Stratum overlap line identification method based on NEWS system and storage medium

Abstract

The application provides a stratum overlap line identification method based on a NEWS system and a storage medium. The identification method comprises the following steps: collecting logging data of all wells in a study area, and performing single-well geology comprehensive interpretation on a target well section in the study area; performing synthetic seismogram calibration on the target well section in the study area, and determining an accurate position of a target layer; establishing a reservoir development mode and a main control factor of the target layer through multi-well stratum correlation analysis; and comprehensively identifying and depicting an overlap boundary through fine structure interpretation. The application provides a stratum overlap line identification method and process based on the NEWS system, which can improve the description precision of the overlap line, and can also fully utilize the geophysical software product with independent intellectual property rights to improve the stratum overlap line identification efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of seismic exploration, and particularly relates to a stratum overlap line identification method based on a NEWS system and a storage medium. BACKGROUND

[0002] The development of oil and gas exploration interpretation software has developed from single structure interpretation software to comprehensive interpretation software integrating structure interpretation, stratum interpretation, seismic attribute analysis, reservoir comprehensive characterization (oil and gas reservoir description) and other multi-disciplinary methods and technologies, and various auxiliary interpretation technologies are constantly being improved and matured. From the development history of oil and gas exploration comprehensive interpretation software at home and abroad, the development of computer technology will play a crucial role in the future development of oil and gas exploration comprehensive interpretation software.

[0003] The Nanjing Petroleum Geophysical Exploration Institute of the Research Institute of Petroleum Exploration and Production of SINOPEC has, for more than ten years, combined related research results with advanced software development technology, relying on the SINOPEC scientific research project "Development and Research of Oil and Gas Exploration Comprehensive Interpretation System", and successfully developed the NEWS oil reservoir comprehensive interpretation system. The NEWS oil reservoir comprehensive interpretation system is a set of functions integrating comprehensive data management, pre-stack / post-stack seismic data comprehensive interpretation, well data comprehensive interpretation, development reservoir fine description and geological result map production, and provides an integrated comprehensive research platform for the comprehensive application of multi-disciplinary data such as seismic, geological, logging and testing. The NEWS oil reservoir comprehensive interpretation system has entered the stage of software popularization and application, and has been popularized to dozens of units of SINOPEC, PetroChina and colleges and universities.

[0004] At present, the NEWS oil reservoir comprehensive interpretation system has been applied in many research areas in China, and good application results have been achieved. For research areas where the main types of oil reservoirs are stratum-lithology reservoirs and structure-lithology reservoirs, the exploration focus is to implement the overlap pinchout zone. How to effectively identify the stratum overlap line based on the NEWS oil reservoir comprehensive interpretation system is urgently needed in the field. SUMMARY

[0005] The purpose of the present application is to propose a method for effectively identifying the overlap boundary based on the NEWS comprehensive interpretation system of SINOPEC's independent intellectual property rights. On the basis of fine calibration of the synthetic record, multi-well comprehensive correlation is carried out to determine the reservoir development pattern; and the seismic data is processed by various geophysical technology means to accurately depict the overlap boundary. The method can effectively improve the accuracy of the overlap pinchout line description; and can also accelerate the practical process of geophysical software products with independent intellectual property rights.

[0006] The application provides a stratum overlap line identification method based on a NEWS oil reservoir comprehensive interpretation system.

[0007] According to one aspect of the application, a stratum overlap line identification method based on a NEWS system is provided, comprising:

[0008] Collecting logging data of all wells in a research area, and performing single-well geological comprehensive interpretation on target well sections in the area;

[0009] Performing synthetic seismogram calibration on the target well sections in the area, and determining accurate positions of the target layers;

[0010] Through multi-well stratum comparison and analysis, a reservoir development pattern and main control factors of the target layers are established;

[0011] Through fine structure interpretation, the super stripping boundary is comprehensively identified and described.

[0012] Further, the single-well geological comprehensive interpretation of the target well sections is performed by using a single-well interpretation module in the NEWS oil reservoir comprehensive interpretation system.

[0013] Further, the layer calibration module of the NEWS system is used to make synthetic seismograms, and calibrate the target layers in the research area on the seismic profiles.

[0014] Further, the method further comprises: establishing a corresponding relationship between the well data and the seismic data, and determining accurate positions of the main target layers and regional marker layers.

[0015] Further, before making the synthetic seismograms, the accuracy of the input acoustic logging curves and density logging curves is analyzed and corrected, so as to ensure the correctness of the calculated reflection coefficients.

[0016] Further, according to the target layer reservoir characteristics and the lithology of the upper and lower strata obtained through the synthetic seismogram calibration, multi-well stratum comparison and analysis are performed, the relationship between the target layer logging characteristics and the seismic response is established, the reservoir development pattern and the main control factors of the target layers are determined.

[0017] Further, on the basis of the multi-scale fracture system seismic attribute processing and the wavelet transform-based seismic frequency extension and frequency division processing of the seismic data, fine structure interpretation is performed.

[0018] Further, the seismic data preprocessing and seismic attribute module in the NEWS system are used to perform the multi-scale fracture system seismic attribute processing and the wavelet transform-based seismic frequency extension and frequency division processing of the seismic data.

[0019] Further, the single-well geological comprehensive interpretation includes geological horizons, lithology, sedimentary facies, reservoirs and sedimentary cycles.

[0020] According to another aspect of the present application, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the method for identifying a stratigraphic overlap line.

[0021] The present application provides a method and a process for identifying a stratigraphic overlap line based on a NEWS system, which can improve the description accuracy of the overlap line and improve the efficiency of identifying the stratigraphic overlap line by using the geophysical software product with independent intellectual property rights. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views.

[0023] Figure 1 A flow chart of the method for identifying a stratigraphic overlap line based on a NEWS reservoir comprehensive interpretation system of the present application. DETAILED DESCRIPTION

[0024] Preferred embodiments of the present application will be described herein below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so as to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0025] The present method will utilize the NEWS reservoir comprehensive interpretation system with independent intellectual property rights to provide a method for identifying a stratigraphic overlap line based on a NEWS system, which can accurately depict the boundary of the overlap line and improve the accuracy of the overlap line interpretation. The method has guiding significance for the description of stratigraphic-lithologic and structural-lithologic reservoirs in a study area and the deployment of exploration targets.

[0026] As shown in Figure 1 The present application provides a method for identifying a stratigraphic overlap line based on a NEWS system, which includes:

[0027] Collecting logging data of all wells in a study area, and performing single-well geological comprehensive interpretation on target well sections in the area;

[0028] Performing synthetic seismogram calibration on the target well sections in the area to determine the accurate positions of the target layers;

[0029] Establishing a reservoir development pattern and main control factors of the target layers through multi-well stratigraphic correlation analysis;

[0030] Through fine structure interpretation, the super-unclap boundary is identified and described.

[0031] Specifically, first, the logging data of all wells in the study area is collected, and the single-well geological comprehensive interpretation of the target well section is performed by using the single-well interpretation module in the NEWS reservoir comprehensive interpretation system, including geological horizon, lithology, sedimentary facies, reservoir, and sedimentary cycle.

[0032] Optionally, before the synthetic seismic record is made, the accuracy of the input acoustic logging curve and density logging curve must be analyzed and corrected as necessary to ensure the correctness of the calculated reflection coefficient.

[0033] Next, the high-precision synthetic seismic record is made by using the horizon calibration module of the NEWS system, the target layer of the study area can be calibrated on the seismic profile, and the accurate corresponding relationship between the well data and the seismic data is established to determine the accurate positions of the main target layer and the regional marker layer.

[0034] Next, according to the geological data such as the reservoir characteristics of the target layer and the lithology of the upper and lower strata understood from the fine synthetic record calibration, the multi-well stratigraphic correlation analysis is performed to establish a reasonable relationship between the logging characteristics of the target layer reservoir and the seismic response. Since the development and distribution range of the strata-lithology and structure-lithology reservoirs is mainly controlled by the paleogeomorphology, the paleostructure is restored through stratigraphic isochronal correlation and the like on the basis of the regional sedimentary background research, the reservoir development pattern and the main controlling factors of the target layer are determined, the favorable facies belt distribution is analyzed, and the fine structural horizon interpretation is more convenient under the control of the favorable facies belt.

[0035] Finally, the seismic data is processed for multi-scale fracture system description and seismic attribute processing, and the distribution of the fracture system of the target layer can be clearly described; due to the resolution capability of the seismic data, the super-unclap boundary of the strata is generally difficult to identify, the seismic data of the target layer band is widened by using the seismic frequency widening technology based on wavelet transform to improve the resolution of the seismic data, the real ability of the seismic data to reflect the details of the thin layer is further improved, and the waveform information reflecting the super-unclap boundary is identified; then, the frequency division processing attribute analysis is performed by using the widened frequency body, a series of seismic data bodies with different main frequencies are generated, the reservoir corresponding relationship is determined by using the well-seismic combination, the frequency division data suitable for the work area are found, the seismic response characteristics of the target layer are more clearly found, the wave group characteristics are more obvious, and the horizon and sand body tracking interpretation are more beneficial. On this basis, the fine structural interpretation of the target layer is performed, the position of the super-unclap boundary of the target layer is accurately described, and a solid foundation is laid for fine reservoir prediction.

[0036] Optionally, some blocks need to preprocess seismic data, generally using the seismic data preprocessing and seismic attribute module in the NEWS system to perform multi-scale fracture system characterization, seismic attribute processing and wavelet transform-based seismic frequency extension and frequency division processing on the seismic data.

[0037] To facilitate understanding of the scheme and effects of the embodiments of the present application, a specific application example is given below. Those skilled in the art should understand that the example is only for facilitating understanding of the present application, and any specific details thereof are not intended to limit the present application in any way.

[0038] Example 1

[0039] The present application proposes a stratum overlap line identification method based on a NEWS system, which utilizes the NEWS comprehensive interpretation system of Sinopec's independent intellectual property rights to provide a basic well-seismic combination-based stratum overlap line identification process.

[0040] The steps of the present embodiment are as follows:

[0041] 1: Collecting logging data of all wells in the study area, performing single-well geology comprehensive interpretation on the target well section in the area;

[0042] 2: Performing fine synthetic record calibration on the target well section in the area to determine the accurate position of the target layer;

[0043] 3: Through multi-well stratum correlation analysis, establishing the reservoir development pattern and main control factors of the target layer;

[0044] 4: On the basis of multi-scale fracture system characterization seismic attribute processing and wavelet transform-based seismic frequency extension and frequency division processing on the seismic data, performing fine structure interpretation to comprehensively identify and characterize the super stripping boundary.

[0045] Example 2

[0046] The present disclosure provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the stratum overlap line identification method.

[0047] The computer readable storage medium according to the embodiments of the present disclosure stores non-transitory computer readable instructions. When the non-transitory computer readable instructions are run by a processor, all or part of the steps of the method of the embodiments of the present disclosure are executed.

[0048] The above computer-readable storage medium includes, but is not limited to, an optical storage medium (for example, a CD-ROM and a DVD), a magneto-optical storage medium (for example, an MO), a magnetic storage medium (for example, a magnetic tape or a magnetic hard disk), a medium having a built-in rewritable nonvolatile memory (for example, a memory card), and a medium having a built-in ROM (for example, a ROM cartridge).

[0049] Those skilled in the art will understand that the above description of the embodiments of the present application is given for the purpose of exemplarily illustrating the advantageous effects of the embodiments of the present application, and is not intended to limit the embodiments of the present application to any of the examples given.

[0050] The above has described the embodiments of the present application, and the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for identifying a stratigraphic overlap line based on a NEWS system, characterized by, The method comprises: collecting logging data of all wells in the research area, and performing single-well geological comprehensive interpretation on target well sections in the area; wherein the single-well interpretation module in the NEWS oil reservoir comprehensive interpretation system is used to perform single-well geological comprehensive interpretation on the target well sections; performing synthetic seismogram calibration on the target well sections in the area to determine the accurate positions of the target layers; wherein the horizon calibration module in the NEWS system is used to make synthetic seismograms, and calibrate the target layers in the research area on the seismic profiles; through multi-well stratigraphic correlation analysis, a reservoir development pattern and main controlling factors of the target layers are established; on the basis of multi-scale fault system delineation, seismic attribute processing based on seismic data pre-processing and seismic attribute modules in the NEWS system, wavelet transform-based seismic up-conversion and frequency division processing, fine structure interpretation is performed, and super-unwrapping boundaries are comprehensively identified and delineated.

2. The method of claim 1, wherein, The method further comprises: establishing a corresponding relationship between well data and seismic data, and determining the accurate positions of main target layers and regional marker layers.

3. The method of claim 1, wherein, Before making synthetic seismograms, the accuracy of input acoustic logging curves and density logging curves is analyzed and corrected to ensure the correctness of calculated reflection coefficients.

4. The method of claim 1, wherein, According to the target layer reservoir characteristics and lithology of upper and lower strata obtained through synthetic seismogram calibration, multi-well stratigraphic correlation analysis is performed, the relationship between well logging characteristics and seismic responses of the target layers is established, the reservoir development pattern and main controlling factors of the target layers are determined.

5. The method of claim 1, wherein, The single-well geological comprehensive interpretation includes geological horizons, lithology, sedimentary facies, reservoirs, and sedimentary cycles.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the stratigraphic overlap line identification method in any one of claims 1-5.

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