Seasonal unfixed river channel sand body identification and classification method and device

Abstract

The invention provides a seasonal unfixed river channel sand body identification and classification method and device, and belongs to the technical field of oil-gas exploration. The river channel type is analyzed and determined in combination with climate environment and material source supply conditions; performing ancient landform background analysis to determine various river channel distribution rules; carrying out sequence stratigraphic division to establish an isochronous framework to constrain river channel identification; different types of river channel characteristics are identified through well-to-seismic joint calibration; the seismic imaging precision of the river channel is improved through targeted seismic data acquisition and processing; comprehensively applying seismic data to describe spatial and temporal distribution of river channel sand bodies; and comprehensively evaluating and dividing a favorable river channel sand body development area. Under the special geological conditions that the influence of climatic changes in the paleo-sedimentary period is large and the material source supply difference is obvious, the seasonal unfixed river channel sand body can be effectively recognized and classified by applying the method, the result is more reliable and accurate, the oil-gas exploration effect is improved, and the practicability is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas exploration, and in particular relates to a method and a device for identifying and classifying seasonal non-fixed river channel sand bodies. Background Art

[0002] Currently, the northern margin of the Qaidam Basin, similar to the region of the Qaidam Basin, experienced rapid dry-wet climate fluctuations during the Paleogene sedimentary period, with frequent seasonal alternations between high and low water periods and significant variations in provenance, resulting in diverse river types and the absence of relatively fixed channels. This frequent seasonal shift, combined with the geological conditions of the Paleogene sedimentary period, makes channel sand body identification difficult and classification standards inconsistent. Consequently, effective methods for channel sand body identification and classification are lacking in this area. This difficulty and inconsistent classification standards have become technical bottlenecks hindering Paleogene oil and gas exploration in this area.

[0003] The present invention provides a rationally designed device for identifying and classifying seasonal non-fixed river channel sand bodies. Under special geological conditions where the influence of climate change during the ancient sedimentary period is significant and differences in material supply are obvious, the method can be applied to effectively identify and classify seasonal non-fixed river channel sand bodies. The results are more reliable and accurate, thereby improving the effectiveness of oil and gas exploration and being more practical. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a method and device for identifying and classifying seasonal non-fixed river channel sand bodies. For the seasonal non-fixed river channel sand body identification and classification device, under special geological conditions where the influence of climate change in the ancient sedimentary period is large and the differences in material supply are obvious, the method can be applied to effectively identify and classify seasonal non-fixed river channel sand bodies. The results are more reliable and accurate, thereby improving the effectiveness of oil and gas exploration and being more practical.

[0005] The present invention provides a method for identifying and classifying seasonal non-fixed river channel sand bodies, comprising:

[0006] Determine the target river channel deposition period based on the paleoclimate environment and provenance supply conditions, and clarify the river channel development type through the target river channel deposition period;

[0007] The river channel distribution pattern is determined by paleo-geomorphic background analysis, and the paleo-geomorphic background type is determined by paleo-geomorphic background analysis during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and the plane distribution characteristics of river channel sand bodies.

[0008] Establishing an isochronous framework based on sequence stratigraphic divisions to constrain river channel identification;

[0009] Through the joint calibration of well and seismic data, the characteristics of different types of river channels are identified, and it is clearly stated that the seismic waveform characteristics of river channel sand bodies are low frequency and strong amplitude;

[0010] Targeted seismic data acquisition and processing improves the accuracy of river channel seismic imaging;

[0011] The temporal and spatial distribution of channel sand bodies is depicted through comprehensive application of seismic data.

[0012] Preferably, the determination of the target river channel deposition period based on the paleoclimate environment in combination with the provenance supply conditions includes:

[0013] Determine the river channel deposition period through clay mineral analysis and identification of typical climate indicator minerals such as gypsum and halite;

[0014] Among them, by analyzing the characteristics of light and heavy minerals and ancient water flows, the source system of river development is clarified; by dissecting typical drilling wells to obtain the differences in the supply capacity of the source system, the formation of different types of river systems is controlled.

[0015] Preferably, the paleogeomorphological background includes:

[0016] Three types of paleo-geomorphological settings: paleo-uplift, paleo-slope and paleo-depression;

[0017] Among them, the cumulative sand body thickness greater than 50 meters is determined to be the ancient uplift landform background, the single-layer sand body thickness greater than 50 meters is determined to be the ancient slope landform background, and the single-layer sand body thickness less than 10 meters is determined to be the ancient slope landform background.

[0018] Preferably, the establishment of an isochronous framework to constrain river channel identification based on sequence stratigraphic division includes:

[0019] The high-resolution comparison of drilling, logging and seismic data was used to divide the stratigraphic units into multiple fourth-order and fifth-order sequences, and the fifth-order sequences were used as mapping units to conduct fine channel sand body comparison within the isochronous stratigraphic framework.

[0020] Preferably, the identification of different types of river channel characteristics through combined well-seismic calibration includes:

[0021] The channel width, sand body thickness, amplitude intensity and bright spot brightness are analyzed through forward modeling; the differences in bright spot characteristics of different types of channel sand bodies are clarified through comprehensive analysis of the sedimentary characteristics of the channel sand bodies and the seismic response characteristics.

[0022] Preferably, the comprehensive application of seismic data to depict the spatiotemporal distribution of river channel sand bodies includes:

[0023] By tracking and interpreting river channel seismic "bright spots" under the constraints of an isochronous grid, the planar distribution characteristics of different types of river channels are determined;

[0024] Through isochronal seismic amplitude attribute slice analysis, the migration and evolution patterns of multiple types of river channels in different sedimentary periods are determined;

[0025] The spatiotemporal distribution of channel sand bodies is determined through multi-parameter reservoir inversion prediction based on well logging evaluation and rock physics modeling.

[0026] Preferably, the method further comprises:

[0027] A comprehensive analysis is conducted on the planar distribution characteristics of various types of channel sand bodies that are greatly affected by seasonal changes and have no fixed river channels, and favorable channel sand body development areas are divided through comprehensive evaluation.

[0028] Based on the same inventive concept, an embodiment of the present invention further provides a seasonal non-fixed river channel sand body identification and classification device, comprising:

[0029] The first determination module is used to determine the target river channel deposition period based on the paleoclimate environment and the provenance supply conditions, and to clarify the river channel development type through the target river channel deposition period;

[0030] The second determination module is used to determine the river channel distribution pattern based on the paleo-geomorphic background analysis. The paleo-geomorphic background type is determined by analyzing the paleo-geomorphic background during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and the plane distribution characteristics of river channel sand bodies.

[0031] The first identification module is used to establish an isochronous framework to constrain river channel identification based on sequence stratigraphic division;

[0032] The second identification module is used to identify the characteristics of different types of river channels through joint well-seismic calibration, clearly defining the seismic waveform characteristics of river channel sand bodies as low-frequency and high-amplitude;

[0033] Precision improvement module, used for targeted seismic data acquisition and processing to improve the accuracy of river channel seismic imaging;

[0034] The sand body distribution characterization module is used to characterize the spatiotemporal distribution of river channel sand bodies through the comprehensive application of seismic data.

[0035] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0036] a memory storing a computer program;

[0037] The processor implements a method for identifying and classifying seasonal non-fixed river channel sand bodies when executing the program stored in the memory.

[0038] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, characterized in that a computer program is stored therein, and when the computer program is executed by a processor, a method for identifying and classifying seasonal non-fixed river channel sand bodies is implemented.

[0039] The beneficial effects of the present invention include: combining analysis of climate environment and material supply conditions to clarify channel types; paleo-geomorphic background analysis to determine the distribution patterns of various types of channels; establishing an isochronous framework to constrain channel identification through sequence stratigraphic division; identifying the characteristics of different types of channels through joint well-seismic calibration; improving the accuracy of seismic imaging of river channels through targeted seismic data acquisition and processing; characterizing the spatiotemporal distribution of channel sand bodies through comprehensive application of seismic data; and comprehensively evaluating and dividing favorable areas for channel sand body development. The present invention provides a rationally designed method and device for identifying and classifying seasonal non-fixed channel sand bodies. Under special geological conditions that are greatly affected by climate change during the paleo-depositional period and have significant differences in material supply, the method and device can effectively identify and classify seasonal non-fixed channel sand bodies. The results are more reliable and accurate, improving oil and gas exploration results and enhancing practicality.

[0040] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a flow chart of a seasonal non-fixed river channel sand body identification and classification method of the present invention;

[0043] Figure 2 A schematic diagram of a seasonal non-fixed river channel sand body identification and classification method according to the present invention;

[0044] Figure 3 This is a schematic diagram of a seasonal non-fixed river channel sand body identification and classification device of the present invention;

[0045] Figure 4 Schematic diagram of an electronic device used in the method of the present invention. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 making creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second" etc. in this application 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 application described herein. In this application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the directions or positional relationships shown in the accompanying drawings.

[0048] The present invention provides a method for identifying and classifying seasonal non-fixed river channel sand bodies, see Figure 1 ,include:

[0049] S101: Determine the target river channel deposition period based on the paleoclimate environment and provenance supply conditions, and clarify the river channel development type through the target river channel deposition period;

[0050] S102: Determine the river channel distribution pattern based on paleo-geomorphic background analysis, and clarify the paleo-geomorphic background type through paleo-geomorphic background analysis during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and river channel sand body planar distribution characteristics;

[0051] S103: Establishing an isochronous framework to constrain river channel identification based on sequence stratigraphic division;

[0052] S104: Identify the characteristics of different types of river channels through joint well-seismic calibration, and clearly define the seismic waveform characteristics of river channel sand bodies as low-frequency and high-amplitude;

[0053] S105: Targeted seismic data acquisition and processing to improve the accuracy of river channel seismic imaging;

[0054] S106: Characterize the spatiotemporal distribution of channel sand bodies through comprehensive application of seismic data.

[0055] It should be noted that the present invention mainly targets the identification of sand bodies without fixed river channels during the Paleo-Neogene sedimentary period in the northern margin of the Qaidam Basin.

[0056] The following combination Figure 2 This paper provides a detailed description of the identification and classification of sand bodies without fixed channels during the Paleogene-Neogene sedimentary period in the northern margin of the Qaidam Basin.

[0057] Specifically, determining the target river channel deposition period based on paleoclimate environment combined with provenance supply conditions includes:

[0058] Determine the river channel deposition period through clay mineral analysis and identification of typical climate indicator minerals such as gypsum and rock salt;

[0059] Among them, by analyzing the characteristics of light and heavy minerals and ancient water flows, the source system of river development is clarified; by dissecting typical drilling wells to obtain the differences in the supply capacity of the source system, the formation of different types of river systems is controlled.

[0060] Specifically, in step S101, clay mineral analysis and identification of typical climate indicator minerals such as gypsum and halite indicate that during the Paleogene-Neogene sedimentary period, the climate conditions in the Qaidam Basin evolved through three major stages: humid, semi-arid-semi-humid, and dry-cold. The Oligocene (E32) to Miocene (N1) period in the northern Qaidam Basin was a semi-arid-semi-humid phase, characterized by frequent seasonal climate changes, which influenced the development of distinct provenance systems and river types in the region. Systematic analysis of light and heavy minerals and paleocurrent characteristics revealed the development of four major provenance systems in the Paleogene-Neogene region of the northern Qaidam Basin: Dongping, Niudong, Saishitengshan, and Yuka. These systems exhibit strong inheritance. Analysis of representative wells revealed significant differences in the supply capacity of these provenance systems, which in turn controlled the formation of different types of river systems. The Yuka provenance is large, dominated by long-sourced sources, resulting in relatively stable and complete river systems. The Saishitengshan, Dongping, and Niudong provenances are smaller, dominated by short- and medium-sourced sources, resulting in rapidly changing river systems and lack of fixed channels. Through field geological surveys and drilling core data, it is clear that three types of river channels developed in the Paleogene in the northern margin of Qaidam Basin: braided rivers, meandering rivers and anatomic rivers.

[0061] It should be noted that in step S102: the river channel distribution pattern is determined based on the paleogeomorphic background analysis, and the paleogeomorphic background type is clarified through the paleogeomorphic background analysis during the sedimentary period. Different paleogeomorphic backgrounds control the formation of different river types and river channel sand body planar distribution characteristics.

[0062] Specifically, the paleo-geomorphological background includes three types of paleo-geomorphological backgrounds: paleo-uplift, paleo-slope and paleo-depression;

[0063] Among them, the cumulative sand body thickness greater than 50 meters is determined to be the ancient uplift landform background, the single-layer sand body thickness greater than 50 meters is determined to be the ancient slope landform background, and the single-layer sand body thickness less than 10 meters is determined to be the ancient slope landform background.

[0064] Specifically, through the analysis of the paleo-geomorphological background during the sedimentary period, it is clear that the northern margin of Qaidam mainly developed three types of paleo-geomorphological backgrounds during the Paleo-Neogene sedimentary period: paleo-uplift, paleo-slope and paleo-depression. Different geomorphological backgrounds controlled the formation of different river types and the plane distribution characteristics of river channel sand bodies. Among them, the paleo-uplift area is close to the source, with a large terrain slope and braided rivers as the main body. The river channel changes rapidly and is affected by the later river reconstruction. Multiple river channels are superimposed, the cumulative sand body thickness is large (>50m), and it presents a large-scale continuous distribution feature. The ancient slope area is far away from the provenance and has a relatively gentle terrain. It is dominated by meandering rivers and anastomosed rivers with relatively fixed river channels and thick single-layer sand bodies (>20m). Affected by local geomorphological changes, the rivers evolved from medium- and low-curvature meandering rivers to high-curvature meandering rivers and anastomosed rivers as they migrated from the high part of the ancient slope to the bottom. The ancient depression area has a larger slope and is dominated by anastomosed rivers. It is significantly affected by seasonal climate changes, has no fixed river channels, and has a small thickness of single-layer sand bodies (less than 10m), showing a continuous distribution feature.

[0065] In some optional embodiments, establishing an isochronous framework to constrain river channel identification based on sequence stratigraphic division includes:

[0066] The high-resolution comparison of drilling, logging and seismic data was used to divide the stratigraphic units into multiple fourth-order and fifth-order sequences, and the fifth-order sequences were used as mapping units to conduct fine channel sand body comparison within the isochronous stratigraphic framework.

[0067] Specifically, high-resolution sequence stratigraphic correlation based on drilling, logging, and seismic data has divided the Paleogene (E32)-Neogene (N1-N21) strata of the northern Qaidam Basin into six fourth-order sequences and 27 fifth-order sequences. The fifth-order sequences correspond to sandstone groups (sections where river channels are concentrated). Using the fifth-order sequences as mapping units, detailed channel sandbody correlations were performed within an isochronous stratigraphic framework. These maps laid the foundation for river channel classification and mapping research.

[0068] In some optional embodiments, identifying different types of river channel characteristics through combined well-seismic calibration includes:

[0069] The channel width, sand body thickness, amplitude intensity and bright spot brightness are analyzed through forward modeling; the differences in bright spot characteristics of different types of channel sand bodies are clarified through comprehensive analysis of the sedimentary characteristics of the channel sand bodies and the seismic response characteristics.

[0070] Specifically, through combined well-seismic calibration, it was determined that the seismic waveform characteristics of channel sand bodies are characterized by low frequency and strong amplitude, while zero-phase seismic profiles show a single valley and single peak reflection, exhibiting a "bright spot" response. Forward modeling revealed that the wider the channel and the thicker the sand body, the stronger the amplitude and the brighter the bright spot. A comprehensive analysis of the sedimentary characteristics and seismic response of channel sand bodies revealed distinct differences in the "bright spot" characteristics of different types of channel sand bodies. Among them, braided river sand bodies are primarily composed of conglomerate and coarse sandstone, distributed in overlapping and continuous areas on the plane, lack a fixed channel, have a large cumulative thickness, and exhibit long widths and strong amplitudes in seismic reflections. Meandering river sand bodies are primarily composed of gravelly sandstone and medium-fine sandstone, with relatively fixed channels and thick individual layers. Seismic reflections exhibit medium-low widths and strong amplitudes. Reticulated river sand bodies are primarily composed of fine-siltstone, with frequent channel changes and thin individual layers. Seismic reflections exhibit low widths and strong amplitudes.

[0071] In S105 of the present invention, targeted seismic data acquisition and processing improves the accuracy of river channel seismic imaging; it should be noted that, by applying new technologies and methods to various types of river channel sand bodies during seismic data acquisition and processing, good seismic data can be obtained, thereby laying a data foundation for the study of the spatiotemporal distribution of various types of river channels; in the acquisition, small combinations + nodes + long-arranged observations + low-frequency combination excitations are used to enhance the reflection energy of the top and bottom surfaces of the river channel, and small-surface high-density wide-azimuth observations further improve the spatial sampling density and the accuracy of river channel imaging; in the processing, high-fidelity pre-stack denoising is performed under the guidance of the "six-point method", and the subtraction method is preferably used to protect the effective signals at the high and low frequency ends and maintain the reflection characteristics of the river channel; high-resolution processing technologies such as surface Q compensation are used to improve the accuracy of river channel imaging.

[0072] In some optional embodiments, the seismic data is comprehensively applied to depict the spatiotemporal distribution of channel sand bodies, including:

[0073] By tracking and interpreting river channel seismic "bright spots" under the constraints of an isochronous grid, the planar distribution characteristics of different types of river channels are determined;

[0074] Through isochronal seismic amplitude attribute slice analysis, the migration and evolution patterns of multiple types of river channels in different sedimentary periods are determined;

[0075] The spatiotemporal distribution of channel sand bodies is determined through multi-parameter reservoir inversion prediction based on well logging evaluation and rock physics modeling.

[0076] Specifically, the comprehensive application of seismic data can more efficiently carry out the study of the spatiotemporal distribution of river channel sand bodies: by tracking and interpreting the "bright spots" of river channel seismic under the constraints of an isochronous framework, the planar distribution characteristics of different types of river channels can be determined; by analyzing the amplitude attributes of isochronous seismic slices, the migration and evolution laws of multiple types of river channels in different sedimentary periods can be determined; and by multi-parameter reservoir inversion prediction based on well logging evaluation and rock physics modeling, the spatiotemporal distribution of river channel sand bodies can be finally determined.

[0077] A comprehensive analysis is conducted on the planar distribution characteristics of various types of channel sand bodies that are greatly affected by seasonal changes and have no fixed river channels, and favorable channel sand body development areas are divided through comprehensive evaluation.

[0078] The present invention provides a method and device for identifying and classifying seasonal non-fixed river channel sand bodies. This method overcomes the limitations and shortcomings of traditional methods, providing a favorable target for oil and gas exploration in areas with rapid paleo-sedimentary climate change and wide variations in provenance supply, and is more practical. The invention has the advantages of a simple structure, rational design, strong practicality, and low production cost.

[0079] Based on the same inventive concept, the present invention also provides a seasonal non-fixed river channel sand body identification and classification device, see Figure 3 ,include:

[0080] The first determination module 301 is used to determine the target river channel deposition period based on the paleoclimate environment and the provenance supply conditions, and to determine the river channel development type based on the target river channel deposition period;

[0081] The second determination module 302 is used to determine the river channel distribution pattern based on the paleo-geomorphic background analysis. The paleo-geomorphic background type is determined by analyzing the paleo-geomorphic background during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and the planar distribution characteristics of river channel sand bodies.

[0082] The first identification module 303 is used to establish an isochronous framework to constrain river channel identification based on sequence stratigraphic division;

[0083] The second identification module 304 is used to identify different types of river channel characteristics through joint well-seismic calibration, and clearly define the seismic waveform characteristics of river channel sand bodies as low frequency and strong amplitude;

[0084] The precision improvement module 305 is used for targeted seismic data acquisition and processing to improve the accuracy of river channel seismic imaging;

[0085] The sand body distribution characterization module 306 is used to characterize the spatiotemporal distribution of river channel sand bodies through comprehensive application of seismic data.

[0086] Based on the same inventive concept, the present invention also provides an electronic device 161, see Figure 4 , including a processor 164, a communication interface 165, a memory 162 and a communication bus, wherein the processor 164, the communication interface 165 and the memory 162 communicate with each other via the communication bus;

[0087] Memory 162 storing a computer program 163;

[0088] When the processor 164 executes the program stored in the memory 162, a method for identifying and classifying seasonal non-fixed channel sand bodies is implemented.

[0089] The communication bus mentioned above may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus may be divided into an address bus, a data bus, a control bus, etc.

[0090] The communication interface 165 is used for communication between the electronic device 161 and other devices.

[0091] The memory 162 may include a random access memory 162 (RAM) or a non-volatile memory 162, such as at least one disk storage 162. Alternatively, the memory 162 may be at least one storage device located away from the processor 164.

[0092] The above-mentioned processor 164 can be a general-purpose processor 164, including a central processing unit 164 (CPU), a network processor 164 (NP), etc.; it can also be a digital signal processor 164 (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0093] Based on the same inventive concept, the present invention further provides a computer-readable storage medium storing a computer program 163 , which, when executed by a processor 164 , implements a method for identifying and classifying seasonal non-fixed channel sand bodies.

[0094] The computer-readable storage medium may be included in the device / apparatus described in the above embodiments, or may exist independently without being incorporated into the device / apparatus. The computer-readable storage medium carries one or more programs that, when executed, implement the seasonal non-fixed channel sand body identification and classification method according to the embodiments of the present disclosure.

[0095] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for identifying and classifying seasonal non-fixed river channel sand bodies, characterized in that: include: Determine the target river channel deposition period based on the paleoclimate environment and provenance supply conditions, and clarify the river channel development type through the target river channel deposition period; The river channel distribution pattern is determined by paleo-geomorphic background analysis, and the paleo-geomorphic background type is determined by paleo-geomorphic background analysis during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and the plane distribution characteristics of river channel sand bodies. Establishing an isochronous framework based on sequence stratigraphic divisions to constrain river channel identification; Through the joint calibration of well and seismic data, the characteristics of different types of river channels are identified, and it is clearly stated that the seismic waveform characteristics of river channel sand bodies are low frequency and strong amplitude; Targeted seismic data acquisition and processing improves the accuracy of river channel seismic imaging; The temporal and spatial distribution of channel sand bodies is depicted through comprehensive application of seismic data.

2. The method according to claim 1, characterized in that Determining the target river channel deposition period based on paleoclimatic environment combined with provenance supply conditions includes: Determine the river channel deposition period through clay mineral analysis and identification of typical climate indicator minerals such as gypsum and rock salt; Among them, by analyzing the characteristics of light and heavy minerals and ancient water flows, the source system of river development is clarified; by dissecting typical drilling wells to obtain the differences in the supply capacity of the source system, the formation of different types of river systems is controlled.

3. The method according to claim 1, characterized in that The paleogeomorphic background includes: Three types of paleo-geomorphological settings: paleo-uplift, paleo-slope and paleo-depression; Among them, the cumulative sand body thickness greater than 50 meters is determined to be the ancient uplift landform background, the single-layer sand body thickness greater than 50 meters is determined to be the ancient slope landform background, and the single-layer sand body thickness less than 10 meters is determined to be the ancient slope landform background.

4. The method according to claim 1, wherein The establishment of an isochronous framework to constrain river channel identification based on sequence stratigraphic division includes: The high-resolution comparison of drilling, logging and seismic data was used to divide the stratigraphic units into multiple fourth-order and fifth-order sequences, and the fifth-order sequences were used as mapping units to conduct fine channel sand body comparison within the isochronous stratigraphic framework.

5. The method according to claim 1, wherein The identification of different types of river channel characteristics through combined well-seismic calibration includes: The channel width, sand body thickness, amplitude intensity and bright spot brightness are analyzed through forward modeling; the differences in bright spot characteristics of different types of channel sand bodies are clarified through comprehensive analysis of the sedimentary characteristics of the channel sand bodies and the seismic response characteristics.

6. The method according to claim 1, wherein The comprehensive application of seismic data to depict the spatiotemporal distribution of channel sand bodies includes: By tracking and interpreting river channel seismic "bright spots" under the constraints of an isochronous grid, the planar distribution characteristics of different types of river channels are determined. Through isochronal seismic amplitude attribute slice analysis, the migration and evolution patterns of multiple types of river channels in different sedimentary periods are determined; The spatiotemporal distribution of channel sand bodies is determined through multi-parameter reservoir inversion prediction based on well logging evaluation and rock physics modeling.

7. The method according to claim 1 or 6, characterized in that include: A comprehensive analysis is conducted on the planar distribution characteristics of various types of channel sand bodies that are greatly affected by seasonal changes and have no fixed river channels, and favorable channel sand body development areas are divided through comprehensive evaluation.

8. A seasonal non-fixed river channel sand body identification and classification device, characterized in that: include: The first determination module is used to determine the target river channel deposition period based on the paleoclimate environment and the provenance supply conditions, and to clarify the river channel development type through the target river channel deposition period; The second determination module is used to determine the river channel distribution pattern based on the paleo-geomorphic background analysis. The paleo-geomorphic background type is determined by analyzing the paleo-geomorphic background during the sedimentary period. Different paleo-geomorphic backgrounds control the formation of different river types and the plane distribution characteristics of river channel sand bodies. The first identification module is used to establish an isochronous framework to constrain river channel identification based on sequence stratigraphic division; The second identification module is used to identify the characteristics of different types of river channels through joint well-seismic calibration, clearly defining the seismic waveform characteristics of river channel sand bodies as low-frequency and high-amplitude; Precision improvement module, used for targeted seismic data acquisition and processing to improve the accuracy of river channel seismic imaging; The sand body distribution characterization module is used to characterize the spatiotemporal distribution of river channel sand bodies through the comprehensive application of seismic data.

9. An electronic device, characterized in that: include: A processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; a memory storing a computer program; The processor, when executing the program stored in the memory, implements the seasonal non-fixed river channel sand body identification and classification method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that A computer program is stored, and when the computer program is executed by a processor, the seasonal non-fixed river channel sand body identification and classification method according to any one of claims 1 to 7 is implemented.

Images