Oil reservoir logging identification method and system based on ancient landform analysis constraint

Abstract

The invention provides an oil reservoir logging identification method and system based on ancient landform analysis constraint, and the method comprises the steps: reconstructing an ancient landform feature map of a target region according to the obtained geological deposition environment information of the target region, drawing an ancient landform unit distribution map in the target region, and obtaining an ancient landform unit distribution map in the target region according to the ancient landform unit distribution map in the target region; determining the type of an ancient landform unit where the well is located; according to the logging data, an oil-water layer is preliminarily identified, an oil layer and a water layer are divided, and an oil layer preliminary identification result is obtained; and according to the type of the ancient landform unit where the logging is located, obtaining landform features of the ancient landform unit, and optimizing the preliminary recognition result of the oil reservoir to obtain an oil reservoir optimization recognition result. When the oil reservoir is identified, the oil reservoir influenced by the ancient landform can be identified more accurately by introducing the ancient landform analysis constraint, the conditions of false identification and missed identification are reduced, and the reliability and the stability of oil reservoir identification are improved.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration, and more specifically, to an oil layer logging identification method and system based on paleo-geomorphology analysis constraints. Background Art

[0002] Oil and natural gas are one of the most important energy sources in the world. The development of oil exploration and production technology plays a vital role in ensuring energy supply and promoting economic development. Reservoir exploration is one of the key links in the oil industry, and accurate identification of oil layers is a vital task in reservoir exploration. In the past few decades, with the advancement of exploration technology, oil layer logging technology has become one of the important means of oil exploration, especially in complex geological environments. Oil layer logging interpretation provides basic data for the development of oil and gas resources.

[0003] However, traditional reservoir logging technology has certain limitations in complex geological backgrounds, especially in areas where paleo-geomorphology controls the formation and distribution of reservoirs. Traditional reservoir identification methods mostly rely on logging curve data (such as resistivity, gamma rays, etc.), which usually ignore the impact of paleo-geomorphological features on reservoir distribution. In many cases, paleo-geomorphological features play a vital role in the distribution, reservoir properties and reservoir formation conditions of oil layers, especially in reservoirs with obvious paleo-geomorphological control, and traditional logging technology often cannot effectively capture this information.

[0004] Paleomorphology plays an important role in the development of oil reservoirs. The distribution of paleomorphic units affects reservoir properties such as sediment type, thickness, lithology and porosity, which directly affects the storage and distribution of oil and gas. Under some special paleomorphic conditions (such as incised valleys, alluvial fans, etc.), due to the particularity of the sedimentary environment and reservoir-forming conditions, the structure and distribution of oil reservoirs are highly heterogeneous and complex.

[0005] Especially in areas controlled by incised river valleys or other paleo-geomorphology, the distribution of oil layers is not only affected by lithological characteristics, but also strongly controlled by paleo-geomorphological units (such as river valleys, highlands, etc.). Therefore, it is difficult to accurately determine the location and distribution of oil layers and reveal the impact of paleo-geomorphology on oil layer development by relying solely on well logging curves and traditional lithology identification methods.

[0006] In a complex geological environment, the main technical challenges faced by oil layer identification include: (1) Low accuracy in oil layer identification: Traditional logging methods mainly rely on the interpretation of logging curves, and the morphological changes of these curves may be affected by a variety of geological factors, such as sedimentary environment, lithology, porosity, etc. In areas controlled by paleo-geomorphology, logging data often cannot fully reflect the true distribution of oil layers.

[0007] (2) It is difficult to comprehensively consider complex geological factors: Traditional well logging identification methods often ignore the complex geological background and historical evolution of the region, especially in areas controlled by paleo-geomorphology. Traditional methods find it difficult to effectively combine paleo-geomorphological characteristics with reservoir formation conditions, resulting in misjudgment or omission.

[0008] (3) Insufficient correlation between paleogeomorphology and reservoir properties: Paleogeomorphological features (such as river channel deposits, alluvial fans, etc.) have an important impact on the reservoir conditions of oil layers, but traditional oil layer logging technology fails to make full use of this information, resulting in the inability to accurately assess the reservoir properties and development potential of oil layers.

[0009] Conventional logging technology, with its rich data resources and high cost-effectiveness, plays a vital role in the interpretation and identification of oil and water layers. At present, logging technology generally covers three categories: digital logging (such as borehole compensation acoustic wave, neutron and formation density logging, etc.), CNC logging (natural potential, natural gamma, well diameter, vertical seismic profile and natural gamma spectrum logging, etc.) and imaging logging (nuclear magnetic resonance, borehole micro-electric scanning and acoustic imaging, array induction and azimuthal lateral logging, etc.). In the identification of oil and water layers, a combination of qualitative and quantitative methods is usually adopted. Qualitative analysis focuses on the longitudinal comparison and overlap plot method of single well logging curves, as well as the comprehensive comparison and intersection plot method of multi-well logging curves; while quantitative analysis relies on rock electrical experiments, using Archie formula calculations or logging signals such as nuclear magnetic resonance to accurately obtain oil (water) saturation. Summary of the invention

[0010] In oil reservoir development areas controlled by paleo-geomorphology, traditional logging identification methods do not take paleo-geomorphological factors into consideration, resulting in reduced accuracy and prone to misidentification or missed identification. Based on this, the present invention provides an oil layer logging identification method and system based on paleo-geomorphological analysis constraints.

[0011] According to a first aspect of the present invention, there is provided a method for oil layer logging identification based on paleo-geomorphological analysis constraints, comprising: Reconstructing a paleo-geomorphic feature map of the target area based on the collected geological sedimentary environment information of the target area, drawing a paleo-geomorphic unit distribution map in the target area, and determining the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area; Based on the logging data, the oil and water layers are preliminarily identified, and the oil and water layers are divided to obtain the preliminary identification results of the oil layers; According to the type of paleo-geomorphic unit where the well logging is located, the geomorphic characteristics of the paleo-geomorphic unit are obtained, and the preliminary identification result of the oil layer is optimized to obtain the optimized identification result of the oil layer.

[0012] Based on the above technical solution, the present invention can also make the following improvements.

[0013] Optionally, the step of reconstructing a paleo-geomorphic feature map of the target area based on the collected geological sedimentary environment information of the target area, and determining the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area, comprises: Obtain geological sedimentary environment information, tectonic background and paleo-geomorphological characteristics of the target area; Reconstructing the paleo-geomorphic features of the target area based on the geological sedimentary environment information, tectonic background, paleo-geomorphic features of the target area and the three-dimensional seismic data of the target area; Analyze the paleo-geomorphic types in different geological periods according to geological principles and draw the distribution map of paleo-geomorphic units; According to the paleo-geomorphic unit distribution map, each paleo-geomorphic unit in the target area is determined, and the type of paleo-geomorphic unit at the drilling location is obtained.

[0014] Optionally, the paleo-geomorphic unit types include at least terraces, slopes and inter-river hills.

[0015] Optionally, the oil-water layer is preliminarily identified based on the well logging data, and the oil layer and the water layer are divided to obtain a preliminary oil layer identification result, including: Preliminary division of oil and water layers based on drilling and logging data; According to the changing characteristics of the logging data curve, the distribution of oil and water layers is preliminarily determined; Determine the lithology of oil and water layers based on core data and logging data; By measuring the porosity and saturation of different lithology layers, the interface between the oil layer and the water layer is determined, and the oil layer is preliminarily identified; Based on the preliminary oil layer identification results, the potential oil layer areas in the target area are marked.

[0016] Optionally, the method of obtaining the geomorphic features of the paleomorphic unit according to the type of paleomorphic unit where the well logging is located, optimizing the preliminary oil layer identification result, and obtaining the optimized oil layer identification result includes: According to the type of paleo-geomorphic unit where the well is located, the geomorphic features of the paleo-geomorphic unit are analyzed to determine whether the initially identified oil layer area is in an area with favorable reservoir-forming conditions; If the initially identified oil layer area is located in a paleo-geomorphological unit with high porosity and good sealing, it is determined that the initially identified oil layer area is in an area with favorable reservoir forming conditions, and the reliability of the initial oil layer identification result is high and no optimization is required; On the contrary, if the initially identified oil layer area is in an area with unfavorable reservoir forming conditions, it is necessary to optimize the initial identification result of the oil layer; The optimization of the preliminary oil layer identification result includes: Based on the geomorphic features of the paleomorphic unit where the well is located as a constraint, the preliminarily identified oil layer area is screened as the optimized oil layer identification result.

[0017] Optionally, the method of screening the initially identified oil layer area based on the geomorphic features of the paleo-geomorphic unit where the well is located as a constraint, as the result of optimized oil layer identification, includes: Based on the geomorphic characteristics of the paleo-geomorphic unit where the well is located, the spatial distribution of the oil layer area and its accumulation conditions are confirmed, and the effective reservoir range of the oil layer area is delineated.

[0018] According to a second aspect of the present invention, there is provided an oil layer logging identification system based on paleo-geomorphological analysis constraints, comprising: A determination module is used to reconstruct a paleo-geomorphic feature map of the target area based on the collected geological sedimentary environment information of the target area, draw a paleo-geomorphic unit distribution map in the target area, and determine the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area; The preliminary identification module is used to perform preliminary identification of oil and water layers according to the well logging data, and to divide the oil layer and the water layer to obtain preliminary identification results of the oil layer; The optimization identification module is used to obtain the geomorphic characteristics of the paleo-geomorphic unit according to the type of paleo-geomorphic unit where the well logging is located, optimize the preliminary identification result of the oil layer, and obtain the optimized identification result of the oil layer.

[0019] The present invention provides a method and system for oil layer logging identification based on paleo-geomorphic analysis constraints. According to the collected geological sedimentary environment information of the target area, the paleo-geomorphic feature map of the target area is reconstructed, and the paleo-geomorphic unit distribution map in the target area is drawn. According to the paleo-geomorphic unit distribution map in the target area, the type of paleo-geomorphic unit where the drilling is located is determined; according to the logging data, the oil and water layers are preliminarily identified, and the oil layers and water layers are divided to obtain the preliminary identification result of the oil layer; according to the type of paleo-geomorphic unit where the logging is located, the geomorphic characteristics of the paleo-geomorphic unit are obtained, the preliminary identification result of the oil layer is optimized, and the optimized identification result of the oil layer is obtained. When the present invention identifies the oil layer, by introducing paleo-geomorphic analysis constraints, the oil layer affected by the paleo-geomorphic can be more accurately identified, the situation of misidentification and missed identification is reduced, and the reliability and stability of oil layer identification are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of an oil layer logging identification method based on paleo-geomorphological analysis constraints provided by the present invention; Figure 2 The distribution map of paleo-geomorphic units in the reconstructed target area; Figure 3 This is a schematic diagram of the boundary demarcation results for the oil layer and the water layer; Figure 4This is a schematic diagram of the single well logging interpretation results after the paleo-geomorphic unit is constrained; Figure 5 A schematic structural diagram of an oil layer logging identification system based on paleo-geomorphological analysis constraints provided by the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention can be arbitrarily combined with each other to form a feasible technical solution. This combination is not subject to the constraints of the sequence of steps and / or the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] In oil reservoir exploration, well logging technology is one of the commonly used detection methods for identifying oil and water layers. However, in complex geological environments, especially in oil reservoir development areas controlled by paleo-geomorphology, traditional well logging identification methods often have low accuracy in well logging identification due to changes in geological conditions or heterogeneity of strata, and are prone to misidentification or missed identification. Especially in oil reservoir development areas controlled by paleo-geomorphology, different types of paleo-geomorphology have a greater control over the distribution of oil layers, which often leads to increased complexity of oil layers. Therefore, there is an urgent need for a new oil layer logging identification method that can combine paleo-geomorphological feature constraints to improve the accuracy and reliability of logging identification, especially in oil reservoir areas controlled by paleo-geomorphology.

[0023] Figure 1 A flow chart of an oil layer logging identification method based on paleo-geomorphological analysis constraints provided by the present invention is as follows: Figure 1 As shown, the method includes: Step 1: reconstruct the paleo-geomorphic characteristic map of the target area based on the acquired geological sedimentary environment information of the target area, draw a paleo-geomorphic unit distribution map in the target area, and determine the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area.

[0024] In a possible embodiment of the present invention, the paleo-geomorphic characteristic map of the target area is reconstructed based on the collected geological sedimentary environment information of the target area, and the type of paleo-geomorphic unit where the well is located is determined based on the paleo-geomorphic unit distribution map in the target area, including: Obtain geological sedimentary environment information, tectonic background and paleo-geomorphic features of the target area; reconstruct the paleo-geomorphic features of the target area based on the geological sedimentary environment information, tectonic background, paleo-geomorphic features and three-dimensional seismic data of the target area; analyze the paleo-geomorphic types of different geological periods based on geological principles and draw a paleo-geomorphic unit distribution map; determine the various paleo-geomorphic units in the target area based on the paleo-geomorphic unit distribution map, and obtain the paleo-geomorphic unit type at the drilling location.

[0025] It is understandable that the ancient landforms in the target area are restored, and the distribution characteristics of the ancient landforms in the area are reconstructed using geological exploration data, seismic exploration data, ancient landform data and historical data. The specific operations of this step are as follows: Data collection: The sedimentary environment, tectonic background and paleo-geomorphological characteristics of the target area are obtained through drilling data, 3D seismic exploration data, core analysis and geological history data.

[0026] Paleogeomorphological restoration: Reconstruct the paleogeomorphological characteristics of the target area based on geological background information (such as changes in sedimentary environment, direction of ancient river channels, etc.) and combined with existing 3D seismic data. Use geological principles to analyze paleogeomorphological types of different geological periods (such as incised valleys, alluvial fans, ancient lakes, etc.) and draw a distribution map of paleogeomorphological units.

[0027] Paleomorphological unit determination: Paleomorphological units in the target area are determined based on the restored paleomorphological features. The paleomorphological unit where each well is located needs to be accurately identified and calibrated to provide geological background support for subsequent oil layer identification.

[0028] Step 2: Based on the well logging data, the oil and water layers are preliminarily identified, and the oil and water layers are divided to obtain the preliminary identification results of the oil layers.

[0029] In a possible implementation mode of the present invention, the oil and water layers are preliminarily identified based on the logging data, and the oil layers and water layers are divided to obtain a preliminary oil layer identification result, including: preliminarily dividing the oil and water layers based on the drilling and logging data; preliminarily determining the distribution of the oil layers and water layers based on the changing characteristics of the logging data curve; making lithological judgments on the oil layers and water layers based on the core data and the logging data; determining the interface between the oil layers and the water layers by measuring the porosity and saturation of different lithology layers, and preliminarily identifying the oil layers; and calibrating the potential oil layer areas in the target area based on the preliminary oil layer identification results.

[0030] In this step, the oil layer and water layer are preliminarily identified in combination with the well logging data. The specific operations are as follows: Well logging data analysis: Through qualitative and quantitative analysis of drilling and logging data (such as resistivity, gamma rays, acoustic time difference, density, impedance, etc.), preliminary division of oil and water layers is carried out. Then, according to the changing characteristics of the logging curve (such as high resistivity, low gamma rays, etc.), the distribution of oil and water layers is preliminarily judged.

[0031] Lithology and fluid property analysis: Combine core data and logging data to determine the lithology of oil and water layers. By measuring the porosity, saturation and other physical properties of different lithology layers, the interface between the oil and water layers is further determined, and the preliminary identification results of the oil and water layers are obtained.

[0032] Preliminary oil-water layer division: Based on the preliminary results of oil-water layer identification, potential oil layer areas are marked to provide a basis for subsequent analysis.

[0033] Step 3, according to the type of paleo-geomorphic unit where the well logging is located, the geomorphic characteristics of the paleo-geomorphic unit are obtained, and the preliminary identification result of the oil layer is optimized to obtain the optimized identification result of the oil layer.

[0034] In a possible embodiment of the present invention, the method of obtaining the geomorphic features of the paleomorphic unit according to the type of paleomorphic unit where the well logging is located, optimizing the preliminary oil layer identification result, and obtaining the optimized oil layer identification result includes: According to the type of paleomorphic unit where the drilling is located, the geomorphic features of the paleomorphic unit are analyzed to determine whether the initially identified oil layer area is in an area with favorable reservoir conditions; if the initially identified oil layer area is located in a paleomorphic unit with higher porosity and better sealing, it is determined that the initially identified oil layer area is in an area with favorable reservoir conditions, and the reliability of the initial oil layer identification result is high and no optimization is required; conversely, if the initially identified oil layer area is in an area with unfavorable reservoir conditions, the initial oil layer identification result needs to be optimized; wherein, the geomorphic features of the paleomorphic unit where the drilling is located are used as constraints to screen the initially identified oil layer area as the optimized oil layer identification result.

[0035] Among them, further paleo-geomorphic unit analysis is carried out on the initially identified oil layer area, and the characteristics of the paleo-geomorphic units are combined to optimize the oil layer identification. The specific steps are as follows: Analysis of the relationship between paleo-geomorphological units and oil layers: According to the types of paleo-geomorphological units and the development conditions of oil layers, the influence of paleo-geomorphology on oil layers is analyzed. Different types of paleo-geomorphological units often have different sedimentary characteristics and reservoir properties, which directly affect the distribution and reservoir performance of oil layers.

[0036] For example, inter-river hill paleo-geomorphology of incised river valleys and slope areas on both sides of the valleys usually have good conditions for reservoir development, while in other types of paleo-geomorphological units, the distribution of oil layers may be less.

[0037] Favorable reservoir-forming conditions determination: By analyzing the paleo-geomorphic units, it is determined whether the oil layer area is in an area with favorable reservoir-forming conditions. If the oil layer is located in a paleo-geomorphic unit with higher porosity and better sealing, the reliability of its identification result is higher, and there is no need to optimize the preliminary identification result of the oil layer; on the contrary, if the oil layer area is in a less favorable paleo-geomorphic unit, its reservoir-forming potential needs to be further analyzed.

[0038] Constraints of paleo-geomorphology on oil layer identification: Combined with the characteristics of paleo-geomorphological units, the oil layer areas that have been preliminarily identified are constrained to screen out the oil layer areas with the greatest development potential and economic value.

[0039] Finally, after paleo-geomorphic unit analysis and reservoir optimization identification, the final logging interpretation of the reservoir is carried out based on the constraints of paleo-geomorphic analysis. The specific operations are as follows: Reservoir interpretation optimization: By combining the preliminary identification results of oil and water layers with the analysis results of paleo-geomorphic units, the identification of oil layers is further optimized. The results of paleo-geomorphic analysis constraints are used to correct potential errors in traditional logging identification methods to ensure that the final oil layer distribution results are more accurate.

[0040] Confirmation of oil layer distribution and reservoir conditions: Based on paleo-geomorphological constraints, confirm the spatial distribution of oil layers and their reservoir conditions, and further define the effective reservoir range of the oil layers. The focus of this stage is to confirm whether the oil layer has sufficient reservoir properties and whether there are oil and gas accumulation conditions to ensure a solid foundation for subsequent development work.

[0041] The following is a specific implementation case of the oil layer logging identification method based on paleo-geomorphology analysis constraints of the present invention, as well as the effects and results after the implementation of the method.

[0042] This case is located in the ancient valley oil reservoir development area of ​​a certain oil field. The target area is an oil reservoir controlled by ancient landforms, with complex underground structures and complex oil and water distribution patterns in the reservoir. Traditional oil layer logging identification methods face challenges in this area. The complexity of geological conditions and the limitations of traditional methods lead to low accuracy in oil layer identification.

[0043] Case Study: Through a new oil layer logging identification method provided by the present invention, the accuracy of oil layer identification is improved, misidentification and missed identification are reduced, the efficiency of oil reservoir exploration is improved, and more reliable data support is provided for subsequent development decisions.

[0044] The implementation steps are as follows: Step 1: Paleogeomorphological restoration and determination of paleogeomorphological units in the target area.

[0045] Data collection: Detailed sedimentary environment information of the target area was collected through drilling data, 3D seismic data, core analysis, geological history data, etc. The reservoir sedimentary history of this area is complex, with tectonic uplift and valley incision.

[0046] Paleomorphological restoration: Based on the sedimentological and tectonic background of the target area, the paleomorphological characteristic map of the area was reconstructed using the paleomorphological restoration method. Figure 2 By analyzing drilling data and 3D seismic data, paleo-geomorphic units such as ancient river channels, terraces, slopes, and inter-river hills were identified, and a distribution map of paleo-geomorphic units in the region was drawn.

[0047] Determination of paleo-geomorphic units: Based on the restored paleo-geomorphic characteristic map, the types of paleo-geomorphic units where each well is located were identified. The paleo-geomorphic units of terraces, slopes, and riverside hills that are closely related to the distribution of oil layers were determined.

[0048] Step 2: Preliminary identification of oil and water layers.

[0049] Well logging data analysis: Use conventional well logging data (such as resistivity, gamma ray, acoustic time difference, etc.) to preliminarily identify the oil and water layers. By analyzing the well logging curve, the boundaries of the oil and water layers are preliminarily delineated. The demarcation results can be found in Figure 3 , and identified several potential oil-bearing areas.

[0050] Lithology and fluid property analysis: By comparing with core data, the lithology characteristics of the oil layer and water layer were further confirmed. The thickness and saturation of the oil layer were preliminarily determined by calculating the oil and gas saturation.

[0051] Step 3: Paleogeomorphological unit analysis and oil layer identification optimization.

[0052] Analysis of the relationship between paleo-geomorphic units and oil layers: Combined with the characteristics of paleo-geomorphic units, their influence on the development of oil layers was analyzed. It was found that in the incised valley area, the oil layers are mainly distributed in the slopes and inter-river hills of the ancient river channels, which have high porosity and good sealing properties. In contrast, the main river channel has poor reservoir formation conditions.

[0053] Determination of favorable reservoir-forming conditions: Through paleo-geomorphological analysis, it is determined that the ancient river channel area is the most favorable reservoir-forming unit, while other paleo-geomorphological units have problems of poor reservoir and poor sealing, which require further attention.

[0054] Optimizing oil layer identification: Based on the constraints of paleo-geomorphic units, the identification of oil layers was further optimized, the distribution range of major oil layers was clarified, the areas with favorable paleo-geomorphic development were investigated in particular, and non-oil layer areas were excluded, thus avoiding misidentification and omissions in traditional methods.

[0055] Step 4: Final reservoir logging interpretation constrained by paleo-geomorphological analysis.

[0056] Based on the final oil layer logging interpretation results under the constraints of paleo-geomorphological analysis, the single well oil layer interpretation results are derived and a database is formed. The single well oil layer interpretation results can be found in Figure 4 .

[0057] See also Figure 5 , provides an oil layer logging identification system based on paleo-geomorphology analysis constraints of the present invention, the system comprising: The determination module 501 is used to reconstruct the paleo-geomorphic characteristic map of the target area according to the collected geological sedimentary environment information of the target area, draw a paleo-geomorphic unit distribution map in the target area, and determine the type of paleo-geomorphic unit where the well is located according to the paleo-geomorphic unit distribution map in the target area; The preliminary identification module 502 is used to perform preliminary identification of the oil and water layers according to the well logging data, and divide the oil layers and water layers to obtain preliminary identification results of the oil layers; The optimization identification module 503 is used to obtain the geomorphic features of the paleomorphic unit according to the type of paleomorphic unit where the well logging is located, optimize the preliminary identification result of the oil layer, and obtain the optimized identification result of the oil layer.

[0058] It can be understood that the oil layer logging identification system based on paleomorphic analysis constraints provided by the present invention corresponds to the oil layer logging identification method based on paleomorphic analysis constraints provided in the aforementioned embodiments. The relevant technical features of the oil layer logging identification system based on paleomorphic analysis constraints can refer to the relevant technical features of the oil layer logging identification method based on paleomorphic analysis constraints, which will not be repeated here.

[0059] The oil layer logging identification method and system based on paleo-geomorphology analysis constraints provided by the embodiment of the present invention have the following beneficial effects: (1) Improving the accuracy of oil layer identification: By introducing paleo-geomorphological analysis constraints, oil layers affected by paleo-geomorphology can be identified more accurately, reducing misidentification and missed identification, especially in areas such as incised river valleys and alluvial fans with complex paleo-geomorphology.

[0060] (2) Enhance the reliability of oil layer identification: Paleogeomorphological analysis provides geological background information for oil layer identification, ensuring that the oil layer identification results are consistent with the geological conditions and improving the reliability and stability of oil layer identification.

[0061] (3) Applicable to complex geological environments: This method is particularly suitable for areas with complex oil layer distribution and strong influence of paleo-geomorphic units. It can provide explorers with more accurate oil layer identification results and avoid the uncertainty of traditional methods in complex geological environments.

[0062] (4) Optimizing oil and gas exploration decisions: By accurately identifying oil layers and their reservoir-forming conditions, it can provide a more scientific basis for oil field development, optimize exploration decisions, and improve the efficiency of oil and gas exploration and development.

[0063] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for oil layer logging identification based on paleo-geomorphological analysis constraints, characterized in that: include: Reconstructing a paleo-geomorphic feature map of the target area based on the acquired geological sedimentary environment information of the target area, drawing a paleo-geomorphic unit distribution map in the target area, and determining the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area; Based on the logging data, the oil and water layers are preliminarily identified, and the oil and water layers are divided to obtain the preliminary identification results of the oil layers; According to the type of paleo-geomorphic unit where the well logging is located, the geomorphic characteristics of the paleo-geomorphic unit are obtained, and the preliminary identification result of the oil layer is optimized to obtain the optimized identification result of the oil layer.

2. The oil layer logging identification method according to claim 1, characterized in that: The method of reconstructing a paleo-geomorphic feature map of the target area based on the acquired geological sedimentary environment information of the target area, drawing a paleo-geomorphic unit distribution map in the target area, and determining the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area includes: Obtaining geological sedimentary environment information, tectonic background and paleo-geomorphic features of the target area; Reconstructing the paleo-geomorphic features of the target area based on the geological sedimentary environment information, tectonic background, paleo-geomorphic features of the target area and the three-dimensional seismic data of the target area; Analyze the paleo-geomorphic types of different geological periods according to geological principles and draw a distribution map of paleo-geomorphic units in the target area; According to the paleo-geomorphic unit distribution map, each paleo-geomorphic unit in the target area is determined, and the type of paleo-geomorphic unit at the drilling location is obtained.

3. The oil layer logging identification method according to claim 2, characterized in that: The types of paleo-geomorphic units include at least terraces, slopes and riverside hills.

4. The oil layer logging identification method according to claim 1, characterized in that: The oil and water layers are preliminarily identified based on the well logging data, and the oil layers and water layers are divided to obtain the preliminary identification results of the oil layers, including: Preliminarily divide the oil and water layers in the target area based on the drilling and logging data; According to the changing characteristics of the logging data curve, the distribution of oil and water layers is preliminarily determined; Determine the lithology of oil and water layers based on core data and logging data; By measuring the porosity and saturation of different lithology layers, the interface between the oil layer and the water layer is determined, and the oil layer is preliminarily identified; Based on the preliminary oil layer identification results, the potential oil layer areas in the target area are marked.

5. The oil layer logging identification method according to claim 1, characterized in that: The method of obtaining the geomorphic features of the paleo-geomorphic unit according to the type of paleo-geomorphic unit where the well logging is located, optimizing the preliminary oil layer identification result, and obtaining the optimized oil layer identification result includes: According to the type of paleo-geomorphic unit where the well is located, the geomorphic features of the paleo-geomorphic unit are analyzed to determine whether the initially identified oil layer area is in an area with favorable reservoir-forming conditions; If the initially identified oil layer area is located in a paleo-geomorphological unit with high porosity and good sealing, it is determined that the initially identified oil layer area is in an area with favorable reservoir forming conditions, and the reliability of the initial oil layer identification result is high and no optimization is required; On the contrary, if the initially identified oil layer area is in an area with unfavorable reservoir forming conditions, it is necessary to optimize the initial identification result of the oil layer; The optimization of the preliminary oil layer identification result includes: Based on the geomorphic features of the paleomorphic unit where the well is located as a constraint, the preliminarily identified oil layer area is screened as the optimized oil layer identification result.

6. The oil layer logging identification method according to claim 5, characterized in that: The method of screening the initially identified oil layer area based on the geomorphic features of the paleo-geomorphic unit where the well is located as a constraint, as the result of optimized oil layer identification, includes: Based on the geomorphic characteristics of the paleo-geomorphic unit where the well is located, the spatial distribution of the oil layer area and its accumulation conditions are confirmed, and the effective reservoir range of the oil layer area is delineated.

7. An oil layer logging identification system based on paleo-geomorphological analysis constraints, characterized in that: include: A determination module is used to reconstruct a paleo-geomorphic feature map of the target area based on the acquired geological sedimentary environment information of the target area, draw a paleo-geomorphic unit distribution map in the target area, and determine the type of paleo-geomorphic unit where the well is located based on the paleo-geomorphic unit distribution map in the target area; The preliminary identification module is used to perform preliminary identification of oil and water layers according to the well logging data, and to divide the oil layer and the water layer to obtain preliminary identification results of the oil layer; The optimization identification module is used to obtain the geomorphic characteristics of the paleomorphic unit according to the type of paleomorphic unit where the well logging is located, optimize the preliminary identification result of the oil layer, and obtain the optimized identification result of the oil layer.

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