Sand body configuration depicting method based on earthquake wave trough and wave crest amplitude characteristics

Abstract

The invention discloses a sand body configuration depicting method based on earthquake wave trough and wave crest amplitude characteristics, which comprises the following steps: firstly, dividing seven different levels of configuration interfaces based on the existing research results of sedimentary microfacies; 8 types of configuration unit combinations are divided according to a single configuration unit and a vertical combination sequence, and the configuration unit combinations are divided into three major types based on the sand-to-ground ratio, the dentation degree of a GR curve and physical property characteristics; then, wave trough and wave crest seismic attribute characteristic parameters are optimized to analyze seismic response differences of three types of configuration unit combinations, seismic response modes of different configurations are constructed, wave trough and wave crest ratio plane distribution characteristics are determined, and the seismic root-mean-square amplitude and the wave trough and wave crest ratio are synthesized to obtain the seismic response mode of the three types of configuration units. Establishing an earthquake identification standard of the combination of the three types of configuration units; and finally, plane distribution prediction of the sand body configuration is completed based on geological-seismic response characteristics. According to the method, geological-seismic response identification standards of different configurations are constructed, and quantitative prediction of the sand body configuration is carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a sand body configuration characterization method based on seismic trough and wave peak amplitude characteristics. Background Art

[0002] As an unconventional gas reservoir, tight sandstone gas has huge resource prospects worldwide. The total reserves and annual production of tight sandstone gas fields in China account for about 1 / 3 and 1 / 4 of China's total natural gas reserves and annual production, respectively, and have become the most important and realistic source of conventional oil and gas resources in the next 10 to 20 years.

[0003] At present, a lot of research work has been carried out on sand body architecture, but the research is basically carried out using traditional architecture research ideas, mainly based on sedimentary microfacies, dividing single sand body architecture units of different levels, and analyzing the scale, morphology, direction and superposition relationship of architecture units. With the continuous advancement of tight gas reservoir exploration and development, the scale of tight sandstone gas enrichment and high-yield areas in the study area is limited, and the production and reserves of single wells in the same set of river sand bodies vary greatly. The sand body architecture distribution prediction research is mainly based on geological response characteristics from a qualitative-semi-quantitative perspective, and has not yet been combined with seismic response characteristics to carry out quantitative characterization of sand body architecture, which has failed to provide a good guide for well deployment in the later exploration and development process.

[0004] The existing patent CN201910793343.0 discloses a method for quantitative analysis of sand body configuration, which mainly identifies the cyclic interface of the study area, determines the sand body configuration interface according to the cyclic interface; analyzes the sand body configuration interface to obtain the single well sand body configuration elements and contact relationships; combines the single well sand body configuration elements and contact relationships to obtain the longitudinal sand body splicing relationship; predicts the transverse sand body splicing relationship according to the longitudinal sand body splicing relationship; obtains the sand body plane distribution map according to the longitudinal sand body splicing relationship and the transverse sand body splicing relationship; and uses the Monte Carlo simulation numerical simulation method according to the sand body plane distribution map to achieve a fine characterization of the sand body morphology and scale. However, the existing patent uses the traditional configuration research ideas to carry out related research, mainly based on sedimentary microfacies, divides the single sand body configuration units of different levels, analyzes the scale, morphology, direction and superposition relationship of the configuration units, and has not yet combined the seismic response characteristics to characterize the morphology and scale of the sand body. Summary of the invention

[0005] The main purpose of the present invention is to solve the problem that the prior art does not describe the shape and scale of the sand body in combination with the seismic response characteristics.

[0006] To achieve the above object, the present invention provides a sand body configuration characterization method based on seismic trough and peak amplitude characteristics, comprising: S1. Based on the existing research results of sedimentary microfacies, the study area is divided into 8 types of geological response characteristics of configuration unit combinations, and the three major types of configuration unit combinations in the study area are clarified; S2. Analyze the differences in seismic response of the three types of configuration unit combinations based on the characteristic parameters of trough and peak seismic attributes, and construct the seismic response patterns of the three types of configuration unit combinations; S3. Based on the analysis of seismic response characteristics and model construction, according to the magnitude of the seismic root mean square amplitude and the ratio of trough P2 / peak P3, the seismic response differences of the three types of configuration unit combinations are clarified, so as to determine the seismic response identification standards of the three types of configuration combination units; S4. The planar distribution prediction of sand body configuration is completed by analyzing the geological response characteristics of sand body configuration at a single well point and combining the seismic response identification criteria of the root mean square amplitude and trough / peak ratio of sand bodies with different configurations.

[0007] Furthermore, step S1 specifically includes: S11. Based on the traditional classification scheme of configuration interfaces, the seven-level configuration interfaces in the study area were identified; the internal structure of a single channel under the seven-level configuration interfaces was characterized, and based on the existing research and understanding of sedimentary microfacies, it was determined that the single sand bodies of the target sand group in the study area developed six types and five levels of single configuration units; S12. Based on the single configuration unit and its vertical combination sequence, 8 types of configuration unit combinations are defined; S13. Based on the range of geological geometric parameters of different configuration unit combinations, and according to the sand-to-ground ratio, the degree of toothing of the GR curve and physical properties, the eight types of configuration unit combinations are divided into three categories.

[0008] Furthermore, the seven-level configuration interfaces in step S11 are: lamination, micro-bottom, medium-sized bottom, accretion within large-sized bottom, large-sized bottom, single channel and composite channel.

[0009] Furthermore, the vertical combination sequence in step S12 is to identify the five-level single configuration units through sand body thickness, porosity, and sedimentary microfacies characteristics, and analyze the combination characteristics of the five-level single configuration units in the vertical direction, so as to clarify the vertical combination sequence.

[0010] Further, the 8 types of configuration unit combinations in step S12 are specifically: main channel sand + main channel sand, secondary channel sand + secondary channel sand, main channel sand + estuary dam sand, secondary channel sand + estuary dam sand, main channel sand + breach fan + natural levee, secondary channel sand + abandoned river channel + breach fan + natural levee, estuary dam sand + secondary channel sand + abandoned river channel, secondary channel sand + abandoned river channel.

[0011] Further, the specific implementation of step S13 is: SPSS was used to perform cluster analysis on the geological geometric parameters of different configuration unit combinations, and intersection plots were drawn two by two to obtain the range of geological geometric parameters of different configuration unit combinations. Based on the sand-to-ground ratio, GR curve toothing degree and physical property differences, the eight configuration unit combinations were further divided into three categories.

[0012] Furthermore, the three major types of configuration combination units are as follows: the sand-to-land ratio of type A configuration is between 0.34 and 0.63, the tooth rate is less than 12%, and the porosity is between 9% and 11%; the sand-to-land ratio of type B configuration is between 0.36 and 0.41, the tooth rate is between 12% and 15%, and the porosity is between 7% and 9%; the sand-to-land ratio of type C configuration is between 0.11 and 0.24, the tooth rate is greater than 15%, and the porosity is between 3% and 6%.

[0013] Furthermore, step S2 specifically includes: S21, using the trough-peak response parameters as the basis for identifying different sand body types; S22. Based on the seismic response parameters of trough P2 and peak P3, the seismic response mode of three types of configuration unit combinations is constructed.

[0014] Furthermore, the seismic response modes of the three types of configuration unit combinations in step S22 are specifically as follows: Type A is a wide trough with strong reflection, with waveform P2≥P3; Type B is a medium-weak trough and medium-weak peak reflection, with P2≤P3; Type C is a strong peak reflection, with P2 <P3。

[0015] Furthermore, the seismic response identification criteria of the three types of configuration combination units in step S3 are: Class A has a peak smaller than a trough, strong amplitude, and a trough / peak ratio between 1 and 2; Class B has a peak larger than a trough, medium amplitude, and a trough / peak ratio between 0 and 1; Class C has a peak larger than a trough, strong amplitude, and a trough / peak ratio between 0 and 1.

[0016] Beneficial effects: The present invention provides a set of sand body configuration characterization technology based on seismic trough and peak amplitude characteristics, which can evaluate sand body configuration more efficiently and accurately. Previous researchers mainly carried out sand body configuration distribution prediction research from a qualitative-semi-quantitative perspective based on geological response characteristics, but have not yet combined seismic response characteristics to carry out quantitative characterization of sand body configuration, and have not been able to provide a good guide for well site deployment in the later exploration and development process. This patent is mainly based on geological response characteristics, combined with seismic response characteristics such as seismic trough and peak amplitude, to construct geological-seismic response identification standards for different configurations, and carry out quantitative prediction of sand body configuration, which not only provides a theoretical basis for the prediction of sand body configuration, but also has important guiding significance for the next step of exploration and development of tight sandstone gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a flow chart of the sand body configuration characterization method provided by the present invention; Figure 2 It is a characteristic diagram of a five-level configuration unit provided by the present invention; Figure 3 It is the seismic response mode of different types of sand bodies provided by the present invention; Figure 4 It is a J3 seismic reflection single well profile provided by the present invention; Figure 5 It is a seismic reflection single well profile of well T1 provided by the present invention; Figure 6 It is a single well seismic profile of Well X1 provided by the present invention; Figure 7 It is the seismic response characteristics and pattern diagrams of different configurations provided by the present invention; Figure 8 It is a cross-plot of trough and peak amplitudes of different configurations provided by the present invention; Fig. 9 The present invention provides a trough / peak ratio stock price chart of different configurations; Fig.10 It is a plan distribution diagram of the trough / peak of the No. 1 sand group of the Shaximiao Formation in the TF gas field provided by the present invention; Fig.11 It is a plan distribution diagram of the trough / peak of the No. 2 sand group of the Shaximiao Formation in the TF gas field provided by the present invention; Fig.12 This is a plane distribution diagram of the sand body configuration of the No. 1 sand group of the Shaximiao Formation of the TF gas field provided by the present invention; Fig.13 This is a plane distribution diagram of the sand body configuration of the No. 2 sand group of the Shaximiao Formation in the TF gas field provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Embodiment 1: This study takes the channel sandstone of Shaximiao Formation in TF gas field as the research object, and uses the combination of well and seismic data to study the sand body configuration. Figure 1First, based on the existing research results of sedimentary microfacies, 7 different levels of configuration interfaces were divided; according to the vertical combination sequence of a single configuration unit, 8 types of configuration unit combinations were divided, and based on the sand-to-ground ratio, the degree of toothing of the GR curve and physical properties, the configuration unit combinations were divided into three categories; then, the trough and crest seismic attribute characteristic parameters were optimized to analyze the seismic response differences of the three types of configuration unit combinations, and the seismic response modes of different configurations were constructed. The planar distribution characteristics of the trough-to-peak ratio of the Shaximiao Formation in the TF gas field were clarified, and the seismic identification standards of the three types of configuration unit combinations were established based on the comprehensive seismic root mean square amplitude and the trough-to-peak ratio; finally, the planar distribution prediction of the sand body configuration was completed based on the geological-seismic response characteristics.

[0021] S1. Based on the geological response characteristics of eight types of configuration unit combinations, the study area is divided into three types of configuration unit combinations.

[0022] Based on the traditional classification scheme of configuration interface, it is clear that there are seven levels of configuration interfaces in the study area, namely, laminae, micro-bottom forms (ripple marks, internal accretion bodies of sand dunes), medium-sized bottom forms (sand dunes), internal accretion bodies of large-scale bottom forms (lateral accumulation bodies), large-scale bottom forms (point bars, breach scallops, natural levees), single channels and composite channels. This study mainly describes the internal structure of a single channel under the seven-level configuration interface. Based on the existing research and understanding of sedimentary microfacies, it is determined that the single sand bodies of the target sand group in the study area develop six types and five levels of single configuration units, namely, main channel sand, secondary channel sand, estuary bar sand, breach scallop sand, natural levee and abandoned channel. Among them, the logging curve of the main channel sand is a high-amplitude box type, the thickness of the single sand body is between 9.87m and 36.88m, the porosity (POR) is between 11% and 14%, and the permeability (PERM) is between 0.64×10 -3 μm 2 ~4.57×10 -3 μm 2 The logging curve of the secondary channel sand is a high-amplitude bell-shaped one, with a single sand body thickness ranging from 8.40m to 48.84m, a porosity ranging from 9% to 12%, and a permeability ranging from 0.42×10 -3 μm 2 ~2.00×10 -3 μm 2 The logging curve of the estuary bar sand is a medium-high amplitude funnel shape, the thickness of a single sand body is between 5.16m and 9.10m, the porosity is between 9% and 12%, and the permeability is between 0.03×10 -3 μm 2 ~1.10×10 -3 μm 2 The logging curve of the breach fan sand is a medium-width finger shape, the thickness of a single sand body is between 2.10m and 8.28m, the porosity is between 3% and 5%, and the permeability is between 0.018×10 -3μm 2 ~0.384×10 -3 μm 2 The natural levee logging curve is in the shape of medium-low amplitude finger, the thickness of single sand body is between 3.68m and 8.75m, the porosity is between 5% and 8%, and the permeability is between 0.001×10 -3 μm 2 ~0.231×10 -3 μm 2 The abandoned river channel logging curve is a low-amplitude sawtooth shape, the thickness of a single sand body is between 2.94m and 9.76m, the porosity is between 5% and 8%, and the permeability is between 0.023×10 -3 μm 2 ~0.382×10 -3 μm 2 ; and clarified the geological characteristics of different configuration units ( Figure 2 ).

[0023] Based on the single configuration unit and its vertical combination sequence, 8 types of configuration unit combinations were identified, including main channel sand + main channel sand, secondary channel sand + secondary channel sand, main channel sand + estuary bar sand, secondary channel sand + estuary bar sand, main channel sand + breach scallop + natural levee, secondary channel sand + abandoned channel + breach scallop + natural levee, estuary bar sand + secondary channel sand + abandoned channel, secondary channel sand + abandoned channel. The vertical combination sequence is mainly to identify the five-level configuration units of a single well through sand body thickness, porosity, sedimentary microfacies characteristics, etc., and analyze the combination characteristics of the five-level configuration units in the vertical direction of a single well, so as to clarify the vertical combination sequence.

[0024] SPSS was used to perform cluster analysis on the geological geometric parameters of different configuration unit combinations, and intersection diagrams were drawn pairwise to obtain the range of geological geometric parameters of different configuration unit combinations. According to the sand-to-formation ratio, GR curve toothing degree and physical property differences, the eight types of configuration unit combinations were further divided into three types of configuration combination units. Among them, the sand-to-formation ratio of type A configuration was between 0.34 and 0.63, the toothing rate was less than 12%, and the porosity was between 9% and 11%; the sand-to-formation ratio of type B configuration was between 0.36 and 0.41, the toothing rate was between 12% and 15%, and the porosity was between 7% and 9%; the sand-to-formation ratio of type C configuration was between 0.11 and 0.24, the toothing rate was greater than 15%, and the porosity was between 3% and 6%.

[0025] S2. Based on the characteristic parameters of trough and peak seismic attributes, the seismic response differences of the three major types of configuration unit combinations are analyzed to construct seismic response patterns of different configurations.

[0026] S21. Optimizing trough and peak response parameters as a basis for identifying different sand body types According to the difference of sand bodies and different lithologies distinguished on the seismic reflection profile, high-porosity thick sandstone presents negative reflection on the top surface, symmetrical waveform; mudstone intercalated with high-porosity sandstone presents positive reflection on the top surface, symmetrical waveform; the first mudstone intercalated with high-speed layer is h<λ / 4, with opposite polarity on the top and bottom surfaces, differential waveform, right-downward symmetrical waveform; mudstone intercalated with dense sandstone is a high-speed layer, with opposite polarity on the top and surface, differential waveform, left-downward symmetrical waveform; the transition layer is a transition type with a sudden change on the bottom surface and decreasing velocity upward, h<λ / 2, integral waveform; the thin interlayer is a transition type with a sudden change on the top surface and increasing velocity upward, h<λ / 2, integral waveform; where h is the thickness of the sand body and λ is the wavelength. This technology mainly studies the seismic reflection waveform of mudstone intercalated with high-speed sandstone and mudstone intercalated with high-speed layer. The determination method of seismic reflection waveform is: when the two-way travel time interval between two reflection interfaces is greater than a sub-wavelength, the reflection waves of the two interfaces have no interference and can be completely separated; when the two-way travel time interval is less than the sub-wavelength, interference will occur to form a composite wave. When the wavelength is greater than λ / 4, no superposition occurs. When the wavelength is less than λ / 4, the waveforms superpose. As the thickness decreases, the interference effect causes the top and bottom reflections to cancel each other out, and the amplitude gradually weakens.

[0027] The wave impedance structure is mainly established through the macroscopic layer division method. The macroscopic layer division refers to the layers or strata with roughly the same wave impedance, which play a major role in seismic recording. There are obvious differences in wave impedance between macroscopic layers, and the internal wave impedance difference can be relatively ignored. Among them, the high porosity and permeability in the thick mudstone is the bright spot seismic response of the sandstone. The overall velocity of the permeable sand layer is lower than that of the mudstone, which appears as a low-velocity layer. The top surface is negative reflection, the bottom surface is positive reflection, the crest and trough are obliquely symmetrical waveforms, and the sand layer group has a good correspondence with the trough-peak (the top of the sand layer corresponds to the trough, and the bottom corresponds to the crest). Several positive reflections are formed in the bell-shaped structure overlying the river sand body, and the side lobe troughs of its reflection will interfere and superimpose on the troughs on the top surface of the sand body, causing the troughs to be strengthened ( Figure 3 ,in Figure 3 The middle background color indicates mudstone).

[0028] Taking the single well of Shaximiao Formation in the study area as an example, the side lobe trough of the positive reflection interface of the overlying mudstone in Well J3 is superimposed on the top surface of the sandstone, which strengthens the top surface trough, and the side lobe trough of the positive reflection interface of the underlying mudstone is superimposed on the bottom surface, which weakens the bottom surface peak ( Figure 4 The velocity of the overlying mudstone and sandstone in Well T1 is similar, the overall reflection amplitude is weak, and the top and bottom reflection amplitudes are similar ( Figure 5 The negative reflection side lobe peaks on the X1 well are superimposed on the sandstone top surface reflection, which strengthens the sandstone top surface peaks, and the positive reflection peaks underneath are superimposed on the sandstone bottom surface reflection, which weakens the sandstone bottom surface troughs ( Figure 6 ).

[0029] S22. Construction of seismic response models of sand bodies with different configurations Based on the above analysis, trough (P2) and crest (P3) are selected as typical seismic response parameters for quantitative prediction of sand body architecture, and seismic response modes of three types of configuration unit combinations are constructed, among which Class A is wide trough with strong reflection, waveform P2≥P3; Class B is medium-weak trough and medium-weak crest reflection, P2≤P3; Class C is strong crest reflection, P2 <P3( Figure 7 ).

[0030] S3. Establishment of seismic response identification criteria for three types of configuration unit combinations Based on the above seismic response characteristics analysis and model construction, based on statistical analysis, the seismic response characteristics of three different configurations were clustered and analyzed. According to the magnitude of the seismic root mean square amplitude and the trough (P2) / peak (P3) ratio, the seismic response differences of the three types of configuration unit combinations were further clarified. Among them, the A-type peak is smaller than the trough, the amplitude is strong, and the trough / peak ratio is between 1 and 2; the B-type peak is larger than the trough, the amplitude is medium, and the trough / peak ratio is between 0 and 1; the C-type peak is larger than the trough, the amplitude is strong, and the trough / peak ratio is between 0 and 1 ( Figure 8-Figure 11 ).

[0031] S4. Complete the planar distribution prediction of sand body configuration based on geological-seismic response characteristics.

[0032] The sand body configuration distribution prediction of the Shaximiao Formation in the study area was completed by analyzing the geological response characteristics of the sand body configuration at a single well point and combining the seismic quantitative identification criteria such as the root mean square amplitude and trough / peak ratio of sand bodies with different configurations ( Fig.12 and Fig.13 ), the matching rate of well-seismic identification reached 94%.

[0033] Based on the above plane distribution prediction of sand body configuration, the prediction results of J1 well and J2 well in the study area were verified. The sand-to-formation ratio of J1 well was 0.52, the toothing rate of GR curve was 8%, the porosity was 10%, and the trough-to-peak ratio was 1.65; the sand-to-formation ratio of J2 well was 0.61, the toothing rate of GR curve was 3%, the porosity was 11%, and the trough-to-peak ratio was 1.72. It was verified that the sand body configuration types of the two wells were both Class A, and the sand body configuration prediction results were reliable. Prediction of the plane distribution of Wangcheng sand body configuration based on geological-seismic response characteristics

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand body configuration characterization method based on seismic trough and peak amplitude characteristics, characterized in that: include: S1. Based on the existing research results of sedimentary microfacies, the study area is divided into 8 types of geological response characteristics of configuration unit combinations, and the three major types of configuration unit combinations in the study area are clarified; S2. Analyze the differences in seismic response of the three types of configuration unit combinations based on the characteristic parameters of trough and peak seismic attributes, and construct the seismic response patterns of the three types of configuration unit combinations; S3. Based on the analysis of seismic response characteristics and model construction, according to the magnitude of the seismic root mean square amplitude and the ratio of trough P2 / peak P3, the seismic response differences of the three types of configuration unit combinations are clarified, so as to determine the seismic response identification standards of the three types of configuration combination units; S4. The planar distribution prediction of sand body configuration is completed by analyzing the geological response characteristics of sand body configuration at a single well point and combining the seismic response identification criteria of the root mean square amplitude and trough / peak ratio of sand bodies with different configurations.

2. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 1 is characterized in that: Step S1 specifically includes: S11. Based on the traditional classification scheme of configuration interfaces, the seven-level configuration interfaces in the study area were identified; the internal structure of a single channel under the seven-level configuration interfaces was characterized, and based on the existing research and understanding of sedimentary microfacies, it was determined that the single sand bodies of the target sand group in the study area developed six types and five levels of single configuration units; S12. Based on the single configuration unit and its vertical combination sequence, 8 types of configuration unit combinations are defined; S13. Based on the range of geological geometric parameters of different configuration unit combinations, and according to the sand-to-ground ratio, the degree of toothing of the GR curve and physical properties, the eight types of configuration unit combinations are divided into three categories.

3. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 2 is characterized in that: The seven levels of configuration interfaces in step S11 are: lamination, micro-bottom, medium-sized bottom, accretion within large-sized bottom, large-sized bottom, single channel and composite channel.

4. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 2 is characterized in that: The vertical combination sequence in step S12 is to identify the five-level single configuration units through sand body thickness, porosity, and sedimentary microfacies characteristics, and analyze the combination characteristics of the five-level single configuration units in the vertical direction, so as to clarify the vertical combination sequence.

5. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 2 is characterized in that: The eight types of configuration unit combinations in step S12 are specifically: main channel sand + main channel sand, secondary channel sand + secondary channel sand, main channel sand + estuary dam sand, secondary channel sand + estuary dam sand, main channel sand + breach scallop + natural levee, secondary channel sand + abandoned channel + breach scallop + natural levee, estuary dam sand + secondary channel sand + abandoned channel, secondary channel sand + abandoned channel.

6. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 2 is characterized in that: Step S13 specifically includes: SPSS was used to perform cluster analysis on the geological geometric parameters of different configuration unit combinations, and intersection diagrams were drawn two by two to obtain the range of geological geometric parameters of different configuration unit combinations. Based on the sand-to-ground ratio, GR curve toothing degree and physical property differences, the eight configuration unit combinations were divided into three categories.

7. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 6 is characterized in that: The three major types of configuration combination units are: the sand-to-land ratio of Type A configuration is between 0.34~0.63, the tooth rate is less than 12%, and the porosity is between 9%~11%; the sand-to-land ratio of Type B configuration is between 0.36~0.41, the tooth rate is between 12%~15%, and the porosity is between 7%~9%; the sand-to-land ratio of Type C configuration is between 0.11~0.24, the tooth rate is greater than 15%, and the porosity is between 3%~6%.

8. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 1 is characterized in that: Step S2 specifically includes: S21, using the trough-peak response parameters as the basis for identifying different sand body types; S22. Based on the seismic response parameters of trough P2 and peak P3, the seismic response mode of three types of configuration unit combinations is constructed.

9. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 8, characterized in that: The seismic response modes of the three types of configuration unit combinations in step S22 are specifically: Type A is a wide trough with strong reflection, waveform P2≥P3; Type B is a medium-weak trough and medium-weak peak reflection, P2≤P3; Type C is a strong peak reflection, P2 <P3。 10. The sand body configuration characterization method based on seismic trough and peak amplitude characteristics according to claim 1, characterized in that: The seismic response identification criteria of the three types of configuration combination units in step S3 are: Class A has a peak smaller than a trough, strong amplitude, and a trough / peak ratio between 1 and 2; Class B has a peak larger than a trough, medium amplitude, and a trough / peak ratio between 0 and 1; Class C has a peak larger than a trough, strong amplitude, and a trough / peak ratio between 0 and 1.

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