Reservoir assessment method, device and equipment and computer readable storage medium
By acquiring and normalizing drilling engineering data during the drilling process, and utilizing the intrinsic relationship between mechanical specific energy and gas-based total hydrocarbons for reservoir evaluation, the problems of low efficiency and high cost in reservoir evaluation are solved, and real-time and efficient reservoir performance evaluation is achieved.
Patent Information
- Application Number
- CN202411030309.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2026-01-30
AI Technical Summary
Existing technologies for reservoir assessment are inefficient, rely heavily on logging instruments, and are costly, making it difficult to effectively assess reservoir performance during drilling.
By acquiring drilling engineering data and initial gas logging total hydrocarbon data at the drilling depth, the mechanical specific energy and gas logging total hydrocarbon data are calculated and normalized, and the intrinsic relationship between mechanical specific energy and gas logging total hydrocarbon data is used for reservoir assessment.
It enables real-time reservoir assessment during drilling, improving efficiency, reducing reliance on logging instruments, and lowering costs.
Smart Images
Figure CN121429367A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of petroleum engineering technology, and in particular to a reservoir assessment method, apparatus, equipment, and computer-readable storage medium. Background Technology
[0002] For carbonate reservoirs, the reservoir's oil-bearing capacity (the amount of oil and gas), mobility (the amount of recoverable oil and gas), compressibility (the ease with which the rock fractures; for drilling operations, timely knowledge of compressibility can effectively prevent accidents such as lost circulation and stuck pipe), and storage capacity (the amount of space available to store oil and gas) are mainly positively correlated with the degree of fracture development in the reservoir. Common reservoir assessment methods for evaluating these properties are primarily based on well logging parameters; that is, the larger the sonic transit time (AC) and the smaller the resistivity (RD) and RS, the more developed the fractures, and the better the reservoir.
[0003] However, the well logging data obtained by reservoir assessment methods based on well logging parameters can only be obtained after drilling is completed, resulting in low reservoir assessment efficiency, high requirements for logging instruments, and high costs.
[0004] In summary, how to effectively solve the problems of low reservoir assessment efficiency, high requirements for logging instruments, and high costs is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention
[0005] The purpose of this application is to provide a reservoir assessment method that enables reservoir assessment during drilling, improves reservoir assessment efficiency, reduces reliance on logging instruments, and lowers costs. Another purpose of this application is to provide a reservoir assessment device, equipment, and computer-readable storage medium.
[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:
[0007] A reservoir assessment method, comprising:
[0008] Acquire drilling engineering data sets and initial gas logging total hydrocarbon data for each preset drilling depth within the preset drilling depth range;
[0009] Calculate the initial mechanical specific energy corresponding to each preset drilling depth based on each set of drilling engineering data;
[0010] Each initial mechanical specific energy is normalized to obtain a normalized mechanical specific energy.
[0011] The initial total hydrocarbon data were normalized to obtain normalized total hydrocarbon data.
[0012] Reservoir assessment is performed on the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy.
[0013] In one specific embodiment of this application, reservoir evaluation is performed on the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy, including:
[0014] Generate a gas-based total hydrocarbon curve based on the normalized gas-based total hydrocarbon data described above;
[0015] Generate mechanical specific energy curves based on the normalized mechanical specific energy described above;
[0016] The intersection area of the gas-measured total hydrocarbon curve and the mechanical specific energy curve is determined by the intersection method of the gas-measured total hydrocarbon curve and the mechanical specific energy curve;
[0017] Reservoir assessment is performed on the preset drilling depth section based on the intersection area.
[0018] In one specific embodiment of this application, the initial mechanical specific energy corresponding to each preset drilling depth is calculated based on each set of drilling engineering data, including:
[0019] The initial mechanical specific energy corresponding to each preset drilling depth is calculated using the formula based on each set of drilling engineering data:
[0020] ;
[0021] in, The initial mechanical specific energy, For drilling pressure, The drill bit area, The rotational speed of the turntable. For downhole power drilling tool speed, The diameter of the drill bit. This represents the drilling speed.
[0022] In one specific embodiment of this application, the initial mechanical specific energy is normalized to obtain each normalized mechanical specific energy, including:
[0023] The initial mechanical specific energies were normalized using the formulas to obtain the normalized mechanical specific energies:
[0024] ;
[0025] in, To normalize the mechanical specific energy, The initial mechanical specific energy, It is the minimum value among the initial mechanical specific energies. This represents the maximum value among the initial mechanical specific energies described above.
[0026] In one specific embodiment of this application, the initial total hydrocarbon data are normalized to obtain normalized total hydrocarbon data, including:
[0027] The initial total hydrocarbon data were normalized using the formulas described above to obtain the normalized total hydrocarbon data:
[0028] ;
[0029] in, For normalized gas analysis of total hydrocarbon data, This is the initial total hydrocarbon data from gas analysis. The minimum value among the initial total hydrocarbon data. This is the maximum value among the initial total hydrocarbon data obtained from gas analysis.
[0030] In one specific embodiment of this application, reservoir evaluation is performed on the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy, including:
[0031] The initial reservoir effectiveness index corresponding to each preset drilling depth is calculated using the formula based on the normalized total hydrocarbon data and the normalized mechanical energy.
[0032] ;
[0033] in, This is the initial reservoir effectiveness index. For normalized gas analysis of total hydrocarbon data, Normalized mechanical specific energy;
[0034] The initial reservoir effectiveness indices were normalized using the formulas to obtain the normalized reservoir effectiveness indices:
[0035] ;
[0036] in, The normalized reservoir effectiveness index, This is the initial reservoir effectiveness index. It is the minimum value among the initial reservoir effectiveness indices. The maximum value among the initial reservoir effectiveness indices;
[0037] The reservoir effectiveness of the preset drilling depth range is evaluated based on the normalized reservoir effectiveness index.
[0038] In one specific embodiment of this application, after performing reservoir assessment on the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy, the method further includes:
[0039] Acquire logging data and initial reservoir assessment results obtained from the evaluation;
[0040] Based on the initial reservoir assessment results and the logging data, the target reservoir assessment results are determined.
[0041] A reservoir assessment device, comprising:
[0042] The data acquisition module is used to acquire drilling engineering data sets and initial gas logging total hydrocarbon data for each preset drilling depth within the preset drilling depth range;
[0043] The initial mechanical energy calculation module is used to calculate the initial mechanical energy corresponding to each preset drilling depth based on each set of drilling engineering data.
[0044] The mechanical specific energy normalization module is used to normalize each of the initial mechanical specific energies to obtain each normalized mechanical specific energy.
[0045] The gas measurement full hydrocarbon normalization module is used to normalize each of the initial gas measurement full hydrocarbon data to obtain normalized gas measurement full hydrocarbon data.
[0046] The reservoir assessment module is used to assess the reservoir at the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy.
[0047] A reservoir assessment device, comprising:
[0048] Memory, used to store computer programs;
[0049] A processor for executing the computer program to implement the steps of the reservoir evaluation method as described above.
[0050] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the reservoir evaluation method as described above.
[0051] The reservoir assessment method provided in this application obtains drilling engineering data sets and initial total hydrocarbon data for each preset drilling depth within a preset drilling depth range; calculates the initial mechanical specific energy corresponding to each preset drilling depth based on each drilling engineering data set; normalizes each initial mechanical specific energy to obtain normalized mechanical specific energy; normalizes each initial total hydrocarbon data to obtain normalized total hydrocarbon data; and assesses the reservoir within the preset drilling depth range based on the normalized total hydrocarbon data and the normalized mechanical specific energy.
[0052] As can be seen from the above technical solution, by pre-selecting drilling depth sections, initial total hydrocarbon data and drilling engineering data are acquired in real time and continuously during the drilling process. Based on each set of drilling engineering data, the initial mechanical specific energy corresponding to each preset drilling depth is calculated. Then, each initial total hydrocarbon data and each initial mechanical specific energy are normalized to obtain normalized mechanical specific energy and normalized total hydrocarbon data. By analyzing the intrinsic relationship between mechanical specific energy and total hydrocarbon data, reservoir assessment is performed on the preset drilling depth sections based on the normalized total hydrocarbon data and normalized mechanical specific energy. This achieves reservoir assessment during the drilling process, improves reservoir assessment efficiency, reduces reliance on logging instruments, and lowers costs.
[0053] Accordingly, this application also provides reservoir assessment apparatus, equipment and computer-readable storage medium corresponding to the above-mentioned reservoir assessment methods, which have the above-mentioned technical effects, and will not be repeated here. Attached Figure Description
[0054] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0055] Figure 1 This is a flowchart illustrating one implementation of the reservoir assessment method in this application.
[0056] Figure 2 This is a curve showing the variation of mechanical specific energy with well depth, obtained based on existing mechanical specific energy calculation formulas and the mechanical specific energy calculation formula of this application;
[0057] Figure 3 This is a schematic diagram illustrating the mutual verification between the reservoir assessment method and logging data in the embodiments of this application;
[0058] Figure 4 This is a flowchart illustrating another implementation of the reservoir evaluation method in this application.
[0059] Figure 5 This is a structural block diagram of a reservoir evaluation device according to an embodiment of this application;
[0060] Figure 6 This is a structural block diagram of a reservoir evaluation device according to an embodiment of this application;
[0061] Figure 7 This is a schematic diagram of the specific structure of a reservoir evaluation device provided in this embodiment. Detailed Implementation
[0062] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0063] See Figure 1 , Figure 1 This is a flowchart illustrating one implementation of the reservoir evaluation method in this application. The method may include the following steps:
[0064] S101: Obtain drilling engineering data sets and initial gas logging total hydrocarbon data for each preset drilling depth within the preset drilling depth range.
[0065] Gas logging total hydrocarbon data can indicate the oil content of a reservoir; the higher the oil content, the larger the gas logging total hydrocarbon data. Mechanical specific energy can indicate the reservoir's reservoir capacity and compressibility; the better the reservoir capacity and compressibility, the smaller the mechanical specific energy. A pre-set drilling depth range for reservoir assessment is established, and multiple drilling depths are pre-selected within this range. Drilling engineering data sets and initial gas logging total hydrocarbon data for each pre-set drilling depth within the pre-set drilling depth range are then obtained.
[0066] Drilling engineering data sets may include drilling pressure (DP) ), drill bit area ( ), turntable speed ( ), Drill bit diameter ( ), drilling speed ( ), downhole power drill rotation speed ( ).
[0067] S102: Calculate the initial mechanical specific energy corresponding to each preset drilling depth based on each drilling engineering data set.
[0068] After obtaining the drilling engineering data sets for each preset drilling depth, the initial mechanical specific energy corresponding to each preset drilling depth is calculated based on each drilling engineering data set.
[0069] Mechanical specific energy (MSE) is defined as the mechanical work done to remove a unit volume of rock. Originally, MSE represented the energy required to break a certain volume of rock and was used to measure rock breaking efficiency. If the drill bit efficiency is 100%, then MSE is equal to the compressive strength of the rock.
[0070] In one specific embodiment of this application, step S102 may include the following steps:
[0071] The initial mechanical specific energy corresponding to each preset drilling depth is calculated using the formula based on each set of drilling engineering data:
[0072] ;
[0073] in, The initial mechanical specific energy, For drilling pressure, The drill bit area, The rotational speed of the turntable. For downhole power drilling tool speed, The diameter of the drill bit. This represents the drilling speed.
[0074] See Figure 2 , Figure 2 This is a curve showing the variation of mechanical specific energy with well depth, obtained based on existing mechanical specific energy calculation formulas and the mechanical specific energy calculation formula of this application. This curve is used when obtaining data including drilling pressure (…). ), drill bit area ( ), turntable speed ( ), Drill bit diameter ( ), drilling speed ( ), downhole power drill rotation speed ( After obtaining the drilling data sets for each well, the initial mechanical specific energy is calculated using the above formula. During directional drilling, the rotary table needs to be stopped to ensure the drill bit's orientation, resulting in a rotary table speed of 0. Without considering the downhole power drill bit (screw) speed, the mechanical specific energy cannot be effectively calculated. By fully considering the impact of the downhole power drill bit speed on the mechanical specific energy, the existing mechanical specific energy calculation formula has been revised to make it more suitable for use under current drilling technology conditions, thus achieving effective calculation of the mechanical specific energy.
[0075] like Figure 2 As shown, within the depth range of 7540m-7760m, the drilling power comes from the downhole power drill string. At this depth, the rotary table speed is 0 (N=0). If the mechanical specific energy is calculated without considering the downhole power drill string (screw) speed, the calculated result is close to 0 and cannot represent the true mechanical specific energy, thus lacking evaluative significance. However, the calculation using the formula in the embodiment of this application can represent the true mechanical specific energy and has evaluative significance. More importantly, when this formation is a high-yield oil and gas section, if reservoir assessment is not carried out in a timely and effective manner, the losses will be severe.
[0076] S103: Normalize each initial mechanical specific energy to obtain each normalized mechanical specific energy.
[0077] After calculating the initial mechanical specific energy corresponding to each preset drilling depth, the initial mechanical specific energy is normalized to obtain the normalized mechanical specific energy.
[0078] In one specific embodiment of this application, step S103 may include the following steps:
[0079] The initial mechanical specific energy was normalized using the formula to obtain the normalized mechanical specific energy:
[0080] ;
[0081] in, To normalize the mechanical specific energy, The initial mechanical specific energy, It is the minimum value among all initial mechanical specific energies. This represents the maximum value among the initial mechanical specific energies.
[0082] After calculating the initial mechanical specific energy corresponding to each preset drilling depth, the initial mechanical specific energy is normalized using the above formula, which improves the numerical stability of each initial mechanical specific energy and enhances the accuracy of reservoir assessment.
[0083] S104: Normalize each initial total hydrocarbon data to obtain normalized total hydrocarbon data.
[0084] After obtaining the initial total hydrocarbon data, the initial total hydrocarbon data were normalized to obtain the normalized total hydrocarbon data.
[0085] In one specific embodiment of this application, step S104 may include the following steps:
[0086] The initial total hydrocarbon data were normalized using the formula to obtain the normalized total hydrocarbon data:
[0087] ;
[0088] in, For normalized gas analysis of total hydrocarbon data, This is the initial total hydrocarbon data from gas analysis. This is the minimum value among the initial total hydrocarbon data. This represents the maximum value among the initial total hydrocarbon data.
[0089] After obtaining the initial total hydrocarbon data, the data were normalized using the formula described above, which improved the numerical stability of the initial total hydrocarbon data and increased the accuracy of reservoir assessment.
[0090] S105: Reservoir assessment is performed on the preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical energy.
[0091] After obtaining the normalized total hydrocarbon data and normalized mechanical energy, reservoir assessment is performed on the preset drilling depth range based on these data, such as for carbonate reservoirs. By analyzing the intrinsic relationship between mechanical energy and total hydrocarbon data, reservoir assessment can be performed during drilling, improving assessment efficiency, reducing reliance on logging instruments, and lowering costs.
[0092] In one specific embodiment of this application, step S105 may include the following steps:
[0093] Step 1: Calculate the initial reservoir effectiveness index corresponding to each preset drilling depth using the formula based on the normalized total hydrocarbon data and the normalized mechanical energy.
[0094] ;
[0095] in, This is the initial reservoir effectiveness index. For normalized gas analysis of total hydrocarbon data, Normalized mechanical specific energy;
[0096] Step 2: Normalize each initial reservoir effectiveness index using the formula to obtain the normalized reservoir effectiveness index:
[0097] ;
[0098] in, The normalized reservoir effectiveness index, This is the initial reservoir effectiveness index. It is the minimum value among the initial reservoir effectiveness indices. This is the maximum value among the initial reservoir effectiveness indices;
[0099] Step 3: Evaluate the reservoir effectiveness of the preset drilling depth based on each normalized reservoir effectiveness index.
[0100] For ease of description, the three steps above can be combined for explanation.
[0101] By calculating the ratio between normalized total hydrocarbon data and normalized specific energy, initial reservoir effectiveness indices are obtained for each preset drilling depth. These initial indices are then normalized using a formula to obtain normalized reservoir effectiveness indices. Reservoir effectiveness is then assessed for each preset drilling depth based on these normalized indices; a higher normalized reservoir effectiveness index indicates better reservoir effectiveness. This method of assessing reservoir effectiveness at preset drilling depths by using the calculated normalized reservoir effectiveness indices fully leverages the intrinsic relationship between specific energy and total hydrocarbon data, enabling rapid reservoir assessment at corresponding drilling depths during the drilling process.
[0102] As can be seen from the above technical solution, by pre-selecting drilling depth sections, initial total hydrocarbon data and drilling engineering data are acquired in real time and continuously during the drilling process. Based on each set of drilling engineering data, the initial mechanical specific energy corresponding to each preset drilling depth is calculated. Then, each initial total hydrocarbon data and each initial mechanical specific energy are normalized to obtain normalized mechanical specific energy and normalized total hydrocarbon data. By analyzing the intrinsic relationship between mechanical specific energy and total hydrocarbon data, reservoir assessment is performed on the preset drilling depth sections based on the normalized total hydrocarbon data and normalized mechanical specific energy. This achieves reservoir assessment during the drilling process, improves reservoir assessment efficiency, reduces reliance on logging instruments, and lowers costs.
[0103] It should be noted that, based on the above embodiments, this application also provides corresponding improvement solutions. In subsequent embodiments, steps that are the same as or corresponding to those in the above embodiments can be referred to each other, and the corresponding beneficial effects can also be referred to each other. These improvements will not be elaborated upon in the following improved embodiments.
[0104] In one specific embodiment of this application, after step S105, the method may further include the following steps:
[0105] Step 1: Obtain logging data and initial reservoir assessment results;
[0106] Step 2: Determine the target reservoir assessment results based on the initial reservoir assessment results and logging data.
[0107] For ease of description, the two steps above can be combined for explanation.
[0108] After conducting reservoir assessments at predetermined drilling depths based on normalized total hydrocarbon data and normalized specific energy, and obtaining initial reservoir assessment results, logging data including acoustic transit time (AC), resistivity (RD), and relative stability (RS) are acquired, along with the initial reservoir assessment results. Based on these initial assessment results and logging data, the target reservoir assessment results are determined. Higher AC and lower RD and RS values indicate more developed fractures and a better reservoir. By comparing the initial reservoir assessment results with the displayed logging data, the scientific validity and accuracy of reservoir assessments combining total hydrocarbon data and specific energy are verified.
[0109] See Figure 3 , Figure 3 This diagram illustrates the mutual verification between the reservoir assessment method and logging data in the embodiments of this application. For carbonate reservoirs, the oil-bearing capacity, compressibility, and reservoir properties are mainly positively correlated with the degree of fracture development. Commonly used evaluation methods are primarily based on logging parameters, i.e., the larger the sonic transit time AC and the smaller the resistivity RD and RS, the more developed the fractures and the better the reservoir. Figure 3 The depth segments marked by the square brackets represent well-developed reservoir segments. It can be seen that these are primarily segments with high reservoir effectiveness indices, and also segments with large acoustic transit times (AC) and low resistivity (RD) and resistivity (RS). This verifies the effectiveness and accuracy of the reservoir assessment method in the embodiments of this application.
[0110] See Figure 4 , Figure 4 This is another implementation flowchart of the reservoir evaluation method in this application, which may include the following steps:
[0111] S401: Acquire drilling engineering data sets and initial gas logging total hydrocarbon data for each preset drilling depth within the preset drilling depth range.
[0112] S402: Calculate the initial mechanical specific energy corresponding to each preset drilling depth based on each drilling engineering data set.
[0113] S403: Normalize each initial mechanical specific energy to obtain each normalized mechanical specific energy.
[0114] S404: Normalize each initial total hydrocarbon data to obtain normalized total hydrocarbon data.
[0115] S405: Generate a gas-based total hydrocarbon curve based on the normalized total hydrocarbon data.
[0116] After obtaining the normalized total hydrocarbon data, a total hydrocarbon curve is generated based on the normalized total hydrocarbon data. For example, the normalized total hydrocarbon data corresponding to each preset drilling depth can be connected in a two-dimensional coordinate system composed of well depth and normalized total hydrocarbon data to generate a total hydrocarbon curve.
[0117] S406: Generate mechanical specific energy curves based on each normalized mechanical specific energy.
[0118] After obtaining each normalized mechanical specific energy, a mechanical specific energy curve is generated based on each normalized mechanical specific energy. For example, in a two-dimensional coordinate system composed of well depth and normalized mechanical specific energy, the normalized mechanical specific energy corresponding to each preset drilling depth is connected to generate a mechanical specific energy curve.
[0119] S407: Determine the intersection area of the gas-based total hydrocarbon curve and the mechanical specific energy curve by means of the intersection method of the gas-based total hydrocarbon curve and the mechanical specific energy curve.
[0120] After generating the total hydrocarbon curve and the mechanical specific energy curve, the intersection area of the total hydrocarbon curve and the mechanical specific energy curve is determined by the intersection method. The normalized total hydrocarbon data must be greater than the normalized mechanical specific energy.
[0121] S408: Reservoir assessment of the preset drilling depth based on the intersection area.
[0122] After determining the intersection area of the total hydrocarbon curve and the mechanical energy curve, reservoir assessment is performed at the preset drilling depth based on the intersection area. The larger the intersection area, the better the reservoir effectiveness, enabling rapid reservoir assessment.
[0123] Corresponding to the above method embodiments, this application also provides a reservoir evaluation apparatus, and the reservoir evaluation apparatus described below can be referred to in correspondence with the reservoir evaluation method described above.
[0124] See Figure 5 , Figure 5 This is a structural block diagram of a reservoir evaluation device according to an embodiment of this application. The device may include:
[0125] Data acquisition module 51 is used to acquire drilling engineering data sets and initial gas logging total hydrocarbon data for each preset drilling depth within a preset drilling depth range;
[0126] The initial mechanical energy calculation module 52 is used to calculate the initial mechanical energy corresponding to each preset drilling depth based on each drilling engineering data set;
[0127] The mechanical specific energy normalization module 53 is used to normalize each initial mechanical specific energy to obtain each normalized mechanical specific energy;
[0128] Gas measurement full hydrocarbon normalization module 54 is used to normalize each initial gas measurement full hydrocarbon data to obtain each normalized gas measurement full hydrocarbon data;
[0129] The reservoir assessment module 55 is used to assess the reservoir at a preset drilling depth based on normalized total hydrocarbon data and normalized mechanical energy.
[0130] As can be seen from the above technical solution, by pre-selecting drilling depth sections, initial total hydrocarbon data and drilling engineering data are acquired in real time and continuously during the drilling process. Based on each set of drilling engineering data, the initial mechanical specific energy corresponding to each preset drilling depth is calculated. Then, each initial total hydrocarbon data and each initial mechanical specific energy are normalized to obtain normalized mechanical specific energy and normalized total hydrocarbon data. By analyzing the intrinsic relationship between mechanical specific energy and total hydrocarbon data, reservoir assessment is performed on the preset drilling depth sections based on the normalized total hydrocarbon data and normalized mechanical specific energy. This achieves reservoir assessment during the drilling process, improves reservoir assessment efficiency, reduces reliance on logging instruments, and lowers costs.
[0131] In one specific embodiment of this application, the reservoir evaluation module 55 includes:
[0132] The gas analysis full hydrocarbon curve generation submodule is used to generate gas analysis full hydrocarbon curves based on each normalized gas analysis full hydrocarbon data.
[0133] The mechanical specific energy curve generation submodule is used to generate mechanical specific energy curves based on each normalized mechanical specific energy.
[0134] The intersection area determination submodule is used to determine the intersection area of the gas-measured total hydrocarbon curve and the mechanical specific energy curve by means of the intersection method of the gas-measured total hydrocarbon curve and the mechanical specific energy curve.
[0135] The first reservoir assessment submodule is used to assess reservoirs at preset drilling depths based on the intersection area.
[0136] In one specific embodiment of this application, the initial mechanical specific energy calculation module 52 is specifically used to calculate the initial mechanical specific energy corresponding to each preset drilling depth according to each drilling engineering data set using a formula:
[0137] ;
[0138] in, The initial mechanical specific energy, For drilling pressure, The drill bit area, The rotational speed of the turntable. For downhole power drilling tool speed, The diameter of the drill bit. This represents the drilling speed.
[0139] In one specific embodiment of this application, the mechanical specific energy normalization module is specifically used to normalize each initial mechanical specific energy using a formula to obtain each normalized mechanical specific energy:
[0140] ;
[0141] in, To normalize the mechanical specific energy, The initial mechanical specific energy, It is the minimum value among all initial mechanical specific energies. This represents the maximum value among the initial mechanical specific energies.
[0142] In one specific embodiment of this application, the gas chromatography-mass normalization module 54 is specifically used to normalize each initial gas chromatography-mass data using a formula to obtain normalized gas chromatography-mass data:
[0143] ;
[0144] in, For normalized gas analysis of total hydrocarbon data, This is the initial total hydrocarbon data from gas analysis. This is the minimum value among the initial total hydrocarbon data. This represents the maximum value among the initial total hydrocarbon data.
[0145] In one specific embodiment of this application, the reservoir evaluation module 45 includes:
[0146] The initial effectiveness index calculation submodule is used to calculate the initial reservoir effectiveness index corresponding to each preset drilling depth based on the normalized total hydrocarbon data and the normalized mechanical specific energy using the following formula:
[0147] ;
[0148] in, This is the initial reservoir effectiveness index. For normalized gas analysis of total hydrocarbon data, Normalized mechanical specific energy;
[0149] The normalized effectiveness index calculation submodule is used to normalize each initial reservoir effectiveness index using a formula to obtain the normalized reservoir effectiveness index:
[0150] ;
[0151] in, The normalized reservoir effectiveness index, This is the initial reservoir effectiveness index. It is the minimum value among the initial reservoir effectiveness indices. This is the maximum value among the initial reservoir effectiveness indices;
[0152] The second reservoir assessment submodule is used to assess the reservoir effectiveness of a preset drilling depth based on each normalized reservoir effectiveness index.
[0153] In one specific embodiment of this application, the device may further include:
[0154] The initial reservoir assessment result acquisition module is used to acquire logging data and the initial reservoir assessment results obtained after assessing the reservoir at a preset drilling depth based on normalized total hydrocarbon data and normalized mechanical energy.
[0155] The target reservoir assessment result acquisition module is used to determine the target reservoir assessment result based on the initial reservoir assessment result and logging data.
[0156] For the method embodiments described above, see [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic diagram of the reservoir evaluation equipment provided in this application, which may include:
[0157] Memory 332 is used to store computer programs;
[0158] The processor 322 is used to implement the steps of the reservoir evaluation method in the above method embodiments when executing a computer program.
[0159] For details, please refer to Figure 7 , Figure 7 This is a schematic diagram illustrating the specific structure of a reservoir evaluation device provided in this embodiment. The reservoir evaluation device can vary significantly due to differences in configuration or performance. It may include a processor (central processing unit, CPU) 322 (e.g., one or more processors) and a memory 332. The memory 332 stores one or more computer programs 342 or data 344. The memory 332 can be temporary or permanent storage. The program stored in the memory 332 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the data processing device. Furthermore, the processor 322 may be configured to communicate with the memory 332 and execute the series of instruction operations stored in the memory 332 on the reservoir evaluation device 301.
[0160] The reservoir evaluation device 301 may also include one or more power supplies 326, one or more wired or wireless network interfaces 350, one or more input / output interfaces 358, and / or one or more operating systems 341.
[0161] The steps in the reservoir assessment method described above can be implemented by the structure of the reservoir assessment equipment.
[0162] Corresponding to the above method embodiments, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the following steps:
[0163] Obtain drilling engineering data sets and initial total hydrocarbon data for each preset drilling depth within the preset drilling depth range; calculate the initial mechanical specific energy corresponding to each preset drilling depth based on each drilling engineering data set; normalize each initial mechanical specific energy to obtain normalized mechanical specific energy; normalize each initial total hydrocarbon data to obtain normalized total hydrocarbon data; perform reservoir assessment for the preset drilling depth range based on each normalized total hydrocarbon data and each normalized mechanical specific energy.
[0164] The computer-readable storage medium may include various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0165] For a description of the computer-readable storage medium provided in this application, please refer to the above method embodiments; further details will not be repeated here.
[0166] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatuses, devices, and computer-readable storage media disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.
[0167] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.
Claims
1. A method of reservoir evaluation, characterized by, The method comprises the following steps: obtaining drilling engineering data groups and initial gas logging total hydrocarbon data of each preset drilling depth in a preset drilling depth section; calculating initial mechanical specific energy corresponding to each preset drilling depth according to each drilling engineering data group; normalizing each initial mechanical specific energy to obtain normalized mechanical specific energy; normalizing each initial gas logging total hydrocarbon data to obtain normalized gas logging total hydrocarbon data; evaluating the reservoir of the preset drilling depth section according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy.
2. The reservoir evaluation method of claim 1, wherein, The reservoir evaluation of the preset drilling depth section according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy comprises: generating a gas logging total hydrocarbon curve according to each normalized gas logging total hydrocarbon data; generating a mechanical specific energy curve according to each normalized mechanical specific energy; determining the intersection area of the gas logging total hydrocarbon curve and the mechanical specific energy curve by the intersection method of the gas logging total hydrocarbon curve and the mechanical specific energy curve; evaluating the reservoir of the preset drilling depth section according to the intersection area.
3. The reservoir evaluation method of claim 1, wherein, The method for calculating initial mechanical specific energy corresponding to each preset drilling depth according to each drilling engineering data group comprises: calculating initial mechanical specific energy corresponding to each preset drilling depth according to each drilling engineering data group by a formula: ； wherein, is the initial mechanical specific energy, is the weight on bit, is the bit area, is the rotary table speed, is the downhole motor speed, is the bit diameter, is the rate of penetration.
4. The reservoir evaluation method of claim 2, wherein, The method for normalizing each initial mechanical specific energy to obtain normalized mechanical specific energy comprises: normalizing each initial mechanical specific energy to obtain normalized mechanical specific energy by a formula: ； wherein, is the normalized mechanical specific energy, is the initial mechanical specific energy, is the minimum of the initial mechanical specific energies, is the maximum of the initial mechanical specific energies.
5. The reservoir evaluation method of claim 4, wherein, The method for normalizing each initial gas logging total hydrocarbon data to obtain normalized gas logging total hydrocarbon data comprises: normalizing each initial gas logging total hydrocarbon data to obtain normalized gas logging total hydrocarbon data by a formula: ； wherein, is normalized gas chromatograph total hydrocarbon data, is initial gas chromatograph total hydrocarbon data, is a minimum value among each of the initial gas chromatograph total hydrocarbon data, is a maximum value among each of the initial gas chromatograph total hydrocarbon data.
6. The reservoir evaluation method of claim 5, wherein, The method for evaluating the reservoir of the preset drilling depth section according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy comprises: calculating initial reservoir effectiveness indexes corresponding to each preset drilling depth according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy by a formula: ； wherein, is the initial reservoir effectiveness index, is the normalized gas log total hydrocarbon data, is the normalized mechanical specific energy; normalizing each initial reservoir effectiveness index to obtain normalized reservoir effectiveness indexes by a formula: ； wherein, is a normalized reservoir effectiveness index, is an initial reservoir effectiveness index, is a minimum of each of the initial reservoir effectiveness indices, is a maximum of each of the initial reservoir effectiveness indices; evaluating the reservoir effectiveness of the preset drilling depth section according to each normalized reservoir effectiveness index.
7. The reservoir evaluation method according to any one of claims 1 to 6, characterized in that, After the reservoir evaluation of the preset drilling depth section according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy, the method further comprises: obtaining logging data and an initial reservoir evaluation result obtained by evaluation; determining a target reservoir evaluation result according to the initial reservoir evaluation result and the logging data.
8. A reservoir evaluation apparatus characterized by, The method comprises the following steps: a data acquisition module for obtaining drilling engineering data groups and initial gas logging total hydrocarbon data of each preset drilling depth in a preset drilling depth section; an initial mechanical specific energy calculation module for calculating initial mechanical specific energy corresponding to each preset drilling depth according to each drilling engineering data group; a mechanical specific energy normalization module for normalizing each initial mechanical specific energy to obtain normalized mechanical specific energy; a normalization module for normalizing each initial gas logging total hydrocarbon data to obtain normalized gas logging total hydrocarbon data; a gas logging total hydrocarbon normalization module configured to normalize each of the initial gas logging total hydrocarbon data to obtain normalized gas logging total hydrocarbon data; a reservoir evaluation module configured to evaluate a reservoir of the preset drilling depth section according to the normalized gas logging total hydrocarbon data and the normalized mechanical specific energy.
9. A reservoir evaluation apparatus characterized by, comprising: a memory configured to store a computer program; a processor configured to implement the steps of the reservoir evaluation method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the reservoir evaluation method according to any one of claims 1 to 7.