CN111665561A - Multi-phase superposed river channel tight sandstone reservoir dominant reservoir identification method and device - Google Patents
Multi-phase superposed river channel tight sandstone reservoir dominant reservoir identification method and device Download PDFInfo
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- CN111665561A CN111665561A CN202010490778.0A CN202010490778A CN111665561A CN 111665561 A CN111665561 A CN 111665561A CN 202010490778 A CN202010490778 A CN 202010490778A CN 111665561 A CN111665561 A CN 111665561A
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/61—Analysis by combining or comparing a seismic data set with other data
- G01V2210/616—Data from specific type of measurement
- G01V2210/6161—Seismic or acoustic, e.g. land or sea measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/61—Analysis by combining or comparing a seismic data set with other data
- G01V2210/616—Data from specific type of measurement
- G01V2210/6169—Data from specific type of measurement using well-logging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/62—Physical property of subsurface
- G01V2210/624—Reservoir parameters
Abstract
The invention relates to a method and a device for identifying a dominant reservoir of a multi-phase superposed riverway tight sandstone reservoir, which are used for identifying the sand body of each well according to a set parameter definition standard by acquiring well-drilled logging data and core data in a target area; setting different sand body thickness filtering standards to filter the electrical characteristics in the logging data, judging the coincidence rate of the sand bodies with the identified main river channel, and determining the optimal sand body thickness filtering standard; determining the plane spread of the main river channel sand body thickness of each small layer under the optimal sand body thickness filtering standard; and defining different sand body overlapping types, overlapping the plane spreading of the thickness of each small layer of main channel sand body in the longitudinal direction, delineating the areas of different overlapping types, and finally determining the spreading range of the dominant reservoir. The method can accurately identify the river channel main body sand in the oil reservoir of the target area, and further accurately identify the advantageous reservoir area with high superposition degree and large superposition thickness in the river channel main body.
Description
Technical Field
The invention belongs to the field of petroleum exploitation geology, and particularly relates to a method and a device for identifying a dominant reservoir of a multi-phase superposed riverway tight sandstone reservoir.
Background
In a tight sandstone oil reservoir distributed in a large area, the separation is relatively homogeneous, the physical property is good, the logging oil content level is high, the oil yield after fracturing production is high, the reservoir is generally called as a dominant reservoir, and how to identify the reservoir is the premise of economically and effectively utilizing the tight sandstone resource quantity. At present, in various compact sandstone reservoirs, river sand is proved to be one of the most main reservoirs of oil and gas, particularly, underwater diversion river sand existing in a delta sedimentary system is easy to form a good combination of a raw storage cover and a main storage facies zone of the oil and gas due to wide development background, good sediment separation, low impurity base content, good physical property and large scale, and a hydrocarbon source rock close to the center of a lake basin.
The underwater diversion river channel sand bodies are generally formed by overlapping multi-phase single-cause sand bodies, the quality of different-scale river channel sand body reservoirs in different phases is greatly different, and for the sandstone reservoirs with the same thickness, after the oil layer fracturing of the underwater diversion river channel main body in the microphase type, the oil yield of an oil well in the initial stage is high, the yield is slowly decreased in the production process, and the accumulated yield of the oil well is high; and after the micro-phase type is produced by fracturing an oil layer on the side edge of the underwater diversion river channel, the oil yield of the oil well at the initial stage is low, even no oil is produced, the yield is rapidly decreased in the production process, and the cumulative yield of the oil well is low. Therefore, effective and accurate identification of the dominant reservoir of the river body is particularly important.
The existing analysis means of the dominant reservoir of the multi-phase superposed channel-shaped tight sandstone reservoir generally only stays at the qualitative analysis and description stage of the plane distribution characteristics of the channel microfacies, and further, the mature technologies for quantitatively depicting the channel main body and the channel side edge sand body in the channel microfacies are relatively few, so that the channel main body area cannot be accurately identified, the accurate identification of the dominant reservoir is influenced, and the formulation of petroleum development strategies is influenced.
Disclosure of Invention
The invention aims to provide a method and a device for identifying a dominant reservoir of a multi-phase superposed channel tight sandstone reservoir, which are used for solving the problem that the accurate identification of the dominant reservoir is influenced due to the inaccurate identification of a main body region of a channel at present.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for identifying a dominant reservoir of a multi-phase superposed riverway tight sandstone reservoir comprises the following steps:
1) acquiring well logging data and core data of a drilled well in a target area, and performing main river sand body identification on sand bodies of wells according to a set parameter definition standard;
2) setting different sand body thickness filtering standards to filter the sandstone explained in the logging data, and obtaining sand body explanations under the different sand body thickness filtering standards;
3) determining an optimal sand body thickness filtering standard by counting the coincidence rate of sand bodies explained under different sand body thickness filtering standards and the main river channel sand body identified in the step 1);
4) carrying out longitudinal small-layer equal-time subdivision comparison on the target area, and determining the plane spread of the main river sand body thickness of each small layer under the optimal sand body thickness filtering standard;
5) and (4) respectively superposing the plane spread of the thickness of the sand body of each small layer of the main river channel in the longitudinal direction, and determining the spread range of the dominant reservoir according to superposition types.
The invention has the beneficial effects that: the invention defines standard and drilled core data of target area according to set parameters, identifies main channel sand body and channel side margin in channel sand body, filters sandstone explained in logging data by combining with set different sand body thickness filtering standard, compares the coincidence rate of sand body explanation under different sand body thickness filtering standard and main channel sand body identified, determines optimal sand body thickness filtering standard, can filter channel side margin sand body and part burr sand body with low production capacity and thin thickness according to optimal sand body thickness filtering standard, retains main channel sand body, accurately identifies dominant reservoir area of channel main body with high reservoir superposition degree and large superposition thickness in target area by defining superposition type of channel sand body, provides basis for reservoir classification development strategy formulation of different types of oil exploitation, thereby realizing differential classification development of reservoir, the oil reservoir recovery efficiency is improved to the maximum extent.
Further, the parameters of the parameter definition standard set in the step 1) include core description, electrical characteristics, lithology, sand thickness and block bedding thickness.
Further, the filtering standards of different sand body thicknesses in the step 2) are respectively 2m, 4m, 6m and 8 m.
Further, when the coincidence rate in the step 3) meets the set requirement, the corresponding sand body thickness filtering standard is used as the optimal sand body thickness filtering standard.
Further, the superposition type in the step 5) comprises I-type superposition, II-type superposition and III-type superposition, wherein the I-type superposition is superposition of main river sand bodies and is a dominant reservoir; the type II superposition comprises superposition of a main river channel sand body and a river channel side edge, and is a medium reservoir; and the III type superposition is superposition of river channel side edge sand bodies and is a poor reservoir.
The invention also provides a device for identifying the dominant reservoir of the multi-phase superposed riverway tight sandstone reservoir, which comprises a processor and a memory, wherein the processor is used for executing the following instructions stored in the memory:
1) acquiring well logging data and core data of a drilled well in a target area, and performing main river sand body identification on sand bodies of wells according to a set parameter definition standard;
2) setting different sand body thickness filtering standards to filter the sandstone explained in the logging data, and obtaining sand body explanations under the different sand body thickness filtering standards;
3) determining an optimal sand body thickness filtering standard by counting the coincidence rate of sand bodies explained under different sand body thickness filtering standards and the main river channel sand body identified in the step 1);
4) carrying out longitudinal small-layer equal-time subdivision comparison on the target area, and determining the plane spread of the main river sand body thickness of each small layer under the optimal sand body thickness filtering standard;
5) and (4) respectively superposing the plane spread of the thickness of the sand body of each small layer of the main river channel in the longitudinal direction, and determining the spread range of the dominant reservoir according to superposition types.
Further, the parameters of the set parameter definition standard comprise core description, electrical characteristics, lithology, sand thickness and block bedding thickness.
Furthermore, the filtering standards of the different sand body thicknesses are respectively 2m, 4m, 6m and 8 m.
And further, when the coincidence rate meets the set requirement, the corresponding sand body thickness filtering standard is used as the optimal sand body thickness filtering standard.
Further, the superposition type comprises I-type superposition, II-type superposition and III-type superposition, wherein the I-type superposition is superposition of main river sand bodies and is a dominant reservoir; the type II superposition comprises superposition of a main river channel sand body and a river channel side edge, and is a medium reservoir; and the III type superposition is superposition of river channel side edge sand bodies and is a poor reservoir.
Drawings
FIG. 1 is a single well facies diagram of a certain cored well acquired in the present example;
FIG. 2 shows the channel body and channel side edge setting parameter defining criteria in the present embodiment;
FIG. 3-1 is a result of interpreting the sand body of the second sand body without the filtering criterion in this example;
3-2 are sand body secondary sand body interpretation results under the 2m sand body thickness filtration standard in this example;
FIGS. 3-3 are the results of the explanation of the sand secondary sand body under the 4m sand body thickness filtration standard in this example;
FIGS. 3-4 are the results of the explanation of the secondary sand body of the sand body under the 6m sand body thickness filtration standard in this example;
FIGS. 3 to 5 are the results of the explanation of the secondary sand body of the sand body under the filtration standard of the sand body thickness of 8m in the present example;
FIG. 4-1 is a cross-sectional view comparing layers of a partial well division within a target area in the present embodiment;
FIG. 4-2 is a schematic partial dimensional view of the comparative cross-sectional view of FIG. 4-1;
FIG. 5-1 shows length 3 in the present embodiment3 1The optimal sand body thickness of the small layer is a river channel sand body plane layout pattern under the filtering standard of 4 m;
FIG. 5-2 shows length 3 in the present embodiment3 2The optimal sand body thickness of the small layer is a river channel sand body plane layout pattern under the filtering standard of 4 m;
FIG. 6-1 shows length 3 in the present invention3 1The contour map of the thickness of the sand body of the river channel of the small layer under the filtering standard of the thickness of the sand body of 2 m;
FIG. 6-2 shows length 3 in the present invention3 1The contour map of the thickness of the sand body of the river channel of the small layer under the filtering standard of the thickness of the sand body of 4 m;
FIGS. 6-3 show length 3 of the present invention3 1The contour map of the thickness of the sand body of the river channel of the small layer under the sand body thickness filtering standard of 6 m;
FIGS. 6-4 show length 3 of the present invention3 1Filtering standard of small layer with 8m sand thicknessA lower riverway sand body thickness contour map;
FIGS. 6-5 show length 3 of the present invention3 2The contour map of the thickness of the sand body of the river channel of the small layer under the filtering standard of the thickness of the sand body of 2 m;
FIGS. 6-6 show length 3 of the present invention3 2The contour map of the thickness of the sand body of the river channel of the small layer under the filtering standard of the thickness of the sand body of 4 m;
FIGS. 6-7 show length 3 of the present invention3 2The contour map of the thickness of the sand body of the river channel of the small layer under the sand body thickness filtering standard of 6 m;
FIGS. 6-8 show length 3 of the present invention3 2The contour map of the thickness of the sand body of the river channel of the small layer under the filtering standard of the thickness of the sand body of 8 m;
FIG. 7-1 shows a sand body I-type superposition type of a river channel in the present embodiment;
fig. 7-2 shows a channel sand type ii stacking type in the present embodiment;
fig. 7-3 are channel sand type iii stacks in this embodiment;
FIG. 8 shows length 3 in the present embodiment3And1length 33 2A plain view of the river sand body of the small layer after superposition;
reference numerals: a-main channel sand body, b-channel side edge sand body and c-thin layer sand body.
Detailed Description
The invention will be further described with reference to specific embodiments and with reference to the accompanying drawings.
Embodiment of the identification method
The oil-bearing area of 3 layers of the extended group length of a certain oil field is 43.5km2Geological reserves 1479 × 104t, porosity 12.2%, permeability 0.76 × 10-3μm2The oil field is put into development from 2011 to the end of 3 months in 2017, 184 oil production wells are shared, and 99 water injection wells are arranged; and the oil field target block reservoir is formed by longitudinally superposing the front edge river sand bodies of the multi-stage braided river delta, the scales and superposition degrees of different small layers of sand bodies in the longitudinal direction are different, the difference between the thickness and the plane distribution of the sand bodies of the river channel in the same small layer is large, and different areas in the plane are formedThe oil well productivity difference is large.
By taking the oil field as an example, the identification method for the dominant reservoir of the multi-phase superposed riverway tight sandstone reservoir specifically comprises the following steps:
1. and acquiring well logging data and core data of the drilled wells in the target area, and performing main river sand body identification on sand bodies of all wells according to set parameter definition standards.
Firstly, well logging data and core data of a drilled well are obtained; establishing a single-well phase histogram of each coring well through core observation; and qualitatively describing characteristic parameters of the type, the period, the thickness, the sedimentary structure type, the logging curve form and the like of the river channel in the thick-layer sand body according to the single-well phase histogram of each coring well.
In this embodiment, a single-well phase column main map of a certain core well is shown in fig. 1.
In the embodiment, the period and the thickness of the river channel inside the thick-layer sand body are divided and measured according to the retention and deposition structure at the bottom of the single-period river channel; the sedimentary structure types comprise common fluvial facies sedimentary structures such as riverway bottom retention sedimentation, blocky bedding, parallel bedding, low-angle staggered bedding, water flow sand texture bedding, wave bedding, deformation bedding and the like, and the qualitative description mainly comprises the measurement of the thickness of the blocky bedding developing in the riverway and the description of the oil content.
Secondly, carrying out statistical analysis on the single well phase of each coring well, establishing a multi-well river channel sand body core characteristic parameter database for statistical analysis, determining a parameter defining standard for distinguishing the main river channel sand body from the river channel side edge sand body, carrying out main river channel sand body identification on the sand body of each well, and mainly distinguishing the main river channel sand body from the river channel side edge sand body in the aspects of well logging curve shape, blocky bedding sandstone thickness, core oil gas display level and the like.
The parameters of the main channel sand body identification defining standard comprise core description, electrical characteristics, lithology, sand body thickness and block bedding thickness.
Specifically, as shown in fig. 2, the definition standard of each parameter of the channel main body sand body is as follows: the reservoir layer is composed of rock phases such as fine sandstone and gravel-containing fine sandstone, the debris component mainly comprises quartz and secondarily comprises feldspar, the sorting property is good, the thickness of a sand body is more than 3m, the block bedding is developed, the thickness is more than 0.5m, the oil stain and oil-containing display level are achieved, the natural potential and natural gamma logging curve are box-shaped, and the amplitude difference of the microelectrode is large; the definition standards of all parameters of the riverway side edge sand body are as follows: mainly uses powder and fine sandstone as main materials, has high mud content, does not develop block bedding, has thinner thickness than a river channel main body, has sand body thickness of less than 3m, wherein the block bedding thickness of less than 0.5m is mostly fluorescence and oil stain display level, has natural potential and natural gamma which mainly take a bell shape, and secondly takes a box shape, and has smaller microelectrode amplitude difference than the river channel main body.
2. Setting different sand body thickness filtering standards to filter the sandstone explained in the logging data, and obtaining sand bodies explained under the different sand body thickness filtering standards;
in the embodiment, on the basis of dividing sand bodies by using a conventional logging gamma curve and a natural potential curve, the sand bodies are subjected to logging secondary interpretation by adopting different sand body thickness filtering standards. Specifically, the sand body interpretation in this embodiment is a filtering interpretation performed on the river channel main body and the river channel side edge sand body obtained in step 1 in combination with the electrical characteristics step by setting different sand body thickness filtering standards.
The filtration standards of different sand body thicknesses in the embodiment are 2m, 4m, 6m and 8 m.
3. Determining the optimal sand body thickness filtering standard according to the coincidence rate of the sand body interpretation results under different sand body thickness filtering standards and the main river channel sand body identified in the step 1).
As shown in fig. 3-1 through 3-5, the filtering criteria for the lengths 3311, 3312, 3313 and 3321 of the different formations are explained by way of example for the WB53 well.
Wherein, fig. 3-1 is the sand body explanation without the filtering standard, fig. 3-2 is the sand body explanation when the filtering standard of the sand body thickness is 2m, and from the explanation results in fig. 3-1 and fig. 3-2, when the filtering standard is not passed and the filtering standard of the sand body thickness is 2m, the sand body explained by the filtering standard is more burred and the sand body at the side edge of the river channel still develops; the standard filtering interpretation result with the sand thickness of 4m is utilized to filter out small sand bodies with low display grade and poor physical properties, and the remained sand bodies have good oil property, namely, are main oil outlet sections, as shown in fig. 3-3; as shown in fig. 3-4 and 3-5, the 6m, 8m standard interpreted sand thickness tends to be stable, but at the same time filters out the main river sand with higher oil display rating.
The coincidence rate in this embodiment is the coincidence rate of the interpreted sand bodies under the different sand body thickness filtering standards and the identified thickness and number of the river channel main body sand bodies, when the coincidence rate meets the set requirement, the corresponding sandstone thickness filtering standard is used as the optimal sand body thickness filtering standard for the main river channel interpretation, and meanwhile, the partially non-conforming interpretation is corrected by referring to the curve form.
The setting requirement in this embodiment is 90%; of course, the requirement for setting the matching rate in the present invention is different according to different regions, and is not uniquely determined, and the setting requirement range may be 80% to 100%.
The finally determined optimal sand body thickness filtering standard in the embodiment is 4m, most burr sand bodies can be filtered, and the stratum main river sand body is stored. And (3) taking the sand body thickness of 4m as a standard, and developing comprehensive explanation of the sand body of the main river course layer by combining curve forms of the sand body of the main river course well by well. Certainly, for river sand bodies in different areas, the sand body thickness filtering standard is different due to reservoir difference, and is determined according to actual conditions.
4. And carrying out longitudinal small-layer equal-time stratum subdivision comparison on the target area, and determining the plane spread of the main channel sand body thickness of each small layer under the optimal sand body thickness filtering standard.
Firstly, comprehensively considering geological data such as earthquake, logging and coring, and the like, and carrying out longitudinal small-layer isochronal subdivision comparison on an oil reservoir by using the similarity principle of a logging curve and taking the thickness of a stratum as constraint;
the isochronous stratigraphic comparison refers to stratigraphic comparison with isochronous seismic event or special lithology surface as constraint, and the subdivided stratums are formed by deposition in the same geological period.
As shown in fig. 4-1, the reservoir formation is subdivided into three sets of main layers using an isochronal stratigraphic comparison methodThe desired reservoirs, each length 33 1Length 33 2And length 33 3Small layer, as can be seen in the figure, of which length is 33 1And length 33 2The development of small layer of sand is the main oil-containing sand in this area, and it should be noted that the length 331 in FIG. 4-1 represents the length 33 1Small layer, Length 332 represents Length 33 2Small layer, length 333 represents length 33 3Small layer, fig. 4-2 is a specific dimension employed in fig. 4-1 using the isochronal contrast method.
Secondly, using the stratigraphic comparison results, length 3 is determined3 1And length 33 2And the small layer is subjected to plane spreading of the main river channel sand body thickness under the optimal sand body thickness filtering standard (4 m).
For more intuitive and clear qualitative description, the embodiment is explained in the form of graph, that is, length 3 is drawn according to the result of stratigraphic comparison3 1And length 33 2Sand thickness plane contour plot of small layers at 4m sand thickness filtration standard, resulting in length 3 in fig. 5-1 and 5-23 1And length 33 2The plane exhibition of main river course sand body thickness is figured out.
Of course, in order to further verify whether the optimal sand body thickness filtering standard in the step 3 is accurate, the length 3 can be drawn when the sand body thickness plane contour map is drawn3 1Contour plots for small layers at different sand thickness filtration standards (2m, 4m, 6m, 8m), as shown in FIGS. 6-1 through 6-4, for length 33 2Contour plots at different sand thickness filtration standards (2m, 4m, 6m, 8m) for small layers, as shown in FIGS. 6-5 through 6-8; and (3) further determining that the sand body plane graph drawn by the 4m thickness standard of each small layer is stable in main channel form and continuous in sand bodies among wells compared with other sand body thickness filtering standards by comparing the difference of sand body thickness contour graphs of different levels of the same small layer, and the sand body plane graph is consistent with the optimal sand body thickness filtering standard determined in the step (3).
5. And (4) respectively superposing the plane spread of the thickness of the sand body of each small layer of the main river channel in the longitudinal direction, and determining the spread range of the dominant reservoir according to superposition types.
The superposition type of the river channel sand body in the embodiment is defined as three types of sand body superposition modes, namely I type superposition, II type superposition and III type superposition as shown in FIG. 7-1, FIG. 7-2 and FIG. 7-3; the I-type superposition is the superposition of main river sand bodies a in two small layers, and is a dominant reservoir; the type II is overlapped into two small layers, wherein one layer is a main river channel sand body a, the other layer is a river channel side edge sand body b, and the middle reservoir layer is formed; the III-type superposition is the superposition of two layers of riverway side edge sand bodies b, and the single sand bodies are both thin-layer sand bodies c which are poor reservoirs.
For a more intuitive and clear qualitative description, the embodiment is illustrated in a graphic form, and the length is 33 1And length 33 2And superposing the two small-layer main river sand body plane distribution maps, dividing segment ranges of sand bodies of different superposition types on a plane by taking the three superposition types as standards, finally obtaining a sand body plane map, and determining a dominant reservoir layer spreading area.
FIG. 8 is a plan view of river sand of different stacking types, wherein the I-type area is a dominant reservoir area, WB47 well areas of dominant reservoir development in the I-type stacking range of the research area, new rolling wells 34 (oil wells 17 and water wells 17) are deployed, and drilling footage is 2.5 × 104m, new capacity 0.92 × 104t, mobilizing geological reserves 136 × 104t, the oil well produces more than 3t of oil every day in the initial stage after implementation, and a good effect is obtained, thus proving the effectiveness of the method.
The advantageous reservoir identification method can distinguish the underwater diversion river channel main body sand body in the block from the river channel sand body, can accurately identify the advantageous reservoir of the river channel main body by depicting the plane and the longitudinal spreading shape of the underwater diversion river channel main body, and provides a basis for subsequent oil exploitation.
Identification device embodiment
The invention also provides a device for identifying the advantageous reservoir of the multi-phase superposed tight sandstone reservoir of the river channel, which is actually equipment with data processing capability such as a computer, and the equipment comprises a processor and a memory, wherein the processor is used for executing instructions to realize the method for identifying the advantageous reservoir of the multi-phase superposed tight sandstone reservoir of the river channel.
Claims (10)
1. A method for identifying a dominant reservoir of a multi-phase superposed riverway tight sandstone reservoir is characterized by comprising the following steps:
1) acquiring well logging data and core data of a drilled well in a target area, and performing main river sand body identification on sand bodies of wells according to a set parameter definition standard;
2) setting different sand body thickness filtering standards to filter the sandstone explained in the logging data, and obtaining sand bodies explained under the different sand body thickness filtering standards;
3) determining an optimal sand body thickness filtering standard by counting the coincidence rate of sand bodies explained under different sand body thickness filtering standards and the main river channel sand body identified in the step 1);
4) carrying out longitudinal small-layer equal-time subdivision comparison on the target area, and determining the plane spread of the main river sand body thickness of each small layer under the optimal sand body thickness filtering standard;
5) and (4) respectively superposing the plane spread of the thickness of the sand body of each small layer of the main river channel in the longitudinal direction, and determining the spread range of the dominant reservoir according to superposition types.
2. The method for identifying the dominant reservoir of the multi-phase stacked riverway tight sandstone reservoir according to claim 1, wherein the parameters for setting the parameter definition standard in the step 1) comprise core description, electrical characteristics, lithology, sand thickness and block bedding thickness.
3. The method for identifying the dominant reservoir of the multi-phase stacked riverway tight sandstone reservoir according to claim 1, wherein the filtering standards of the different sand thicknesses in the step 2) are respectively 2m, 4m, 6m and 8 m.
4. The method for identifying the dominant reservoir of the multi-phase stacked riverway tight sandstone reservoir according to claim 1, wherein when the coincidence rate in the step 3) meets the set requirement, the corresponding sand body thickness filtering standard is used as the optimal sand body thickness filtering standard.
5. The method for identifying the dominant reservoir of the multi-phase superposed riverway tight sandstone reservoir according to claim 1, wherein the superposition types in the step 5) comprise I-type superposition, II-type superposition and III-type superposition, wherein the I-type superposition is the superposition of main riverway sand bodies and is the dominant reservoir; the type II superposition comprises superposition of a main river channel sand body and a river channel side edge, and is a medium reservoir; and the III type superposition is superposition of river channel side edge sand bodies and is a poor reservoir.
6. The device for identifying the dominant reservoir of the multi-phase stacked riverway tight sandstone reservoir is characterized by comprising a processor and a memory, wherein the processor is used for executing the following instructions stored in the memory:
1) acquiring well logging data and core data of a drilled well in a target area, and performing main river sand body identification on sand bodies of wells according to a set parameter definition standard;
2) setting different sand body thickness filtering standards to filter the sandstone explained in the logging data, and obtaining sand body explanations under the different sand body thickness filtering standards;
3) determining an optimal sand body thickness filtering standard according to the coincidence rate of the sand bodies explained under different sand body thickness filtering standards and the main river channel sand bodies identified in the step 1);
4) carrying out longitudinal small-layer equal-time subdivision comparison on the target area, and determining the plane spread of the main river sand body thickness of each small layer under the optimal sand body thickness filtering standard;
5) and (4) respectively superposing the plane spread of the thickness of the sand body of each small layer of the main river channel in the longitudinal direction, and determining the spread range of the dominant reservoir according to superposition types.
7. The device for identifying the dominant reservoir in the multi-phase stacked riverway tight sandstone reservoir according to claim 6, wherein the parameters of the set parameter defining criteria comprise core description, electrical characteristics, lithology, sand thickness and block bedding thickness.
8. The device for identifying the dominant reservoir in the multi-phase stacked riverway tight sandstone reservoir according to claim 6, wherein the different sand body thickness filtering standards are respectively 2m, 4m, 6m and 8 m.
9. The device for identifying the dominant reservoir of the multi-phase stacked riverway tight sandstone reservoir according to claim 6, wherein when the coincidence rate meets the set requirement, the corresponding sand body thickness filtering standard is used as the optimal sand body thickness filtering standard.
10. The device for identifying the dominant reservoir of the multi-phase superposed tight sandstone reservoir of the river channel according to claim 6, wherein the superposition types comprise I-type superposition, II-type superposition and III-type superposition, wherein the I-type superposition is the superposition of the main river channel sand body and is the dominant reservoir; the type II superposition comprises superposition of a main river channel sand body and a river channel side edge, and is a medium reservoir; and the III type superposition is superposition of river channel side edge sand bodies and is a poor reservoir.
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