir-controlling index of the current type of sedimentary facies according to the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the research area and the total oil and gas reserves comprises the following steps: generating the reservoir-controlling index of the current type of sedimentary facies according to the first ratio and the second ratio.

5. The method of claim 4, wherein, The generation of the reservoir-controlling index of the current type of sedimentary facies according to the number of oil and gas reservoirs controlled by the current type of sedimentary facies, the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies, the total number of oil and gas reservoirs in the research area and the total oil and gas reserves further comprises the following steps: determining a first weight of the first ratio according to the number of oil and gas reservoirs controlled by the current type of sedimentary facies and the total number of oil and gas reservoirs in the research area; determining a second weight of the second ratio according to the oil and gas reserves of the oil and gas reservoirs controlled by the current type of sedimentary facies and the total oil and gas reserves in the research area; generating the reservoir-controlling index of the current type of sedimentary facies according to the first ratio, the first weight, the second ratio and the second weight.

6. The method according to any one of claims 3 to 5, characterized in that, The generation of the reservoir-controlling index of the current type of sedimentary facies according to the first ratio and the second ratio comprises the following steps: generating a joint indication index of the current type of sedimentary facies according to the first ratio and the second ratio; calculating the joint indication indexes of all types of sedimentary facies to determine the maximum joint indication index; generating the reservoir-controlling index of the current type of sedimentary facies according to the joint indication index of the current type of sedimentary facies and the maximum joint indication index.

7. A device for evaluating oil and gas accumulation based on carbonate rock sedimentary facies, characterized in that, The method comprises the following steps: an oil and gas reservoir determination module for determining the number of oil and gas reservoirs controlled by different types of sedimentary facies in a research area and the oil and gas reserves of the oil and gas reservoirs; a reservoir control index generating module, configured to generate a reservoir control index of the current type of sedimentary facies according to a number of reservoirs controlled by the current type of sedimentary facies, a hydrocarbon reserve of the reservoirs controlled by the current type of sedimentary facies, a total number of reservoirs in the study area, and a total hydrocarbon reserve; a distribution feature depicting module, configured to depict a hydrocarbon accumulation probability distribution feature of the current type of sedimentary facies according to the reservoir control index of the current type of sedimentary facies, so as to evaluate a hydrocarbon accumulation of the current type of sedimentary facies.

8. A computer device comprising a memory, a processor, and a computer program stored on the memory, wherein the computer program comprises instructions that, when executed by the processor, cause the processor to perform the method of any one of claims 1-7. The processor executes the computer program to implement the steps of the method for evaluating hydrocarbon accumulation of carbonate sedimentary facies according to any one of claims 1 to 6.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method for evaluating hydrocarbon accumulation of carbonate sedimentary facies according to any one of claims 1 to 6.

10. A computer program product comprising computer programs / instructions, characterized in that, The computer program is executed by the processor to implement the steps of the method for evaluating hydrocarbon accumulation of carbonate sedimentary facies according to any one of claims 1 to 6.

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