Quantitative division method for land-lake source-sink system

Abstract

The invention relates to a land-lake-source-sink system quantitative division method, which comprises the following steps: S1, according to an area structure background and stratigraphic distribution characteristics of a to-be-researched area in a land-lake-source-sink system, identifying a material source area in the to-be-researched area; s2, determining lithology distribution of bedrock in the material source area, and setting a weathering coefficient representing weathering resistance according to the lithology of the bedrock; s3, restoring the denudation landform of the provenance area; s4, correcting the range of the source area according to the denudation landform, and counting the volume of an effective source; s5, according to the logging core data and the seismic facies characteristics in the to-be-researched area, dividing the source area into a plurality of source-sink units in combination with the recovered denudation landform; s6, depicting the distribution characteristics of the paleo-water system of the source area, and determining the conveying coefficient of the paleo-water system; and S7, calculating a comprehensive index of each source-sink unit according to the weathering coefficient, the volume of the effective material source and the transmission coefficient of the paleowater system, and performing level division on the source-sink units.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration and development, and in particular to a quantitative division method of a land-lake source-sink system. Background Art

[0002] Continental lake basins are important oil and gas accumulation zones in my country's offshore areas. For deep lakes and depression basins in continental-lake fault zones, the refined and quantitative classification and optimization of source-sink systems are the next research trends of source-sink systems.

[0003] Traditional methods mainly focus on qualitative analysis of the supply characteristics and valley distribution characteristics of the provenance area, lacking quantitative means, and the comparison of source-sink systems at different levels also lacks quantitative basis and support. How to effectively and precisely characterize the provenance supply area has always been a major problem that has troubled researchers. Summary of the invention

[0004] The present invention provides a method for quantitatively dividing a land-lake source-sink system. The method can fully consider the material supply capacity of the provenance area and its transportation capacity to the sedimentation area and its influence on the sedimentation system, and accurately and conveniently perform quantitative optimization and division of the land-lake source-sink system.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for quantitatively dividing a land-lake source-sink system, the method comprising:

[0007] S1, according to the regional tectonic background and stratigraphic distribution characteristics of the area to be studied in the land-lake source-sink system, identify the provenance area;

[0008] S2, determine the bedrock lithology distribution in the provenance area, and set the weathering coefficient that characterizes the weathering resistance according to the bedrock lithology;

[0009] S3, restore the erosional landforms in the provenance area;

[0010] S4, correct the scope of the provenance area according to the erosion landform and calculate the effective provenance volume;

[0011] S5, based on the well logging core data and seismic facies characteristics in the area to be studied, combined with the restored erosion landforms, the provenance area is divided into multiple source-sink units;

[0012] S6, characterize the distribution characteristics of the paleo-river system in the provenance area and determine the paleo-river system transport coefficient;

[0013] S7, calculate the comprehensive index of each source-sink unit based on the weathering coefficient, effective source volume and paleo-river transport coefficient, and divide the source-sink units into different levels.

[0014] In one implementation, in S2, the main lithology and distribution characteristics of the bedrock in the provenance area are identified, and corresponding weathering coefficients are given according to the weathering resistance corresponding to different rock types.

[0015] In one implementation, in S3, the erosional landform of the provenance area is restored by a prototype basin restoration method based on sedimentary boundary constraints.

[0016] In one implementation, the step S6 identifies the distribution characteristics of the ancient water system in the provenance supply area and the provenance transport area, and assigns corresponding transport coefficients according to the morphology and characteristics of the water system development.

[0017] In one implementation, the method S7 uses the following formula to calculate the comprehensive index of each source-sink unit:

[0018] Imdex YH =V×K E ×W

[0019] Among them, Index YH is the comprehensive index, V is the effective source volume, K E is the weathering coefficient, and W is the paleo-river transport coefficient.

[0020] In a second aspect, the present application provides a computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to control a device where the processor is located to implement the method for quantitative division of the land-lake source-sink system described in the first aspect.

[0021] In a third aspect, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the quantitative optimization method for the land-lake source-sink system described in the first aspect are implemented.

[0022] The technical solution of the present invention is based on quantitative optimization of the land-lake source-sink system, fully considering the material supply capacity of the provenance area and its transportation capacity to the sedimentary area and its influence on the sedimentary system, and accurately and conveniently performs quantitative optimization and division of the land-lake source-sink system, laying a foundation for in-depth research and detailed dissection of the sedimentary bodies in the source-sink system, and providing an important basis for oil and gas exploration deployment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of the quantitative division method of the land-lake source-sink system in the embodiment of the present application;

[0024] Figure 2 It is the comprehensive index of different source-sink units in the study area in the embodiment of this application;

[0025] Figure 3This is a result diagram of the quantitative division of the source-sink system of the study area in the embodiment of this application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0027] In view of the defects and problems of the prior art, the present application provides a method for quantitatively dividing a land-lake source-sink system, the method comprising:

[0028] S1, according to the regional tectonic background and stratigraphic distribution characteristics of the area to be studied in the land-lake source-sink system, identify the provenance area;

[0029] S2, determine the bedrock lithology distribution in the provenance area, and set the weathering coefficient that characterizes the weathering resistance according to the bedrock lithology;

[0030] S3, restore the erosional landforms in the provenance area;

[0031] S4, correct the scope of the provenance area according to the erosion landform and calculate the effective provenance volume;

[0032] S5, based on the well logging core data and seismic facies characteristics in the area to be studied, combined with the restored erosion landforms, the provenance area is divided into multiple source-sink units;

[0033] S6, characterize the distribution characteristics of the paleo-river system in the provenance area and determine the paleo-river system transport coefficient;

[0034] S7, calculate the comprehensive index of each source-sink unit based on the weathering coefficient, effective source volume and paleo-river transport coefficient, and divide the source-sink units into different levels.

[0035] The above method flow is described in more detail in the following embodiments in conjunction with the accompanying drawings of the present invention.

[0036] like Figure 1 , a flow chart of a method for quantitatively dividing a land-lake source-sink system is provided, the method comprising:

[0037] S1. Characterization of existing provenance areas.

[0038] Based on the regional tectonic background and stratigraphic distribution characteristics, identify the existing provenance areas in the source-sink system and characterize their sedimentary boundaries;

[0039] S2. Given weathering coefficient.

[0040] Based on the experimental data of drilling cores, thin sections and zircons, the lithology distribution characteristics of the bedrock in the source area are clarified and the corresponding weathering coefficient is given.

[0041] S3. Restoration of eroded landforms.

[0042] The prototype basin restoration method based on high-precision sedimentary boundary constraints is used to restore the erosional landforms in the provenance area.

[0043] S4. Statistics of effective source area.

[0044] According to the results of denudation landform restoration, the scope of the provenance area is re-delineated and the effective provenance volume is counted.

[0045] S5. Divide the source and sink units.

[0046] According to the logging core and seismic facies characteristics, combined with the restored erosional landforms, the study area is divided into four source-sink units.

[0047] S6. Given the transport coefficient.

[0048] The distribution characteristics of the ancient river system are characterized based on the elevation data of the source area, and the corresponding transport coefficients are given for the four source-sink units respectively.

[0049] S7. Calculate the composite index.

[0050] According to the division of the four source-sink units, the effective source volume, weathering coefficient and transport coefficient are counted respectively, and the comprehensive index of different source-sink units is calculated ( Figure 2 ), and divide them into different levels to characterize and describe different source-sink system units ( Figure 3 ).

[0051] In another embodiment, this embodiment provides a source-sink system quantitative division system. The source-sink system quantitative division system provided in this embodiment can implement the aforementioned source-sink system quantitative division method, and the system can be implemented by software, hardware, or a combination of software and hardware. For example, the selection system may include integrated or separate functional modules or functional units to execute the corresponding steps in each method of Example 1. Since the source-sink system quantitative division system of this embodiment is basically similar to the method embodiment, the description process of this embodiment is relatively simple, and the relevant parts can be partially described in the method embodiment. The source-sink system quantitative division system of this embodiment is merely schematic.

[0052] The embodiment of the present application also provides a device. The device may be a processing device for a client, such as a mobile phone, a laptop, a tablet computer, a desktop computer, etc., to execute the source-sink system quantitative partitioning method.

[0053] The processing device includes a processor, a memory, a communication interface and a bus, and the processor, the memory and the communication interface are connected through the bus to complete mutual communication. The memory stores a computer program that can be run on the processor, and the processor executes the source-sink system quantitative partitioning system when running the computer program.

[0054] Preferably, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0055] Preferably, the processor may be a central processing unit (CPU), a digital signal processor (DSP) or other general-purpose processors of various types, which are not limited here.

[0056] In summary, the technical scheme of the present invention, based on the quantitative optimization method of land-lake source-sink system, fully considers the material supply capacity of the provenance area and its transportation capacity to the sedimentary area and its influence on the sedimentary system, and accurately and conveniently performs quantitative optimization and division of the land-lake source-sink system, laying the foundation for in-depth research and fine dissection of sedimentary bodies in the source-sink system, and providing an important basis for oil and gas exploration deployment.

[0057] In the several embodiments provided by the present invention, it should be understood that the disclosed method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0058] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (Processor) to perform some steps of the above-mentioned method of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quantitative division method of land-lake source-sink system, characterized in that: The method comprises: S1, according to the regional tectonic background and stratigraphic distribution characteristics of the area to be studied in the land-lake source-sink system, identify the provenance area; S2, determine the bedrock lithology distribution in the provenance area, and set the weathering coefficient that characterizes the weathering resistance according to the bedrock lithology; S3, restore the erosional landforms in the provenance area; S4, correct the scope of the provenance area according to the erosion landform and calculate the effective provenance volume; S5, based on the well logging core data and seismic facies characteristics in the area to be studied, combined with the restored erosion landforms, the provenance area is divided into multiple source-sink units; S6, characterize the distribution characteristics of the paleo-river system in the provenance area and determine the paleo-river system transport coefficient; S7, calculate the comprehensive index of each source-sink unit based on the weathering coefficient, effective source volume and paleo-river transport coefficient, and divide the source-sink units into different levels.

2. The quantitative division method of land-lake source-sink system according to claim 1 is characterized in that: In S2, the main lithology and distribution characteristics of the bedrock in the source area are identified, and the corresponding weathering coefficient is given according to the weathering resistance corresponding to different rock types.

3. The quantitative division method of land-lake source-sink system according to claim 1 is characterized in that: In S3, the erosional landform of the provenance area is restored by a prototype basin restoration method based on sedimentary boundary constraints.

4. The quantitative division method of land-lake source-sink system according to claim 1 is characterized in that: The S6 is to identify the distribution characteristics of the ancient water system in the source supply area and the source transport area, and to give the corresponding transport coefficient according to the morphology and characteristics of the water system development.

5. The quantitative division method of land-lake source-sink system according to claim 4 is characterized in that: The method S7 uses the following formula to calculate the comprehensive index of each source-sink unit: Index YH =V×K E ×W Among them, Index YH is the comprehensive index, V is the effective source volume, K E is the weathering coefficient, and W is the paleo-river transport coefficient.

6. A computer-readable storage medium, characterized in that: A computer program is stored, and the computer program is executed by a processor to control the device where the processor is located to implement the land-lake source-sink system quantitative division method as described in any one of claims 1 to 5.

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