River channel sand body period division method, system, equipment and medium

Abstract

The invention provides a river channel sand body period division method, system and device and a medium. The method comprises the following steps that S1, uranium-containing mudstone is determined based on high GR characteristics in multiple target well electrical logging curves; s2, uranium-containing mudstone bottoms of a plurality of wells are obtained through a resistivity half amplitude point method; s3, the uranium-bearing mudstone bottoms of the multiple wells are leveled, and the sand body bottom boundary of the target area is obtained; s4, the undercutting depth is obtained based on the sand body bottom boundary, the deposition environment of the target area is recovered, and division is conducted according to the deposition sequence based on sand body deposition; on one hand, a division method with the sand body top as a mark of the deposition end stage is improved, the deposition thickness of one stage can be restored more accurately, and the ancient landform and the deposition environment can be restored more accurately; on the other hand, river channels in different periods can be accurately identified, and a basis is provided for development technology policy adjustment.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method, system, equipment and medium for dividing river channel sand bodies into stages. Background Art

[0002] In the process of oil and gas reservoir development, the understanding of stratigraphic division and sand body distribution and connectivity is very important, which is crucial to the adjustment of reservoir development and injection and production. At present, the stratigraphic division mainly adopts the sand body top alignment method at home and abroad, and then calculates the sand body thickness, restores the ancient landform, and conducts further research and understanding of the sedimentation. The corresponding developed oil fields are often small in area, and it can be considered that the structural position is the same during the lake flooding period. This method does not consider the influence of mudstone deposition thickness on the stratum during the river channel disappearance period, resulting in inaccurate calculation of stratum deposition thickness.

[0003] There are four traditional methods for identifying single channel boundaries, namely: identification of abandoned channels, identification of differences in the top surface elevation of channel sand bodies, identification of differences in the scale of channel sand bodies, and identification of discontinuous inter-channel sand bodies. These methods lack guidance for the demarcation of channel boundaries where channels swing frequently and the scales of different stages are not much different, and cannot guide the actual demarcation of river stages. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method, system, equipment and medium for dividing river sand bodies into stages, which can more accurately restore the ancient landforms and sedimentary environment, and can accurately identify river channels of different stages, providing a basis for adjusting development technology policies.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for dividing river channel sand bodies into stages comprises the following steps:

[0007] S1: Determine uranium-bearing mudstone based on high GR features in the electrical logging curves of multiple target wells;

[0008] S2: The uranium-bearing mudstone bottom of multiple wells was obtained using the resistivity half-amplitude point method;

[0009] S3: Level the uranium-bearing mudstone bottoms of multiple wells and obtain the sand body bottom boundary of the target area;

[0010] S4: Based on the bottom boundary of the sand body, the incision depth is obtained, the sedimentary environment of the target area is restored, and the sand body deposition is divided according to the deposition order.

[0011] Furthermore, the process of determining uranium-bearing mudstone based on the high GR features in the electrical logging curves of multiple target wells is as follows:

[0012] The GR value display amplitude was adjusted on the electrical logging curve, and high GR features exceeding the normal value by more than 2 times were selected as uranium-bearing mudstone.

[0013] Furthermore, the process of obtaining the uranium-bearing mudstone bottom of multiple wells by using the resistivity half-width point method is as follows:

[0014] Select the lowest and highest resistivity values ​​in the same cycle;

[0015] Get the average of the highest and lowest values;

[0016] The position of the average value was obtained and regarded as the bottom of the uranium-bearing mudstone.

[0017] Furthermore, the process of leveling the uranium-containing mudstone bottoms of the multiple wells is as follows:

[0018] Based on the uranium-bearing mudstone bottom of multiple wells, a well-connected profile of each well in the well area is made;

[0019] Assuming that the bottom of the uranium-bearing mudstone in each well is at the same depth and the same elevation, each well is aligned in elevation.

[0020] Furthermore, the process of obtaining the downcutting depth based on the bottom boundary of the sand body is as follows: the bottom of the uranium-bearing mudstone obtained from multiple wells is used as the top of the uranium-bearing mudstone layer, and the downcutting depth is obtained by subtracting the bottom boundary depth value of the sand body from the top depth value of the uranium-bearing mudstone layer;

[0021] The downcutting depth is the thickness of the river channel deposits, which is used to reflect the height of the ancient landform. If the downcutting depth is large, the ancient landform is a low-lying area. If the downcutting depth is small, the ancient landform is a structural high.

[0022] Furthermore, the process of restoring the deposition environment of the target area is:

[0023] The area between the top of the uranium-bearing mudstone and the bottom of the sand body is taken as the channel marker layer;

[0024] Determine the river channel plan distribution according to the characteristics of the river channel marker layer;

[0025] If the target area has a high degree of consistency with the characteristics of the river marker layer and has the same marker layer characteristics, it is the same river that was deposited in the same period;

[0026] If the target area has a high degree of consistency with the characteristics of the river marker layer, but has different marker layer characteristics, they are different rivers that were deposited in the same period.

[0027] Furthermore, the results of the classification based on the order of deposition of sand bodies include:

[0028] Type 1: The sand body is in gradual contact with the bottom of the marker layer, with low-GR muddy siltstone in between;

[0029] Type II: The sand body is in gradual contact with the bottom of the marker layer, with high GR mudstone in between;

[0030] Type III: The sand body is in gradual contact with the bottom of the marker layer, with GR gradually high mudstone in between;

[0031] Type 4: The sand body is in direct contact with the bottom of the marker layer, with no mudstone gradient in between.

[0032] A river channel sand body stage classification system comprises the following steps:

[0033] A first processing module is configured to determine uranium-bearing mudstone based on high GR features in electrical logging curves of multiple target wells;

[0034] A second processing module is configured to obtain uranium-bearing mudstone bottoms of a plurality of wells using a resistivity half-amplitude point method;

[0035] A third processing module is configured to flatten the uranium-bearing mudstone bottom of the plurality of wells and obtain the bottom boundary of the sand body in the target area;

[0036] The output module is configured to obtain the downcut depth based on the bottom boundary of the sand body, restore the sedimentary environment of the target area, and divide it according to the deposition order based on the sand body deposition.

[0037] A computer device comprises 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 a method for dividing river channel sand bodies into stages are implemented.

[0038] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for dividing river channel sand bodies into stages.

[0039] Compared with the prior art, the present invention has the following beneficial technical effects:

[0040] The present invention provides a river channel sand body stage division method, system, equipment and medium, comprising the following steps: S1: determining uranium-containing mudstone based on high GR features in electrical logging curves of multiple target wells; S2: obtaining the uranium-containing mudstone bottoms of multiple wells by using the resistivity half-width point method; S3: flattening the uranium-containing mudstone bottoms of multiple wells and obtaining the sand body bottom boundary of the target area; S4: obtaining the undercutting depth based on the sand body bottom boundary, restoring the sedimentary environment of the target area, and dividing the sand body according to the deposition order based on the sand body deposition; on the one hand, the present application improves the division method using the sand body top as the end of the deposition mark, can more accurately restore the sedimentary thickness of a period, and more accurately restore the ancient landform and sedimentary environment; on the other hand, it can accurately identify river channels of different stages, and provide a basis for the adjustment of development technology policies. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1This is a flow chart of a method for dividing river channel sand bodies into stages according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the river channel incision depth according to an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of type 1 of the stage division of river channel sand bodies according to an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of type 2 of the river channel sand body stage division according to an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of type three of the river channel sand body stage classification according to an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of type 4 of the stage division of river channel sand bodies according to an embodiment of the present invention;

[0047] Figure 7 It is a schematic diagram of the division results of river channels at different stages according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] The embodiment of the present invention provides a method for dividing river channel sand bodies into stages. Figure 1As shown, the following steps are included:

[0052] S1: Determine uranium-bearing mudstone based on high GR features in the electrical logging curves of multiple target wells;

[0053] S2: The uranium-bearing mudstone bottom of multiple wells was obtained using the resistivity half-amplitude point method;

[0054] S3: Level the uranium-bearing mudstone bottoms of multiple wells and obtain the sand body bottom boundary of the target area;

[0055] S4: Based on the bottom boundary of the sand body, the incision depth is obtained, the sedimentary environment of the target area is restored, and the sand body deposition is divided according to the deposition order.

[0056] It should be noted that the target area described in this embodiment refers to a reservoir with abnormal GR values ​​or other obvious parameter anomalies. Oil, gas and water wells are deployed in the target area, and open hole logging is performed on the oil, gas and water wells to obtain the electrical logging curve of each well. The deployed oil, gas and water wells are the target wells.

[0057] Preferably, the process of determining uranium-bearing mudstone based on high GR features in electrical logging curves of multiple target wells is:

[0058] The GR value display amplitude was adjusted on the electrical logging curve, and high GR features exceeding the normal value by more than 2 times were selected as uranium-bearing mudstone.

[0059] It should be noted that the GR value described in this embodiment is a gain margin, which is used to measure the stability of the system. In this application, the specific steps for adjusting the GR value are as follows: each region of the oil and gas reservoir has a general range of GR. For example, the GR value of a certain oil field ranges from 50 to 60, and the GR value of the uranium-containing mudstone part reaches 120. The curve cannot be displayed. In the relevant professional software, adjust the scale range to 50-250, and the high GR abnormal value can be displayed.

[0060] Preferably, the process of obtaining the uranium-bearing mudstone bottom of multiple wells by using the resistivity half-width point method is:

[0061] Select the lowest and highest resistivity values ​​in the same cycle;

[0062] Get the average of the highest and lowest values;

[0063] The position of the average value was obtained and regarded as the bottom of the uranium-bearing mudstone.

[0064] It should be noted that the cycle described in this embodiment refers to a sequence of layers formed by repeated deposition under the same sequence of deposition actions and deposition conditions.

[0065] Preferably, the process of leveling the uranium-containing mudstone bottoms of the multiple wells is:

[0066] Based on the uranium-bearing mudstone bottom of multiple wells, a well-connected profile of each well in the well area is made;

[0067] Assuming that the bottom of the uranium-bearing mudstone in each well is at the same depth and the same elevation, each well is aligned in elevation.

[0068] Preferably, Figure 2 As shown, the process of obtaining the downcutting depth based on the bottom boundary of the sand body is: the bottom of the uranium-bearing mudstone obtained from multiple wells is used as the top of the uranium-bearing mudstone layer, and the downcutting depth is obtained by subtracting the bottom boundary depth value of the sand body from the top depth value of the uranium-bearing mudstone layer;

[0069] The downcutting depth is the thickness of the river channel deposits, which is used to reflect the height of the ancient landform. If the downcutting depth is large, the ancient landform is a low-lying area. If the downcutting depth is small, the ancient landform is a structural high.

[0070] Preferably, the process of restoring the deposition environment of the target area is:

[0071] The area between the top of the uranium-bearing mudstone and the bottom of the sand body is taken as the channel marker layer;

[0072] Determine the river channel plan distribution according to the characteristics of the river channel marker layer;

[0073] If the target area has a high degree of consistency with the characteristics of the river marker layer and has the same marker layer characteristics, it is the same river that was deposited in the same period;

[0074] If the target area has a high degree of consistency with the characteristics of the river marker layer, but has different marker layer characteristics, they are different rivers that were deposited in the same period.

[0075] Furthermore, the results of the classification based on the order of deposition of sand bodies include:

[0076] Type 1: Figure 3 As shown, the sand body is in gradual contact with the bottom of the marker layer, with low-GR muddy siltstone intercalated;

[0077] Type 2: Figure 4 As shown, the sand body is in gradual contact with the bottom of the marker layer, with high GR mudstone in between;

[0078] Type 3: Figure 5 As shown, the sand body is in gradual contact with the bottom of the marker layer, with GR gradually high mudstone in between;

[0079] Type 4: Figure 6 As shown, the sand body is in direct contact with the bottom of the marker layer, with no mudstone gradient in between.

[0080] It should be noted that the plane distribution described in this embodiment refers to the plane distribution range and distribution characteristics of the sand body.

[0081] The high degree of feature fit means that the logging curve of the river sedimentary reservoir has a positive cycle feature, and the positive cycle feature is a low GR value at the bottom, a high GR value at the top, and a gradual change feature in the middle.

[0082] The same marking layer features described in this embodiment can be understood as: Figure 3 , 4 , 5, and 6, the similarities in the characteristic morphology of the GR, SP, RILD, and RILM curves are the same marker layer characteristics.

[0083] It should be noted that if Figure 7 As shown in the figure, two river channels are divided into river channel 1 and river channel 2. Each river channel is identified according to the characteristics of single wells in the area. The river channels with the same single well characteristics are the same river channel, and the river channels with different single well characteristics are different river channels. The single well characteristics can be based on Figure 3 , 4 , 5, 6 GR, SP, RILD, RILM curve morphological characteristics to distinguish, such as Figure 3 The single well with medium characteristics is divided into channel A. Figure 4 The single well with medium characteristics is divided into B channel. Figure 5 The single wells with medium characteristics are divided into C channels. Figure 6 Single wells with medium characteristics are divided into D channels.

[0084] The present invention provides a river channel sand body stage classification system, comprising the following steps:

[0085] A first processing module is configured to determine uranium-bearing mudstone based on high GR features in electrical logging curves of multiple target wells;

[0086] A second processing module is configured to obtain uranium-bearing mudstone bottoms of a plurality of wells using a resistivity half-amplitude point method;

[0087] A third processing module is configured to flatten the uranium-bearing mudstone bottom of the plurality of wells and obtain the bottom boundary of the sand body in the target area;

[0088] The output module is configured to obtain the downcut depth based on the bottom boundary of the sand body, restore the sedimentary environment of the target area, and divide it according to the deposition order based on the sand body deposition.

[0089] In another embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory being used to store a computer program, the computer program comprising program instructions, and the processor being used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in a computer storage medium to implement a corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a method for dividing river channel sand bodies into stages.

[0090] In another embodiment of the present invention, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both the built-in storage medium in the computer device and the extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the above-mentioned embodiment in the method for dividing the stages of a river channel sand body.

[0091] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0093] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dividing river channel sand bodies into stages. It is characterized in that The following steps are involved: S1: Determine uranium-bearing mudstone based on high GR features in the electrical logging curves of multiple target wells; S2: The uranium-bearing mudstone bottom of multiple wells was obtained using the resistivity half-amplitude point method; S3: Level the uranium-bearing mudstone bottoms of multiple wells and obtain the sand body bottom boundary of the target area; S4: Based on the bottom boundary of the sand body, the incision depth is obtained, the sedimentary environment of the target area is restored, and the sand body deposition is divided according to the deposition order.

2. A method for dividing river channel sand bodies into stages according to claim 1, It is characterized in that The process of determining uranium-bearing mudstone based on high GR features in electrical logging curves of multiple target wells is as follows: The GR value display amplitude was adjusted on the electrical logging curve, and high GR features exceeding the normal value by more than 2 times were selected as uranium-bearing mudstone.

3. A method for dividing river channel sand bodies into stages according to claim 1, It is characterized in that The process of obtaining the uranium-bearing mudstone bottom of multiple wells by using the resistivity half-width point method is as follows: Select the lowest and highest resistivity values ​​in the same cycle; Get the average of the highest and lowest values; The position of the average value was obtained and regarded as the bottom of the uranium-bearing mudstone.

4. A method for dividing river channel sand bodies into stages according to claim 1, It is characterized in that The process of leveling the uranium-bearing mudstone bottoms of multiple wells is as follows: Based on the uranium-bearing mudstone bottom of multiple wells, a well-connected profile of each well in the well area is made; Assuming that the bottom of the uranium-bearing mudstone in each well is at the same depth and the same elevation, each well is aligned in elevation.

5. A method for dividing river channel sand bodies into stages according to claim 1, It is characterized in that The process of obtaining the downcutting depth based on the bottom boundary of the sand body is as follows: the bottom of the uranium-bearing mudstone obtained from multiple wells is used as the top of the uranium-bearing mudstone layer, and the downcutting depth is obtained by subtracting the bottom boundary depth value of the sand body from the top depth value of the uranium-bearing mudstone layer; The downcutting depth is the thickness of the river channel deposits, which is used to reflect the height of the ancient landform. If the downcutting depth is large, the ancient landform is a low-lying area. If the downcutting depth is small, the ancient landform is a structural high.

6. A method for dividing river channel sand bodies into stages according to claim 1, It is characterized in that The process of restoring the sedimentary environment of the target area is: The area between the top of the uranium-bearing mudstone and the bottom of the sand body is taken as the channel marker layer; Determine the river channel plan distribution according to the characteristics of the river channel marker layer; If the target area has a high degree of consistency with the characteristics of the river marker layer and has the same marker layer characteristics, it is the same river that was deposited in the same period; If the target area has a high degree of consistency with the characteristics of the river marker layer, but has different marker layer characteristics, they are different rivers that were deposited in the same period.

7. A method for dividing river channel sand bodies into stages according to claim 6, It is characterized in that The results of the classification based on the order of deposition of sand bodies include: Type 1: The sand body is in gradual contact with the bottom of the marker layer, with low-GR muddy siltstone in between; Type II: The sand body is in gradual contact with the bottom of the marker layer, with high GR mudstone in between; Type III: The sand body is in gradual contact with the bottom of the marker layer, with GR gradually high mudstone in between; Type 4: The sand body is in direct contact with the bottom of the marker layer, with no mudstone gradient in between.

8. A system for classifying river channel sand bodies into different stages. It is characterized in that A method for dividing river channel sand bodies into stages based on any one of claims 1 to 7 comprises the following steps: A first processing module is configured to determine uranium-bearing mudstone based on high GR features in electrical logging curves of multiple target wells; A second processing module is configured to obtain uranium-bearing mudstone bottoms of a plurality of wells using a resistivity half-amplitude point method; A third processing module is configured to flatten the uranium-bearing mudstone bottom of the plurality of wells and obtain the bottom boundary of the sand body in the target area; The output module is configured to obtain the downcut depth based on the bottom boundary of the sand body, restore the sedimentary environment of the target area, and divide it according to the deposition order based on the sand body deposition.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, the steps of the method for dividing river channel sand bodies into stages as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program. It is characterized in that When the computer program is executed by a processor, the steps of a method for dividing river channel sand bodies into stages as described in any one of claims 1 to 7 are implemented.

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