Method and device for correcting hydrocarbon parameters and total organic carbon of rock debris, equipment and medium

Abstract

The invention relates to a method and device for correcting hydrocarbon parameters and total organic carbon of rock debris, equipment and a medium, and relates to the field of hydrocarbon source rock evaluation.The method comprises the steps that the free hydrocarbon content and the pyrolytic hydrocarbon content of drilling rock debris of a target oil well are compared with a logarithmic interaction chart, and polluted drilling rock debris is obtained; subtracting the real peak area of the saturated hydrocarbon chromatogram of the drilling cuttings from the area of the main peak carbon atoms and the base line of the organic matter saturated hydrocarbon chromatogram of the polluted drilling cuttings to obtain the pollution area; correcting the free hydrocarbon content of the drilling cuttings to obtain the corrected free hydrocarbon content; correcting the pyrolytic hydrocarbon content by adopting the corrected free hydrocarbon content to obtain a corrected pyrolytic hydrocarbon content; and correcting the total organic carbon by means of the corrected free hydrocarbon content and the corrected pyrolytic hydrocarbon content to obtain corrected total organic carbon. According to the correction method provided by the invention, the total organic carbon of the hydrocarbon source rock caused by the oil-based mud pollution can be rapidly and accurately deducted, and the correction of the pyrolysis parameter free hydrocarbon content and the pyrolysis hydrocarbon content parameter is realized.

Description

Technical Field

[0001] The present invention relates to the field of hydrocarbon source rock evaluation, and specifically to a method and device, equipment and medium for correcting hydrocarbon parameters and total organic carbon of rock cuttings, and in particular to a method and device, equipment and medium for correcting hydrocarbon parameters and total organic carbon of mudstone rock cuttings produced by oil-based mud drilling. Background Art

[0002] The pyrolysis results of organic matter in mudstone cuttings and total organic carbon (TOC) are important parameters for rapid evaluation of source rocks. However, due to the influence of drilling oil-based mud, the pyrolysis results of organic matter in mudstone cuttings and the total organic carbon content are significantly higher than those in core samples, resulting in distorted source rock evaluation results.

[0003] It is generally believed that the oil-based mud remaining in mudstone cuttings is the main cause of abnormal pyrolysis results and total organic carbon content. Physical and chemical oil washing correction methods are mainly used. However, the oil washing process takes a long time, and it is difficult to determine whether the oil-based mud is completely removed. There is a possibility of causing a large loss of organic matter in the cuttings, thereby underestimating the hydrocarbon generation potential of the hydrocarbon-generating rock.

[0004] At present, the correction methods for the pyrolysis results of organic matter and the total organic carbon TOC are all centered around the total organic carbon content data of organic matter and the data and spectral information of pyrolysis analysis. For example, CN118549622A discloses a correction method, device, equipment and medium for the total organic carbon content of drilling cuttings. The method comprises: obtaining the total organic carbon content of a core sample of a source rock in a standard drilling well and the total organic carbon content of at least two cuttings samples, wherein the cuttings samples are cuttings contaminated with oil-based mud; fitting a carbon content correction formula to be used based on the total organic carbon content of the core sample and the total organic carbon content of at least two cuttings samples, and obtaining a target carbon content correction formula after error detection of the carbon content correction formula to be used; and correcting the total organic carbon content of the cuttings sample of the source rock in the drilling well to be corrected by using the target carbon content correction formula to obtain the actual total organic carbon content of the cuttings sample of the source rock in the drilling well to be corrected.

[0005] However, the current correction process still has the defects of poor correction accuracy and low correction efficiency, which is not conducive to providing accurate results for subsequent rapid evaluation of source rocks. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method and device, equipment, and medium for correcting the hydrocarbon parameters and total organic carbon of rock cuttings, so as to solve the current defects of poor correction accuracy and low correction efficiency in the correction of hydrocarbon parameters and total organic carbon of mudstone cuttings from oil-based mud drilling, which is not conducive to providing accurate results for subsequent rapid evaluation of hydrocarbon source rocks.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a method for calibrating hydrocarbon parameters and total organic carbon of cuttings, the calibration method comprising:

[0009] Obtaining the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of uncontaminated drilling cuttings of a known oil well, and determining a logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2;

[0010] Comparing the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, to obtain the contaminated drilling cuttings in the target oil well;

[0011] The area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings is calculated, and the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram is obtained, and then the contamination area A3 of the drilling mud is obtained = A1-A2;

[0012] Correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain a corrected free hydrocarbon content S"1;

[0013] According to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well is corrected by using the corrected free hydrocarbon content S"1 to obtain the corrected pyrolysis hydrocarbon content S"2;

[0014] With the aid of the obtained corrected free hydrocarbon content S"1 and corrected pyrolysis hydrocarbon content S"2, the total organic carbon TOC is corrected according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

[0015] The correction method provided by the present invention is based on the distribution law of alkane compounds in saturated hydrocarbons of organic matter in oil-based mud and mudstone cuttings, combined with the change characteristics of the total organic carbon content and pyrolysis parameter values ​​of organic matter in oil-based mud and mudstone cuttings, and adopts data analysis and modeling methods to quantitatively complete the correction of total organic carbon TOC, pyrolysis parameter free hydrocarbon content, and pyrolysis hydrocarbon content parameters. This method can quickly and accurately deduct the correction of total organic carbon TOC, pyrolysis parameter free hydrocarbon content, and pyrolysis hydrocarbon content parameters of source rocks caused by oil-based mud pollution, provide accurate results for subsequent rapid evaluation of source rocks, and guide oil and gas exploration deployment.

[0016] As a preferred technical solution of the present invention, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well are compared with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, including: trend line fitting of the logarithmic scatter plot of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, and then selecting a distribution line with a confidence interval of 95% based on the trend line to form a convergence uncontaminated area. If the data points of the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings are located in the convergence uncontaminated area, it is determined to be uncontaminated, otherwise it is determined to be contaminated.

[0017] The goodness of fit R of the trend line obtained in the trend line fitting 2 ≥0.89.

[0018] As a preferred technical solution of the present invention, the main peak carbon atoms include: all carbon atoms detected in the saturated hydrocarbon chromatogram.

[0019] Preferably, the actual peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram comprises: adjusting the peak area of ​​C 14 , C 15 The peak height and C 13 Same, adjust C 16 , C 17 The peak height and C 18 The area of ​​all carbon atoms detected in the saturated hydrocarbon chromatogram and the baseline is then calculated.

[0020] As a preferred technical solution of the present invention, the calculation formula for correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well is as follows:

[0021] Corrected free hydrocarbon content S"1=free hydrocarbon content S'1-free hydrocarbon content S'1×α, α=A3 / A1.

[0022] As a preferred technical solution of the present invention, the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is obtained by fitting the logarithm of the free hydrocarbon content S'1 and the logarithm of the pyrolysis hydrocarbon content S'2.

[0023] As a preferred technical solution of the present invention, the function used for fitting includes: one of a linear function, an inverse function, a quadratic function or a cubic function, or a combination of at least two of them.

[0024] Preferably, the goodness of fit R of the fitted relationship is 2 ≥0.85.

[0025] As a preferred technical solution of the present invention, the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is as follows:

[0026] Total organic carbon TOC = 0.83 × (free hydrocarbon content S'1 + pyrolysis hydrocarbon content S'2) + residual carbon Rc.

[0027] In a second aspect, the present invention provides a calibration device for hydrocarbon parameters and total organic carbon of rock cuttings, the calibration device comprising:

[0028] A logarithmic interactive chart acquisition module is used to acquire the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of uncontaminated drilling cuttings of a known oil well, and determine the logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2;

[0029] A contaminated drilling cuttings acquisition module is used to compare the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 to obtain the contaminated drilling cuttings in the target oil well;

[0030] The drilling mud contamination area acquisition module is used to calculate the area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings, and obtain the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram, and then obtain the drilling mud contamination area A3 = A1-A2;

[0031] A module for obtaining a corrected free hydrocarbon content S"1 is used to correct the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain a corrected free hydrocarbon content S"1;

[0032] A module for obtaining a corrected pyrolysis hydrocarbon content S"2 is used to correct the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well using the corrected free hydrocarbon content S"1 according to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, so as to obtain a corrected pyrolysis hydrocarbon content S"2;

[0033] The corrected total organic carbon TOC' acquisition module is used to correct the total organic carbon TOC according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

[0034] In a third aspect, the present invention provides an electronic device, the electronic device comprising:

[0035] at least one processor; and a memory communicatively coupled to the at least one processor;

[0036] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the correction method for hydrocarbon parameters and total organic carbon of rock cuttings described in the first aspect.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by a processor, the method for correcting hydrocarbon parameters and total organic carbon of rock cuttings described in the first aspect is implemented.

[0038] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0039] (1) The correction method provided by the present invention is based on the distribution law of alkane compounds in the organic saturated hydrocarbons of oil-based mud and mudstone cuttings, combined with the change characteristics of the total organic carbon content and pyrolysis parameter values ​​of the organic matter of oil-based mud and mudstone cuttings, and uses the chromatogram information of the organic saturated hydrocarbons in the mudstone cuttings drilled by oil-based mud to quantitatively complete the correction of the total organic carbon TOC, pyrolysis parameter free hydrocarbon content, and pyrolysis hydrocarbon content parameters.

[0040] (2) This correction method can quickly and accurately deduct the total organic carbon (TOC) of source rocks caused by oil-based mud contamination, and correct the free hydrocarbon content and pyrolysis hydrocarbon content parameters of pyrolysis parameters, providing accurate results for subsequent rapid evaluation of source rocks and guiding oil and gas exploration deployment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of a method for correcting hydrocarbon parameters and total organic carbon of cuttings provided in an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of a calibration device for hydrocarbon parameters and total organic carbon of rock cuttings provided by an embodiment of the present invention;

[0043] Figure 3 is a schematic diagram of an electronic device provided by an embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of a logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 obtained in Example 1 of the present invention;

[0045] Figure 5 is a schematic diagram of comparing the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 in Example 1 of the present invention;

[0046] Figure 6 It is a baseline schematic diagram of the chromatogram of organic matter saturated hydrocarbons of the contaminated mudstone cuttings at 2836-2840 m in Well X-1 in Example 1 of the present invention;

[0047] Figure 7 It is a schematic diagram of the A1 value of the chromatogram of organic matter saturated hydrocarbons of the 2836-2840m mudstone cuttings of Well X-1 in Example 1 of the present invention;

[0048] Figure 8 This is a schematic diagram of the A2 value of the chromatogram of organic matter saturated hydrocarbons in the 2836-2840m mudstone cuttings of Well X-1 in Example 1 of the present invention;

[0049] Fig. 9 It is a model fitting diagram of the logarithm of the pyrolysis parameters S'1 and S'2 of the mudstone cuttings of a typical single well water-based mud in the X region in Example 1 of the present invention;

[0050] Fig.10 This is a univariate cubic function fitting diagram of the logarithm of the pyrolysis parameters S'1 and S'2 of the typical single-well water-based mud mudstone cuttings in the X region in Example 1 of the present invention.

[0051] In the figure: 100-logarithmic interactive chart acquisition module, 200-contaminated drilling cuttings acquisition module, 300-drilling mud contamination area acquisition module, 400-corrected free hydrocarbon content S"1 acquisition module, 500-corrected pyrolysis hydrocarbon content S"2 acquisition module, 600-corrected total organic carbon TOC' acquisition module;

[0052] 10 - electronic device, 11 - processor, 12 - ROM, 13 - RAM, 14 - bus, 15 - I / O interface, 16 - input unit, 17 - output unit, 18 - storage unit, 19 - communication unit.

[0053] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0054] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0055] This embodiment provides a method for calibrating hydrocarbon parameters and total organic carbon of cuttings, the process is as follows: Figure 1 As shown, the correction method includes:

[0056] Obtaining the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of uncontaminated drilling cuttings of a known oil well, and determining a logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2;

[0057] Comparing the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, to obtain the contaminated drilling cuttings in the target oil well;

[0058] The area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings is calculated, and the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram is obtained, and then the contamination area A3 of the drilling mud is obtained = A1-A2;

[0059] Correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain a corrected free hydrocarbon content S"1;

[0060] According to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well is corrected by using the corrected free hydrocarbon content S"1 to obtain the corrected pyrolysis hydrocarbon content S"2;

[0061] With the aid of the obtained corrected free hydrocarbon content S"1 and corrected pyrolysis hydrocarbon content S"2, the total organic carbon TOC is corrected according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

[0062] In the present invention, the uncontaminated drilling cuttings of known oil wells used in determining the logarithmic interactive chart of free hydrocarbon content S1 and pyrolysis hydrocarbon content S2 are preferably selected from at least 10 samples in the drilling depth direction to form the chart.

[0063] The method of comparing the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 includes: performing trend line fitting on the logarithmic scatter plot of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, and then selecting a distribution line with a confidence interval of 95% based on the trend line to form distribution lines located on both sides of the trend line, and the two distribution lines form an intersection uncontaminated area. If the data points of the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings are located in the intersection uncontaminated area, it is determined to be uncontaminated, otherwise it is determined to be contaminated.

[0064] Among them, the goodness of fit R of the trend line obtained in the trend line fitting is 2 ≥0.89.

[0065] In the present invention, in the calculation of the area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings and the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram, the baseline is obtained by connecting the position of the bottom of the carbon atom peak in the saturated hydrocarbon chromatogram into a smooth curve, and the specific baseline can be obtained according to the baseline acquisition requirements of the organic saturated hydrocarbon chromatogram.

[0066] Wherein, the main peak carbon atoms include: all carbon atoms detected in the saturated hydrocarbon chromatogram.

[0067] The actual peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram comprises: adjusting the peak area of ​​C 14 , C 15 The peak height and C 13 Same, adjust C 16 , C 17 The peak height and C 18 The area of ​​all carbon atoms detected in the saturated hydrocarbon chromatogram and the baseline is then calculated.

[0068] The calculation formula for correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well is as follows:

[0069] Corrected free hydrocarbon content S"1=free hydrocarbon content S'1-free hydrocarbon content S'1×α, α=A3 / A1.

[0070] The relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is obtained by fitting the logarithm of the free hydrocarbon content S'1 and the logarithm of the pyrolysis hydrocarbon content S'2.

[0071] The function used for fitting includes: one of a linear function, an inverse function, a quadratic function or a cubic function, or a combination of at least two of them.

[0072] Among them, the goodness of fit R of the fitted relationship is 2 ≥0.85.

[0073] The relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is as follows:

[0074] Total organic carbon TOC = 0.83 × (free hydrocarbon content S'1 + pyrolysis hydrocarbon content S'2) + residual carbon Rc.

[0075] Furthermore, this embodiment provides a correction device for hydrocarbon parameters and total organic carbon of cuttings, such as Figure 2 As shown, the correction device comprises:

[0076] The logarithmic interactive chart acquisition module 100 is used to acquire the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of the uncontaminated drilling cuttings of a known oil well, and determine the logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2;

[0077] The contaminated drilling cuttings acquisition module 200 is used to compare the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 to obtain the contaminated drilling cuttings in the target oil well;

[0078] The drilling mud contamination area acquisition module 300 is used to calculate the area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings, and obtain the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram, and then obtain the drilling mud contamination area A3=A1-A2;

[0079] The corrected free hydrocarbon content S"1 acquisition module 400 is used to correct the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain the corrected free hydrocarbon content S"1;

[0080] The module 500 for obtaining the corrected pyrolysis hydrocarbon content S"2 is used to correct the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well by using the corrected free hydrocarbon content S"1 according to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, so as to obtain the corrected pyrolysis hydrocarbon content S"2;

[0081] The corrected total organic carbon TOC' acquisition module 600 is used to correct the total organic carbon TOC according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

[0082] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0083] Further, the present invention provides an electronic device, which is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0084] like Figure 3As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The I / O interface 15 is also connected to the bus 14.

[0085] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0086] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the aforementioned correction method for hydrocarbon parameters and total organic carbon of rock cuttings.

[0087] In some embodiments, the aforementioned method for correcting hydrocarbon parameters and total organic carbon of rock cuttings may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the aforementioned method for correcting hydrocarbon parameters and total organic carbon of rock cuttings described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the aforementioned method for correcting hydrocarbon parameters and total organic carbon of rock cuttings in any other appropriate manner (e.g., by means of firmware).

[0088] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0089] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0090] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0091] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0092] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0093] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0094] The server provided in this embodiment includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the correction method for hydrocarbon parameters and total organic carbon of the cuttings is implemented.

[0095] Unless otherwise specifically stated, terms such as processing, computing, calculating, determining, displaying, etc. may refer to the actions and / or processes of one or more processing or computing systems, or similar devices, which operate and convert data represented as physical (e.g., electronic) quantities within registers or memories of a processing system into other data similarly represented as physical quantities within memories, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0096] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments of the present invention may all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. A skilled person may implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present invention.

[0097] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0098] For software implementation, the techniques described in the present invention can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in the present application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0099] Further, in order to illustrate the effect that can be achieved by the correction method for hydrocarbon parameters and total organic carbon of cuttings provided by the present invention, an actual example is used for illustration, as follows:

[0100] Example 1

[0101] This embodiment provides a calibration process for hydrocarbon parameters and total organic carbon of mudstone cuttings obtained by oil-based mud drilling, which is as follows:

[0102] 1. Determine whether the mudstone cuttings from oil-based mud drilling are contaminated. Select mudstone cuttings from multiple wells with water-based mud drilling that are representative of the region, and count the logarithmic values ​​of their pyrolysis parameters, free hydrocarbon content S1, and pyrolysis hydrocarbon content S2, so as to determine the LgS1-LgS2 intersection diagram of the pyrolysis parameters of free hydrocarbon content S1 and pyrolysis hydrocarbon content S2 of the uncontaminated mudstone cuttings in the region. For example, select the free hydrocarbon content S1 and pyrolysis hydrocarbon content S2 of the organic matter pyrolysis parameters of mudstone cuttings from water-based mud in a typical well in the X area of ​​the Xihu Sag in the East China Sea, and determine the LgS1-LgS2 intersection diagram in the region, such as Figure 4 shown.

[0103] 2. Project the free hydrocarbon content S'1 and pyrolysis hydrocarbon content S'2 of the target sample into the determined LgS1-LgS2 intersection diagram in the area. If these sample points fall on the same trend line, it indicates that the target sample is not contaminated by mud additives. If the target sample obviously deviates from the trend line of the uncontaminated sample, it indicates that the target sample is contaminated by mud additives. For example, project the free hydrocarbon content S'1 and pyrolysis hydrocarbon content S'2 of the organic matter pyrolysis parameters of the target sample rock cuttings in the X area of ​​the Xihu Sag in the East China Sea into the determined LgS1-LgS2 intersection diagram. The contaminated rock cuttings obviously deviate from the trend line, and the uncontaminated rock cuttings are distributed near the trend line, such as Figure 5 .

[0104] 3. After the mudstone cuttings are contaminated by oil-based mud, the chromatogram area of ​​organic saturated hydrocarbons in the mudstone cuttings is calculated.

[0105] First determine the standard baseline of the saturated hydrocarbon chromatogram, such as Figure 6 The middle black line, taking the chromatogram of organic matter saturated hydrocarbons in the mudstone cuttings of the X-1 well in the X area of ​​the Xihu Sag in the East China Sea as an example, first determine the baseline of the chromatogram, such as Figure 6 .

[0106] The area enclosed by all the main peak carbon atoms is calculated as the A1 value. For example, the area enclosed by all the main peak carbon atoms in the chromatogram of organic matter saturated hydrocarbons in the 2836-2840m mudstone cuttings of the X-1 well in the X area of ​​the Xihu Sag in the East China Sea is Figure 7 The green enclosed figure in the middle calculates the A1 value in the relevant software.

[0107] Furthermore, oil-based mud affects the main peak carbon number C 14 -C 17 The area between adjacent C 13 and C 18 The peak height is C 14 -C 17 The height correction between the two is to adjust the C 14 , C 15 The peak height and C 13 Same, adjust C 16 , C 17 The peak height and C 18 The same is obtained, so the real peak area A2 of the chromatogram of saturated hydrocarbons in mudstone cuttings is obtained. For example, in the chromatogram of organic saturated hydrocarbons in the X-1 well at 2836-2840 m in the X area of ​​the Xihu Sag in the East China Sea, all the real peaks are surrounded by Figure 8 The red enclosed figure in the middle, calculate the A2 value in the relevant software;

[0108] The area of ​​mud contamination is A3, A3 = A1-A2. For example, the contamination area of ​​mudstone cuttings at 2836-2840 m in the X-1 well in the X area of ​​the Xihu Sag in the East China Sea is calculated by this method, as shown in Table 1.

[0109] The degree of contamination of mudstone cuttings by oil-based mud is the contamination rate α=A3 / A1. For example, the X-1 well in the X area of ​​the Xihu Depression in the East China Sea was selected to calculate the degree of contamination of the cuttings using this method. The specific results are shown in Table 1.

[0110] Table 1

[0111] Depth(m) <![CDATA[Total area A1]]> <![CDATA[True area A2]]> <![CDATA[Pollution area A3]]> Contamination rate α(%) 2836-2840 2564.14 59.17 2504.97 97.69 3280-3286 2521.02 120.55 2400.47 95.22 3318-3322 2656.7 175.23 2601.09 93.40 3438-3442 2537.33 115.41 2421.92 95.45

[0112] 4. Pyrolysis parameter free hydrocarbon content S'1 parameter correction

[0113] The free hydrocarbon content S'1 parameter is most affected by oil-based mud contamination. It is directly deducted on the basis of the mudstone cuttings source rock contamination rate, and the corrected free hydrocarbon content S"1 = S1-S1×α, with a small error and strong practicality. For example, the absolute error of the corrected free hydrocarbon content S"1 value of the X-1 well in the X area of ​​the Xihu Sag in the East China Sea is 0.06 mg / g on average, with a small error. The results are shown in Table 2, and the method is strong in practicality.

[0114] Table 2

[0115]

[0116] 5. Pyrolysis parameters Pyrolysis hydrocarbon content S'2 parameter correction

[0117] Selecting mudstone cuttings from multiple wells with regional representativeness in the same structure of the target area, various mathematical models between the logarithm of the free hydrocarbon content S'1 and the logarithm of the pyrolysis hydrocarbon content S'2 were established, such as linear function, inverse function, quadratic function, cubic function, etc. The results are as follows Fig. 9 As shown, according to the goodness of fit R 2 The size of the data is optimized to select the appropriate data model and determine the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 parameters. For example, the pyrolysis parameters of the typical single well mudstone cuttings in the X area of ​​the Xihu Sag in the East China Sea are suitable for establishing a univariate cubic function model between the logarithm of the free hydrocarbon content S'1 and the logarithm of the pyrolysis hydrocarbon content S'2. The goodness of fit R 2 is 0.861( Fig.10 ), y = 0.155 × x - 0.542 × x 2 -0.036×x 3 +0.865, (y=LgS'2, x=LgS'1).

[0118] According to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 parameters, the corrected pyrolysis hydrocarbon content S"2 value is calculated by correcting the free hydrocarbon content S"1. For example, the average absolute error of the corrected pyrolysis hydrocarbon content S"2 value of Well X-1 in the X area of ​​the Xihu Sag in the East China Sea is 0.31 mg / g, and the average absolute error before correction is 1.48 mg / g. After correction, the error is smaller, which improves the accuracy of the data. The results are shown in Table 3.

[0119] Table 3

[0120]

[0121]

[0122] 6. Total organic carbon content TOC correction

[0123] Among them, total organic carbon TOC = 0.083 (S0 + S1 + S2) + 0.1R C , gaseous hydrocarbon S0, free hydrocarbon content S1, pyrolysis hydrocarbon content S2, and residual carbon Rc are in a fixed proportion in the total organic carbon TOC; the measured value of gaseous hydrocarbon S0 is very small, generally less than 0.01 mg / g, and the total organic carbon TOC = 0.083 (S1 + S2) + 0.1Rc; after being contaminated by mud, the total organic carbon TOC of organic matter in the oil-based mud drilling cuttings in the Xihu Sag and the pyrolysis parameters free hydrocarbon content S1, pyrolysis hydrocarbon content S2, and residual carbon Rc do not conform to the quantitative relationship formula of TOC = 0.083 (S1 + S2) + 0.1Rc.

[0124] The correction formula of total organic carbon content TOC is corrected total organic carbon TOC'=0.083(corrected free hydrocarbon content S"1+corrected pyrolysis hydrocarbon content S"2)+Rc, which can obtain accurate TOC correction value. For example, after the X-1 well in the X area of ​​the Xihu Sag in the East China Sea was corrected by this method, the average absolute error of the TOC value was reduced from 0.87% to 0.50%, and a relatively accurate value was obtained, realizing the effective evaluation of the source rock. The correction results are shown in Table 4.

[0125] Table 4

[0126]

[0127]

[0128] In summary, the correction method provided by the present invention can achieve good correction effects on free hydrocarbon content S1, pyrolysis hydrocarbon content S2, and total organic carbon TOC, and can provide accurate results for subsequent rapid evaluation of source rocks and guide oil and gas exploration deployment.

[0129] It is stated that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0130] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0131] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0132] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for correcting hydrocarbon parameters and total organic carbon of rock cuttings, characterized in that: The correction method comprises: Obtaining the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of uncontaminated drilling cuttings of a known oil well, and determining a logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2; Comparing the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, to obtain the contaminated drilling cuttings in the target oil well; The area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings is calculated, and the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram is obtained, and then the contamination area A3 of the drilling mud is obtained = A1-A2; Correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain a corrected free hydrocarbon content S"1; According to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well is corrected by using the corrected free hydrocarbon content S"1 to obtain the corrected pyrolysis hydrocarbon content S"2; With the aid of the obtained corrected free hydrocarbon content S"1 and corrected pyrolysis hydrocarbon content S"2, the total organic carbon TOC is corrected according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

2. The method for calibrating hydrocarbon parameters and total organic carbon of rock cuttings according to claim 1, characterized in that: The free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well are compared with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, including: trend line fitting of the logarithmic scatter plot of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2, and then selecting a distribution line with a confidence interval of 95% on both sides of the trend line based on the trend line to form an intersection uncontaminated area, if the data points of the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings are located in the intersection uncontaminated area, it is determined that it is not contaminated, otherwise it is determined that it is contaminated; Preferably, the goodness of fit R of the trend line obtained in the trend line fitting is 2 ≥0.

89.

3. The method for calibrating hydrocarbon parameters and total organic carbon of rock cuttings according to claim 1 or 2, characterized in that: The main peak carbon atoms include: all carbon atoms detected in the saturated hydrocarbon chromatogram; Preferably, the actual peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram comprises: adjusting the peak area of ​​C 14 , C 15 The peak height and C 13 Same, adjust C 16 , C 17 The peak height and C 18 The area of ​​all carbon atoms detected in the saturated hydrocarbon chromatogram and the baseline is then calculated.

4. The method for calibrating hydrocarbon parameters and total organic carbon of cuttings according to any one of claims 1 to 3, characterized in that: The calculation formula for correcting the free hydrocarbon content S'1 of the drilling cuttings of the target oil well is as follows: Corrected free hydrocarbon content S"1=free hydrocarbon content S'1-free hydrocarbon content S'1×α, α=A3 / A1.

5. The method for calibrating hydrocarbon parameters and total organic carbon of rock cuttings according to any one of claims 1 to 4, characterized in that: The relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is obtained by fitting the logarithm of the free hydrocarbon content S'1 and the logarithm of the pyrolysis hydrocarbon content S'2.

6. The method for calibrating hydrocarbon parameters and total organic carbon of rock cuttings according to claim 5, characterized in that: The function used for fitting includes: one or a combination of at least two of a linear function, an inverse function, a quadratic function or a cubic function; Preferably, the goodness of fit R of the fitted relationship is 2 ≥0.

85.

7. The method for calibrating hydrocarbon parameters and total organic carbon of cuttings according to any one of claims 1 to 6, characterized in that: The relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 is as follows: Total organic carbon TOC = 0.83 × (free hydrocarbon content S'1 + pyrolysis hydrocarbon content S'2) + residual carbon Rc.

8. A calibration device for hydrocarbon parameters and total organic carbon of rock cuttings, characterized in that: The correction device comprises: A logarithmic interactive chart acquisition module is used to acquire the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 of uncontaminated drilling cuttings of a known oil well, and determine the logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2; A contaminated drilling cuttings acquisition module is used to compare the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well with the obtained logarithmic interactive chart of the free hydrocarbon content S1 and the pyrolysis hydrocarbon content S2 to obtain the contaminated drilling cuttings in the target oil well; The drilling mud contamination area acquisition module is used to calculate the area A1 of the main peak carbon atom and the baseline of the organic saturated hydrocarbon chromatogram of the contaminated drilling cuttings, and obtain the real peak area A2 of the drilling cuttings saturated hydrocarbon chromatogram, and then obtain the drilling mud contamination area A3 = A1-A2; A module for obtaining a corrected free hydrocarbon content S"1 is used to correct the free hydrocarbon content S'1 of the drilling cuttings of the target oil well to obtain a corrected free hydrocarbon content S"1; A module for obtaining a corrected pyrolysis hydrocarbon content S"2 is used to correct the pyrolysis hydrocarbon content S'2 of the drilling cuttings of the target oil well using the corrected free hydrocarbon content S"1 according to the relationship between the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2, so as to obtain a corrected pyrolysis hydrocarbon content S"2; The corrected total organic carbon TOC' acquisition module is used to correct the total organic carbon TOC according to the relationship between the total organic carbon TOC, the free hydrocarbon content S'1 and the pyrolysis hydrocarbon content S'2 to obtain the corrected total organic carbon TOC'.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for correcting hydrocarbon parameters and total organic carbon of rock cuttings as described in any one of claims 1-7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by a processor, the method for correcting hydrocarbon parameters and total organic carbon of rock cuttings according to any one of claims 1 to 7 is implemented.

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