Method and device for determining distribution of effective reservoirs in weathered granite crust

Abstract

This specification relates to the field of oil and gas exploration technology, specifically disclosing a method and apparatus for determining the effective reservoir distribution of granite weathering crust. The method includes: analyzing seismic facies types and distribution characteristics based on three-dimensional seismic data of the target granite weathering crust reservoir; extracting reservoir attribute characteristics of the target granite weathering crust reservoir along the layer using maximum amplitude attributes to obtain seismic sensitivity attribute distribution characteristics; delineating the vertical structure of the target granite weathering crust reservoir using well logging data; calibrating the vertical structure with the seismic facies types of the target granite weathering crust reservoir to establish a correspondence between seismic facies types and vertical structure; and determining the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, seismic sensitivity attribute distribution characteristics, and the correspondence between seismic facies types and vertical structure. This method can accurately determine the effective reservoir distribution characteristics.

Description

Technical Field

[0001] This specification relates to the field of oil and gas exploration technology, and in particular to a method and apparatus for determining the effective reservoir distribution of granite weathering crust. Background Technology

[0002] Granite weathering crust reservoirs are characterized by diverse types and complex distributions, posing significant challenges to reservoir distribution prediction. Existing studies mostly focus on a single perspective when predicting effective reservoirs within the granite weathering crust. For example, predicting reservoir distribution solely from a geological standpoint using well profile analysis requires extensive well data and is unsuitable for predicting the distribution of weathering crust reservoirs in sparsely populated or well-free areas. Seismic prediction, on the other hand, focuses on seismic wave group characteristics, seismic attributes, and pre-stack elastic parameter inversion, neglecting the study of weathering crust geological characteristics. This results in relatively simplistic methods and the lack of a comprehensive and effective prediction approach. Furthermore, the response relationship between seismic reflection characteristics and the granite weathering crust structure remains unclear, leading to ambiguous geological significance of weathering crust seismic reflection characteristics. Therefore, predicting the effective reservoir distribution characteristics of granite weathering crusts using only single geological or seismic data often yields results that fail to meet exploration needs.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This specification provides a method and apparatus for determining the distribution of effective reservoirs in granite weathering crust, in order to solve the problem that existing methods for predicting effective reservoirs in granite weathering crust cannot meet exploration needs.

[0005] This specification provides an embodiment of a method for determining the effective reservoir distribution in the weathering crust of granite, including:

[0006] Based on the three-dimensional seismic data of the target granite weathered crust reservoir, the seismic facies type and seismic facies distribution characteristics of the target granite weathered crust reservoir are analyzed.

[0007] The reservoir attribute characteristics of the target granite weathering crust reservoir are extracted along the layer using the maximum amplitude attribute, and the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir are obtained.

[0008] Using well logging data of the target granite weathered crust reservoir, the vertical structure of the target granite weathered crust reservoir is delineated; the vertical structure of the target granite weathered crust reservoir is calibrated with the seismic facies type of the target granite weathered crust reservoir, and the correspondence between the seismic facies type and the vertical structure is established;

[0009] Based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the longitudinal structure, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined.

[0010] In one embodiment, based on three-dimensional seismic data of the target granite weathering crust reservoir, the seismic facies type and seismic facies distribution characteristics of the target granite weathering crust reservoir are analyzed, including:

[0011] Based on the frequency, morphology, continuity, and amplitude energy of the seismic reflection phase axes of the target granite weathering crust reservoir, the seismic facies types of the target granite weathering crust reservoir are divided into three types: low-frequency continuous strong amplitude facies, medium-frequency low-continuous medium amplitude facies, and weak amplitude-blank facies.

[0012] The seismic facies plane distribution characteristics of the target granite weathering crust reservoir were analyzed by combining planar and cross-sectional methods.

[0013] In one embodiment, the reservoir attribute characteristics of the target granite weathering crust reservoir are extracted along the layers using the maximum amplitude attribute, to obtain the seismic sensitivity attribute distribution characteristics of the target granite weathering crust reservoir, including:

[0014] The attribute features of the top of the target granite weathering crust reservoir are extracted using the first time window to obtain the distribution features of the reservoir at the top of the weathering crust.

[0015] Based on the seismic reflection characteristics of the target granite weathered crust reservoir, a second time window is determined; the seismic attribute characteristics of the middle part of the target granite weathered crust reservoir are extracted using the second time window to obtain the distribution characteristics of the reservoir below the top of the weathered crust.

[0016] Based on the distribution characteristics of the reservoir at the top of the weathering crust and the distribution characteristics of the reservoir below the top of the weathering crust, the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir are determined.

[0017] In one embodiment, using well logging data from the target granite weathering crust reservoir, the vertical structure of the target granite weathering crust reservoir is delineated, including:

[0018] Based on the comprehensive response characteristics of sonic transit time logging curves, deep and shallow dual lateral logging curves, compensated neutron logging curves, and well core characteristics, the vertical structure of the target granite weathering crust reservoir is divided into residual layer, dissolution layer, and disintegration layer.

[0019] In one embodiment, the vertical structure of the target granite weathered crust reservoir is calibrated with the seismic facies type of the target granite weathered crust reservoir, and a correspondence between the seismic facies type and the vertical structure is established, including:

[0020] The types of longitudinal structures of the weathering crust are labeled with the types of seismic facies: medium frequency low continuous medium amplitude corresponds to the dissolution layer, low frequency continuous strong amplitude corresponds to the residual layer, and weak amplitude-blank corresponds to the disintegration layer, thus establishing the correspondence between the weathering crust structure and the seismic facies.

[0021] Based on the reservoir space combination type, porosity and permeability characteristics, oil content and preservation conditions of the target granite weathering crust reservoir, the effective reservoir types of granite weathering crust are classified as follows: medium-frequency low continuous medium amplitude corresponding to dissolution layer, which is a type I effective reservoir; low-frequency continuous strong amplitude corresponding to residual layer, which is a type II effective reservoir; weak amplitude - blank corresponding to disintegration layer, which is a type III effective reservoir.

[0022] In one embodiment, determining the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure includes:

[0023] For areas with exploratory wells, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined based on the weathering crust profile characteristics of the wells.

[0024] For areas without exploratory wells, based on the distribution characteristics of seismic sensitive attributes and the correspondence between the seismic facies type and the vertical structure, and in combination with the distribution characteristics of seismic facies and the seismic sensitive attributes, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined.

[0025] In one embodiment, after determining the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, the method further includes:

[0026] Based on the effective reservoir distribution characteristics, oil-bearing data, and hydrocarbon accumulation conditions of the target granite weathering crust reservoir, the target reservoir exploration direction of the target granite weathering crust reservoir is determined.

[0027] This specification also provides an embodiment of a device for determining the effective reservoir distribution of granite weathering crust, comprising:

[0028] The analysis module is used to analyze the seismic facies type and seismic facies distribution characteristics of the target granite weathering crust reservoir based on the three-dimensional seismic data of the target granite weathering crust reservoir;

[0029] The extraction module is used to extract the reservoir attribute features of the target granite weathering crust reservoir along the layer using the maximum amplitude attribute, and obtain the seismic sensitivity attribute distribution features of the target granite weathering crust reservoir;

[0030] A module is established to delineate the vertical structure of the target granite weathered crust reservoir using well logging data; it is also used to calibrate the vertical structure of the target granite weathered crust reservoir with the seismic facies type of the target granite weathered crust reservoir, and establish the correspondence between the seismic facies type and the vertical structure.

[0031] The determination module is used to determine the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure.

[0032] This specification also provides a computer device, including a processor and a memory for storing processor-executable instructions, wherein the processor executes the instructions to implement the steps of the method for determining the effective reservoir distribution of granite weathering crust described in any of the above embodiments.

[0033] This specification also provides a computer-readable storage medium storing computer instructions that, when executed, implement the steps of the method for determining the effective reservoir distribution of granite weathering crust described in any of the above embodiments.

[0034] This specification provides an embodiment of a method for determining the effective reservoir distribution of a granite weathering crust. Based on three-dimensional seismic data of a target granite weathering crust reservoir, the method analyzes the seismic facies type and distribution characteristics of the target granite weathering crust reservoir. It extracts reservoir attribute characteristics along the layers using the maximum amplitude attribute, obtaining the seismic sensitivity attribute distribution characteristics of the target granite weathering crust reservoir. Using well logging data of the target granite weathering crust reservoir, the vertical structure of the target granite weathering crust reservoir is delineated. Then, the vertical structure of the target granite weathering crust reservoir is calibrated with its seismic facies type, establishing a correspondence between the seismic facies type and the vertical structure. Based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, the effective reservoir distribution characteristics of the target granite weathering crust reservoir can be determined. The above scheme analyzes the typical seismic facies types and distribution characteristics of granite weathering crust reservoirs, studies the distribution characteristics of seismic sensitivity attributes of different structural layers at the top and below the granite weathering crust reservoirs, analyzes the response relationship between granite seismic facies and weathering crust structure, clarifies the geological genesis of seismic facies, and, based on the distribution characteristics of seismic facies and seismic sensitivity attributes, comprehensively determines the distribution characteristics of effective reservoirs by combining well profiles of weathering crust reservoirs. This scheme adopts a combined geological-seismic approach, with seismic prediction methods as the mainstay, while closely integrating geological interpretation. It clarifies the response relationship between granite seismic facies types and weathering crust structure, and can characterize the type of effective reservoirs in granite weathering crust based on seismic reflection characteristics, providing a clear direction for favorable reservoir exploration and effectively solving the problem of predicting the distribution of granite weathering crust reservoirs. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of this specification and form part of it, do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 A flowchart of a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification is shown;

[0037] Figure 2 A flowchart of a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification is shown;

[0038] Figure 3 This document shows a schematic diagram illustrating the effective reservoir type classification in a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification.

[0039] Figure 4A schematic diagram of the comprehensive prediction of effective reservoir distribution in the method for determining the effective reservoir distribution of granite weathering crust in one embodiment of this specification is shown.

[0040] Figure 5 A schematic diagram of the structure of the device for determining the effective reservoir distribution of granite weathering crust in one embodiment of this specification is shown;

[0041] Figure 6 A schematic diagram of a computer device according to one embodiment of this specification is shown. Detailed Implementation

[0042] The principles and spirit of this specification will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0043] Those skilled in the art will recognize that the embodiments described in this specification can be implemented as a system, apparatus, method, or computer program product. Therefore, the disclosure of this specification can be specifically implemented in the following forms: entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0044] Through research, the inventors discovered that by combining geological and seismic approaches, they proposed a comprehensive prediction method that is currently the most effective way to predict granite weathering crust reservoirs.

[0045] Based on this, the embodiments of this specification provide a method for determining the effective reservoir distribution of granite weathering crust. Figure 1 A flowchart illustrating a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification is provided. While this specification provides method operation steps or apparatus structures as shown in the following embodiments or figures, more or fewer operation steps or module units may be included in the method or apparatus based on conventional or non-inventive effort. In steps or structures where there is no logically necessary causal relationship, the execution order of these steps or the module structure of the apparatus is not limited to the execution order or module structure described in the embodiments and figures of this specification. When the method or module structure is applied in actual devices or end products, it can be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed processing environment) according to the method or module structure shown in the embodiments or figures.

[0046] Specifically, such as Figure 1As shown, a method for determining the effective reservoir distribution of granite weathering crust provided in one embodiment of this specification may include the following steps:

[0047] Step S101: Based on the three-dimensional seismic data of the target granite weathering crust reservoir, analyze the seismic facies type and seismic facies distribution characteristics of the target granite weathering crust reservoir.

[0048] The methods described in this specification can be applied to computer equipment. Three-dimensional seismic data of the target granite weathered crust reservoir to be predicted can be acquired. Subsequently, based on the three-dimensional seismic data of the target granite weathered crust reservoir, the seismic facies type and seismic facies distribution characteristics of the target granite weathered crust reservoir can be analyzed.

[0049] A seismic facies refers to a seismic reflection unit within a certain range. If the seismic attribute parameters within a unit differ from those of adjacent units, then that seismic reflection unit belongs to a seismic facies type. Seismic attribute parameters can include at least one of the following: the internal structure of the seismic phase axis, top-to-bottom contact relationship, amplitude, frequency, continuity, apparent period, layer velocity, and lateral variations in reflection characteristics. Each seismic facies type on a seismic profile has a corresponding projection on the plane. The projection range of the same type of seismic facies on the plane is usually delineated, corresponding to the planar distribution characteristics of that seismic facies, i.e., the planar distribution range of that seismic facies.

[0050] In some embodiments of this specification, based on three-dimensional seismic data of the target granite weathered crust reservoir, the analysis of the seismic facies type and distribution characteristics of the target granite weathered crust reservoir may include: classifying the seismic facies type of the target granite weathered crust reservoir into three types according to the frequency, shape, continuity, and amplitude energy intensity of the seismic reflection phase axes of the target granite weathered crust reservoir: low-frequency continuous strong amplitude facies, mid-frequency low-continuous medium amplitude facies, and weak amplitude-blank facies; and analyzing the planar distribution characteristics of the seismic facies of the target granite weathered crust reservoir through a combination of planar and cross-sectional methods.

[0051] Specifically, earthquake phase types can be classified based on the frequency, shape, continuity, and amplitude energy of the seismic reflection phase axis. Those with low frequency, continuous and stable seismic phase axis, and strong amplitude energy are classified as low-frequency continuous strong amplitude phases; those with medium frequency and amplitude energy but poor seismic phase axis continuity are classified as medium-frequency low-continuous medium amplitude phases; and those with weak amplitude energy are classified as weak amplitude-blank phases.

[0052] In one embodiment, frequencies lower than the first frequency can be defined as low frequencies, and frequencies between the first and second frequencies can be defined as mid frequencies. The second frequency is higher than the first frequency, and the first and second frequencies can be set according to actual needs.

[0053] In one embodiment, amplitude energies with an amplitude energy lower than the first amplitude energy can be defined as weak amplitudes, amplitude energies with an amplitude energy between the first and second amplitude energies can be defined as medium amplitudes, and amplitude energies with an amplitude energy higher than the second amplitude energy can be defined as strong amplitudes. The second amplitude energy is higher than the first amplitude energy, and the first and second amplitude energies can be set according to actual needs.

[0054] In one embodiment, a continuity index can be used to characterize continuity; the higher the continuity index, the more stable the continuity. Correspondingly, a continuity index lower than a first continuity index can be defined as low continuity or poor continuity, while a continuity index higher than a second continuity index can be defined as continuous and stable. The second continuity index can be higher than or equal to the first continuity index, and both the first and second continuity indices can be set according to actual needs.

[0055] To determine the planar distribution characteristics of seismic phases, the above-mentioned seismic phase types can be identified and interpreted on the profile based on the 5×5 profile interpretation accuracy. Then, combined with the projection of the seismic phases on the plane, the distribution range of the seismic phases on the plane can be determined, and the distribution patterns of various seismic phases can be analyzed to obtain the planar distribution characteristics of seismic phases.

[0056] Step S102: Extract the reservoir attribute features of the target granite weathering crust reservoir along the layer using the maximum amplitude attribute, and obtain the seismic sensitivity attribute distribution features of the target granite weathering crust reservoir.

[0057] The reservoir attribute characteristics of the target granite weathering crust reservoir can be extracted along the layers using the maximum amplitude attribute, thus obtaining the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir. Since the top of the granite weathering crust exhibits low-frequency continuous strong amplitude reflection characteristics, the reservoir attribute characteristics here can include the distribution characteristics of the reservoir at the top of the weathering crust and the distribution characteristics of the reservoir below the top of the weathering crust.

[0058] In some embodiments of this specification, the reservoir attribute features of the target granite weathered crust reservoir are extracted along the layers using the maximum amplitude attribute to obtain the seismic sensitivity attribute distribution features of the target granite weathered crust reservoir. This may include: extracting attribute features of the top of the target granite weathered crust reservoir using a first time window to obtain the distribution features of the reservoir at the top of the weathered crust; determining a second time window based on the seismic reflection features of the target granite weathered crust reservoir; extracting seismic attribute features of the middle part of the target granite weathered crust reservoir using the second time window to obtain the distribution features of the reservoir below the top of the weathered crust; and determining the seismic sensitivity attribute distribution features of the target granite weathered crust reservoir based on the distribution features of the reservoir at the top of the weathered crust and the distribution features of the reservoir below the top of the weathered crust.

[0059] Due to the vertical zonation of granite weathering crust reservoirs, there are significant differences in the attribute characteristics of the top and below. Therefore, it is necessary to reasonably set different time windows and use the maximum amplitude attribute to extract the attribute characteristics of the top and below the top of the granite weathering crust reservoir along the layers, and analyze the differences between them. First, a reasonable first time window is set to extract the attribute characteristics of the top of the granite weathering crust, and study the distribution characteristics of the reservoir at the top of the weathering crust. Then, based on the reflection characteristics of the weathering crust in seismic events, a second time window is set to extract the seismic attribute characteristics of the middle of the weathering crust, and study the distribution characteristics of the reservoir below the top of the weathering crust. Finally, the distribution characteristics of the reservoir at the top of the weathering crust and the distribution characteristics of the reservoir below the top of the weathering crust are compared and analyzed to obtain the differences between them, thereby determining the seismically sensitive attribute distribution characteristics of the target granite weathering crust reservoir.

[0060] The distribution characteristics of seismic sensitive attributes can be summarized in two aspects: the type of seismic sensitive attribute and the distribution range and location characteristics of each type. Regarding the type of seismic sensitive attribute, due to the influence of the time window setting during attribute extraction, the types of attributes at the top and middle of the granite weathering crust differ. Generally, the types of sensitive attributes at the top can be divided into three categories: strong amplitude, medium amplitude, and weak amplitude attributes, while the types of sensitive attributes in the middle only include medium amplitude and weak amplitude attributes. Regarding the distribution range and location characteristics of each seismic sensitive attribute, due to the influence of the time window, the size and location of the distribution range of each seismic sensitive attribute on the plane vary.

[0061] Step S103: Using the logging data of the target granite weathered crust reservoir, the vertical structure of the target granite weathered crust reservoir is delineated; the vertical structure of the target granite weathered crust reservoir is calibrated with the seismic facies type of the target granite weathered crust reservoir, and the correspondence between the seismic facies type and the vertical structure is established.

[0062] Well logging data from the target granite weathered crust reservoir can be used to delineate the vertical structure of the reservoir. Then, the vertical structure of the target granite weathered crust reservoir is correlated with its seismic facies type to establish a correspondence between the seismic facies type and the vertical structure, thereby elucidating the geological origin of the seismic facies.

[0063] In some embodiments of this specification, the vertical structure of the target granite weathered crust reservoir is divided using well logging data. This may include: dividing the vertical structure of the target granite weathered crust reservoir into residual layers, dissolution layers, and disintegration layers based on the comprehensive response characteristics of sonic transit time logging curves, deep and shallow dual lateral logging curves, compensated neutron logging curves, and well core characteristics on a single well.

[0064] Specifically, the longitudinal structure of granite weathering crust can be divided into residual layer, dissolution layer, and disintegration layer based on the comprehensive response characteristics of acoustic transit time logging (AC), deep and shallow dual lateral logging (LLD, LLS), compensated neutron logging (CNL) curves, and well core characteristics on a single well.

[0065] The residual layer can be a product of highly weathered granite bodies. The core is generally loose and broken, the rock structure has been destroyed, and the main component is residual gravel, which can form a discontinuous thin shell covering the bedrock.

[0066] The weathering degree of the dissolution layer is moderate, and obvious dissolution pores and dissolution fractures can be seen in the core, indicating that although it has undergone a certain degree of weathering, the overall structure of the rock is well preserved, and dissolution is the main stress of reservoir formation.

[0067] The disintegration layer can be a product of the bedrock with a low degree of weathering. High-angle cracks can be seen in some core samples. The rock is relatively dense, with a well-preserved structure and obvious blocky characteristics.

[0068] In some embodiments of this specification, the longitudinal structure of the target granite weathering crust reservoir is calibrated with the seismic facies type of the target granite weathering crust reservoir, establishing a correspondence between the seismic facies type and the longitudinal structure. This may include: calibrating the types of the divided longitudinal weathering crust structures with seismic facies types: medium-frequency low-continuous medium-amplitude corresponds to dissolution layers, low-frequency continuous high-amplitude corresponds to residual layers, and weak-amplitude blank corresponds to disintegration layers, establishing a correspondence between weathering crust structures and seismic facies; based on the reservoir space combination type, porosity and permeability characteristics, oil content, and preservation conditions of the target granite weathering crust reservoir, the types of effective granite weathering crust reservoirs are classified: medium-frequency low-continuous medium-amplitude corresponds to dissolution layers, which are Class I effective reservoirs; low-frequency continuous high-amplitude corresponds to residual layers, which are Class II effective reservoirs; and weak-amplitude blank corresponds to disintegration layers, which are Class III effective reservoirs.

[0069] Specifically, the weathering crust structure can be mapped to seismic facies, with medium-frequency, low-continuous, medium-amplitude seismic waves corresponding to dissolution layers, low-frequency, continuous, high-amplitude seismic waves corresponding to residual layers, and weak-amplitude, blank areas corresponding to disintegration layers, thus establishing a correspondence between weathering crust structure and seismic facies. Further, based on the reservoir space combination type, porosity and permeability characteristics, oil content, and preservation conditions, the effective reservoir types of the granite weathering crust are classified. Specifically, medium-frequency, low-continuous, medium-amplitude seismic waves correspond to dissolution layers, classifying them as Class I effective reservoirs; low-frequency, continuous, high-amplitude seismic waves correspond to residual layers, classifying them as Class II effective reservoirs; and weak-amplitude, blank areas correspond to disintegration layers, classifying them as Class III effective reservoirs.

[0070] Step S104: Based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, determine the effective reservoir distribution characteristics of the target granite weathering crust reservoir.

[0071] After obtaining the seismic phase distribution characteristics, seismic sensitivity attribute distribution characteristics, and the correspondence between seismic phase types and vertical structures, the effective reservoir distribution characteristics of the target granite weathering crust reservoir can be determined.

[0072] An effective reservoir refers to a reservoir in which fluids (oil, gas, water) can be stored and permeate under formation conditions. A reservoir that cannot store fluids or whose stored fluids cannot permeate under current technological conditions is considered an ineffective reservoir.

[0073] The characteristics of effective reservoir distribution can include the type of effective reservoir, the distribution range and location of each type of effective reservoir, and the elevation corresponding to each type of effective reservoir distribution.

[0074] In some embodiments of this specification, the effective reservoir distribution characteristics of the target granite weathered crust reservoir are determined based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure. This includes: for areas with exploratory wells, determining the effective reservoir distribution characteristics of the target granite weathered crust reservoir based on the weathered crust profile characteristics of the interconnected wells; for areas without exploratory wells, determining the effective reservoir distribution characteristics of the target granite weathered crust reservoir by combining the seismic facies distribution characteristics and the seismic sensitivity attribute characteristics with the correspondence between the seismic sensitivity attribute distribution characteristics and the seismic facies type and the vertical structure.

[0075] Specifically, the distribution of effective reservoirs in the weathered crust of granite can be predicted through a comprehensive analysis of two aspects. First, in areas with exploratory wells, the distribution of weathered crust reservoirs can be predicted by analyzing the weathered crust profile characteristics of connected wells. Second, in areas with few or no exploratory wells, the distribution of effective granite reservoirs can be predicted by clarifying the correspondence between seismic facies and effective reservoirs, combined with the planar distribution characteristics of seismic facies and the distribution characteristics of seismic sensitivity attributes. By combining the results of these two aspects, the distribution of weathered crust reservoirs in the entire study area can be predicted.

[0076] In the above embodiments, by analyzing the typical seismic facies types and distribution characteristics of granite weathering crust reservoirs, the distribution characteristics of seismic sensitivity attributes of different structural layers at the top and below the granite weathering crust reservoirs were studied. The response relationship between granite seismic facies and weathering crust structure was analyzed, clarifying the geological genesis of the seismic facies. Based on the distribution characteristics of seismic facies and the distribution characteristics of seismic sensitivity attributes, and combined with the well profile of the weathering crust reservoir, the effective reservoir distribution characteristics were comprehensively determined. This scheme adopts a combined geological-seismic approach, with seismic prediction methods as the main approach, while closely integrating geological interpretation. It clarifies the response relationship between granite seismic facies types and weathering crust structure, and can characterize the type of effective reservoir in granite weathering crust based on seismic reflection characteristics, providing a clear direction for favorable reservoir exploration and effectively solving the problem of predicting the distribution of granite weathering crust reservoirs.

[0077] In some embodiments of this specification, after determining the effective reservoir distribution characteristics of the target granite weathered crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, the method may further include: determining the target reservoir exploration direction of the target granite weathered crust reservoir based on the effective reservoir distribution characteristics, oil-bearing data, and hydrocarbon accumulation conditions of the target granite weathered crust reservoir.

[0078] The target reservoir exploration direction can be a favorable reservoir exploration direction. A favorable reservoir exploration direction refers to a direction with good reservoir properties, which is conducive to the accumulation and preservation of oil and gas and can form oil and gas reservoirs. It is a comprehensive selection based on the determination of effective reservoir distribution characteristics, combined with oil-bearing characteristics and oil and gas accumulation conditions, and has relatively good exploration benefits.

[0079] Specifically, by combining oil testing data, the oil-bearing characteristics of different seismic facies can be determined. Simultaneously, the reservoir formation conditions of existing oil reservoirs in the work area can be analyzed. Finally, a comprehensive analysis can be conducted to identify favorable reservoir exploration directions. Seismic facies and corresponding reservoir oil-bearing data can be calibrated. Through statistical analysis, the oil-bearing characteristics of reservoirs corresponding to different seismic facies can be further clarified. At the same time, the reservoir formation conditions of existing oil reservoirs in the work area can be analyzed, and the hydrocarbon accumulation conditions of reservoirs corresponding to different seismic facies types can be analyzed. Through comparative analysis, based on a clear understanding of the effective reservoir distribution characteristics, favorable reservoir exploration directions can be further optimized.

[0080] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. For details, please refer to the foregoing descriptions of the relevant processing embodiments; they will not be repeated here.

[0081] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0082] The above method will be described below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this specification and does not constitute an improper limitation of this specification.

[0083] This specification provides a method for determining the effective reservoir distribution of granite weathering crust. The method in this embodiment utilizes a combined geological and seismic approach. Based on the classification of granite weathering crust reservoir types, it clarifies the response relationship between granite weathering crust reservoir types and seismic reflections. This allows for the characterization of granite weathering crust reservoir types based on seismic reflection characteristics, and provides a clear direction for favorable reservoir exploration based on the oil-bearing characteristics of seismic facies and the corresponding hydrocarbon accumulation conditions. This specification's embodiment employs a well-seismic combined method to calibrate the weathering crust structure of a single well with seismic reflections, assigning corresponding geological meanings to the seismic reflection characteristics. Based on this, combined with the planar distribution characteristics of seismic facies, seismic attribute characteristics, and well-connected profiles of the weathering crust, the distribution of granite weathering crust reservoirs can be predicted. This method can minimize exploration risks and overcome the limitation of relying on a large amount of exploration well data for research. It provides a new approach for predicting the distribution of granite weathering crust reservoirs in low-exploration areas and has achieved good application results in actual exploration.

[0084] Please refer to Figure 2 The flowchart illustrates a method for determining the effective reservoir distribution of granite weathering crust in embodiments of this specification. Figure 2 As shown, the method may include the following steps:

[0085] 1) Analysis of seismic facies types and distribution characteristics of granite weathering crust reservoirs: Seismic facies types are divided into three types: low-frequency continuous strong amplitude facies, medium-frequency low-continuous medium amplitude facies, and weak amplitude-blank facies. The planar distribution characteristics of seismic facies in granite weathering crust reservoirs are studied by combining planar and profile methods.

[0086] The classification criteria for seismic phases are as follows: seismic phase types are classified based on the frequency, morphology, continuity, and amplitude energy of the seismic reflection phase axis. Those with low frequency, continuous and stable seismic phase axes, and strong amplitude energy are classified as low-frequency continuous strong amplitude phases; those with medium frequency and amplitude energy but poor seismic phase axis continuity are classified as medium-frequency low-frequency continuous medium amplitude phases; and those with weak amplitude energy are classified as weak amplitude-blank phases. The method for determining the planar distribution characteristics of seismic phases is as follows: based on a 5×5 profile interpretation accuracy, the above seismic phase types are identified and interpreted on the profile. Then, combined with the projection of the seismic phases onto the plane, the distribution range of the seismic phases on the plane is determined, and the distribution patterns of various seismic phases are analyzed.

[0087] 2) Analysis of the distribution characteristics of seismic sensitive attributes of granite weathering crust reservoirs: Different time windows were set, and the maximum amplitude attribute was used to extract the reservoir attribute characteristics of the top and bottom of the granite weathering crust along the layer.

[0088] The method for extracting the distribution characteristics of seismic sensitive attributes of granite weathering crust reservoirs is as follows: Since the top of the granite weathering crust exhibits low-frequency, continuous, high-amplitude reflection characteristics, a reasonable time window is first set to specifically extract the attribute characteristics of the top of the granite weathering crust, studying the distribution characteristics of the reservoir at the top of the weathering crust. Subsequently, based on the reflection characteristics of the weathering crust in earthquakes, another time window is set to specifically extract the seismic attribute characteristics of the middle part of the weathering crust, used to study the distribution characteristics of the reservoir below the top of the weathering crust.

[0089] 3) Classify the effective reservoir types of granite weathering crust. On a single well, classify the longitudinal structure of granite weathering crust (residual layer, dissolution layer, disintegration layer) based on the comprehensive response characteristics of the main logging curves and core characteristics. Then, calibrate the seismic facies type with the weathering crust structure, establish the correspondence between the seismic facies and the weathering crust structure, and classify the effective reservoir types according to the physical properties of each layer of the weathering crust.

[0090] Specifically, the vertical structure of granite weathering crust (residual layer, dissolution layer, and disintegration layer) can be delineated on a single well based on the comprehensive response characteristics of acoustic transit time (AC), deep and shallow dual lateral logging (LLD, LLS), compensated neutron logging (CNL), and well core characteristics. Then, the delineated weathering crust structure is calibrated with seismic facies: medium-frequency low-continuous medium-amplitude seismic waves correspond to dissolution layers, low-frequency continuous high-amplitude seismic waves correspond to residual layers, and weak-amplitude blank seismic waves correspond to disintegration layers. This establishes a correspondence between weathering crust structure and seismic facies. Furthermore, based on the reservoir space combination type, porosity and permeability characteristics, oil content, and preservation conditions, the effective reservoir type of granite weathering crust is determined. Specifically, medium-frequency low-continuous medium-amplitude seismic waves correspond to dissolution layers (Class I effective reservoir), low-frequency continuous high-amplitude seismic waves correspond to residual layers (Class II effective reservoir), and weak-amplitude blank seismic waves correspond to disintegration layers (Class III effective reservoir).

[0091] 4) Prediction of effective reservoir distribution in granite weathering crust: Based on the distribution characteristics of seismic facies and seismic sensitivity attributes, and combined with the well profile characteristics of granite weathering crust, the effective reservoir distribution in granite weathering crust is predicted in a comprehensive manner.

[0092] Specifically, the distribution of effective reservoirs in the weathered crust of granite can be predicted through a comprehensive analysis of two aspects. First, in areas with exploratory wells, the distribution of weathered crust reservoirs can be predicted by analyzing the weathered crust profile characteristics of connected wells. Second, in areas with few or no exploratory wells, the distribution of effective granite reservoirs can be predicted by clarifying the correspondence between seismic facies and effective reservoirs, combined with the planar distribution characteristics and attribute distribution characteristics of seismic facies. By combining the results of these two aspects, the distribution of weathered crust reservoirs in the entire study area can be predicted.

[0093] 5) Predict favorable reservoir exploration directions. Combine oil testing data to determine the oil-bearing characteristics of different seismic facies. At the same time, analyze the reservoir formation conditions of the discovered oil reservoirs in the work area. Finally, conduct a comprehensive analysis to point out favorable reservoir exploration directions.

[0094] Specifically, seismic facies and corresponding reservoir oil-bearing data can be calibrated. Through statistical analysis, the oil-bearing characteristics of reservoirs corresponding to different seismic facies can be further clarified. At the same time, the formation conditions of existing oil reservoirs in the work area can be analyzed, and the oil and gas formation conditions of reservoirs corresponding to different seismic facies types can be analyzed. Through analogy analysis, based on the clear distribution characteristics of effective reservoirs, the exploration direction of favorable reservoirs can be further optimized.

[0095] The geological data collected in the embodiments of this specification mainly comes from 30 wells in the northern belt of the Dongying Depression of Shengli Oilfield, which contain granite weathering crust. Core data comes from 120m cores from 8 wells. Conventional logging data mainly includes natural gamma curves (GR), density curves (DEN), neutron porosity curves (CNL), sonic transit time curves (AC), and deep and shallow dual lateral resistivity curves (LLD, LLS). Oil testing data mainly comes from 7 wells. By calibrating the weathering crust structure of 20 single wells with seismic facies types, a good correspondence was found between the two: low-frequency continuous strong amplitude corresponds to residual layers, medium-frequency low continuous medium amplitude corresponds to dissolution layers, and weak amplitude-blank corresponds to disintegration layers. By establishing the correspondence between the two, the remaining 10 wells were calibrated, and the match rate reached 95%, effectively confirming the rationality of using seismic facies types to characterize weathering crust structures.

[0096] Please refer to Figure 3 This diagram illustrates the effective reservoir type classification in a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification. Figure 3 The example illustrates that effective reservoir types in granite weathering crust can be classified into three categories. Category I effective reservoirs are dissolution layers, corresponding to medium-frequency, low-continuous, medium-amplitude facies. These reservoirs exhibit good reservoir space combinations, moderate porosity and permeability, good preservation conditions, and oil-bearing characteristics. Category II effective reservoirs are residual layers, corresponding to low-frequency, continuous, high-amplitude facies. While these reservoirs possess good reservoir space combinations, moderate porosity and permeability, they are thinner, have poorer preservation conditions, and exhibit poorer oil-bearing characteristics. Category III effective reservoirs are disintegration layers, corresponding to weak-amplitude, blank facies. These reservoirs have a single reservoir space type, dominated by fractures, and exhibit low porosity and permeability, poor preservation conditions, and poorer oil-bearing characteristics. This classification scheme indicates that the weathering crust of granite has corresponding reflection characteristics in earthquakes. On the other hand, it also reveals that the physical properties of reservoirs corresponding to different earthquake reflection characteristics are different. Therefore, based on this classification method, the type and physical properties of effective reservoirs can be qualitatively determined by analyzing the seismic facies characteristics of the weathering crust of granite.

[0097] Please refer to Figure 4 This diagram illustrates a comprehensive prediction of the effective reservoir distribution in a method for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification. Figure 4 The example shown is the distribution of effective reservoirs in the weathered crust of granite in the western section of the northern belt of the Dongying Depression. Figure 4The data shows that Type I effective reservoirs are distributed on relatively low-altitude slopes in the central and western parts of the study area, exhibiting a distinct east-west striped distribution pattern, mainly corresponding to the development zone of medium-frequency, low-continuous, medium-amplitude facies. Type II effective reservoirs are distributed on gentle slopes near structural high points in the northern and southwestern parts of the study area, significantly influenced by elevation, mainly corresponding to the development zone of low-frequency, continuous, strong-amplitude facies. Type III effective reservoirs are widely distributed, developing at different depths, corresponding to weak-amplitude to blank facies. Furthermore, it is indicated that Type I effective reservoirs located in the development zone of medium-frequency, low-continuous, medium-amplitude facies are the most favorable reservoir development zones. Comparison of these predictions with drilling oil and gas test results reveals that Type I effective reservoir distribution areas mainly consist of oil layers and oil-bearing water layers, Type II effective reservoir distribution areas mainly consist of poor-quality oil layers and water layers, while Type III effective reservoir distribution areas mainly consist of water layers and dry layers. The prediction results show a 95% agreement with drilling data, demonstrating good application effectiveness.

[0098] This specification provides a method for determining the effective reservoir distribution of granite weathering crust in its embodiments. This method allows for comprehensive prediction of granite weathering crust reservoirs. Compared to existing methods, the advantages of this embodiment are: it fully utilizes comprehensive geological and seismic data from oilfields or research institutes, elucidates the seismic response characteristics of different structural layers in the granite weathering crust, clarifies the geological genesis of seismic facies in the granite weathering crust, characterizes the type of effective reservoir in the granite weathering crust based on seismic reflection characteristics, and provides a clear direction for favorable reservoir exploration based on the oil-bearing characteristics of seismic facies and the corresponding reservoir's hydrocarbon accumulation conditions. This method overcomes the limitation of relying on a large amount of well data for research, providing a new approach to predicting the distribution of granite weathering crust reservoirs in low-exploration areas. Furthermore, by fully integrating geological data (well logging, drilling, and oil and gas testing) and seismic data, the accuracy of effective reservoir distribution prediction is significantly improved, greatly reducing exploration risks.

[0099] Based on the same inventive concept, this specification also provides an apparatus for determining the effective reservoir distribution of granite weathering crust, as described in the following embodiments. Since the principle of the apparatus for determining the effective reservoir distribution of granite weathering crust is similar to that of the method for determining the effective reservoir distribution of granite weathering crust, the implementation of the apparatus can refer to the implementation of the method for determining the effective reservoir distribution of granite weathering crust, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated. Figure 5 This is a structural block diagram of a device for determining the effective reservoir distribution of granite weathering crust according to an embodiment of this specification, such as... Figure 5As shown, it includes: analysis module 501, extraction module 502, creation module 503 and determination module 504. The structure is described below.

[0100] Analysis module 501 is used to analyze the seismic facies type and seismic facies distribution characteristics of the target granite weathering crust reservoir based on the three-dimensional seismic data of the target granite weathering crust reservoir.

[0101] The extraction module 502 is used to extract the reservoir attribute features of the target granite weathering crust reservoir along the layer using the maximum amplitude attribute, and obtain the seismic sensitivity attribute distribution features of the target granite weathering crust reservoir.

[0102] The module 503 is used to delineate the vertical structure of the target granite weathered crust reservoir using well logging data; it is also used to calibrate the vertical structure of the target granite weathered crust reservoir with the seismic facies type of the target granite weathered crust reservoir, and establish the correspondence between the seismic facies type and the vertical structure.

[0103] The determination module 504 is used to determine the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure.

[0104] In some embodiments of this specification, the analysis module may be specifically used to: classify the seismic facies of the target granite weathering crust reservoir into three types based on the frequency, shape, continuity, and amplitude energy of the seismic reflection phase axes of the target granite weathering crust reservoir: low-frequency continuous strong amplitude facies, medium-frequency low-continuous medium amplitude facies, and weak amplitude-blank facies; and analyze the planar distribution characteristics of the seismic facies of the target granite weathering crust reservoir by combining planar and cross-sectional methods.

[0105] In some embodiments of this specification, the extraction module may be specifically used to: extract the attribute features of the top of the target granite weathered crust reservoir using a first time window to obtain the distribution features of the reservoir at the top of the weathered crust; determine a second time window based on the seismic reflection features of the target granite weathered crust reservoir; extract the seismic attribute features of the middle part of the target granite weathered crust reservoir using the second time window to obtain the distribution features of the reservoir below the top of the weathered crust; and determine the seismic sensitivity attribute distribution features of the target granite weathered crust reservoir based on the distribution features of the reservoir at the top of the weathered crust and the distribution features of the reservoir below the top of the weathered crust.

[0106] In some embodiments of this specification, the establishment module can be specifically used to: divide the longitudinal structure of the target granite weathering crust reservoir into residual layer, dissolution layer and disintegration layer based on the comprehensive response characteristics of the sonic transit time logging curve, the deep and shallow dual lateral logging curve, the compensated neutron logging curve and the well core characteristics on a single well.

[0107] In some embodiments of this specification, the establishment module can be specifically used to: calibrate the types of longitudinal structures of the divided weathering crust with seismic facies types: medium-frequency low-continuous medium-amplitude corresponds to dissolution layers, low-frequency continuous high-amplitude corresponds to residual layers, and weak-amplitude-blank corresponds to disintegration layers, establishing a correspondence between weathering crust structures and seismic facies; based on the reservoir space combination type, porosity and permeability characteristics, oil content, and preservation conditions of the target granite weathering crust reservoir, classify the types of effective granite weathering crust reservoirs: medium-frequency low-continuous medium-amplitude corresponds to dissolution layers, which are Class I effective reservoirs; low-frequency continuous high-amplitude corresponds to residual layers, which are Class II effective reservoirs; and weak-amplitude-blank corresponds to disintegration layers, which are Class III effective reservoirs.

[0108] In some embodiments of this specification, the determining module may be specifically used to: for areas with exploratory wells, determine the effective reservoir distribution characteristics of the target granite weathered crust reservoir based on the weathered crust profile characteristics of the wells; for areas without exploratory wells, determine the effective reservoir distribution characteristics of the target granite weathered crust reservoir based on the correspondence between the seismic sensitivity attribute distribution characteristics and the seismic facies type and the vertical structure, combined with the seismic facies distribution characteristics and the seismic sensitivity attribute characteristics.

[0109] In some embodiments of this specification, the device further includes an exploration direction determination module, which can be used to determine the target reservoir exploration direction of the target granite weathered crust reservoir based on the effective reservoir distribution characteristics, oil-bearing data and hydrocarbon accumulation conditions of the target granite weathered crust reservoir.

[0110] As can be seen from the above description, the embodiments of this specification achieve the following technical effects: By analyzing the typical seismic facies types and distribution characteristics of granite weathering crust reservoirs, the distribution characteristics of seismic sensitivity attributes of different structural layers at the top and below the granite weathering crust reservoirs are studied. The response relationship between granite seismic facies and weathering crust structure is analyzed using the well-seismic calibration method, clarifying the geological genesis of the seismic facies, classifying the effective reservoir types of granite weathering crust, and comprehensively determining the effective reservoir distribution characteristics based on the distribution of seismic facies and the distribution characteristics of seismic sensitivity attributes, combined with the well-connected profiles of the weathering crust reservoir, the favorable reservoir exploration direction is finally indicated based on the oil-bearing characteristics of different seismic facies and the hydrocarbon accumulation conditions of the weathering crust reservoir. Adopting a research approach combining geology and seismology, with seismic prediction methods as the mainstay and closely integrated with geological interpretation, the response relationship between granite seismic facies types and weathering crust structure is clarified. The type of effective reservoir in granite weathering crust can be characterized based on seismic reflection characteristics, providing a clear direction for favorable reservoir exploration and effectively solving the problem of predicting the distribution of granite weathering crust reservoirs.

[0111] This specification also provides a computer device, which can be found in the following description. Figure 6 The diagram shown illustrates the computer device structure for a method of determining the effective reservoir distribution of granite weathering crust provided in the embodiments of this specification. Specifically, the computer device may include an input device 61, a processor 62, and a memory 63. The memory 63 stores processor-executable instructions. When the processor 62 executes the instructions, it implements the steps of the method for determining the effective reservoir distribution of granite weathering crust described in any of the above embodiments.

[0112] In this embodiment, the input device can specifically be one of the main devices for information exchange between the user and the computer system. The input device may include a keyboard, mouse, camera, scanner, light pen, handwriting input tablet, voice input device, etc.; the input device is used to input raw data and programs for processing these data into the computer. The input device can also receive data transmitted from other modules, units, and devices. The processor can be implemented in any suitable manner. For example, the processor can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers, etc. The memory can specifically be a memory device used to store information in modern information technology. The memory can include multiple layers; in digital systems, anything that can store binary data can be considered memory; in integrated circuits, a circuit without physical form but with storage function is also called memory, such as RAM, FIFO, etc.; in a system, a storage device with physical form is also called memory, such as a memory stick, TF card, etc.

[0113] In this embodiment, the specific functions and effects implemented by the computer device can be explained in comparison with other embodiments, and will not be repeated here.

[0114] This specification also provides a computer storage medium based on a method for determining the effective reservoir distribution of granite weathering crust in its embodiments. The computer storage medium stores computer program instructions that, when executed, implement the steps of the method for determining the effective reservoir distribution of granite weathering crust described in any of the above embodiments.

[0115] In this embodiment, the storage medium includes, but is not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), cache, hard disk drive (HDD), or memory card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured according to standards specified in the communication protocol for network connection communication.

[0116] In this embodiment, the specific functions and effects implemented by the program instructions stored in the computer storage medium can be explained by comparison with other embodiments, and will not be repeated here.

[0117] Obviously, those skilled in the art will understand that the modules or steps of the embodiments described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the embodiments of this specification are not limited to any particular combination of hardware and software.

[0118] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this specification should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents.

[0119] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to the embodiments described herein by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A method for determining the effective reservoir distribution in the weathered crust of granite, characterized in that, include: Based on the three-dimensional seismic data of the target granite weathered crust reservoir, the seismic facies type and seismic facies distribution characteristics of the target granite weathered crust reservoir are analyzed. The reservoir attribute characteristics of the target granite weathering crust reservoir are extracted along the layer using the maximum amplitude attribute, and the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir are obtained. Using well logging data of the target granite weathered crust reservoir, the vertical structure of the target granite weathered crust reservoir is delineated; the vertical structure of the target granite weathered crust reservoir is calibrated with the seismic facies type of the target granite weathered crust reservoir, and the correspondence between the seismic facies type and the vertical structure is established; Based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the longitudinal structure, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined.

2. The method for determining the effective reservoir distribution of granite weathering crust according to claim 1, characterized in that, Based on the 3D seismic data of the target granite weathering crust reservoir, the seismic facies types and distribution characteristics of the target granite weathering crust reservoir are analyzed, including: Based on the frequency, shape, continuity, and amplitude energy of the seismic reflection phase axes of the target granite weathering crust reservoir, the seismic facies types of the target granite weathering crust reservoir are divided into three types: low-frequency continuous strong amplitude facies, medium-frequency low-continuous medium amplitude facies, and weak amplitude-blank facies. The seismic facies plane distribution characteristics of the target granite weathering crust reservoir were analyzed by combining planar and cross-sectional methods.

3. The method for determining the effective reservoir distribution of granite weathering crust according to claim 1, characterized in that, The reservoir attribute characteristics of the target granite weathering crust reservoir are extracted along the layers using the maximum amplitude attribute, resulting in the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir, including: The attribute features of the top of the target granite weathering crust reservoir are extracted using the first time window to obtain the distribution features of the reservoir at the top of the weathering crust. Based on the seismic reflection characteristics of the target granite weathered crust reservoir, a second time window is determined; the seismic attribute characteristics of the middle part of the target granite weathered crust reservoir are extracted using the second time window to obtain the distribution characteristics of the reservoir below the top of the weathered crust. Based on the distribution characteristics of the reservoir at the top of the weathering crust and the distribution characteristics of the reservoir below the top of the weathering crust, the distribution characteristics of the seismic sensitivity attributes of the target granite weathering crust reservoir are determined.

4. The method for determining the effective reservoir distribution of granite weathering crust according to claim 2, characterized in that, Using well logging data from the target granite weathering crust reservoir, the vertical structure of the target granite weathering crust reservoir is delineated, including: Based on the comprehensive response characteristics of sonic transit time logging curves, deep and shallow dual lateral logging curves, compensated neutron logging curves, and well core characteristics, the vertical structure of the target granite weathering crust reservoir is divided into residual layer, dissolution layer, and disintegration layer.

5. The method for determining the effective reservoir distribution of granite weathering crust according to claim 4, characterized in that, The vertical structure of the target granite weathered crust reservoir is calibrated with the seismic facies type of the target granite weathered crust reservoir, and a correspondence between the seismic facies type and the vertical structure is established, including: The types of longitudinal structures of the weathering crust are labeled with the types of seismic facies: medium frequency low continuous medium amplitude corresponds to the dissolution layer, low frequency continuous strong amplitude corresponds to the residual layer, and weak amplitude-blank corresponds to the disintegration layer, thus establishing the correspondence between the weathering crust structure and the seismic facies. Based on the reservoir space combination type, porosity and permeability characteristics, oil content and preservation conditions of the target granite weathering crust reservoir, the effective reservoir types of granite weathering crust are classified as follows: medium-frequency low continuous medium amplitude corresponding to dissolution layer, which is a type I effective reservoir; low-frequency continuous strong amplitude corresponding to residual layer, which is a type II effective reservoir; weak amplitude - blank corresponding to disintegration layer, which is a type III effective reservoir.

6. The method for determining the effective reservoir distribution of granite weathering crust according to claim 1, characterized in that, Based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined, including: For areas with exploratory wells, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined based on the weathering crust profile characteristics of the wells. For areas without exploratory wells, based on the distribution characteristics of seismic sensitive attributes and the correspondence between the seismic facies type and the vertical structure, and in combination with the distribution characteristics of seismic facies and the seismic sensitive attributes, the effective reservoir distribution characteristics of the target granite weathering crust reservoir are determined.

7. The method for determining the effective reservoir distribution of granite weathering crust according to claim 1, characterized in that, After determining the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure, the method further includes: Based on the effective reservoir distribution characteristics, oil-bearing data, and hydrocarbon accumulation conditions of the target granite weathering crust reservoir, the target reservoir exploration direction of the target granite weathering crust reservoir is determined.

8. A device for determining the effective reservoir distribution of granite weathering crust, characterized in that, include: The analysis module is used to analyze the seismic facies type and seismic facies distribution characteristics of the target granite weathering crust reservoir based on the three-dimensional seismic data of the target granite weathering crust reservoir; The extraction module is used to extract the reservoir attribute features of the target granite weathering crust reservoir along the layer using the maximum amplitude attribute, and obtain the seismic sensitivity attribute distribution features of the target granite weathering crust reservoir; A module is established to delineate the vertical structure of the target granite weathered crust reservoir using well logging data; it is also used to calibrate the vertical structure of the target granite weathered crust reservoir with the seismic facies type of the target granite weathered crust reservoir, and establish the correspondence between the seismic facies type and the vertical structure. The determination module is used to determine the effective reservoir distribution characteristics of the target granite weathering crust reservoir based on the seismic facies distribution characteristics, the seismic sensitivity attribute distribution characteristics, and the correspondence between the seismic facies type and the vertical structure.

9. A computer device, characterized in that, It includes a processor and a memory for storing processor-executable instructions, wherein the processor, when executing the instructions, implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the instructions are executed by the processor, they implement the steps of the method according to any one of claims 1 to 7.

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