A method and system for analyzing the type of continuous tight sandstone reservoir in a single well

Abstract

The present application discloses a method and system for analyzing the type of continuous tight sandstone reservoir in a single well, and relates to the technical field of mineral resource development. The method comprises obtaining core data and logging data of core sampling points in single well drilling; the core data comprises core casting thin sections, core porosity and permeability; based on the identification results of core casting thin sections, determining the rock characteristics of the core sampling points; using rock characteristics, core porosity and permeability, inverting and establishing the main components and contents of the continuous sandstone section of a single well, and the diagenetic phase type, porosity and permeability curve; using the main components and contents of the continuous sandstone section of a single well, and the diagenetic phase type, porosity and permeability, obtaining the continuous reservoir type curve of the sandstone section of a single well; and continuously interpreting the sandstone reservoir type of a single well according to the continuous reservoir type curve of the sandstone section of a single well. The present application can quickly and accurately provide important information about core characteristics and reservoir types.

Description

Technical Field

[0001] The present application relates to the technical field of mineral resource development, and in particular to a method and system for analyzing the type of continuous dense sandstone reservoir in a single well. Background Art

[0002] Tight sandstone gas is one of the largest unconventional natural gas currently being developed. Tight sandstone reservoirs usually undergo a complex diagenetic evolution history, and the reservoir type is controlled by many geological factors in time and space. Among them, the main components and content of sandstone and the diagenetic phase type are the key factors that determine the reservoir type. Using core samples for thin section identification and porosity and permeability testing to identify reservoir types is a relatively effective method. In the process of tight sandstone reservoir development, the main problems in using core samples for reservoir type analysis are as follows:

[0003] 1) Drilling coring is expensive and time-consuming, so the coring length of each well is limited. At the same time, the identification of core sampling slices and porosity tests at a certain depth point cannot achieve the identification and analysis of reservoir types at non-sampling points, non-coring sections, and non-coring wells. 2) Core sampling slice identification and porosity tests, from sample collection, sample preparation, and experimental testing, take a long time and cannot meet the needs of efficient oil and gas development. Summary of the invention

[0004] The purpose of this application is to provide a single-well continuous tight sandstone reservoir type analysis method and system, aiming to realize reservoir type analysis of non-sampling points, non-coring sections and non-coring wells, and ensure that the accuracy of reservoir type interpretation and gas content are highly matched.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a method for analyzing the type of continuous tight sandstone reservoirs in a single well, the method comprising:

[0007] Obtaining core data and logging data at core sampling points in single well drilling; the core data includes core casting thin sections, core porosity and permeability;

[0008] Based on the identification results of the core casting thin sections, determining the rock characteristics of the core sampling points; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type;

[0009] Using the rock characteristics, the core porosity and the permeability, inversion is performed to establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of a single well continuous sandstone section;

[0010] Using the main components and contents of the rocks in the continuous sandstone section of the single well, as well as the diagenetic phase type, porosity and permeability, a continuous reservoir type curve of the sandstone section of the single well is obtained;

[0011] The continuous reservoir type of the sandstone section of the single well is determined based on the continuous reservoir type curve of the sandstone section of the single well and combined with the lower limit of the reservoir thickness.

[0012] Optionally, the logging data include values ​​of natural gamma, acoustic time difference, deep lateral resistivity, formation density, neutron and mud content.

[0013] Optionally, using the rock characteristics, the core porosity and the permeability, inversion is performed to establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of a single well continuous sandstone section, specifically including:

[0014] The identification results of the core cast thin sections at the core sampling points were set as standard points. For the sandstone section, Tech log software was used to invert the main components and contents of the rocks using natural gamma, acoustic wave time difference, deep lateral resistivity, formation density, neutron and mud content as parameters and the point spacing of the parameters as 0.125m. A continuous main component and content curve of the single well sandstone section was constructed based on continuous data points.

[0015] Optionally, the rock characteristics, the core porosity and the permeability are used to invert and establish the main components and contents of the continuous sandstone section of a single well and the diagenetic phase type, porosity and permeability curve, specifically including:

[0016] The core porosity and permeability are set as standard points. For the sandstone section, a decision tree algorithm is used with sonic time difference, neutron, formation density, mud content and sand quality as parameters. The point spacing of the parameters is 0.125m, and porosity and permeability inversion is performed. Continuous porosity curves and permeability curves of the sandstone section of a single well are constructed based on continuous data points.

[0017] Optionally, using the rock characteristics, the core porosity and the permeability, inversion is performed to establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of a single well continuous sandstone section, specifically including:

[0018] Based on the diagenetic facies type of the core sampling points, for the sandstone section, the BaggedTree algorithm was used, with natural gamma, acoustic time difference, deep lateral resistivity, formation density, neutron and mud content as parameters, and the parameter point spacing of 0.125m, to perform diagenetic phase evolution, and a diagenetic facies type curve was constructed based on continuous data points.

[0019] Optionally, the rock components include sand, calcium, mud and pores.

[0020] Optionally, the diagenetic phase types include strong compaction phase, strong dissolution phase, medium dissolution phase, weak dissolution phase and strong cementation phase.

[0021] Optionally, the single-well sandstone reservoir types at the core sampling points include Class I, Class II and Class III.

[0022] Optionally, the classification method of the single well sandstone reservoir type specifically includes:

[0023] Taking 0.25 m as the lower limit of the reservoir thickness and the parameter point spacing as 0.125 m, three continuous parameter points for analyzing the sandstone reservoir type of the single well are determined;

[0024] If three consecutive parameter points are of the same type of reservoir, the sandstone reservoir type of the single well is Class I;

[0025] If three consecutive parameter points are two different types of reservoirs, the sandstone reservoir type of the single well is type II;

[0026] If three consecutive parameter points are three different types of reservoirs, the sandstone reservoir type of the single well is Class III.

[0027] In a second aspect, the present application provides a single well continuous tight sandstone reservoir type analysis system, comprising:

[0028] A data acquisition module is used to obtain core data and logging data of core sampling points in single well drilling; the core data includes core casting thin sections, core porosity and permeability;

[0029] An identification module, for determining the rock characteristics of the core sampling point based on the identification result of the core casting thin section; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type;

[0030] The first inversion module is used to invert and establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of the continuous sandstone section of a single well by using the rock characteristics, the core porosity and the permeability;

[0031] The second inversion module is used to obtain a continuous reservoir type curve of the single well sandstone section by using the main components and contents of the single well continuous sandstone section rock and the diagenetic phase type, porosity and permeability;

[0032] The analysis module is used to determine the continuous reservoir type of the sandstone section of the single well according to the continuous reservoir type curve of the sandstone section of the single well and in combination with the lower limit of the reservoir thickness.

[0033] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0034] The present application provides a method and system for analyzing the type of continuous tight sandstone reservoir in a single well, including: obtaining core data and logging data at core sampling points. These data are the key basis for analyzing core characteristics and reservoirs. Detailed identification of core casting thin sections can be carried out to identify various minerals in rocks through high-definition image recognition or machine learning technology, thereby determining the rock characteristics of the core. These characteristics include the main components and contents of rocks and the types of diagenetic phases; the porosity and permeability of the core are analyzed. Porosity refers to the volume ratio of pore space in rocks, while permeability measures the connectivity of these pores and the ability to allow fluids to pass through; using the above-mentioned rock characteristics and porosity and permeability data, inversion modeling is performed, that is, the main components and contents, diagenetic phase types, porosity and permeability change curves of the entire single well continuous sandstone section are inferred based on limited sampling point data; based on the data obtained by inversion modeling, the continuous reservoir type of the single well sandstone section is further analyzed. It will identify different reservoir types and draw the corresponding continuous reservoir type curve; finally, based on the reservoir type curve and the lower limit of reservoir thickness, the continuous reservoir type of the sandstone section of the single well is determined. This is of great significance for oil and gas exploration and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is an application environment diagram of a method for analyzing the type of a single-well continuous tight sandstone reservoir in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of a flow chart of a method for analyzing the type of continuous tight sandstone reservoir in a single well provided in one embodiment of the present application;

[0038] Figure 3 A column chart of the interpretation of continuous reservoir types in the S2-2-1 sandstone section of the Shanxi Formation in Well A12 provided in one embodiment of the present application

[0039] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0042] The single well continuous tight sandstone reservoir type analysis method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the terminal 102 communicates with the server 104 through a network. The data storage system can store data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send the core data and logging data to be processed to the server 104. After receiving the core data and logging data to be processed, the server 104 determines the rock characteristics of the core sampling point based on the identification results of the core casting thin section; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type; using the rock characteristics, the core porosity and the permeability, inversion is used to establish the main component and content curve and diagenetic phase type curve, porosity curve and permeability curve of the continuous sandstone section of a single well; using the main component and content of the continuous sandstone section of the single well and the diagenetic phase type, porosity and permeability, a continuous reservoir type curve of the sandstone section of the single well is obtained; according to the continuous reservoir type curve of the sandstone section of the single well, combined with the lower limit of the reservoir thickness, the continuous reservoir type of the sandstone section of the single well is determined. The server 104 can feedback the obtained sandstone reservoir type of the single well to the terminal 102. In addition, in some embodiments, the single-well continuous tight sandstone reservoir type analysis method can also be implemented independently by the server 104 or the terminal 102. For example, the terminal 102 can directly perform data processing on the core data and logging data to be processed, or the server 104 can obtain the core data and logging data to be processed from the data storage system and perform data processing on the core data and logging data to be processed.

[0043] In an exemplary embodiment, Figure 2 As shown, a method for analyzing the type of continuous tight sandstone reservoir in a single well is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1The server 104 in the example is used for explanation, and the steps include the following steps 201 to 208.

[0044] in:

[0045] Step 201: Acquire core data and logging data of core sampling points in single well drilling; the core data include core casting thin sections, core porosity and permeability.

[0046] Step 202: Based on the identification result of the core casting thin section, determine the rock characteristics of the core sampling point; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type.

[0047] Step 203: using the rock characteristics, the core porosity and the permeability, inversion is performed to establish the main component and content curves of the continuous sandstone section of a single well, the diagenetic phase type curve, the porosity curve and the permeability curve.

[0048] Step 204: Obtain a continuous reservoir type curve of the single well sandstone section using the main components and contents of the single well continuous sandstone section and the diagenetic phase type, porosity and permeability.

[0049] Step 205: Determine the continuous reservoir type of the sandstone section of the single well according to the continuous reservoir type curve of the sandstone section of the single well and the lower limit of the reservoir thickness. The sandstone section is a layer section with a logging shale content (SH) greater than 50%.

[0050] When executing step 201, the specific steps may be as follows:

[0051] When obtaining core cast slices, core cast slices are core samples obtained through drilling and coring operations. During the drilling process, the drill bit grinds the underground rock at a slow speed to form a wellbore, which takes a considerable amount of time. The coring operation, on the other hand, uses specific technology during the drilling process to completely remove the rock from thousands of meters underground without destroying the integrity of the rock. Each coring operation is usually limited to a depth of 10 meters, which means that after each 10-meter core is obtained, it is necessary to repeatedly lift and lower the drill, spanning a distance of thousands of meters. This operation process is not only time-consuming and costly, but also has a high risk of engineering accidents. Therefore, during the drilling process, only a small amount of coring operations are usually performed in key layers.

[0052] Therefore, it is necessary to obtain the logging data while obtaining the core casting thin section. In this embodiment, the logging data includes the values ​​of natural gamma (GR), acoustic time difference (AC), deep lateral resistivity (LLD), formation density (DEN), neutron (CNL), and shale content (SH), and the distance between data points is 0.125m.

[0053] When executing step 202, the specific steps may be as follows:

[0054] The main components of the rocks at the core sampling points include three categories: sandy (including quartz, feldspar and rock fragments), calcareous (including calcite, ankerite, siderite), and muddy (including montmorillonite, kaolinite, illite, and chlorite).

[0055] The main diagenetic phase types of the rocks at the core sampling points include strong compaction phase, strong dissolution phase, medium dissolution phase, weak dissolution phase, and strong cementation phase.

[0056] The different types of reservoirs include Class I, Class II, and Class III according to the reservoir quality from good to bad.

[0057] Among them, the identification results of the casting thin section are shown in Table 1:

[0058] Table 1 Identification results of thin sections of the S2-2-1 layer of the Shanxi Formation in Well A12

[0059]

[0060] Among them, the reservoir types are divided by porosity and permeability, and the main component content ranges and diagenetic phase types of different types of reservoirs are statistically analyzed, as shown in Table 2:

[0061] Table 2 Classification of reservoir types of the Shanxi Formation S2-2-1 sublayer in Well A12 and statistics of the main component content ranges and diagenetic phase types of different types of reservoirs

[0062]

[0063]

[0064] In some implementations of this embodiment, when executing steps 203-204, the specific steps may be as follows:

[0065] The identification results of the core cast thin sections at the core sampling points were set as standard points. For the sandstone section, Tech log software was used to invert the main components and contents of the rock using natural gamma, acoustic time difference, deep lateral resistivity, formation density, neutron and mud content as parameters. The logging parameter point spacing was set to 0.125 m, and the continuous main component and content curves of the single well sandstone section were constructed based on continuous data points.

[0066] The core porosity and permeability are set as standard points. For the sandstone section, the decision tree algorithm is used to perform porosity and permeability inversion with AC, CNL, DEN, SH and sand quality as parameters. The spacing between logging parameter points is set to 0.125m, and continuous porosity and permeability curves of the sandstone section of a single well are constructed based on continuous data points.

[0067] Based on the diagenetic facies type of the core sampling point, the BaggedTree algorithm was used to perform diagenetic phase evolution for the sandstone section with GR, AC, DEN, CNL, SH and LLD as parameters. The spacing of the logging parameter points was set to 0.125m, and a continuous diagenetic facies curve of the sandstone section of a single well was constructed based on continuous data points.

[0068] The BaggedTree algorithm is used to determine the reservoir type for the sandstone section based on the main components and content, porosity, permeability, and diagenetic phase.

[0069] Specifically, the specific method for continuously analyzing the sandstone reservoir type of a single well is to take 0.25m as the lower limit of the reservoir thickness, and determine the layer segment with 3 or more consecutive points of the same type of reservoir determination results as this type of reservoir. If three consecutive points are two different types of reservoirs, it is determined to be the type with lower reservoir quality. If three consecutive points are three different types of reservoirs, it is determined to be the type with the lowest reservoir quality.

[0070] The present application also provides an application scenario, which applies the above-mentioned single-well continuous tight sandstone reservoir type analysis method. Specifically: Figure 3 As shown in the figure, the interpretation effect of continuous reservoir types in the S2-2-1 small sandstone section of the Shanxi Formation in the A well area of ​​the Daniudi gas field in the northern Ordos Basin: the parameter "reservoir type matching degree" is used to quantitatively evaluate the accuracy and reliability of the reservoir type interpretation results; the I and II reservoir type matching degrees reflect the proportion of the total thickness of reservoirs with good storage capacity (type I and type II reservoirs) relative to the total thickness of gas layers and poor gas layers, among which the single layer thickness of reservoirs with good storage capacity (type I and type II reservoirs) is represented from top to bottom by a1, a2...a n Indicated by unit m, the single layer thickness of the air layer and the differential air layer is A1, A2, ... A from top to bottom n The unit is m. The matching degree of type III reservoir reflects the proportion of the total thickness of the reservoir with basically no storage capacity (type III reservoir) to the total thickness of the dry layer. The single layer thickness of the reservoir with basically no storage capacity (type III reservoir) is represented by b1, b2, ... c from top to bottom. n Indicated by unit m, the thickness of a single layer of dry layer is expressed from top to bottom as B1, B2...B n Indicated by m. The specific formula is as follows:

[0071] I, II type reservoir type matching degree = (ha1 + a2 + ... + a n ) / (A1+A2+……+A n ).

[0072] Class III reservoir type matching degree = (b1+b2+…+b n ) / (B1+B2+……+B n).

[0073] like Figure 3 As shown in the figure, the continuous reservoir type interpretation bar chart of the sandstone section of a single well intuitively and qualitatively shows that the reservoir type discrimination results based on the casting thin section identification results, porosity and permeability, and logging data have a good match with the gas layer and poor gas layer; and the quantitative statistics and analysis of the reservoir type matching degree also show that the use of this method to continuously discriminate the tight sandstone reservoir type has a high reliability, and the reservoir type matching degree of all wells is between 85% and 110%, as shown in Table 3 below:

[0074] Table 3 Reservoir type matching statistics of the S2-2-1 small layer sandstone section of the Shanxi Formation in Well A12

[0075]

[0076] Embodiment 2

[0077] The present application also provides a single well continuous tight sandstone reservoir type analysis system, comprising:

[0078] The data acquisition module is used to obtain core data and logging data of core sampling points in single well drilling; the core data includes core casting thin sections, core porosity and permeability.

[0079] The identification module is used to determine the rock characteristics of the core sampling point based on the identification results of the core casting thin section; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type.

[0080] The first inversion module is used to invert and establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of a single well continuous sandstone section by using the rock characteristics, the core porosity and the permeability.

[0081] The second inversion module is used to obtain a continuous reservoir type curve of the single well sandstone section by using the main components and contents of the single well continuous sandstone section rock and the diagenetic phase type, porosity and permeability.

[0082] The analysis module is used to determine the continuous reservoir type of the sandstone section of the single well according to the continuous reservoir type curve of the sandstone section of the single well and in combination with the lower limit of the reservoir thickness.

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for analyzing the type of continuous tight sandstone reservoir in a single well, characterized in that: The single well continuous tight sandstone reservoir type analysis method comprises: Obtaining core data and logging data at core sampling points in single well drilling; the core data includes core casting thin sections, core porosity and permeability; Based on the identification results of the core casting thin sections, determining the rock characteristics of the core sampling points; the rock characteristics include rock components, the content of each rock component and the diagenetic phase type; Using the rock characteristics, the core porosity and the permeability, inversion is performed to establish a main component and content curve of a continuous sandstone section in a single well, a diagenetic phase type curve, a porosity curve and a permeability curve; The continuous reservoir type curve of the sandstone section of a single well is obtained by using the main components and contents of the rocks, diagenetic phase type, porosity and permeability of the continuous sandstone section of a single well. Determine the continuous reservoir type of the sandstone section of the single well according to the continuous reservoir type curve of the sandstone section of the single well and in combination with the lower limit of the reservoir thickness; Among them, using the rock characteristics, the core porosity and the permeability, the main components and content curves of the continuous sandstone section of a single well and the diagenetic phase type curve, the porosity curve and the permeability curve are inverted and established, specifically including: Based on the diagenetic facies type of the core sampling points, for the sandstone section, the BaggedTree algorithm was used to perform diagenetic phase evolution with natural gamma, acoustic time difference, deep lateral resistivity, formation density, neutron and shale content as parameters and a parameter point spacing of 0.125 m, and a diagenetic facies type curve was constructed based on continuous data points; The single-well sandstone reservoir types at the core sampling points include Class I, Class II and Class III; The classification method of the single well sandstone reservoir type specifically includes: Taking 0.25 m as the lower limit of the reservoir thickness and the parameter point spacing as 0.125 m, three continuous parameter points for analyzing the sandstone reservoir type of the single well are determined; If three consecutive parameter points are of the same type of reservoir, the sandstone reservoir type of the single well is Class I; If three consecutive parameter points are two different types of reservoirs, the sandstone reservoir type of the single well is type II; If three consecutive parameter points are three different types of reservoirs, the sandstone reservoir type of the single well is Class III.

2. A method for analyzing the type of continuous tight sandstone reservoir in a single well according to claim 1, characterized in that: The logging data include natural gamma, acoustic time difference, deep lateral resistivity, formation density, neutron and mud content values.

3. A method for analyzing the type of continuous tight sandstone reservoir in a single well according to claim 2, characterized in that: By using the rock characteristics, the core porosity and the permeability, the main components and content curves of the continuous sandstone section of a single well and the diagenetic phase type curve, the porosity curve and the permeability curve are inverted and established, specifically including: The identification results of the core cast thin sections at the core sampling points were set as standard points. For the sandstone section, Techlog software was used to invert the main components and contents of the rocks using natural gamma, acoustic wave time difference, deep lateral resistivity, formation density, neutron and mud content as parameters and the point spacing of the parameters as 0.125m. A continuous main component and content curve of the single well sandstone section was constructed based on continuous data points.

4. A method for analyzing the type of continuous tight sandstone reservoir in a single well according to claim 3, characterized in that: By using the rock characteristics, the core porosity and the permeability, the main components and contents of the continuous sandstone section of a single well and the diagenetic phase type, porosity and permeability curves are inverted and established, specifically including: The core porosity and permeability are set as standard points. For the sandstone section, a decision tree algorithm is used with sonic time difference, neutron, formation density, mud content and sand quality as parameters. The point spacing of the parameters is 0.125m, and porosity and permeability inversion is performed. Continuous porosity curves and permeability curves of the sandstone section of a single well are constructed based on continuous data points.

5. The method for analyzing the type of continuous tight sandstone reservoir in a single well according to claim 1, characterized in that: The rock components include sand, calcium, mud and pores.

6. A method for analyzing the type of continuous tight sandstone reservoir in a single well according to claim 5, characterized in that: The diagenetic phase types include strong compaction phase, strong dissolution phase, medium dissolution phase, weak dissolution phase and strong cementation phase.

7. A single-well continuous tight sandstone reservoir type analysis system based on a single-well continuous tight sandstone reservoir type analysis method according to any one of claims 1 to 6, characterized in that: include: A data acquisition module is used to obtain core data and logging data of core sampling points in single well drilling; the core data includes core casting thin sections, core porosity and permeability; An identification module, used to determine the rock characteristics of the core sampling point based on the identification result of the core casting thin section; The rock characteristics include rock components, the content of each rock component and diagenetic phase type; The first inversion module is used to invert and establish the main component and content curves and diagenetic phase type curves, porosity curves and permeability curves of the continuous sandstone section of a single well by using the rock characteristics, the core porosity and the permeability; The second inversion module is used to obtain a continuous reservoir type curve of the single well sandstone section by using the main components and contents of the single well continuous sandstone section rock and the diagenetic phase type, porosity and permeability; The analysis module is used to determine the continuous reservoir type of the sandstone section of the single well according to the continuous reservoir type curve of the sandstone section of the single well and in combination with the lower limit of the reservoir thickness.

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