CN114594518A - Fine stratum contrast method for complex fault blocks in later development period based on well-seismic alternation - Google Patents
Fine stratum contrast method for complex fault blocks in later development period based on well-seismic alternation Download PDFInfo
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Abstract
The invention relates to a complex fault block fine stratum comparison method in the later stage of oil reservoir development, in particular to a complex fault block fine stratum comparison method in the later stage of development based on well-seismic alternation. It includes: establishing a preliminary construction model; carrying out primary comparison of the stratum by means of the area and the local marks; carrying out well seismic fine horizon calibration, carrying out whole-region horizon tracking, guiding the identification and description of low-order faults by using seismic attributes, and establishing a fine structural model; well-to-seismic combination is carried out, well-to-seismic alternative fine stratum comparison is carried out, and well-to-seismic contradiction is solved; performing whole-area fine closed interpretation and drawing a construction diagram; and drawing a small-layer plan, inspecting the stratum contrast data, and adjusting the layering or structure if the stratum contrast data has a problem, so as to solve the contradiction of oil-water development. The method solves the problems of difficult well contrast and serious well shock contradiction in complex fault block areas with high sand-to-ground ratio and no marker layer, divides the stratum more finely and accurately, and clarifies the distribution rule of the residual oil in the complex fault blocks.
Description
Technical Field
The invention relates to a complex fault block fine stratum comparison method in the later stage of oil reservoir development, in particular to a complex fault block fine stratum comparison method in the later stage of development based on well-seismic alternation.
Background
In the development of the complex fault block oil reservoir in the later stage, the potential difficulty of the residual oil is more and more difficult to dig, the requirement on the oil reservoir description is higher and higher, the fine and accurate stratum division needs to be carried out, and the enrichment rule of the residual oil of the complex fault block is clear. With the continuous deepening of oil and gas exploration and development in China, a plurality of advanced stratum contrast technologies are formed. The stratum contrast method of the isochronous stratum contrast framework is developed from a small-layer contrast technology of 'convolution contrast, hierarchical control and group basis' created in the early Daqing war and high-resolution sequence stratum contrast introduced in Deng-Honghui, to comprehensive interpretation by utilizing three-dimensional seismic data and well drilling data, comprehensive contrast by means of seismic inversion technology constraint and seismic horizon tracking interpretation and data such as conductivity curves and the like. Due to the development of a fracture system and the loss of a marker layer, when a conventional small layer comparison technology and a high-resolution sequence stratigraphy comprehensive analysis comparison technology are applied to a complex fault block, a logging curve has multiple resolutiveness and uncertainty, and the stratum is difficult to be accurately divided in an isochronous manner.
Chinese patent application CN106772679A discloses a method for formation comparison, which comprises: acquiring outcrop stratum layering reflecting stratum deposition of a research area, and determining field standard section layering of the research area according to the outcrop stratum layering; obtaining stratum layering of a specified well in the research area and stratum comparison results of the stratum layering of the specified well and the field standard profile layering; acquiring logging information in the research area, and acquiring stratum comparison results of the specified well and other wells in the research area according to the logging information; and layering according to the stratum comparison result of each well in the research area and the field standard profile to obtain a stratum comparison result in the research area.
The invention patent CN108008469B of China is a well-seismic combined horizontal well geosteering modeling method, which comprises the following steps: step 1, collecting adjacent well data and small-range three-dimensional seismic data in a work area; step 2, carrying out stratum comparison and dividing small layers according to the collected work area adjacent well data; step 3, establishing a three-dimensional digital geologic body of the work area by using a common kriging interpolation method according to the adjacent well hierarchical data; step 4, cutting a two-dimensional section from the three-dimensional geologic body along the well track; step 5, cutting a two-dimensional section along a well trajectory after processing the three-dimensional seismic data by utilizing the time-depth relation in the work area, and overlapping and displaying the two-dimensional section with a stratum model cut from the three-dimensional geologic body; and 6, adjusting the stratum model according to the form of the seismic section event so that the form of the stratum model is matched with the form of the seismic event.
The Chinese invention patent CN105064990B discloses a structural modeling method relying on horizontal well three-dimensional visual stratigraphic contrast, which comprises the following steps: importing data into three-dimensional visualization software, establishing a regional stratum longitudinal and transverse distribution mode, a small-layer straight well section logging identification mode, a small-layer inclined well section logging identification mode and a small-layer horizontal section logging identification mode, compiling to obtain a well track plane distribution diagram, further analyzing well track arrangement characteristics, cutting out a stratum section along a well track by using the three-dimensional visualization software, predicting the elevation of an upper-layer interface and a lower-layer interface of a horizontal section cross-layer point, constructing a layer model by using an elevation set consisting of layering points and predicting points of each small layer, establishing an elevation data set of each small-layer fine structure model, inputting the data set into the three-dimensional visualization software, and establishing the structure model.
In response to the problem of difficult mapping of complex fault formations, geologists have conducted many studies and developed advanced technologies. The technologies mainly comprise a well-seismic combination (combination and constraint) isochronous stratigraphic comparison technology based on seismic marker layer control, a full three-dimensional closed fine stratigraphic comparison technology of a well-seismic control bureau, a deposition control surface, a model control line and a dynamic control point, an isochronous comparison technology based on acoustic wave guided seismic constraint mode control, a well-seismic combination hierarchical control small-layer comparison technology based on a well-seismic constructed large-layer lattice frame, a phase control cycle and a seismic inversion technology to guide sand body comparison, geological comparison analysis under seismic profile guidance and the like. The well-to-seismic combination and the stratum contrast technology of a well-to-seismic control office are based on the contrast under the control of a seismic marker layer, and are suitable for complex fault areas with clear contrast marks; the geological contrast analysis under the guidance of the seismic profile is to guide geological faults by determining the number and the positions of breakpoints through the earthquake, but effective guidance is not given to the contrast of the horizons. In some complex fault blocks, oil reservoirs have serious stratum fracture loss, seismic marker layer fracture loss, high sand-ground ratio, few stratum comparison marks or unclear similarity, stratum comparison difficulty is very high, and sometimes contradictions exist in comparison between adjacent wells; the method for comprehensively comparing the seismic geology cannot realize fine stratigraphic comparison of complex areas.
Disclosure of Invention
The invention mainly aims to provide a method for comparing complex fault blocks in the later development period and fine strata based on well-seismic alternation, solves the problems that the well is difficult to compare in a complex fault block area with a high sand-ground ratio and without a marker layer and the well seismic contradiction is serious, divides the strata more finely and accurately and clarifies the distribution rule of residual oil in the complex fault blocks.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a well-seismic alternation-based method for comparing fine stratums of complex fault blocks in the later development stage, which comprises the following steps of:
step 1, calibrating well seismic position, and performing position tracking interpretation on a large layer and a marked sand group; finely describing the broken edge position of the large fault, and establishing a preliminary construction model;
step 2, performing stratum preliminary comparison by using a sequence stratigraphy method, combining the sedimentary characteristics and referring to the seismic sequence sedimentary characteristics and fault development conditions of the seismic section by means of regional and local marks;
step 3, well seismic fine horizon calibration is carried out, a small layer is calibrated, a whole-region horizon tracking is carried out on a main oil-containing small layer, the identification and description of a low-order fault are guided by using seismic attributes, and a fine structural model is established;
step 4, well-to-seismic combination is carried out, well-to-seismic alternative fine stratum comparison is carried out, and well-to-seismic contradiction is solved;
step 5, performing whole-area fine closed interpretation on each main force oil-containing small layer in the earthquake, and drawing a construction drawing;
and 6, drawing a small layer plan, checking stratum comparison data through small layer oil water and production dynamic data, if the stratum comparison data has problems, adjusting layering or structure, solving the contradiction of oil water development, and finishing alternate fine stratum comparison.
Further, the step 1 also comprises the steps of performing explanatory processing on the seismic data and clarifying the plane distribution rule of the fault through the seismic attributes.
Furthermore, fault enhancement processing is carried out on the seismic data to improve the fault resolution of the seismic section, and coherence attributes are extracted to clarify the plane distribution rule of the fault.
Further, in step 3, by analyzing the seismic reflection characteristics of each small layer, a plurality of small layers with uniform characteristics and stable and continuous energy are selected for full-area tracking interpretation, the hour window coherence attribute and the ant body attribute are extracted to guide fine interpretation of the low-order fault section, and a fine three-dimensional lattice structure is established.
Further, in step 4, when carrying out well-to-seismic alternating fine stratum contrast, if a contradiction exists between two wells in the same fault block, reading a depth matched with the seismic position of an adjacent well from the seismic profile, carrying out curve characteristic contrast on the well and the adjacent well, and if the well can be aligned upwards, adjusting the position according to the depth given by the earthquake; if the well pair is not up, searching a similar seismic co-directional axis again from the seismic profile, reading the depth, and continuously performing curve characteristic comparison with an adjacent well on the well until the well is matched with the seismic.
Further, in step 4, when well-to-seismic alternate fine stratum contrast is carried out, if an obvious fault exists in the earthquake but the stratum is not contrasted geologically, and the layer is not matched with an adjacent well, the depth of the fault on the well is read out in the earthquake, the fault drop is predicted, then a breakpoint and the fault drop are detected from the well according to the depth read in the earthquake, and the layer is integrally adjusted according to the position of the breakpoint.
Further, in step 4, when carrying out well-to-seismic alternating fine stratum comparison, if a plurality of stratums in a complex fault block area are broken and lost and no regional mark causes that geology cannot be compared, and contradictions exist between adjacent wells among different fault blocks, firstly reading the depth of a breakpoint and estimating fault drop in the earthquake; and simultaneously, reading out the depth which can be the same layer according to the seismic reflection characteristics of the same geological layer of the adjacent wells with different fault blocks in the earthquake, comparing the curve characteristics with the adjacent wells in the earthquake, adjusting the layers according to the characteristics when the curve characteristics are consistent, and re-finding the layer in the earthquake when the curve characteristics are not appropriate until the well earthquakes are matched.
Furthermore, if the alternating comparison between 2-3 times is not matched yet, the well deviation is considered.
Compared with the prior art, the invention has the following advantages:
the method breaks through the convention that geology is advanced and geology is assisted by a main earthquake in stratum comparison, utilizes an earthquake structure explanation initial model to guide geology comparison, and participates in stratum comparison in the whole process, particularly in a complex fault area with a missing well earthquake mark layer, establishes a fine small layer horizon and fault structure model through earthquake fault attribute guidance, and utilizes the determined breakpoint and the same-direction axis of similar earthquake reflection characteristics of the same stratum to indicate geologists to carry out fine stratum comparison, thereby ensuring accurate comparison of the complex area.
And compiling a small layer plan by referring to the fault boundary and the construction line state of the final construction diagram, and inspecting the comparison result of each oil-containing small layer through the oil-water relationship and the production dynamic condition to finally realize the fine stratum comparison of the complex fault blocks. The method solves the problems of difficult well contrast and serious well shock contradiction in complex fault block areas with high sand-to-ground ratio and no marker layer, divides the stratum more finely and accurately, and clarifies the distribution rule of the residual oil in the complex fault blocks. The method provides accurate geological foundation guidance for the development well pattern recombination in the description of the complex fault block oil reservoir, has a guidance effect on the later development of the oil reservoir, and has wide popularization and application prospect and remarkable economic and social benefits.
The method of the invention fully utilizes the three-dimensional seismic structure to explain horizon and fault framework to carry out well-seismic alternating type fine stratum comparison aiming at the problems of high sand-ground ratio, no marker layer, serious stratum fracture and loss and difficult stratum comparison in extremely complex fault blocks. By using the similar seismic reflection homodromous axis indication of the seismic interpretation breakpoint and the synchronous stratum, the fine stratum comparison of wells in a complex area and an area without a comparison mark is realized under the guidance of sequence stratigraphy and in combination with the characteristics of an uphole logging curve; and the accuracy of the structure and the comparison result is checked by utilizing the small-layer plan, and the fine stratigraphic comparison of extremely complex fault blocks from coarse to fine and from simple to complex is realized. The method has the advantages of simple flow, detailed steps, good guiding effect on the comparison of complex fault blocks and strata and strong practicability.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for fine stratigraphic comparison of complex fault blocks in the late stage of development based on well-to-seismic alternation according to an embodiment of the present invention;
FIG. 2 is a cross-sectional comparison of seismic sections before and after fault enhancement according to an embodiment of the invention: a is before treatment; b is after treatment;
FIG. 3 is a slice of a coherence volume of a target layer according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a zone stratigraphic comparison marker in accordance with an embodiment of the present invention;
fig. 5 is a cross section of single-well synthetic recording horizon calibration and well-tie horizon calibration according to an embodiment of the present invention: a is single-well synthetic recording horizon calibration; b is a well-connecting horizon calibration section;
FIG. 6 is a seismic structure interpretation section according to an embodiment of the invention;
fig. 7 shows a slice of the coherence of the time window and the attributes of ants according to an embodiment of the present invention: a is hour window coherence; b is the attribute slice of ant body;
FIG. 8 is a well tie profile illustration of the contradiction of geological stratification data between adjacent wells within the same fault block in accordance with an embodiment of the present invention;
FIG. 9 is a diagram of an alternate fine contrast mode of borehole-to-seismic events within different fault blocks in accordance with an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating an oil-water relationship-guided well-seismic alternating horizon adjustment according to an embodiment of the present invention;
FIG. 11 is a plan view of the main force sublayer according to an embodiment of the present invention: a is a 38 stained pottery museum building 442 small layer plan view; b is a 38 stained pottery museum building 461 small layer plan view.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
As shown in FIG. 1, the method for fine stratigraphic comparison of complex fault blocks in the later development stage based on well-to-seismic alternation comprises the following steps:
102, performing primary comparison on the stratum by using a sequence stratigraphy method, combining geological sedimentary characteristics, referring to seismic sequence sedimentary characteristics and fault development conditions of a seismic section and by means of regional and local marks, and entering 103.
103, adding the preliminary geological stratification data into a seismic base, finely calibrating small layers, selecting a main oil-bearing small layer for whole-area tracking interpretation, extracting seismic attributes to guide the identification and description of low-order faults, establishing a fine structure model, and entering 104.
1) if contradiction exists between two wells in the same fault block, the earthquake reads a depth matched with the earthquake horizon of an adjacent well from the section, then curve characteristics are compared with the adjacent well on the well, and if the well can be in opposite direction, the horizon is adjusted according to the depth given by the earthquake (the depth read by the earthquake and the contrast depth on the well are allowed to have an error of 10 meters); if the well pair is not up, searching similar seismic co-directional axes from the seismic profile again, reading the depth, and continuously performing curve characteristic comparison with adjacent wells on the well until the well seismic is matched.
2) If the layer is not matched with the adjacent well due to the fact that the obvious fault exists on the earthquake but the geological contrast does not exist, the depth of the fault on the well is read on the earthquake, the fault drop is predicted, then the break point and the fault drop are detected from the well according to the depth read by the earthquake (the magnitude of the contrast fault drop on the well is close to the prediction on the earthquake), and the layer is integrally adjusted according to the position of the break point.
3) If the geology cannot be compared due to the fact that most stratums in extremely complex fault block areas are broken and lost and no area marks exist, and contradictions exist between adjacent wells among different fault blocks, the depth of a breakpoint is read out and the fault drop is estimated firstly in an earthquake; simultaneously, according to the seismic reflection characteristics of the same geological layer of the adjacent wells with different fault blocks in the earthquake, the depth which is possibly the same layer is read out, curve characteristics are compared with the adjacent wells in the earthquake, if the curve characteristics are consistent, the layers are adjusted according to the characteristics, if the curve characteristics are not consistent, the layers are found again in the earthquake, until the well earthquakes are matched, the step is carried out to 105
And 105, after the whole-area fine stratum contrast is completed, performing whole-area fine closed interpretation on each main force oil-containing small layer in an earthquake, drawing a structural diagram, and entering 106.
And 106, drawing a small layer plane diagram according to the structural diagram, checking stratum contrast data through data of small layer oil and water, production dynamics and the like, adjusting layering or structure if the data have problems, solving the contradiction of oil and water development, and ending the process.
Example 2
Taking a 38-stained broken block located in the middle section of a southward broken zone of a Shao's oilfield, the broken block is a nasal structure pulled by a Liangtao group-Dongying group of a southward large fault descent disk, and a two-step broken block clamped by a south fault and a north fault has a wide east and a narrow west and a high and a low north strata. The interior of the fault block is cut into a plurality of oil-containing small fault blocks by a plurality of secondary faults, and the fault plays an important control role in oil, gas and water distribution. The ceramic group of the museum is deposited in a river phase, the sand-ground ratio is high, no stratum contrast mark exists, the layer break is serious, the stratum contrast is difficult, and the contrast between adjacent wells is contradictory. The problem that this piece exists at present is that fracture system is complicated, and geological foundation research is imperfect, lacks the research of whole system, and the development of oil reservoir has also entered into the bottleneck period of understanding remaining oil is unclear. The development of fine geological research, the implementation of structures and reservoirs and the clarification of the distribution rule of residual oil are urgently needed.
The method for comparing and analyzing the complex fault block fine strata in the later development stage based on the well-seismic alternation is adopted, and the steps are as follows:
(1) carrying out well seismic position calibration, and carrying out position tracking interpretation on the large layer and the marked sand group (Ngx5, Ngx6 and Ng _ b); the fault enhancement processing is carried out on the seismic data to improve the fault resolution of the seismic section, as shown in figure 2, the coherence attribute is extracted to clarify the plane distribution rule of the fault, as shown in figure 3, the broken edge position of the large fault is described in a fine mode, and a preliminary structure model is established.
(2) The method of sequence stratigraphy is applied, the sedimentary characteristics are combined, the seismic sequence sedimentary characteristics and fault development conditions of the seismic section are referred, and the preliminary comparison of the stratum is carried out by means of the regional and local marks, as shown in figure 4, the whole region is divided into 4 sand layer groups and 27 small layers, wherein the main force small layer is 10.
(3) And carrying out fine synthesis recording layer position calibration on each main force oil-containing small layer, and determining the seismic reflection characteristics of the main force small layer as shown in figure 5. By analyzing the seismic reflection characteristics of each small layer, 6 small layers (Ngs421, Ngs351, Ngs442, Ngs461, Ngx51 and Ngx61) with uniform characteristics and stable and continuous energy are selected for full-area tracking interpretation, as shown in fig. 6, and the small-time window coherence attributes and ant body attributes are extracted to guide the fine interpretation of the low-order fault section, as shown in fig. 7, and a fine structured three-dimensional grid is built.
(4) Well-to-seismic alternating fine stratigraphic comparison:
1) when a well-to-seismic conflict exists between adjacent wells of the same fault block, reading the depth of a very stable small layer from the earthquake, then comparing curve characteristics and sand bodies with a standard well (or an adjacent well) from the top of the well, and adjusting other layers according to the layer if appropriate; if the uphole contrast is not appropriate, the seismic horizon of the similar horizon to the adjacent well is searched again and the depth is read to give geological contrast (in some places, the same phases are different, which causes the logging curve characteristics of the same horizon on the well to be inconsistent), as shown in fig. 8.
2) When the horizon is not matched with an adjacent well due to the fact that an obvious fault exists in the earthquake but is not compared out geologically, the depth of the fault on the well is read out in the earthquake, fault drop is predicted, then the break point and the fault drop are compared out from the well according to the depth read in the earthquake (the magnitude of the drop of the comparison break point on the well is close to that of the fault predicted on the earthquake), and the horizon is adjusted integrally according to the fault.
3) Aiming at extremely complex fault block areas with stratum loss and no area comparison marks, when the well is difficult to compare or the well has contradictions between different fault blocks, firstly reading the position of a breakpoint from the earthquake and estimating the fault fall, and comparing the breakpoint and the fall by geological personnel with reference to the earthquake; secondly, reading the depth of a stable layer (a small layer or a sand body) according to the seismic reflection characteristics of the adjacent well layer in the earthquake, and carrying out logging curve comparison on the well by referring to the seismic depth in geology and combining the size of the fall of the breakpoint; if the well can be aligned up, the well is compared or adjusted according to the depth, and if the well can not be aligned up, the horizon is searched again on the earthquake according to the seismic reflection characteristics of the horizons of the adjacent wells, as shown in figure 9. If the well shakes are not matched after the alternating comparison for 2-3 times, the problem of well deviation is considered, the alternating comparison is not suitable for the well with the problem of well deviation, but the well with the problem of well deviation can be found through the method.
(4) And performing full-area closed interpretation and drawing a main force small layer construction diagram.
(5) Geologists draw a small layer plane graph according to the structure result graph, check the small layer data through the oil-water relation and the production dynamic condition, and if the small layer data are inconsistent, the adjacent condition is referred to, the layer position and the fault are readjusted, the oil-water contradiction is solved, and as shown in fig. 10, the whole-region fine stratum comparison is realized.
The technology of the invention adds a well-to-seismic alternating type fine stratum comparison method on the basis of conventional complex fault block stratum comparison. The method fully utilizes the three-dimensional space grid explained by the seismic structure, not only the horizon is compared from the ground, but also the horizon comparison is carried out by the seismic breakpoints and the similar seismic homodromous axial characteristics of the same horizon (sand body and small layer), so that the comparison result is more accurate and fine. The example block utilizes the comparison method in the invention to complete the stratum comparison and the hierarchical data adjustment of more than 50 wells in a complex area, 102 wells are compared in the whole area, and 120 well earthquakes of the compared 134 breakpoints are completely matched, thereby realizing the fine stratum comparison of the example block. The main force small layer plan shows that oil gas is distributed at the structural high part clamped by the fault, as shown in fig. 11, the distribution rule of the residual oil in the block is clarified, 8 potential well positions are provided, and a reliable geological foundation is provided for later-stage well pattern development adjustment and residual oil potential excavation.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. The well-seismic alternation-based method for comparing the fine strata of the complex fault blocks in the later development stage is characterized by comprising the following steps of:
step 1, calibrating well seismic position, and performing position tracking interpretation on a large layer and a marked sand group; finely describing the broken edge position of the large fault, and establishing a preliminary construction model;
step 2, performing stratum preliminary comparison by using a sequence stratigraphy method, combining the sedimentary characteristics and referring to the seismic sequence sedimentary characteristics and fault development conditions of the seismic section by means of regional and local marks;
step 3, well seismic fine horizon calibration is carried out, a small layer is calibrated, a whole-region horizon tracking is carried out on a main oil-containing small layer, the identification and description of a low-order fault are guided by using seismic attributes, and a fine structural model is established;
step 4, well-to-seismic combination is carried out, well-to-seismic alternative fine stratum comparison is carried out, and well-to-seismic contradiction is solved;
step 5, performing whole-area fine closed interpretation on each main force oil-containing small layer in the earthquake, and drawing a construction diagram;
and 6, drawing a small layer plan, checking stratum comparison data through small layer oil water and production dynamic data, if the stratum comparison data has problems, adjusting layering or structure, solving the contradiction of oil water development, and finishing alternate fine stratum comparison.
2. The method of claim 1, wherein step 1 further comprises performing interpretation processing on the seismic data and clarifying the plane spread law of the fault by seismic attributes.
3. The method of claim 2, wherein the fault enhancement processing is performed on the seismic data to improve the fault resolution of the seismic profile and the coherence properties are extracted to clarify the plane spread of the fault.
4. The method as claimed in claim 1, wherein in step 3, by analyzing the seismic reflection characteristics of each small layer, a plurality of small layers with uniform characteristics and stable and continuous energy are selected for full-area tracking interpretation, and hour window coherence attributes and ant body attributes are extracted to guide fine interpretation of low-order fault sections, so as to establish a fine three-dimensional lattice structure.
5. The method of claim 1, wherein in step 4, when performing well-to-seismic alternating fine stratigraphic comparison, if there is a conflict between two wells in the same fault block, reading a depth matching the seismic horizon of an adjacent well from the seismic profile, performing curve feature comparison on the well with the adjacent well, and if the well can be aligned, adjusting the horizon according to the depth given by the seismic; if the well pair is not up, searching a similar seismic co-directional axis again from the seismic profile, reading the depth, and continuously performing curve characteristic comparison with an adjacent well on the well until the well is matched with the seismic.
6. The method as claimed in claim 1, wherein in step 4, when the well-to-seismic alternating fine stratigraphic comparison is performed, if there is an obvious fault but there is no geological comparison in the earthquake, and the horizon is not matched with the adjacent well, the depth of the fault in the well is read out in the earthquake and the fault throw is predicted, and then the breakpoint and the fault throw are determined from the well according to the depth read in the earthquake, and the horizon is adjusted as a whole according to the position of the breakpoint and the fault throw.
7. The method as claimed in claim 1, wherein in step 4, when performing well-to-seismic alternating fine stratigraphic comparison, if a plurality of stratums in a complex fault block area are broken and lost, no zone mark causes no geological comparison, and contradictions exist between adjacent wells among different fault blocks, the depth of a breakpoint and the fault drop are firstly read out on the earthquake; and simultaneously, reading out the depth which can be the same layer according to the seismic reflection characteristics of the same geological layer of the adjacent wells with different fault blocks in the earthquake, comparing the curve characteristics with the adjacent wells in the earthquake, adjusting the layers according to the characteristics when the curve characteristics are consistent, and re-finding the layer in the earthquake when the curve characteristics are not appropriate until the well earthquakes are matched.
8. The method of claim 7, wherein if the alternating comparison between 2-3 times does not match the well-to-well, then a problem with the well deviation is considered.
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