A method for converting dynamic and static rock mechanics parameters in well logging and related equipment

Abstract

The application discloses a well logging rock mechanics parameter dynamic-static conversion method and related equipment, and considers the above-mentioned lithology influence, and proposes a technical method for improving the dynamic-static conversion precision of well logging rock mechanics parameters without increasing additional experiments and establishing complex parameter formulas. First, a lithology index Lit curve is created for a logging curve reflecting lithology information; the lithology index Lit curve is used as a coefficient, and is multiplied by dynamic-static rock mechanics parameters to obtain corrected rock mechanics parameters; then, the dynamic-static rock mechanics parameters are fitted to obtain a fitting formula, and the formula with the highest fitting degree is selected to calculate the static rock mechanics parameter values of a whole well section, and then the static rock mechanics parameter values are divided by the lithology index to restore the lithology, so that the static rock mechanics parameters of the whole well section are obtained. The method steps are clear, the operability and fitting degree are high, the result is controllable, no additional device and experiment work are needed, and time and cost are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of petroleum engineering, and in particular relates to a method for converting dynamic and static parameters of well logging rock mechanics parameters and related equipment. Background Art

[0002] With the large-scale development of unconventional oil and gas, the model of horizontal wells + large-scale hydraulic fracturing has achieved a breakthrough in production. Since unconventional oil and gas declines rapidly and fracturing costs are expensive, refined fracturing and optimized fracturing scale are becoming increasingly important.

[0003] The actual rock mechanical parameters of the sweet spots in unconventional oil reservoirs, such as Young's modulus, Poisson's ratio, and brittleness index, are of great significance for fracturing design. If dipole acoustic logging is available, direct fitting can be performed using the dipole acoustic P- and S-wave data. However, the relationship is often found to be rather chaotic, making it difficult to fit an effective P- and S-wave relationship. In addition, lithology has a significant influence on P- and S-wave velocities, so the influence of lithology must be taken into account when interpreting rock mechanical parameters.

[0004] Different lithologies, such as shale, sandstone, limestone, and volcanic rock, are affected by the speed of sound waves, resulting in significantly different calculated elastic moduli. Even for the same lithology, different temperature, pressure, and mineral content can lead to significant variations in the results obtained. Therefore, the results obtained do not always correlate well. For example, in sandstone reservoirs, differences in rock grain size, argillaceous content, and brittle mineral content lead to significant variations in Young's modulus and Poisson's ratio. Therefore, lithology significantly influences rock mechanical parameters. This requires calibrating a single-well rock mechanical parameter logging interpretation model with test results to derive dynamic-static conversion formulas, reduce errors in this conversion, and thus improve interpretation reliability.

[0005] To date, two common methods for determining rock mechanical parameters are dynamic and static. The geomechanical properties obtained by converting the propagation velocity of ultrasonic waves in rock measured through well logging are called dynamic properties, while the mechanical properties obtained by deforming rock samples subjected to static loading in the laboratory are called static properties. Because well logging data offers high vertical resolution, good continuity, and economic reliability, establishing a reasonable correlation—that is, finding a reasonable conversion method between dynamic and static rock mechanical parameters—is key to accurately interpreting one-dimensional rock mechanics through well logging. The usual approach is to fit rock mechanical experiments on cores at corresponding depths with well logging data to derive dynamic and static fitting formulas, and then convert the dynamic rock mechanical parameters of a single well into static rock mechanical parameters. This method has some accuracy issues and cannot meet field requirements.

[0006] Previous researchers conducted experiments on limestone, granite, and sandstone, studying the relationship between dynamic and static elastic parameters and fitting dynamic-static conversion formulas. However, since the dynamic-static relationship between the experimentally derived dynamic and static elastic parameters was fitted through the intersection, the fit was often poor, and the converted static rock mechanical parameters could not meet actual field requirements. This situation is becoming increasingly common with the large-scale development of unconventional materials.

[0007] Rock mechanics experiments, through triaxial experiments and acoustic wave velocity experiments, obtain rock mechanical parameters under different lithologies. These parameters are more accurate than those calculated using well logging data. However, deviations in the fitting results are often found during dynamic and static fitting. Analysis shows that the influence of lithology is taken into account during rock mechanics experiments, while the influence of lithology is not fully considered when calculating rock mechanical parameters using well logging data. This leads to large differences between the static rock mechanical parameters obtained from the coring experiment and the dynamic rock mechanical parameters interpreted from the corresponding well logging data.

[0008] Previous studies have found that the relationship between rock density and dynamic and static mechanical parameters of different lithologies is better than porosity, and the correlation between rock density and Vp is better than Vs; the relationship between rock density, porosity or P-wave and S-wave velocities and Young's modulus is better than Poisson's ratio; dynamic Vp / Vs has a certain correlation with rock pores and physical properties, and Young's modulus, Poisson's ratio and density ρ are related through Vp and Vs. However, Vp and Vs have different velocities in different lithologic formations. Previous researchers have conducted a large number of experiments and studies to study the relationship between P-wave and S-wave velocities and lithology (Castagn et al. a1985, Han1986, Smith1987, Li Qingzhong1992, etc.), which confirmed that the P-wave velocity changes faster than the S-wave velocity with the change of lithology; the calculation of rock mechanical parameters using logging curves uses acoustic wave data, and the acoustic wave velocity varies with different lithology and density. The density is taken into account in the Vp calculation formula, which lacks parameter representation of the inverted lithologic characteristics. Therefore, the present invention introduces GR, LID, and RT, which reflect lithologic characteristics, to correct the rock mechanical parameters calculated by logging curves, which is called the lithologic index Lit.

[0009] In 2008, He Shunyi et al. studied the method of obtaining rock mechanical parameters based on conventional logging data, and believed that the GR, AC, LID curves and Young's modulus and Poisson's ratio can be used to establish a formula through regression. Summary of the Invention

[0010] The present invention provides a method for converting logging rock mechanical parameters into dynamic and static state and related equipment, which solves the problem that the influence of lithology is not fully considered when calculating rock mechanical parameters using logging data, resulting in a large difference between the static rock mechanical parameters obtained from coring experiments and the dynamic rock mechanical parameters interpreted from the corresponding logging data.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A method for converting dynamic and static parameters of well logging rock mechanics parameters, comprising:

[0013] Obtain static rock mechanical parameters of the core;

[0014] Obtain core depth information and corresponding logging curve information based on static rock mechanics parameters, and create a lithology index Lit curve;

[0015] Obtain dynamic rock mechanical parameters of the core;

[0016] The corrected static rock mechanical parameters are obtained based on the static rock mechanical parameters and the lithology index Lit curve, and the corrected dynamic rock mechanical parameters are obtained based on the dynamic rock mechanical parameters and the lithology index Lit curve;

[0017] Calculate the static rock mechanical parameters of the entire well section based on the corrected static rock mechanical parameters and the corrected dynamic rock mechanical parameters;

[0018] The obtained static rock mechanical parameters of the entire well section are divided by the corresponding lithology index Lit to obtain the static rock mechanical parameters after lithology reduction.

[0019] Preferably, the static rock mechanical parameters of the core are obtained according to core experiments.

[0020] Preferably, the corrected static rock mechanical parameters are obtained by multiplying the static rock mechanical parameters by the lithology index Lit curve at the same depth;

[0021] Corrected dynamic rock mechanics parameters: The dynamic rock mechanics parameters are also multiplied by the lithology index Lit curve at the same depth.

[0022] Preferably, the dynamic rock mechanical parameters of the core are obtained according to a regional model or empirical formula.

[0023] Preferably, the method for calculating the static rock mechanical parameters of the entire well section is specifically as follows: fitting the static rock force parameters corrected by the lithology index Lit obtained from the core experiment with the dynamic rock mechanical parameters corrected by the lithology index Lit obtained from the corresponding depth logging, selecting the type with the highest fitting degree as the fitting formula used to fit the rock mechanical parameters of the entire well section, and calculating the static rock mechanical parameters of the entire well section.

[0024] Preferably, the lithologic index Lit curve includes a Lit_GR curve, a Lit_LID curve and a Lit_RT curve.

[0025] Preferably, the lithology index Lit curve formula is:

[0026]

[0027] Where X is the logging curve value closely related to lithology; Lit (log) is the lithology index.

[0028] A dynamic-static conversion system for well logging rock mechanical parameters, comprising:

[0029] Static parameter acquisition module: obtains the static rock mechanical parameters of the core;

[0030] Lit curve acquisition module: obtains core depth information and logging curve information corresponding to the core depth information based on static rock mechanics parameters, and creates the lithology index Lit curve;

[0031] Dynamic parameter acquisition module: obtain dynamic rock mechanical parameters of the core;

[0032] Correction module: obtains corrected static rock mechanical parameters based on static rock mechanical parameters and lithologic index Lit curve, and obtains corrected dynamic rock mechanical parameters based on dynamic rock mechanical parameters and lithologic index Lit curve;

[0033] Full well section calculation module: Calculates the static rock mechanical parameters of the full well section based on the corrected static rock mechanical parameters and the corrected dynamic rock mechanical parameters;

[0034] Conversion module: Divide the obtained static rock mechanical parameters of the entire well section by the corresponding lithology index Lit to obtain the static rock mechanical parameters after lithology reduction.

[0035] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for converting dynamic and static parameters of well logging rock mechanics parameters are implemented.

[0036] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for converting dynamic and static parameters of well logging rock mechanics parameters.

[0037] Compared with the prior art, the present invention has the following advantages: It provides a method and related equipment for converting logging rock mechanical parameters from dynamic to static. Due to different lithologies, the static rock mechanical parameters obtained experimentally and the dynamic rock mechanical parameters interpreted from logging have large differences in fitting accuracy, resulting in low dynamic-static conversion accuracy. To address field needs, the common approach is to firstly perform dynamic-static conversion by performing multiple sets of experimental data, which requires long experimental time and high costs, and also relies on experimental accuracy. Secondly, the method relies on and considers multiple sets of parameters, establishes cumbersome formula derivations and combinations, and is difficult to calculate quickly. Taking into account the above-mentioned lithologic influences, the present invention proposes a technical method for improving the accuracy of dynamic-static conversion of logging rock mechanical parameters without requiring additional experiments or complex parameter formulas. First, a lithologic index Lit curve is created for the logging curve reflecting lithologic information. The lithologic index Lit curve is used as a coefficient to obtain corrected rock mechanical parameters. Then, the static rock mechanical parameters for the entire well section are calculated based on the corrected dynamic and static rock mechanical parameters. The lithologic index is then divided by the lithologic index to restore the lithologic properties, thereby obtaining the static rock mechanical parameters for the entire well section. The method has clear steps, high operability and fitting degree, and controllable results. It does not require additional equipment and experimental work, thus saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a flow chart of a method for converting dynamic and static parameters of well logging rock mechanics parameters according to the present invention;

[0039] Figure 2 This is a block diagram of a dynamic-static conversion system for well logging rock mechanical parameters according to the present invention;

[0040] Figure 3 This is a fitted diagram of the static Young's modulus Lit(RT) after correction according to an embodiment of the present invention;

[0041] Figure 4 This is a fitted diagram of the corrected dynamic and static Young's modulus Lit(GR) of an embodiment of the present invention;

[0042] Figure 5 This is a direct fitting diagram of the static Young's modulus and the dynamic Young's modulus of the well logging experiment in the embodiment of the present invention. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] Limited by the number of coring wells and the number of coring and experimental costs, it is generally difficult to obtain the static rock mechanics parameters of the entire target layer of a single well obtained by experiments, and therefore the rock mechanics data interpreted from logging data becomes very important. How to control the quality of the model interpreted from logging and improve the accuracy of interpretation involves calibrating the rock mechanics data obtained from experiments and logging and converting the dynamic and static data, so as to obtain an interpretation model applicable to the entire well section or the entire region, and therefore the present application considers the influence of reservoir lithology, eliminates the lithology influence before fitting, restores the lithology after fitting, thereby improving the accuracy of dynamic and static conversion and improving the accuracy of rock mechanics interpretation from logging.

[0050] As Figure 1 shown, the present application provides a method for converting dynamic and static rock mechanics parameters from logging, comprising:

[0051] S101 obtaining static rock mechanics parameters of the core;

[0052] S102 obtaining core depth information and logging curve information corresponding to the core depth information according to the static rock mechanics parameters, and creating a lithology index Lit curve;

[0053] S103 obtaining dynamic rock mechanics parameters of the core;

[0054] S104 obtaining corrected static rock mechanics parameters according to the static rock mechanics parameters and the lithology index Lit curve, and obtaining corrected dynamic rock mechanics parameters according to the dynamic rock mechanics parameters and the lithology index Lit curve;

[0055] S105 calculating the static rock mechanics parameters of the entire well section according to the corrected static rock mechanics parameters and the corrected dynamic rock mechanics parameters;

[0056] S106 dividing the obtained static rock mechanics parameters of the entire well section by the corresponding lithology index Lit to obtain the static rock mechanics parameters after restoring the lithology.

[0057] The static rock mechanics parameters of the core are obtained according to core experiments.

[0058] The corrected static rock mechanics parameters are obtained by multiplying the static rock mechanics parameters by the lithology index Lit curve at the same depth.

[0059] The corrected dynamic rock mechanics parameters are obtained by multiplying the dynamic rock mechanics parameters by the lithology index Lit curve at the same depth.

[0060] The dynamic rock mechanics parameters of the core are obtained according to a regional model or an empirical formula.

[0061] The specific calculation method of the static rock mechanical parameters of the entire well section is as follows: the static rock force parameters corrected by the lithology index Lit obtained from the core experiment are fitted with the dynamic rock mechanical parameters corrected by the lithology index Lit obtained from the corresponding depth logging. The type with the highest fitting degree is selected as the fitting formula used to fit the rock mechanical parameters of the entire well section, and the static rock mechanical parameters of the entire well section are calculated.

[0062] The lithologic index Lit curve includes a Lit_GR curve, a Lit_LID curve, and a Lit_RT curve.

[0063] The lithology index Lit curve formula is:

[0064]

[0065] Where X is the logging curve value closely related to lithology; Lit (log) is the lithology index.

[0066] Another embodiment of the present invention provides a dynamic and static method for logging rock mechanics parameters, which can improve the conversion accuracy, specifically involving unconventional rock mechanics experiments and logging rock mechanics interpretation. The rock mechanics data obtained from the experiment and logging are mainly multiplied by the lithology index Lit curve reflecting the lithology information to improve the fitting accuracy, and then dynamic and static conversion is performed to obtain an interpretation model suitable for the entire well section or the entire area, solving the problem that the difference between the dynamic rock mechanics and static rock mechanics results of logging interpretation is too large and does not conform to the actual underground situation. To achieve the above purpose, the present application provides a dynamic and static conversion method for logging rock mechanics parameters, which includes:

[0067] The first step is to measure the static rock mechanical parameters of the core based on the core experiment;

[0068] The second step is to select the logging curve reflecting the lithology information and create the lithology index Lit curve (such as Lit_GR, Lit_LID, Lit_RT, etc.) based on the core depth information and the corresponding logging curve information;

[0069] The formula of the lithology index Lit curve is as follows:

[0070]

[0071] Where X is the logging curve value (continuous depth value) closely related to lithology, such as GR / RT;

[0072] Lit (log), is the lithologic index, which is a continuous curve, dimensionless, and ranges from [0,1];

[0073] The third step is to calculate the dynamic rock mechanical parameters of the entire well section of a single well based on the regional model or empirical formula;

[0074] The fourth step is to multiply the static rock mechanical parameters obtained from the core test with the lithologic index Lit curve at the same depth (named as Lit_GR, Lit_LID, and Lit_RT corrected static rock mechanical parameters). The dynamic rock mechanical parameters calculated for the entire well section are also multiplied with the lithologic index Lit curve at the same depth (named as Lit_GR, Lit_LID, and Lit_RT corrected dynamic rock mechanical parameters).

[0075] The fifth step is to fit the static rock force parameters corrected by the lithologic index Lit obtained from the core experiment with the dynamic rock mechanical parameters corrected by the lithologic index Lit obtained from the corresponding depth logging. The type with the highest degree is selected as the fitting formula for fitting the rock mechanical parameters of the entire well section, and the static rock mechanical parameters of the entire well section are calculated.

[0076] In the sixth step, the obtained static rock mechanical parameters for the entire well section are divided by the corresponding lithologic index Lit to obtain the static rock mechanical parameters after lithology reduction. The entire conversion process is clear and highly operational, improving the accuracy and efficiency of dynamic-static conversion without adding additional equipment, thereby enhancing the accuracy of rock mechanical parameter calculations in unconventional reservoirs.

[0077] Another embodiment of the present invention provides a method for converting dynamic and static rock mechanical parameters of well logging.

[0078] The following uses a coring well in a certain area as an example to explain this method in detail, and provides specific application instructions on how to eliminate the influence of lithology and improve the accuracy of dynamic-static conversion:

[0079] The first step is to select a well where the target layer has been cored and conduct uniaxial and triaxial rock mechanics tests on the core samples, or select a well where the target layer has been cored.

[0080] The second step is to conduct quality control on the rock mechanics experiments to ensure that the experimental results are reasonable; determine the static rock mechanics parameters at the core sampling depth, such as static Young's modulus, static Poisson's ratio, static minimum horizontal principal stress, static maximum horizontal principal stress, etc.

[0081] The third step is to interpret the logging data at the core sampling depth according to the basic interpretation model to obtain dynamic rock mechanical parameters, such as static Young's modulus, static Poisson's ratio, static minimum horizontal principal stress, static maximum horizontal principal stress, etc.

[0082] The fourth step is to create lithologic index Lit curves (such as Lit(GR), Lit(LID), Lit(RT) and other curves) for the logging curves at the coring depth;

[0083] The formula of the lithology index Lit curve is as follows:

[0084]

[0085] in:

[0086] X, is the logging curve value (continuous depth value) closely related to lithology, such as GR / RT;

[0087] Lit (log), is the lithologic index, which is a continuous curve, dimensionless, and ranges from [0,1];

[0088] Step 5: The corrected static rock mechanics parameters are obtained by multiplying the static rock mechanics and lithology index Lit curves.

[0089] In the sixth step, similarly, the dynamic rock mechanical parameters at the coring depth are multiplied by the lithology index to obtain the corrected dynamic rock mechanical parameters, as shown in Tables 1 and 2.

[0090] Table 1 Schematic diagram of Lit(RT) correction for selected core experimental data and corresponding logging interpretation data (partial data) Table 2 Schematic diagram of Lit(GR) correction using selected core test data and corresponding logging interpretation data (partial data)

[0091]

[0092] The seventh step is to fit the corrected dynamic and static rock mechanics data in the table, select the type with the highest fitting degree as the fitting formula used to fit the rock mechanics parameters of the entire well section, and calculate the static rock mechanics parameters of the entire well section; Figure 3 、 Figure 4 、 Figure 5 As shown;

[0093] In the eighth step, the obtained static rock mechanical parameters of the entire well section are divided by the Lit lithology index to obtain the static rock mechanical parameters after lithology reduction.

[0094] As can be seen from the fitting diagram, the static rock mechanical parameters of the single well core experiment and the dynamic rock mechanical parameters of the corresponding logging depth have the highest fitting degree after Lit (RT) correction and normalization of the dynamic and static Young's modulus, which is better than directly fitting the experimental data and logging interpretation data. The static Young's modulus value of the entire well section (after Lit (RT) correction) can be obtained by using the fitting formula. The static Young's modulus value (after Lit (RT) correction) is divided by the Lit (RT) lithologic index corresponding to each depth point to obtain the static Young's modulus value of the entire well section. The dynamic and static conversion formula of the Young's modulus of this single well is y = 1.0398x - 0.1929 (R 2=0.9998). The Lit(GR) correction also satisfies the requirement. Here, the number of core experiments and lithology types need to be considered comprehensively.

[0095] Similarly, Poisson's ratio, maximum horizontal principal stress, and minimum horizontal principal stress can all undergo the same processing and obtain the corresponding conversion formula to obtain the most reasonable conversion formula and obtain the rock mechanics parameter values ​​of the entire well section.

[0096] like Figure 2 The present invention also provides a dynamic-static conversion system for logging rock mechanical parameters, comprising:

[0097] Static parameter acquisition module: obtains the static rock mechanical parameters of the core;

[0098] Lit curve acquisition module: obtains core depth information and logging curve information corresponding to the core depth information based on static rock mechanics parameters, and creates the lithology index Lit curve;

[0099] Dynamic parameter acquisition module: obtain dynamic rock mechanical parameters of the core;

[0100] Correction module: obtains corrected static rock mechanical parameters based on static rock mechanical parameters and lithologic index Lit curve, and obtains corrected dynamic rock mechanical parameters based on dynamic rock mechanical parameters and lithologic index Lit curve;

[0101] Full well section calculation module: Calculates the static rock mechanical parameters of the full well section based on the corrected static rock mechanical parameters and the corrected dynamic rock mechanical parameters;

[0102] Conversion module: Divide the obtained static rock mechanical parameters of the entire well section by the corresponding lithology index Lit to obtain the static rock mechanical parameters after lithology reduction.

[0103] An embodiment of the present invention provides a terminal device. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of each of the aforementioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in each of the aforementioned device embodiments are implemented.

[0104] The computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to accomplish the present invention.

[0105] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0106] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0107] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0108] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0109] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and are not restrictive. A person skilled in the art, guided by the description, may devise various forms without departing from the scope of protection of the claims of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A method for converting dynamic and static rock mechanical parameters of well logging, characterized in that: include: Obtain static rock mechanical parameters of the core; Obtain core depth information and corresponding logging curve information based on static rock mechanics parameters, and create a lithology index Lit curve; Obtain dynamic rock mechanical parameters of the core; The corrected static rock mechanical parameters are obtained based on the static rock mechanical parameters and the lithology index Lit curve, and the corrected dynamic rock mechanical parameters are obtained based on the dynamic rock mechanical parameters and the lithology index Lit curve; Calculate the static rock mechanical parameters of the entire well section based on the corrected static rock mechanical parameters and the corrected dynamic rock mechanical parameters; The obtained static rock mechanical parameters of the entire well section are divided by the corresponding lithology index Lit to obtain the static rock mechanical parameters after lithology reduction.

2. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The static rock mechanical parameters of the core are obtained based on core experiments.

3. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The corrected static rock mechanical parameters are obtained by multiplying the static rock mechanical parameters with the lithology index Lit curve at the same depth; Corrected dynamic rock mechanics parameters: The dynamic rock mechanics parameters are also multiplied by the lithology index Lit curve at the same depth.

4. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The dynamic rock mechanical parameters of the core are obtained based on regional models or empirical formulas.

5. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The specific calculation method of the static rock mechanical parameters of the entire well section is as follows: the static rock force parameters corrected by the lithology index Lit obtained from the core experiment are fitted with the dynamic rock mechanical parameters corrected by the lithology index Lit obtained from the corresponding depth logging. The type with the highest fitting degree is selected as the fitting formula used to fit the rock mechanical parameters of the entire well section, and the static rock mechanical parameters of the entire well section are calculated.

6. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The lithologic index Lit curve includes a Lit_GR curve, a Lit_LID curve, and a Lit_RT curve.

7. The method for dynamic-static conversion of well logging rock mechanical parameters according to claim 1, characterized in that: The lithology index Lit curve formula is: Where X is the logging curve value closely related to lithology; Lit (log) is the lithology index.

8. A dynamic-static conversion system for well logging rock mechanics parameters, characterized in that: include: Static parameter acquisition module: obtains the static rock mechanical parameters of the core; Lit curve acquisition module: obtains core depth information and logging curve information corresponding to the core depth information based on static rock mechanics parameters, and creates the lithology index Lit curve; Dynamic parameter acquisition module: obtain dynamic rock mechanical parameters of the core; Correction module: obtains corrected static rock mechanical parameters based on static rock mechanical parameters and lithologic index Lit curve, and obtains corrected dynamic rock mechanical parameters based on dynamic rock mechanical parameters and lithologic index Lit curve; Full well section calculation module: Calculates the static rock mechanical parameters of the full well section based on the corrected static rock mechanical parameters and the corrected dynamic rock mechanical parameters; Conversion module: Divide the obtained static rock mechanical parameters of the entire well section by the corresponding lithology index Lit to obtain the static rock mechanical parameters after lithology reduction.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for dynamic-static conversion of logging rock mechanical parameters as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for dynamic-static conversion of logging rock mechanical parameters as described in any one of claims 1 to 7 are implemented.

Images