Method, device and equipment for determining ancient landform of abutment margin zone and storage medium

Abstract

The invention discloses a method, device and equipment for determining the ancient landform of a border zone, and a storage medium. The method comprises the following steps: obtaining a top and bottom layer position of a to-be-analyzed period of a target border zone; based on the top and bottom layer positions of the to-be-analyzed period of the target station marginal zone, respectively determining a top and bottom interface of the to-be-analyzed period of the target station marginal zone and a slope angle of a specified position in the trend direction of the target station marginal zone; and analyzing seismic attributes between the top interface and the bottom interface, and determining an ancient landform background where the target abutment marginal zone is located based on the seismic attributes and the slope angle. According to the scheme, starting from the top and bottom layer reflecting the sedimentary evolution characteristics of the abutment margin, the evolution stage of the abutment margin is judged through the size of the slope angle, and the ancient landform background where the target abutment margin is located is comprehensively judged and determined in combination with the actual situation of the top and bottom interface of the period to be analyzed; therefore, the applicability problem of the traditional impression method and the residual thickness method on the abutment margin band is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sedimentation and lithofacies paleogeography, and particularly relates to a method and device for determining paleogeomorphology of a platform margin zone, equipment and a storage medium. BACKGROUND

[0002] In a classic marine carbonate sedimentation model, the platform margin zone (also known as the platform edge) is a turning point and pivotal zone connecting the inner platform and the outer slope or the edge of the basin. Due to its characteristics of shallow water and high energy during the deposition period, the high-energy facies zone is widely developed. Under the background of multiple cycles of sea level fluctuation, the development of high-quality large-scale reservoirs is jointly controlled by the high-energy facies zone (basis), high-frequency sequence interface (penecontemporaneous dolomitization), and high-position paleogeomorphology (intermittent exposure). Among them, the exposure and dissolution intensity is controlled by the paleogeomorphology during the deposition period, which is the core of forming large-scale effective reservoirs. Therefore, the restoration of the paleogeomorphology is crucial for the exploration and development of platform margin facies-controlled oil and gas reservoirs. The platform margin zone is often located in the region with the highest carbonate deposition rate. Due to the sensitivity of carbonate deposition to water depth, temperature, salinity, and hydrodynamic conditions, the platform margin zone has the characteristics of large changes in sedimentary environment, rapid and frequent migration of sedimentary facies zones. The evolution process of the structure of the platform margin zone reflects the paleogeomorphology background and changes the paleogeomorphology in a short period of time, making it difficult to analyze the evolution of the vertical and horizontal paleogeomorphology. At the same time, since the platform margin zone is located in the topographic turning zone with rapid changes in paleogeomorphology, it is difficult to find stable marker layers that are adjacent and complete in the upper and lower strata, so there are great limitations in the restoration of the paleogeomorphology. SUMMARY

[0003] Embodiments of the present application provide a method, device, equipment and storage medium for determining the paleogeomorphology of a platform margin zone. Starting from the top and bottom positions of the platform margin zone reflecting the evolution characteristics of the platform margin zone, the evolution stage of the platform margin zone is determined by the slope angle, and the paleogeomorphology background of the target platform margin zone is determined by combining the actual situation of the top and bottom interfaces of the period to be analyzed, thereby overcoming the applicability problem of the traditional impression method and the residual thickness method in the platform margin zone.

[0004] In a first aspect, the embodiments of the present application also provide a method for determining the paleogeomorphology of a platform margin zone, which comprises:

[0005] obtaining the top and bottom positions of the period to be analyzed of the target platform margin zone;

[0006] determining the top and bottom interfaces of the period to be analyzed of the target platform margin zone and the slope angle of the specified position in the strike direction of the target platform margin zone based on the top and bottom positions of the period to be analyzed of the target platform margin zone;

[0007] analyzing the seismic attributes between the top and bottom interfaces, and determining the paleogeomorphology background of the target platform margin zone based on the seismic attributes and the slope angle.

[0008] Optionally, determining the top and bottom interfaces of the target platform edge zone in the period to be analyzed based on the top and bottom layer positions of the target platform edge zone in the period to be analyzed comprises:

[0009] Determining the top and bottom positions of the target platform edge zone in the period to be analyzed based on the top and bottom layer positions;

[0010] Determining the stratigraphic interface between the top and bottom positions as the top and bottom interfaces of the target platform edge zone in the period to be analyzed.

[0011] Optionally, determining the slope angle of the specified position in the strike direction of the target platform edge zone in the period to be analyzed based on the top and bottom layer positions of the target platform edge zone in the period to be analyzed comprises:

[0012] Determining the top and bottom positions of the target platform edge zone in the period to be analyzed based on the top and bottom layer positions;

[0013] Obtaining the maximum value, the minimum value of the stratigraphic thickness between the top and bottom positions, and the horizontal distance between the top and bottom positions;

[0014] Determining the slope angle of the specified position in the strike direction of the target platform edge zone in the period to be analyzed according to the maximum value, the minimum value, and the horizontal distance.

[0015] Optionally, determining the slope angle of the specified position in the strike direction of the target platform edge zone in the period to be analyzed according to the maximum value, the minimum value, and the horizontal distance comprises:

[0016] Determining the slope angle of the specified position in the strike direction of the target platform edge zone in the period to be analyzed based on a first formula according to the maximum value, the minimum value, and the horizontal distance;

[0017] The first formula comprises:

[0018]

[0019] Wherein, H max , H min respectively represent the maximum value and the minimum value, S represents the horizontal distance, and a represents the slope angle at the specified position.

[0020] Optionally, the above seismic attributes at least include a zero-crossing point phase attribute, a chaos attribute, and an entropy attribute.

[0021] Optionally, determining the paleogeomorphic background in which the target platform edge zone is located based on the seismic attributes and the slope angle comprises:

[0022] Determining the number of cycles of the target platform edge zone based on the zero-crossing point phase attribute;

[0023] Determining a first width of the target platform edge zone based on the chaos attribute;

[0024] Determining a second width of the target platform edge zone based on the entropy attribute;

[0025] determining a width contrast result by comparing the first width and the second width;

[0026] determining a paleogeomorphologic background of the target platform margin zone based on the number of cycles, the width contrast result and the slope angle.

[0027] Optionally, determining the paleogeomorphologic background of the target platform margin zone based on the number of cycles, the width contrast result and the slope angle comprises:

[0028] determining a numerical interval to which the number of cycles belongs; wherein the numerical interval comprises three numerical intervals from small to large;

[0029] determining a numerical range to which the width of the target platform margin zone belongs based on the width contrast result; wherein the numerical range comprises three numerical ranges from small to large;

[0030] determining an angle interval to which the slope angle belongs; wherein the angle interval comprises three angle intervals from low to high;

[0031] in a case that the number of cycles is located in the third numerical interval, the width is located in the first numerical range and the slope angle is located in the first angle interval, determining that the paleogeomorphologic background of the target platform margin zone is that the paleogeomorphology belongs to a first range of platform margin zone;

[0032] in a case that the number of cycles is located in the second numerical interval, the width is located in the second numerical range and the slope angle is located in the third angle interval, determining that the paleogeomorphologic background of the target platform margin zone is that the paleogeomorphology belongs to a second range of aggradational platform margin zone;

[0033] in a case that the number of cycles is located in the first numerical interval, the width is located in the third numerical range and the slope angle is located in the second angle interval, determining that the paleogeomorphologic background of the target platform margin zone is that the paleogeomorphology belongs to a second range of progradational platform margin zone;

[0034] wherein the paleogeomorphology belonging to the second range is higher than the paleogeomorphology belonging to the first range.

[0035] In a second aspect, the embodiments of the present application further provide a device for determining a paleogeomorphology of a platform margin zone, which comprises:

[0036] a first determining module configured to determine a top-bottom interface of the target platform margin zone and a slope angle of a specified position in a strike direction of the target platform margin zone based on the top and bottom positions of the target platform margin zone to be analyzed;

[0037] a first determining module configured to determine a top-bottom interface of the target platform margin zone and a slope angle of a specified position in a strike direction of the target platform margin zone based on the top and bottom positions of the target platform margin zone to be analyzed;

[0038] a second determining module configured to analyze a seismic attribute between the top and bottom interfaces and determine a paleogeomorphologic background of the target platform margin zone based on the seismic attribute and the slope angle.

[0039] In a third aspect, the embodiments of the present application further provide a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, a method for determining a paleogeomorphology of a platform margin zone is implemented.

[0040] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, having a computer program stored thereon, and when the computer program is executed by a processor, a method for determining a paleogeomorphology of a platform margin zone is implemented.

[0041] The embodiments of the present application provide a method, device, equipment and storage medium for determining a paleogeomorphology of a platform margin zone, comprising: obtaining top and bottom layer positions of a target platform margin zone in an analysis period; determining top and bottom interfaces of the target platform margin zone in the analysis period and a slope angle of a specified position in a strike direction of the target platform margin zone based on the top and bottom layer positions of the target platform margin zone in the analysis period; analyzing a seismic attribute between the top and bottom interfaces, and determining a paleogeomorphology background of the target platform margin zone based on the seismic attribute and the slope angle. The above solution starts from the top and bottom layer positions reflecting the sedimentary evolution characteristics of the platform margin zone, determines the evolution stage of the platform margin zone through the slope angle, and comprehensively determines the paleogeomorphology background of the target platform margin zone in combination with the actual situation of the top and bottom interfaces in the analysis period, thereby overcoming the applicability problem of the traditional impression method and residual thickness method in the platform margin zone. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a method flowchart for determining a paleogeomorphology of a platform margin zone provided by the present application;

[0043] Figure 2 is a method flowchart for determining a paleogeomorphology background of a target platform margin zone provided by the present application;

[0044] Figure 3 is a planar distribution map of seismic attributes of a platform margin zone of the Wusonggai Formation in the Tabei region provided by the embodiments of the present application;

[0045] Figure 4 is a structural schematic diagram of a device for determining a paleogeomorphology of a platform margin zone provided by the embodiments of the present application;

[0046] Figure 5 is a structural schematic diagram of a computer device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0047] The present disclosure will be further described below in conjunction with the embodiments shown in the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only parts related to the present application are shown in the drawings, but not all structures.

[0048] In addition, in the embodiments of the present application, the words "optionally" or "exemplarily" are used to mean by way of example, illustration or description. Any embodiment or design scheme described as "optionally" or "exemplarily" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the words "optionally" or "exemplarily" are used to present the relevant concept in a specific manner.

[0049] In order to better understand the embodiments of the present application, the related technical concepts involved in the present application are further explained in detail as follows:

[0050] The commonly used paleogeomorphology analysis methods for carbonate rocks include the impression method and the residual thickness method: ① The impression method requires selecting a reference surface overlying the target layer, and on the basis of fine layer interpretation, the reference surface is flattened, and then the relief of the underlying target layer is regarded as the paleogeomorphology in the deposition period of the target layer, or the thickness between the target layer and the reference surface is used to reflect the paleogeomorphology of the target layer, that is, the thicker the thickness, the lower the paleogeomorphology, and the thinner the thickness, the higher the paleogeomorphology. However, when the overlying marker layer is lacking or the thickness of the overlying marker layer is unstable and does not play a role in filling and smoothing, the method of using the impression method to restore the paleogeomorphology is not applicable. ② The residual thickness method requires selecting a reference surface underlying the target layer, and on the basis of fine layer interpretation, the reference surface is flattened, or the thickness between the underlying reference surface and the target layer surface is used to reflect the paleogeomorphology, that is, the thicker the thickness, the higher the paleogeomorphology, and vice versa. This method also requires that the thickness of the underlying marker layer be stable and basically in a state of filling and smoothing. The selection of the overlying and underlying marker layers in the two methods for paleogeomorphology restoration needs to be as close to the target layer as possible to avoid the influence of structural activity differences.

[0051] Due to the limitations of the impression method and the residual thickness method, the comprehensive method of the two is often used for analyzing the karst paleogeomorphology of carbonate rocks, and the complementary relationship between the sedimentary thickness and the residual thickness of the overlying and underlying strata of the paleo-weathering crust is used to qualitatively analyze the paleogeomorphology: when the residual thickness is small and the overlying filling thickness is also small, it indicates that the region has high topography, and is usually a karst platform; when the overlying strata are thin and the underlying strata are relatively thick, it indicates that the region as a whole has a certain erosion and belongs to a karst slope; when the overlying and underlying strata are both thick, it indicates that the region as a whole has low topography and the erosion is not strong, and belongs to a karst depression; when the overlying strata are thick and the underlying strata are thick, and the strata are well developed, it generally belongs to a karst monad developed in the depression. Through the comprehensive application of the impression method and the residual thickness method, the paleogeomorphology of the relatively stable structure inside the platform can be effectively restored. However, this method still has limitations in determining the paleogeomorphology background of the platform margin zone.

[0052] Embodiment one

[0053] Based on the above problems, the embodiments of the present application provide a method for determining the paleogeomorphology of a platform margin zone, as shown inFigure 1 As shown, the method can include but is not limited to the following steps:

[0054] S101, acquiring top and bottom layer positions of a target platform margin zone to be analyzed.

[0055] In the embodiments of the present application, the three-dimensional seismic layer position fine interpretation data of the platform margin zone under the sequence framework can be utilized, and then based on the actual application scenario, the top and bottom layer positions of the platform margin period to be analyzed for paleogeomorphology analysis can be selected and determined as the top and bottom layer positions of the target platform margin zone to be analyzed.

[0056] S102, determining a top-bottom interface of the target platform margin zone to be analyzed and a slope angle of a specified position in a strike direction of the target platform margin zone to be analyzed based on the top and bottom layer positions of the target platform margin zone to be analyzed.

[0057] Exemplarily, the implementation manner of the present step can include but is not limited to the following process: determining a top position and a bottom position of the target platform margin zone to be analyzed based on the top and bottom layer positions, and determining a stratigraphic interface between the top position and the bottom position as the top-bottom interface of the target platform margin zone to be analyzed.

[0058] Similarly, after the top position and the bottom position are determined, the maximum value, the minimum value of the stratigraphic thickness between the top position and the bottom position, and the horizontal distance between the top position and the bottom position can be measured; and then the slope angle of the specified position in the strike direction of the target platform margin zone is determined according to the above obtained maximum value, minimum value and horizontal distance.

[0059] It should be noted that the specified position can be set according to the actual application scenario, and multiple positions can be set.

[0060] S103, analyzing the seismic attribute between the top-bottom interface, and determining the paleogeomorphology background where the target platform margin zone is located based on the seismic attribute and the slope angle.

[0061] Optionally, the present step can be implemented by the following steps, i.e., acquiring the seismic attribute of the top-bottom interface, wherein the seismic attribute can at least include the zero-crossing phase attribute, the chaos attribute and the entropy attribute; further, the cycle number, the width and the entropy value of the target platform margin zone can be determined based on the zero-crossing phase attribute, the chaos attribute and the entropy attribute respectively, and the paleogeomorphology background where the target platform margin zone is located is determined according to the cycle number, the width and the entropy value, and the slope angle obtained in the above step. In addition, in the embodiments of the present application, in the case of setting multiple specified positions, the platform margin zone paleogeomorphology backgrounds of different positions can be compared horizontally.

[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 attribute between the top and bottom interfaces is based on the relative size of the local constructed tensor eigenvalue and the determination of the combination parameter to reflect the boundary of the special geological body (such as a collapse column). The chaotic attribute can be used to detect the region with chaotic or no reflection between ordered reflections. The platform margin belt often has internal chaotic reflection characteristics, and the chaotic attribute can well reflect its distribution range. Since the platform margin belt is longitudinally accreted to the point where the available space is exhausted, the platform margin belt will appear to be progradational, resulting in an increase in the width of the platform margin belt. Therefore, a wider platform margin belt can be considered to be in a higher paleogeomorphology. In the embodiments of the present application, the width of the platform margin belt reflected by the attribute can be marked as a first width.

[0075] S203, determining a second width of the target platform margin belt based on the entropy attribute.

[0076] An entropy attribute between the top and bottom interfaces is extracted, which mainly reflects the richness of the texture information between the interfaces. Since the platform margin reef bank body is internally chaotic reflection, and the slope behind and in front of the reef is often high-frequency strong-amplitude continuous reflection, the platform margin belt shows a low entropy value, and both sides show a high entropy value. Similar to the above analysis idea, the width of the platform margin belt can be determined according to the low entropy value distribution range, and the paleogeomorphology background can be analyzed, so the width of the platform margin belt determined by the entropy attribute can be marked as a second width.

[0077] S204, comparing the first width and the second width to determine a width comparison result.

[0078] S205, determining the paleogeomorphology background of the target platform margin belt based on the cycle number, the width comparison result, and the slope angle.

[0079] For example, in this step, the following situations can be considered to determine the paleogeomorphology background: determining the numerical interval to which the cycle number belongs; the numerical interval includes three numerical intervals from small to large; determining the numerical range to which the width of the target platform margin belt belongs according to the width comparison result; the numerical range includes three numerical ranges from small to large; determining the angle interval to which the slope angle belongs; the angle interval includes three angle intervals from low to high; in the case that the cycle number is located in the third numerical interval, the width is located in the first numerical range, and the slope angle is located in the first angle interval, it is determined that the paleogeomorphology background of the target platform margin belt is that the paleogeomorphology belongs to the first range of the platform margin belt; in the case that the cycle number is located in the second numerical interval, the width is located in the second numerical range, and the slope angle is located in the third angle interval, it is determined that the paleogeomorphology background of the target platform margin belt is that the paleogeomorphology belongs to the second range of the accretion platform margin belt; in the case that the cycle number is located in the first numerical interval, the width is located in the third numerical range, and the slope angle is located in the second angle interval, it is determined that the paleogeomorphology background of the target platform margin belt is that the paleogeomorphology belongs to the second range of the progradational platform margin belt; wherein the paleogeomorphology belonging to the second range is higher than the paleogeomorphology belonging to the first range.

[0080] The first range includes a relatively low palaeogeomorphology, and the second range includes a relatively high palaeogeomorphology, that is, the palaeogeomorphology belonging to the second range is higher than the palaeogeomorphology belonging to the first range. Specifically, the high and low ranges of the palaeogeomorphology can be set according to actual conditions.

[0081] Exemplarily, the third numerical interval, the second numerical interval, the first numerical interval, the first numerical range, the second numerical range, the third numerical range, and the first angle interval, the second angle interval, and the third angle interval can be designed according to actual application scenarios.

[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 more than 9°. Through comprehensive analysis, the narrow platform margin, multiple cycles, and low slope angle are a relatively low palaeogeomorphology platform margin zone, which is usually an underwater build-up; the relatively wide platform margin, fewer cycles, and high slope angle are a relatively high palaeogeomorphology aggradational platform margin zone, which is usually a well-developed large-scale reservoir; the wide platform margin, fewer cycles, and higher slope angle are a relatively high palaeogeomorphology progradational platform margin zone, which is also usually a well-developed large-scale reservoir, but there can be a lateral migration of high-energy facies belts, and the reservoir thickness is relatively smaller than that of the aggradational platform margin.

[0083] In the embodiment of the present application, the comparison of the entropy attribute and the chaos attribute can avoid the influence of the fracture similar to the platform margin zone trend (that is, the chaos attribute reflects the increase of the platform margin zone width) and the relatively stable platform margin top sediment under the progradation background (which causes the entropy attribute to reflect the decrease of the platform margin zone width) on the determination of the platform margin zone width.

[0084] Further, since multiple positions can be specified when determining the specified position of the target platform margin zone trend direction, the platform margin zone palaeogeomorphology of different positions can be compared laterally based on the slope angles of the multiple positions.

[0085] Through the above-mentioned comprehensive analysis of multiple attributes, the palaeogeomorphology analysis multi-solution caused by various platform margin structure control factors can be avoided, and the above-mentioned seismic attribute extraction method is mature, and the slope angle calculation related parameter reading method is simple, so that the overall method of the entire implementation scheme is simple and effective. Thus, the scheme provided in the embodiment of the present application provides an effective means for the palaeogeomorphology analysis of the platform margin zone with rapid geomorphological changes and difficulties in traditional impression method and residual thickness method analysis.

[0086] Embodiment four

[0087] The embodiment of the present application analyzes the lateral difference of the platform margin zone palaeogeomorphology of the Wusonggeli Formation in the Cambrian Tabei platform margin zone of the Tarim Basin.

[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] Based on the chaos attribute analysis, it can be seen that the platform margin zone of Yuqi section is obviously narrow, which is in the early stage of aggradation and building-up; the abnormal zone of Lunnan section is relatively wide, which is affected by the fracture zone and strong tectonic activity, but it may not reflect the sedimentary information of platform margin zone; the platform margin zone width of Tahe section gradually increases from north to south, combined with the slope angle calculation, it is considered that the platform margin zone of the southernmost part of Tahe section has the highest paleogeomorphology, and the phenomenon of platform margin progradation occurs.

[0096] Based on the entropy attribute analysis, it can be seen that the platform margin zone of Yuqi section is obviously narrow, which is in the early stage of aggradation and building-up; the platform margin zone of Lunnan section is relatively clear compared with the chaos attribute, and the platform margin zone width is larger than that of Yuqi section; the platform margin zone width of Tahe section is larger than that of Lunnan section, which reflects that the paleogeomorphology is higher than that of Lunnan section, but the low entropy range of the southernmost part of Tahe section is significantly reduced, combined with the small decrease of the slope angle, and the over-zero point phase attribute is low and the platform margin zone width reflected by the chaos attribute continuously increases, it is considered that the platform margin zone of the southernmost part of Tahe section has the highest paleogeomorphology, and the phenomenon of platform margin progradation occurs.

[0097] Through the comprehensive analysis of the above slope angle and seismic attribute, it is found that the overall paleogeomorphology background of Wusonggeler Formation platform margin zone has the characteristics of high in the south and low in the north: in Yuqi section, the platform margin zone is narrow, the number of recorded cycles is large, and the slope angle is low, that is, it meets the first condition, which is the platform margin zone with low paleogeomorphology, and it is speculated to be a subaqueous building-up; in Lunnan section, the platform margin zone is wide, the number of recorded cycles is small, and the slope angle is large, that is, it meets the second condition, which is the aggradational platform margin zone with high paleogeomorphology; in the main part of Tahe section, the platform margin zone is wide, the number of recorded cycles is small, and the slope angle is large, which is the aggradational platform margin zone with high paleogeomorphology; in the southernmost part of Tahe section, the platform margin zone continuously widens, the number of recorded cycles continuously decreases, and the slope angle slightly slows down, that is, it meets the third condition, which is the progradational platform margin zone with high paleogeomorphology background. It is considered that the middle section of Tahe section platform margin zone of Wusonggeler Formation has the best paleogeomorphology background for developing high-quality reservoirs, and the southernmost section of Tahe section platform margin zone may have entered the evolution stage of progradational platform margin zone, and usually develops good scale reservoirs, but there may be horizontal migration of high-energy facies belt, and the reservoir thickness is relatively smaller than that of the aggradational platform margin.

[0098] Embodiment Five

[0099] Figure 4 The structure diagram of a device for determining the paleogeomorphology of a platform margin zone provided by the embodiments of the present application is shown in FIG. 1, which can include an acquisition module 401, a first determination module 402, and a second determination module 403. Figure 4

[0100] The acquisition module is configured to acquire the top and bottom positions of the target platform margin zone to be analyzed.

[0101] The first determination module is configured to determine the top and bottom boundaries of the target platform margin zone to be analyzed and the slope angle of a specified position in the strike direction of the target platform margin zone based on the top and bottom positions of the target platform margin zone to be analyzed. ​

[0102] The second determining module is configured to analyze a seismic attribute between the top-bottom interface, and determine the paleogeomorphology background of the target platform margin zone based on the seismic attribute and the slope angle.

[0103] The first determining module is specifically configured to determine the top position and the bottom position of the target platform margin zone to be analyzed in the period based on the top-bottom horizon, and determine the stratigraphic interface between the top position and the bottom position as the top-bottom interface of the target platform margin zone to be analyzed in the period.

[0104] In an example, the first determining module is further configured to determine the top position and the bottom position of the target platform margin zone to be analyzed in the period based on the top-bottom horizon, obtain the maximum value, the minimum value of the stratigraphic thickness between the top position and the bottom position, and the horizontal distance between the top position and the bottom position, and determine the slope angle of the specified position in the strike direction of the target platform margin zone according to the maximum value, the minimum value and the horizontal distance.

[0105] Specifically, the first determining module can be specifically configured to determine the slope angle of the specified position in the strike direction of the target platform margin zone based on a first formula according to the maximum value, the minimum value and the horizontal distance.

[0106] The first formula includes:

[0107]

[0108] wherein H max , H min respectively represent the maximum value and the minimum value in the above formula, S represents the horizontal distance, and a represents the slope angle of the specified position.

[0109] In an example, the seismic attribute at least includes a zero-crossing point phase attribute, a chaos attribute and an entropy attribute.

[0110] In an example, the second determining module is configured to determine the number of cycles of the target platform margin zone based on the zero-crossing point phase attribute, determine the first width of the target platform margin zone based on the chaos attribute, determine the second width of the target platform margin zone based on the entropy attribute, compare the first width and the second width to determine a width comparison result, and determine the paleogeomorphology background of the target platform margin zone based on the number of cycles, 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] The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; and the data storage area can store data created according to the use of the computer and the like. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 502 can further include a memory remotely arranged with respect to the controller 501, which can be connected to the terminal / server through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

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

[0119] Embodiment Seven

[0120] The embodiments of the present application also provide a storage medium containing computer executable instructions, which, when executed by a computer controller, are used to perform a method for determining a platform rim belt palaeogeomorphology, the method comprising Figure 1 the steps shown.

[0121] From the above description of the embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary universal hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH memory, a hard disk, or an optical disc, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to perform the methods described in the various embodiments of the present application.

[0122] It is worth noting that the modules included in the above-mentioned device for determining a platform rim belt palaeogeomorphology are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized, and are not used to limit the protection scope of the present application.

[0123] It is to be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the application. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. It is further noted that characteristics relating to the different embodiments can be combined, and not just those within respective sections of the description.

Claims

1. A method of determining palaeotopography from a rim belt, characterised by, The method comprises: acquiring top and bottom layer positions of a target platform belt in a period to be analyzed; determining top and bottom interfaces of the target platform belt in the period to be analyzed based on the top and bottom layer positions of the target platform belt in the period to be analyzed, and determining a slope angle of a specified position in a strike direction of the target platform belt; analyzing a seismic attribute between the top and bottom interfaces, and determining a paleogeomorphic background of the target platform belt based on the seismic attribute and the slope angle.

2. The method of claim 1, wherein, The determination of the top and bottom interfaces of the target platform belt in the period to be analyzed based on the top and bottom layer positions comprises: determining a top position and a bottom position of the target platform belt in the period to be analyzed based on the top and bottom layer positions; determining a stratigraphic interface between the top position and the bottom position as the top and bottom interfaces of the target platform belt in the period to be analyzed.

3. The method of claim 1, wherein, The determination of the slope angle of the specified position in the strike direction of the target platform belt based on the top and bottom layer positions comprises: determining a top position and a bottom position of the target platform belt in the period to be analyzed based on the top and bottom layer positions; acquiring a maximum value and a minimum value of a stratigraphic thickness between the top position and the bottom position, and a horizontal distance between the top position and the bottom position; determining the slope angle of the specified position in the strike direction of the target platform belt according to the maximum value, the minimum value and the horizontal distance.

4. The method of claim 3, wherein, The determination of the slope angle of the specified position in the strike direction of the target platform belt according to the maximum value, the minimum value and the horizontal distance comprises: determining the slope angle of the specified position in the strike direction of the target platform belt based on a first formula according to the maximum value, the minimum value and the horizontal distance; wherein the first formula comprises: where H max , H min respectively denote the maximum value, the minimum value, S denotes the horizontal distance, and a denotes the slope angle at the specified location.

5. The method according to any one of claims 1 to 4, characterized in that, The seismic attribute at least comprises a zero-crossing point phase attribute, a chaos attribute and an entropy attribute.

6. The method of claim 5, wherein, The determination of the paleogeomorphic background of the target platform belt based on the seismic attribute and the slope angle comprises: determining a cycle number of the target platform belt based on the zero-crossing point phase attribute; determining a first width of the target platform belt based on the chaos attribute; determining a second width of the target platform belt based on the entropy attribute; performing width comparison on the first width and the second width to determine a width comparison result; determining the paleogeomorphic background of the target platform belt based on the cycle number, the width comparison result and the slope angle.

7. The method of claim 6, wherein, The determination of the paleogeomorphic background of the target platform belt based on the cycle number, the width comparison result and the slope angle comprises: determining a numerical interval to which the cycle number belongs; wherein the numerical interval comprises three numerical intervals from small to large; determining a numerical range to which a width of the target platform belt belongs according to the width comparison result; wherein the numerical range comprises three numerical ranges from small to large; determining an angle interval to which the slope angle belongs; wherein the angle interval comprises three angle intervals from low to high; in a case that the cycle number is located in a third numerical interval, the width is located in a first numerical range and the slope angle is located in a first angle interval, determining that the paleogeomorphic background of the target platform belt is a platform belt with a first range of paleogeomorphology. In a case where the number of cycles is located in the second numerical interval, the width is located in the second numerical range, and the slope angle is located in the third angle interval, it is determined that the target platform margin zone is located in a paleogeomorphology background of the platform margin zone belonging to the second range; In a case where the number of cycles is located in the first numerical interval, the width is located in the third numerical range, and the slope angle is located in the second angle interval, it is determined that the target platform margin zone is located in a paleogeomorphology background of the platform margin zone belonging to the second range; The paleogeomorphology belonging to the second range is higher than the paleogeomorphology belonging to the first range.

8. An apparatus for determining palaeotopography of a platform margin, characterised in that, The device comprises: an acquisition module configured to acquire top and bottom positions of a period to be analyzed of a target platform margin zone; a first determination module configured to determine a top and bottom interface of the period to be analyzed of the target platform margin zone and a slope angle of a specified position in a strike direction of the target platform margin zone based on the top and bottom positions of the period to be analyzed of the target platform margin zone; a second determination module configured to analyze a seismic attribute between the top and bottom interfaces, and determine a paleogeomorphology background of the target platform margin zone based on the seismic attribute and the slope angle.

9. A computer device, comprising: comprise: a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the method for determining a paleogeomorphology of a platform margin zone according to any one of claims 1-7 is implemented.

10. An apparatus readable storage medium having stored thereon a computer program, characterized in that, When the program is executed by the processor, the method for determining a paleogeomorphology of a platform margin zone according to any one of claims 1-7 is implemented.

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