Method, device and equipment for determining paleogeomorphology of platform margin and storage medium

Abstract

This application discloses a method, apparatus, equipment, and storage medium for determining the paleogeography of a platform margin zone, comprising: acquiring the top and bottom layers of the target platform margin zone for the period to be analyzed; determining the top and bottom interfaces of the target platform margin zone for the period to be analyzed and the slope angle at a specified location in the strike direction of the target platform margin zone based on the top and bottom layers of the target platform margin zone for the period to be analyzed; analyzing the seismic properties between the top and bottom interfaces; and determining the paleogeographic background of the target platform margin zone based on the seismic properties and the slope angle. The above scheme starts with the top and bottom layers reflecting the sedimentary evolution characteristics of the platform margin zone, judges the evolution stage of the platform margin zone by the slope angle, and combines this with the actual situation of the top and bottom interfaces of the period to be analyzed to comprehensively determine the paleogeographic background of the target platform margin zone, thereby overcoming the applicability problems of traditional impression methods and residual thickness methods in platform margin zones.

Description

Technical Field

[0001] This application relates to the field of sedimentary and lithofacies paleogeography, and in particular to a method, apparatus, equipment and storage medium for determining paleogeography of platform margin zones. Background Technology

[0002] In classic marine carbonate sedimentary models, platform margins (also known as platform edges) are pivotal and crucial transitional zones connecting internal platforms with external slopes or basin margins. Due to their shallow water and high energy levels during sedimentation, they are characterized by the widespread development of high-energy facies zones. Under the context of multiple sea-level cycles, the development of high-quality, large-scale reservoirs is jointly controlled by high-energy facies zones (the foundation), high-frequency sequence boundaries (quasi-syngenetic cloudification), and high paleogeographic locations (intermittent exposure). Among these, the intensity of exposure and dissolution, controlled by the geomorphology of the sedimentary period, is the core factor in the formation of large-scale, effective reservoirs. Therefore, the reconstruction of paleogeography is crucial for the exploration and development of platform margin facies-controlled oil and gas reservoirs. Platform margins are often located in areas with the highest carbonate sedimentation rates. Because carbonate sedimentation is sensitive to microenvironments such as water depth, temperature, salinity, and hydrodynamic conditions, it exhibits characteristics of significant sedimentary environmental variations and rapid and frequent migration of sedimentary facies zones. The evolution of the platform margin's structure reflects its paleogeographic background and also alters the sedimentary paleogeography within a short period, making the analysis of its longitudinal and lateral paleogeographic differences extremely challenging. At the same time, because the platform edge zone is located in the topographic transition zone where paleogeography changes rapidly, it is difficult to find a stable marker layer that is adjacent to and has been filled in the upper and lower strata, thus greatly limiting its ability to reconstruct paleogeography. Summary of the Invention

[0003] This application provides a method, apparatus, equipment, and storage medium for determining the paleogeography of a platform margin zone. Starting from the top and bottom layers that reflect the sedimentary evolution characteristics of the platform margin zone, the evolutionary stage of the platform margin zone is determined by the slope angle. Combined with the actual situation of the top and bottom interfaces of the period to be analyzed, the paleogeographic background of the target platform margin zone is comprehensively determined, thereby overcoming the applicability problems of traditional impression method and residual thickness method in platform margin zones.

[0004] In a first aspect, embodiments of this application also provide a method for determining paleogeography of a platform margin zone, the method comprising:

[0005] Obtain the top and bottom layers of the target edge zone for the period to be analyzed;

[0006] Based on the top and bottom layers of the target edge zone to be analyzed, determine the top and bottom interfaces of the target edge zone to be analyzed and the slope angle at a specified position in the strike direction of the target edge zone;

[0007] The seismic properties between the top and bottom interfaces are analyzed, and the paleogeographic background of the target platform edge zone is determined based on the seismic properties and slope angle.

[0008] Optionally, the top and bottom interfaces of the target edge zone to be analyzed are determined based on the top and bottom layers of the target edge zone to be analyzed, including:

[0009] The top and bottom positions of the target edge zone for the analysis period are determined based on the top and bottom positions;

[0010] The stratigraphic interface between the top and bottom positions is defined as the top and bottom interface of the target platform margin for the analysis period.

[0011] Optionally, the slope angle at a specified location along the strike direction of the target platform edge is determined based on the top and bottom layers of the target platform edge zone in the period to be analyzed, including:

[0012] The top and bottom positions of the target edge zone for the analysis period are determined based on the top and bottom positions;

[0013] Obtain the maximum and minimum values ​​of the formation thickness between the top and bottom positions, as well as the horizontal distance between the top and bottom positions;

[0014] The slope angle at a specified position in the direction of the target platform edge is determined based on the maximum value, minimum value, and horizontal distance.

[0015] Optionally, the slope angle at a specified location along the direction of the target platform edge is determined based on the maximum value, minimum value, and horizontal distance, including:

[0016] Based on the maximum value, minimum value, and horizontal distance using the first formula, determine the slope angle at a specified position in the direction of the target edge zone;

[0017] The first formula includes:

[0018]

[0019] Among them, H max H min These represent the maximum and minimum values, respectively. S represents the horizontal distance, and α represents the slope angle at the specified location.

[0020] Optionally, the aforementioned seismic attributes include at least zero-crossing phase attributes, chaotic attributes, and entropy attributes.

[0021] Optionally, the paleogeographical background of the target platform edge zone can be determined based on seismic properties and slope angle, including:

[0022] The number of cycles of the target edge zone is determined based on the zero-crossing phase attribute;

[0023] The first width of the target edge zone is determined based on the chaotic properties;

[0024] The second width of the target edge band is determined based on the entropy attribute;

[0025] Compare the first width and the second width to determine the width comparison result;

[0026] The paleogeographic background of the target platform edge zone is determined based on the cycle number, the width comparison result, and the slope angle.

[0027] Optionally, the paleogeographic background of the target platform edge zone is determined based on the cycle number, width comparison results, and slope angle, including:

[0028] Determine the numerical range to which the rotation number belongs; the numerical range includes three numerical ranges from smallest to largest;

[0029] The width of the target edge zone is determined based on the width comparison results; the value range includes three ranges from smallest to largest.

[0030] Determine the angle range to which the slope angle belongs; the angle range includes three angle ranges from low to high;

[0031] When the cycle number is in the third numerical range, the width is in the first numerical range, and the slope angle is in the first angle range, the paleogeographic background of the target platform edge zone is determined to be a platform edge zone whose paleogeography belongs to the first range.

[0032] When the cycle number is in the second numerical range, the width is in the second numerical range, and the slope angle is in the third angle range, the paleogeographic background of the target platform margin is determined to be an agglomerative platform margin where the paleogeography belongs to the second range.

[0033] Given that the cycle number is in the first numerical range, the width is in the third numerical range, and the slope angle is in the second angular range, the paleogeographic background of the target platform margin is determined to be a progradational platform margin zone belonging to the second range.

[0034] Among them, the paleolandforms belonging to the second range are higher than those belonging to the first range.

[0035] Secondly, embodiments of this application also provide an apparatus for determining paleomorphology of a platform margin zone, the apparatus comprising:

[0036] The acquisition module is used to acquire the top and bottom layers of the target edge zone for the period to be analyzed;

[0037] The first determining module is used to determine the top and bottom interfaces of the target edge zone and the slope angle at a specified position in the direction of the target edge zone based on the top and bottom positions of the target edge zone to be analyzed.

[0038] The second determination module is used to analyze the seismic properties between the top and bottom interfaces and determine the paleogeographic background of the target platform edge zone based on the seismic properties and slope angle.

[0039] Thirdly, embodiments of this application also provide a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements a method for determining paleomorphology of a platform margin as provided in any embodiment of this application.

[0040] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for determining paleomorphology of a platform margin zone as provided in any embodiment of this application.

[0041] This application provides a method, apparatus, device, and storage medium for determining the paleogeography of a platform margin zone. The method includes: acquiring the top and bottom layers of the target platform margin zone for the analysis period; determining the top and bottom interfaces of the target platform margin zone for the analysis period and the slope angle at a specified location along the strike direction of the target platform margin zone based on the top and bottom layers of the target platform margin zone for the analysis period; analyzing the seismic properties between the top and bottom interfaces; and determining the paleogeographic background of the target platform margin zone based on the seismic properties and the slope angle. This approach starts with the top and bottom layers reflecting the sedimentary evolution characteristics of the platform margin zone, judges the evolutionary stage of the platform margin zone by the slope angle, and combines this with the actual situation of the top and bottom interfaces of the analysis period to comprehensively determine the paleogeographic background of the target platform margin zone, thereby overcoming the applicability issues of traditional mold impression methods and residual thickness methods in platform margin zones. Attached Figure Description

[0042] Figure 1 This is a flowchart of a method for determining paleomorphology of a platform margin zone provided in this application;

[0043] Figure 2 This is a flowchart of a method for determining the paleogeographic background of a target platform edge zone, as provided in this application.

[0044] Figure 3 This is a planar distribution map of the seismic attributes of the Wusonggeer Formation in the northern Tarim Basin, provided in an embodiment of this application.

[0045] Figure 4 This is a schematic diagram of the structure of a device for determining paleomorphology of a platform edge zone provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the structure of the computer device provided in the embodiments of this application. Detailed Implementation

[0047] The present disclosure will be further described below with reference to the embodiments shown in the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure.

[0048] Furthermore, in the embodiments of this application, terms such as "optionally" or "exemplarily" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "optionally" or "exemplarily" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "optionally" or "exemplarily" is intended to present the relevant concepts in a specific manner.

[0049] To facilitate a better understanding of the embodiments of this application, the relevant technical concepts involved in this application are further explained in detail below:

[0050] Common paleogeographic analysis methods for carbonate rocks include the imprint method and the residual thickness method: ① The imprint method requires selecting a base level overlying the target layer. Based on a detailed interpretation of the stratigraphy, the base level is flattened. The undulations of the underlying target layer can then be considered as the paleogeography of its depositional period. Alternatively, the thickness of the stratigraphy between the target layer and the base level can reflect the paleogeography of the target layer; a larger thickness indicates a lower paleogeography, and a smaller thickness indicates a higher paleogeography. However, when there is a lack of overlying marker layers, or the thickness of the overlying marker layers is unstable and fails to fill in the gaps, the imprint method is not applicable for reconstructing paleogeography. ② The residual thickness method requires selecting a base level beneath the target layer. Based on a detailed interpretation of the stratigraphy, the base level is flattened. Alternatively, the thickness between the underlying base level and the target layer can reflect its paleogeography; in this case, areas with greater thickness have higher paleogeography, and vice versa. This method also requires the underlying marker layer to have a stable thickness, essentially in a state of filling in the gaps. When performing paleogeographic reconstruction using either of these methods, the upper and lower marker layers should be selected as close as possible to the target layer to avoid the impact of differences in tectonic activity.

[0051] Because both the impression method and the residual thickness method have their limitations, a combined approach is often used in the analysis of paleogeography in carbonate karst formations. Based on the complementary relationship between the sedimentary thickness of the upper and lower strata and the residual thickness of the paleoweathering crust, the paleogeographic morphology is qualitatively analyzed: a smaller residual thickness and a smaller overlying infill thickness indicate a higher elevation, typically a karst platform; a thinner overlying stratum and a relatively thicker underlying stratum indicate some overall erosion, classifying it as a karst slope; thicker upper and lower strata suggest a lower overall elevation and less intense erosion, classifying it as a karst depression; and a thicker overlying stratum, a thicker underlying stratum, and well-developed strata generally indicate a karst remnant hill developed within a depression. The combined application of the impression method and the residual thickness method can effectively reconstruct the paleogeography of relatively stable areas within a platform. However, this method still has limitations in determining the paleogeographic background of the platform margin.

[0052] Example 1

[0053] Based on the above problems, this application provides a method for determining paleogeography of platform margin zones, such as... Figure 1 As shown, the method may include, but is not limited to, the following steps:

[0054] S101. Obtain the top and bottom layers of the target edge zone for the period to be analyzed.

[0055] In this embodiment of the application, the three-dimensional seismic horizon data of the platform margin under the sequence lattice can be used for detailed interpretation. Based on the actual application scenario, the top and bottom horizons of the platform margin period that needs to be analyzed can be selected and determined as the top and bottom horizons of the target platform margin period to be analyzed.

[0056] S102. Based on the top and bottom positions of the target edge zone to be analyzed, determine the top and bottom interfaces of the target edge zone to be analyzed and the slope angle at a specified position in the direction of the target edge zone.

[0057] For example, this step may be implemented in a manner including but not limited to the following process: determining the top and bottom positions of the target platform edge zone to be analyzed based on the top and bottom positions, and determining the stratigraphic interface between the top and bottom positions as the top and bottom interfaces of the target platform edge zone to be analyzed.

[0058] Similarly, after determining the top and bottom positions, the maximum and minimum values ​​of the stratum thickness between the top and bottom positions, as well as the horizontal distance between the top and bottom positions, can be measured; then, based on the obtained maximum and minimum values ​​and the horizontal distance, the slope angle at the specified position in the direction of the target platform edge can be determined.

[0059] It should be noted that this designated location can be set according to the actual application scenario, and multiple locations can be set.

[0060] S103. Analyze the seismic properties between the top and bottom interfaces, and determine the paleogeographic background of the target platform edge zone based on the seismic properties and slope angle.

[0061] Optionally, this step can be implemented through the following steps: obtaining the seismic attributes of the top and bottom interfaces, wherein the seismic attributes may include at least zero-crossing phase attributes, chaotic attributes, and entropy attributes; further, based on the zero-crossing phase attributes, chaotic attributes, and entropy attributes, the cycle number, width, and entropy value of the target platform margin can be determined respectively, and based on the cycle number, width, and entropy value, combined with the slope angle obtained in the above steps, the paleogeographic background of the target platform margin can be determined. Additionally, in this embodiment, when multiple designated locations are set, the paleogeographic background of the platform margin at different locations can be compared laterally.

[0062] This application provides a method for determining the paleogeography of a platform margin zone. The method includes: obtaining the top and bottom layers of the target platform margin zone for the analysis period; determining the top and bottom interfaces of the target platform margin zone for the analysis period and the slope angle at a specified location along the strike direction of the target platform margin zone based on the top and bottom layers of the target platform margin zone for the analysis period; analyzing the seismic properties between the top and bottom interfaces; and determining the paleogeographic background of the target platform margin zone based on the seismic properties and the slope angle. This approach starts with the top and bottom layers reflecting the sedimentary evolution characteristics of the platform margin zone, judges the evolutionary stage of the platform margin zone by the slope angle, and combines this with the actual situation of the top and bottom interfaces of the analysis period to comprehensively determine the paleogeographic background of the target platform margin zone, thereby overcoming the applicability issues of traditional mold imprinting and residual thickness methods in platform margin zones.

[0063] Example 2

[0064] In this embodiment of the application, the method for determining the slope angle at a specified location in the above process is described in detail as follows:

[0065] Based on the maximum value, minimum value, and horizontal distance using the first formula, determine the slope angle at a specified position in the direction of the target edge zone;

[0066] The first formula includes:

[0067]

[0068] Among them, H max H min Let S and α represent the maximum and minimum values ​​in the above formula, respectively, where S represents the horizontal distance and α represents the slope angle at the specified location.

[0069] Example 3

[0070] like Figure 2 As shown, this application provides a method for determining the paleogeographic background of a target platform edge, which may include, but is not limited to, the following process:

[0071] S201. Determine the cycle number of the target edge zone based on the zero-crossing phase attribute.

[0072] The zero-crossing phase attribute between the top and bottom interfaces reflects the number of interfaces between the two strata. It can be regarded as the number of cycles recorded by the sedimentary strata within a certain period. The higher the value, the more cycles are recorded, the larger the space that can be accommodated, and the lower the paleogeography of the sedimentary period.

[0073] S202. Determine the first width of the target edge zone based on chaotic properties.

[0074] The chaotic properties between the top and bottom interfaces reflect the boundaries of special geological bodies (such as collapse columns) based on the relative magnitudes of local tectonic tensor eigenvalues ​​and the determination of combination parameters. These chaotic properties can be used to detect areas of disordered or non-reflective areas within ordered reflections. Platform margins often exhibit internally disordered reflection characteristics, and chaotic properties can effectively reflect their distribution range. Because platform margins exhibit progradation characteristics after longitudinal accretion reaches the point where their containment space is exhausted, their width increases. Therefore, a wider platform margin can be considered to be located at a higher position in the paleogeography. In the embodiments of this application, the width of the platform margin reflected by this property can be marked as the first width.

[0075] S203. Determine the second width of the target edge band based on the entropy attribute.

[0076] The entropy attribute between the top and bottom interfaces is extracted. This attribute mainly reflects the richness of texture information between the interfaces. Since the interior of the platform margin reef body exhibits chaotic reflection, while the slopes behind and in front of the reef often show continuous high-frequency, high-amplitude reflection, the platform margin zone exhibits low entropy values, while both sides show high entropy values. Similar to the above analysis approach, the width of the platform margin zone can be determined based on the distribution range of low entropy values ​​to analyze its paleogeographic background. Therefore, the width of the platform margin zone determined by the entropy attribute can be marked as the second width.

[0077] S204. Compare the first width and the second width to determine the width comparison result.

[0078] S205. Based on the cycle number, width comparison results and slope angle, the paleogeographic background of the target platform edge zone is determined.

[0079] For example, the following scenarios can be considered in this step to determine the geomorphic background: determining the numerical range to which the cycle number belongs; wherein the numerical range includes three numerical ranges from small to large; determining the numerical range to which the width of the target platform edge belongs based on the width comparison results; wherein the numerical range includes three numerical ranges from small to large; determining the angular range to which the slope angle belongs; wherein the angular range includes three angular ranges from low to high; and determining the target platform edge when the cycle number is in the third numerical range, the width is in the first numerical range, and the slope angle is in the first angular range. The paleogeographic background of the target platform margin is determined to be an agglomerative platform margin belonging to the first range, given that the cycle number, width, and slope angle are all within the second range. Furthermore, given that the cycle number, width, and slope angle are all within the second range, the paleogeographic background of the target platform margin is determined to be a progradational platform margin belonging to the second range. The paleogeography within the second range is higher than that within the first range.

[0080] The first range includes areas with lower ancient landforms, while the second range includes areas with higher ancient landforms. In other words, the ancient landforms in the second range are higher than those in the first range. Specifically, the range of the ancient landforms can be set according to the actual situation.

[0081] For example, the third numerical interval, the second numerical interval, the first numerical interval, the first numerical range, the second numerical range, the third numerical range, as well as the first angle interval, the second angle interval, and the third angle interval can all be designed according to the actual application scenario.

[0082] For example, the first angle range can be less than 5°, the second angle range can be 5-9°, and the third angle range can be greater than 9°. Through comprehensive analysis, narrow platform margins, multiple cycles, and low slope angles indicate lower paleogeomorphic platform margins, typically underwater uplifts; wider platform margins, fewer cycles, and high slope angles indicate higher paleogeomorphic accretionary platform margins, typically containing well-developed large-scale reservoirs; and wide platform margins, fewer cycles, and higher slope angles indicate higher paleogeomorphic progradational platform margins, also typically containing well-developed large-scale reservoirs, but may exhibit lateral migration of high-energy facies zones, resulting in reservoir thicknesses relatively smaller than those of accretionary platform margins.

[0083] In the embodiments of this application, comparing the entropy attribute with the chaotic attribute can avoid the influence of fractures that are similar to the orientation of the platform edge (i.e., causing the chaotic attribute to reflect an increase in the width of the platform edge) and relatively stable deposition at the top of the platform edge under the progradation background (causing the entropy attribute to reflect a decrease in the width of the platform edge) on the determination of the width of the platform edge.

[0084] Furthermore, since multiple locations can be specified when determining the orientation of the target platform edge zone, the paleogeography of the platform edge zone at different locations can be compared laterally based on the slope angles at these multiple locations.

[0085] By employing the aforementioned comprehensive analysis of multiple attributes, the ambiguity in paleogeographic analysis caused by the diverse controlling factors of the platform margin structure can be avoided. Furthermore, the seismic attribute extraction method described above is mature, and the method for reading relevant parameters for slope angle calculation is simple, making the overall implementation scheme concise and effective. Therefore, the scheme provided in this application provides an effective means for paleogeographic analysis of platform margin zones where geomorphological changes are rapid and traditional impression methods and residual thickness methods are difficult to apply.

[0086] Example 4

[0087] This application embodiment uses the Cambrian northern platform margin zone of the Tarim Basin to conduct a lateral difference analysis of paleogeography in the Wusonggeer Formation platform margin zone.

[0088] The Cambrian platform margin belt in the Tarim Basin is currently the only large platform margin belt among the three major basins in western China that has not yet yielded breakthroughs in oil and gas exploration. It is characterized by its diverse stratigraphic systems, wide distribution, and varied exploration types. Previous studies have clarified the sedimentary evolution process of this Cambrian platform margin belt, establishing a platform margin evolution model of gentle slope (∈1x)-accretion (∈1w)-progradation (∈2a-∈3q). It is believed that the accretionary reservoir-seal combination is more optimal in the high paleogeographic region of the Wusongger Formation. Furthermore, based on source-fault-seal ternary dynamic coupling analysis, the accretionary platform margin of the Wusongger Formation can form independent large-scale oil and gas accumulation units, making it a favorable target for future strategic breakthroughs in the Cambrian platform margin belt. Therefore, paleogeography, as a major controlling factor for large-scale reservoirs, has become a key issue that must be addressed in the study of the Wusongger Formation platform margin belt.

[0089] For the Wusonggeer Formation platform margin, a slope angle analysis method based on the carbonate rock growth rate function was adopted. The thickness of the top and bottom of the platform margin was continuously measured from north to south at 64 intervals (1.6 km), and the slope angle α was calculated as shown in Table 1.

[0090] Table 1. Calculation of slope angle of Wusonggeer Formation in northern Tarim Basin by segment.

[0091]

[0092]

[0093] As shown in Table 1, the slope angle variation exhibits a clear south-to-north gradient: ① The slope angle of the northern Yuqi section is 5-8°, belonging to the early stage of gentle slope-weak rimming, dominated by underwater platform margin uplift, with low potential for large-scale reservoir development; ② The slope angle of the central Lunnan section is about 8-11°, belonging to the transition stage from weak rimming to rimmed platform margin, possibly developing facies-controlled reservoirs of a certain scale; ③ The slope angle of the southern Tahe section is about 9-13°, belonging to the rimmed platform margin stage, with great potential for developing large-scale facies-controlled reservoirs; ④ The slope angle at the southernmost end of the Tahe section shows a decreasing trend, dropping to around 10°. Based on this slope angle analysis, it can be preliminarily judged that from the northern Yuqi section to the southern Tahe section, the paleogeography of the platform margin gradually increases. The decrease in slope angle at the southernmost end of the Tahe section could be due to two possibilities: a decrease in paleogeography or a higher paleogeography leading to platform margin progradation. Further analysis of seismic attributes is needed for a definitive judgment.

[0094] like Figure 3 The image shows a planar distribution map of seismic attributes along the Wusonggeer Formation in the northern Tarim Basin. From left to right, the map shows the planar distribution of zero-crossing phase attributes, chaotic attributes, and entropy attributes. Analysis based on the zero-crossing phase attributes reveals that the attribute values ​​in the northern segment of the platform margin are higher than those in the southern segment. This indicates that the northern segment has a larger accommodative space, records more sedimentary cycles, and exhibits lower paleogeographic features during its depositional period, consistent with the paleogeographic characteristics of slope response.

[0095] Analysis based on chaotic properties shows that the width of the Yuqi section platform margin is significantly narrower, indicating that it is in the early stage of agglomeration and uplift. The Lunnan section is strongly influenced by fault zones and tectonic activity, resulting in a wider anomalous area, but this may not reflect sedimentary information of the platform margin. The width of the Tahe section platform margin gradually increases from north to south. Based on slope angle calculations, it is believed that the paleogeography of the southernmost platform margin of the Tahe section is the highest, indicating the phenomenon of platform margin progradation.

[0096] Analysis based on entropy attributes reveals that the Yuqi segment's platform margin is significantly narrower, indicating an early stage of accretionary uplift. The Lunnan segment, with its relatively clear platform margin range and wider margin compared to the Yuqi segment, exhibits a clearer overall width. The Tahe segment's platform margin is wider than the Lunnan segment, reflecting a higher paleogeography. However, the southernmost low-entropy range is significantly smaller. Combined with a slight decrease in slope angle, low zero-crossing phase attributes, and the characteristic of a continuously increasing platform margin width reflected by chaotic attributes, it is concluded that the southernmost platform margin of the Tahe segment has the highest paleogeography, indicating a platform margin progradation phenomenon.

[0097] A comprehensive analysis of the slope angle and seismic attributes reveals that the overall paleogeographic background of the Wusonggeer Formation platform margin exhibits a south-high, north-low characteristic: In the Yuqi segment, the platform margin is narrow, the number of recorded cycles is high, and the slope angle is low, thus satisfying the first condition mentioned above, indicating a low-lying platform margin, presumably an underwater uplift; In the Lunnan segment, the platform margin is relatively wide, the number of recorded cycles is low, and the slope angle is large, thus satisfying the second condition mentioned above, indicating a high-lying agglomerative platform margin; In the main body of the Tahe segment, the platform margin is wide, the number of recorded cycles is low, and the slope angle is large, indicating an agglomerative platform margin with a paleogeographic background; In the southernmost part of the Tahe segment, the platform margin continues to widen, the number of recorded cycles continues to decrease, and the slope angle slightly decreases, thus satisfying the third condition mentioned above, indicating a progradational platform margin with a paleogeographic background. A comprehensive evaluation suggests that the middle section of the Tahe Formation platform margin has the best paleogeographic background for developing large-scale, high-quality reservoirs. The southernmost section of the Tahe Formation platform margin may have entered the evolution stage of a progradational platform margin, which usually also has well-developed large-scale reservoirs, but there may be lateral migration of high-energy facies zones, and the reservoir thickness is relatively smaller than that of the accretionary platform margin.

[0098] Example 5

[0099] Figure 4 A schematic diagram of a device for determining paleogeography of a platform margin zone is provided in an embodiment of this application, as shown below. Figure 4 As shown, the device may include: an acquisition module 401, a first determination module 402, and a second determination module 403;

[0100] The acquisition module is used to acquire the top and bottom layers of the target edge zone for the period to be analyzed;

[0101] The first determining module is used to determine the top and bottom interfaces of the target edge zone and the slope angle at a specified position in the direction of the target edge zone based on the top and bottom positions of the target edge zone to be analyzed.

[0102] The second determination module is used to analyze the seismic properties between the top and bottom interfaces and determine the paleogeographic background of the target platform edge zone based on the seismic properties and slope angle.

[0103] Specifically, the first determining module is used to determine the top and bottom positions of the target platform margin zone to be analyzed based on the top and bottom positions; and to determine the stratigraphic interface between the top and bottom positions as the top and bottom interface of the target platform margin zone to be analyzed.

[0104] In one example, the first determining module is further configured to determine the top and bottom positions of the target platform edge zone for the analysis period based on the top and bottom positions; obtain the maximum and minimum values ​​of the formation thickness between the top and bottom positions, as well as the horizontal distance between the top and bottom positions; and determine the slope angle at a specified position in the strike direction of the target platform edge zone based on the maximum, minimum, and horizontal distance.

[0105] Specifically, the first determining module can be used to determine the slope angle at a specified position in the direction of the target edge zone based on the maximum value, minimum value, and horizontal distance according to the first formula;

[0106] The first formula includes:

[0107]

[0108] Among them, H max H min These represent the maximum and minimum values ​​in the above formula, respectively; S represents the horizontal distance; and α represents the slope angle at the specified location.

[0109] In one example, the aforementioned seismic properties include at least zero-crossing phase properties, chaotic properties, and entropy properties.

[0110] In one example, the second determining module is used to determine the cycle number of the target edge zone based on the zero-crossing phase attribute; determine the first width of the target edge zone based on the chaotic attribute; determine the second width of the target edge zone based on the entropy attribute; compare the first width and the second width to determine the width comparison result; and determine the paleogeographic background of the target edge zone based on the cycle number, the width comparison result, and the slope angle.

[0111] Specifically, the aforementioned second determining module can be used to determine the numerical range to which the cycle number belongs; wherein the numerical range includes three numerical ranges from small to large; determine the numerical range to which the width of the target platform edge zone belongs based on the width comparison results; wherein the numerical range includes three numerical ranges from small to large; determine the angular range to which the slope angle belongs; wherein the angular range includes three angular ranges from low to high; when the cycle number is in the third numerical range, the width is in the first numerical range, and the slope angle is in the first angular range, the paleogeographic background of the target platform edge zone is determined to be a platform edge zone with paleogeography belonging to the first range; when the cycle number is in the second numerical range, the width is in the second numerical range, and the slope angle is in the third angular range, the paleogeographic background of the target platform edge zone is determined to be an agglomerative platform edge zone with paleogeography belonging to the second range; when the cycle number is in the first numerical range, the width is in the third numerical range, and the slope angle is in the second angular range, the paleogeographic background of the target platform edge zone is determined to be a progradational platform edge zone with paleogeography belonging to the second range.

[0112] Among them, the paleolandforms belonging to the second range are higher than those belonging to the first range.

[0113] The aforementioned device for determining the paleogeography of the platform margin zone can perform... Figures 1-3 The provided method for determining paleogeography of platform margins includes the corresponding devices and beneficial effects.

[0114] Example 6

[0115] Figure 5 This application provides a schematic diagram of the structure of a computer device, as shown in the embodiment of the present application. Figure 5 As shown, the computer device includes a controller 501, a memory 502, an input device 503, and an output device 504; the number of controllers 501 in the computer device can be one or more. Figure 5 Taking a controller 501 as an example; the controller 501, memory 502, input device 503, and output device 504 in a computer device can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0116] Memory 502, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as... Figure 1 The program instructions / modules corresponding to the method for determining the paleomorphology of the platform margin zone in the embodiments (e.g., the acquisition module 401, the first determination module 402, the second determination module 403, etc. in the device for determining the paleomorphology of the platform margin zone). The controller 501 executes various functions of the computer device and data processing by running the software programs, instructions, and modules stored in the memory 502, that is, it implements the above-described method for determining the paleomorphology of the platform margin zone.

[0117] Memory 502 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on computer usage. Furthermore, memory 502 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, memory 502 may further include memory remotely configured relative to controller 501, which can be connected to a terminal / server via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0118] Input device 503 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the computer device. Output device 504 may include a display device such as a screen.

[0119] Example 7

[0120] This application also provides a storage medium containing computer-executable instructions, which, when executed by a computer controller, are used to perform a method for determining paleogeography of a platform margin zone. The method includes... Figure 1 The steps are shown.

[0121] Based on the above description of the implementation methods, those skilled in the art can clearly understand that this application can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0122] It is worth noting that the modules included in the above-mentioned device for determining the paleogeography of the platform margin are only divided according to functional logic, but are not limited to the above-mentioned division method. As long as the corresponding function can be achieved, it is acceptable and is not intended to limit the scope of protection of this application.

[0123] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for determining paleogeography of a platform margin zone, characterized in that, The method includes: Obtain the top and bottom layers of the target edge zone for the period to be analyzed; Based on the top and bottom positions of the target edge zone to be analyzed, determine the top and bottom interfaces of the target edge zone to be analyzed and the slope angle at a specified position in the direction of the target edge zone; Analyze the seismic properties between the top and bottom interfaces, and determine the paleogeographic background of the target platform edge zone based on the seismic properties and the slope angle; The earthquake attributes include at least zero-crossing phase attributes, chaotic attributes, and entropy attributes; The process of determining the paleogeographic background of the target platform edge zone based on the seismic attributes and the slope angle includes: The number of cycles of the target edge zone is determined based on the zero-crossing phase attribute; The first width of the target edge zone is determined based on the chaotic properties; The second width of the target edge band is determined based on the entropy attribute; Compare the first width and the second width to determine the width comparison result; The paleogeographic background of the target platform edge zone is determined based on the number of cycles, the width comparison results, and the slope angle. The paleogeographic background of the target platform edge zone is determined based on the cycle number, the width comparison result, and the slope angle, including: Determine the numerical range to which the cycle number belongs; wherein the numerical range includes three numerical ranges from smallest to largest; The width of the target edge band is determined based on the width comparison results; wherein, the value range includes three value ranges from small to large; Determine the angle range to which the slope angle belongs; wherein, the angle range includes three angle ranges from low to high; When the number of cycles is in the third numerical range, the width is in the first numerical range, and the slope angle is in the first angle range, the paleogeographic background of the target platform edge zone is determined to be a platform edge zone whose paleogeography belongs to the first range. When the number of cycles is in the second numerical range, the width is in the second numerical range, and the slope angle is in the third angle range, the paleogeographic background of the target platform margin is determined to be an agglomerative platform margin where the paleogeography belongs to the second range. When the number of cycles is in the first numerical range, the width is in the third numerical range, and the slope angle is in the second angle range, the paleogeographic background of the target platform margin is determined to be a progradational platform margin zone belonging to the second range. Among them, the paleolandforms belonging to the second range are higher than those belonging to the first range.

2. The method according to claim 1, characterized in that, The step of determining the top and bottom interfaces of the target edge zone for the analysis period based on the top and bottom positions of the target edge zone includes: Based on the top and bottom positions, determine the top and bottom positions of the target edge zone for the analysis period; The stratigraphic interface between the top and bottom positions is defined as the top and bottom interface of the target platform margin for the analysis period.

3. The method according to claim 1, characterized in that, The step of determining the slope angle at a specified position in the strike direction of the target platform edge zone based on the top and bottom layers of the target platform edge zone for the period to be analyzed includes: Based on the top and bottom positions, determine the top and bottom positions of the target edge zone for the analysis period; Obtain the maximum and minimum values ​​of the formation thickness between the top and bottom positions, as well as the horizontal distance between the top and bottom positions; The slope angle at a specified position in the direction of the target edge zone is determined based on the maximum value, the minimum value, and the horizontal distance.

4. The method according to claim 3, characterized in that, Determining the slope angle at a specified position in the direction of the target edge zone based on the maximum value, the minimum value, and the horizontal distance includes: Based on the maximum value, the minimum value, and the horizontal distance using a first formula, determine the slope angle at a specified position along the direction of the target edge zone; The first formula includes: α= in, , Let S and α represent the maximum value and the minimum value, respectively, S represent the horizontal distance, and α represent the slope angle at the specified position.

5. An apparatus for determining paleomorphology of a platform margin zone in implementing the method for determining paleomorphology of a platform margin zone according to any one of claims 1-4, characterized in that, The device includes: The acquisition module is used to acquire the top and bottom layers of the target edge zone for the period to be analyzed; The first determining module is used to determine the top and bottom interfaces of the target edge zone to be analyzed and the slope angle at a specified position in the direction of the target edge zone based on the top and bottom positions of the target edge zone to be analyzed. The second determining module is used to analyze the seismic properties between the top and bottom interfaces, and determine the paleogeographic background of the target platform edge zone based on the seismic properties and the slope angle.

6. A computer device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method for determining paleogeography of the platform margin zone as described in any one of claims 1-4.

7. A device-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method for determining paleomorphology of the platform margin zone as described in any one of claims 1-4.

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