CN116341925B - System, method, equipment and terminal for evaluating continuity of high-quality reservoir of compact sandstone - Google Patents
System, method, equipment and terminal for evaluating continuity of high-quality reservoir of compact sandstone Download PDFInfo
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Abstract
The invention belongs to the technical field of dense sandstone gas exploration and development, and discloses a dense sandstone high-quality reservoir continuity evaluation system, method, equipment and terminal, wherein a river channel internal filling pattern dividing module is used for dividing filling patterns of different river channel sections of a target layer of an analysis area; the river channel cause type dividing module is used for dividing the river channel cause types; the river channel inter-sand body connectivity dividing module is used for dividing river channel sections into three types of unobstructed, partially unobstructed and obstructed; the sand group structure and river channel classification evaluation module is used for dividing sand and mud combinations, determining granularity change and dividing sand structure patterns; and the single sand body reservoir property evaluation module is used for establishing reservoir classification and division basis and evaluating the single sand body reservoirs of different river channels and sand group configurations. According to the invention, high-quality reservoir continuity evaluation analysis is carried out from the angles of river channel sand connectivity, sand group structure and single sand reservoir progressive characterization, and a heterogeneous difference cause mechanism of a tight sandstone reservoir is revealed.
Description
Technical Field
The invention belongs to the technical field of tight sandstone gas exploration and development, and particularly relates to a tight sandstone high-quality reservoir continuity evaluation system, method, equipment and terminal.
Background
Currently, worldwide dense sandstone gas has tremendous resource potential and considerable scale reserves, and it has been found or speculated that developed dense sandstone gas basins are mainly distributed in europe, north america and asia-pacific, up to 70, with a resource volume of about 210 x 10 12m3. The development of dense sandstone gas in North America is the fastest and first successful region worldwide, dense sandstone gas is mainly concentrated in the mountain area of falling foundation, and dense sandstone gas in Canada is mainly concentrated in the deep basin region of the Arabian basin in the west. The large compact gas field in China is mainly distributed in the Erdos basin, sichuan basin and Tarim basin, and is mainly located in the carboy, the two-fold system, the three-fold system, the dwarf system, the chalk system and the ancient-recent system. The method for comprehensively evaluating the characteristics of dense gas and the exploration and development technology of the dwarf system Shaxi temple group and the triax system Hejia river group of Sichuan basin in China have huge potential in exploration and development of dense gas.
The prior art CN202211053997.8 discloses a multi-factor combined conglomerate high-quality reservoir prediction method, which is characterized in that the construction characteristics, sand thickness, sediment microphase, diagenetic effect and pore permeability factors are respectively subjected to single factor analysis with oil saturation, and the single factors are graded; under the constraint of oil saturation, using SPSS analysis software and an analytic hierarchy process to fit a multi-factor quantitative expression of reservoir index RI and the constraint of oil saturation, establishing a reservoir type evaluation standard, finally overlapping a construction plan, a sand thickness graph, a sedimentary microphase plan, a diagenetic plan and a pore-permeation plan, predicting a favorable reservoir distribution rule, and comprehensively delineating dessert reservoir distribution under the control of a construction high point. However, the technology mainly establishes reservoir type evaluation standards from structural characteristics, sand thickness, sediment microphase, diagenetic effect, pore permeation and oil saturation angle analysis, and does not research and define high-quality reservoir distribution rules from the perspective of river sand space distribution.
The prior art CN202010523410.X discloses a method for evaluating the plane homogeneity degree of a reservoir by using high-quality connectivity, wherein the method mainly comprises the steps of determining reservoir property evaluation factors, determining high-quality reservoir plane distribution according to preset conditions, deploying a virtual well pattern in a target area, calculating the total number of injection and production corresponding connection lines of an oil-water well and the high-quality connectivity according to preset conditions, wherein the quotient of the high-quality connectivity and the total number of injection and production corresponding connection lines of the oil-water well is the injection and production high-quality connectivity ratio; and quantitatively evaluating the plane homogeneity degree of the reservoir by using the high-quality communication rate. However, the technical method quantitatively evaluates the plane homogeneity degree of the reservoir based on the quotient of the high-quality communication number and the total number of the injection and production corresponding connection lines of the oil-water well, namely the injection and production high-quality communication ratio, and the high-quality reservoir continuity evaluation is not carried out from the angles of river channel sand body connectivity, sand group structure and single sand body reservoir progressive characterization.
Through the above analysis, the problems and defects existing in the prior art are as follows:
(1) The existing multi-factor combined conglomerate high-quality reservoir prediction method mainly establishes reservoir type evaluation standards from structural characteristics, sand thickness, sediment microphase, diagenetic effect, pore permeation and oil saturation angle analysis, and does not study and define high-quality reservoir distribution rules from the perspective of river sand space exhibition and description.
(2) In the prior art, the plane homogeneity degree of the reservoir is quantitatively evaluated based on the quotient of the quality communication number and the total number of the injection and production corresponding connection lines of the oil-water well, namely the injection and production quality communication ratio, and the continuity evaluation of the quality reservoir is not carried out from the angles of river channel sand connectivity, sand group structure and single sand reservoir progressive characterization.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a system, a method, equipment and a terminal for evaluating the continuity of a high-quality reservoir of compact sandstone, in particular to a system, a method, a medium, equipment and a terminal for evaluating the continuity of a high-quality reservoir based on river channel-sand group-single sand body progressive characterization.
The invention is realized in such a way that a compact sandstone high-quality reservoir continuity evaluation system comprises:
The river channel internal filling pattern dividing module is used for dividing filling patterns of different river channel sections of a target layer of an analysis area based on a micro-phase vertical combination relation of deposition of the analysis area, and comprises a side beach, a side beach filling pattern, a river bed detention deposition, a side beach filling pattern, a side beach, a waste river channel filling pattern, a side beach, a breach fan, a natural dyke filling pattern, an underwater diversion river channel, an underwater river mouth dam filling pattern, an underwater diversion river channel and an underwater natural dyke filling pattern;
The river channel cause type dividing module is used for dividing the river channel cause types on the basis of dividing the filling patterns in the river channel, and dividing the river channel cause types into multi-period superposition type, deep cutting type, abandoned type, accumulation entering type and non-superposition single-stage 5-type cause river channels aiming at analysis and acquisition target layers, wherein the delta plain develops a river channel with 4-type causes, including multi-period superposition type, deep cutting type, abandoned type and non-superposition single-stage type, and the delta front develops a river channel with 3-type causes, including multi-period superposition type, accumulation entering type and non-superposition single-stage type;
The river channel inter-sand body connectivity dividing module is used for establishing a river channel inter-sand body connectivity semi-quantitative evaluation standard based on quantitative evaluation parameters such as a river channel cause type, a sand-mud ratio, a width-depth ratio, a single-well sand body thickness, a interlayer thickness and the like, wherein the sand body connectivity semi-quantitative evaluation standard is formed by multi-stage superposition type and deep cutting type river channel segments, the sand body communication coefficient is more than 87, the sand-mud ratio is more than 0.94, the width-depth ratio is more than 40, the sand body thickness is more than 19m, and the interlayer thickness is less than 28.32m; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand body communication coefficient is between 55 and 87, the sand-mud ratio is between 0.59 and 0.94, the width-depth ratio is between 33 and 40, the thickness of the sand bodies is between 16 and 19m, and the thickness of the interlayer is between 28.32 and 52m; the sand bodies of the waste river channel sections are not smooth, the communication coefficient of the sand bodies is smaller than 55, the sand-mud ratio is smaller than 0.59, the width-depth ratio is smaller than 33, the thickness of the sand bodies is smaller than 16m, and the thickness of the interlayer is larger than 52m; the sand group structure and river classification evaluation module is used for analyzing the filling patterns in the river based on the river cause knowledge, dividing sand-mud combinations, determining granularity change, and dividing the sand group patterns according to production differences, wherein the sand group structure comprises a uniform grain sequence pure sand configuration (A), a positive and negative grain sequence sand-mud-clamping configuration (B) and a positive grain sequence mud-clamping configuration (C); the river channel is divided into 3 classes by integrating the sand body smoothness and configuration among the river channels, reservoir physical properties and production characteristic differences, the class I river channel is a smooth river channel with a configuration of + A, B, the porosity is more than 12%, the permeability is more than 0.50X10-3 mu m <2 >, the pressure coefficient is more than 1, the daily gas yield is more than 30 square, and the longitudinal and transverse wave speed ratio is less than 1.65. And the single sand body reservoir property evaluation module is used for analyzing the lithology, the reservoir scale, the physical property and the productivity relationship, establishing reservoir classification and division basis and evaluating the single sand body reservoirs of different river channels and sand group configurations.
Further, the river course internal filling patterns include side beach and side beach filling, side beach and river bed detention sediment filling, side beach and waste river course filling, side beach and breach fan and natural dyke filling, underwater split river course and underwater split river course filling, underwater split river course and river mouth dam filling, underwater split river course and underwater natural dyke filling.
Further, the river channel cause types comprise a multi-stage overlapped river channel, a deep cut river channel, a waste river channel, an in-accumulation overlapped type and a non-overlapped single-stage secondary river channel; the plane geometry of the multi-stage overlapped and deep cut river channel is medium-low bending wide, the plane geometry of the waste river channel is medium-low bending wide, and the plane geometry of the accumulation-entering overlapped and non-overlapped single-stage secondary river channel is medium-low bending medium-wide and low bending narrow; the multi-stage superposition type, deep cutting type and feeding superposition type river channel width-depth ratio is 39-49, the river bed side area and the adding accumulation are the main, the bottom load type sand-rich sediment is adopted, and the sand bodies are communicated laterally; the waste type and non-superposition single-stage river channel width-depth ratio is 33-37, the riverbed accumulation is mainly, the mixed load type relatively poor sand deposition is adopted, and the sand connectivity is poor.
Further, the sand bodies of the multi-stage superposition type and deep cutting type river channel sections are smooth, the sand body communication coefficient is more than 87, the sand-mud ratio is more than 0.94, the width-depth ratio is more than 40, the thickness of the sand bodies is more than 19m, and the thickness of the interlayer is less than 28.32m; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand body communication coefficient is between 55 and 87, the sand-mud ratio is between 0.59 and 0.94, the width-depth ratio is between 33 and 40, the thickness of the sand bodies is between 16 and 19m, and the thickness of the interlayer is between 28.32 and 52 m; the sand bodies of the waste river channel sections are not smooth, the communication coefficient of the sand bodies is smaller than 55, the sand-mud ratio is smaller than 0.59, the width-depth ratio is smaller than 33, the thickness of the sand bodies is smaller than 16m, and the thickness of the interlayer is larger than 52m.
Further, the sand texture comprises a uniform grain sequence pure sand configuration A, a positive and negative grain sequence sand inclusion mud configuration B and a positive grain sequence sand inclusion mud configuration C; wherein, the A type configuration is a side beach and a side beach filling pattern, the sand and mud combination is developed into a pure sand type, and the granularity is uniform; the B type configuration is a river bed detention sediment and a filling pattern of a side beach, a side beach and a waste river channel, an underwater diversion river channel and a river mouth dam, sand and mud are combined into a sand-mud sandwiched type, and the granularity is positive and negative grain order; the C-type structure is a filling pattern of a beach and a breach fan, a natural dyke, an underwater diversion river channel and an underwater natural dyke, and the sand and mud combination is developed into a mud sand inclusion type, and the granularity is positive grain sequence. And combining production characteristic differences, dividing river channel types according to the unobstructed degree and the configuration, wherein the class I river channel is an unobstructed river channel with A, B configuration, the class II river channel is a local unobstructed river channel with B configuration, and the class III river channel is a local unobstructed river channel with C configuration and an unobstructed river channel with B configuration.
Further, the sandstone lithology type of the analysis zone includes a high pore lithology, a medium pore lithology and a low pore lithology. The class I river channel is mainly composed of high-hole rock-penetrating facies, and the class II river channel and the class III river channel are mainly composed of medium-hole rock-penetrating facies and low-hole rock-penetrating facies; the high, medium and low pore rock seepage phases of the III class river channel develop uniformly, and the medium pore seepage is the main part.
The reservoir classification basis includes: the lithology of the class I reservoir is medium sand, the thickness of the sand body is 20-40 m, the width of river sand is more than 800m, the median radius of pore throats is more than 0.63 mu m, the porosity is more than 12%, and the permeability is more than 0.50X10 -3μm2; the lithology of the II type reservoir is medium-fine sandstone, the thickness of the sand body is 15-40 m, the width of river sand is 600-800 m, the median radius of pore throat is 0.4-0.63 mu m, the porosity is more than 10-12%, and the permeability is more than 0.15-0.50X10 -3μm2; the lithology of the III-class reservoir is fine sandstone, the thickness of sand body is 10-25 m, the width of river sand is less than 600m, the median radius of pore throat is 0.16-0.4 mu m, the porosity is more than 7-10%, and the permeability is 0.05-0.15X10 -3μm2; the IV-class non-reservoir rock is argillaceous siltstone, the pore throat median radius is less than 0.16 mu m, the porosity is less than 7%, and the permeability is less than 0.05X10 -3μm2; the class I riverway develops class I and class II reservoirs, and the gas producing sections are distributed in A, B class configuration and class I and class II reservoirs.
Another object of the present invention is to provide a method for evaluating continuity of a tight sandstone high-quality reservoir using the system for evaluating continuity of a tight sandstone high-quality reservoir, the method comprising: performing high-quality reservoir continuity evaluation analysis based on river channel sand body connectivity, sand group structure and single sand body progressive depiction, and based on development scale, morphology and plane distribution characteristics of the sand bodies, and deposition microphases and combinations of the development, according to filling patterns of different river channel sections, forming types and deposition characteristics of the clear river channels; according to characteristic evaluation parameters of river channel cause types, sand body communication rate, sand-mud ratio and width-depth ratio, defining the connectivity grade and characteristics of sand bodies of different river channel sections; the method comprises the steps of integrating filling patterns, sand and mud combinations and granularity changes in a river channel, and determining sand texture type and characteristics by combining production characteristic differences; the river channel formation type, sand body connectivity and sand structure type evaluation results are synthesized, and the river channel grading evaluation standard and the space distribution rule are defined; and (3) evaluating the single sand reservoir, and determining the single sand reservoir properties of different river channels and sand group configurations according to lithofacies and physical properties.
Further, the method for evaluating the continuity of the high-quality reservoir of the compact sandstone comprises the following steps:
step one, dividing filling patterns in river channels: dividing filling patterns of different river channel sections of a target layer of an analysis area based on a deposition microphase vertical combination relation of the analysis area;
Step two, dividing the channel cause types: on the basis of dividing the filling patterns in the river channel, the plane geometry and scale of the river channel are synthesized, and the cause types of the river channel are divided;
Step three, division of river channel sand connectivity: dividing river channel sections into three types of unobstructed, partially unobstructed and obstructed according to the characteristics of the river channel cause type, the sand body communication rate, the sand-mud ratio and the width-depth ratio;
Step four, classifying and evaluating the sand group structure and the river channel: analyzing the filling patterns in the river channel based on the river channel cause knowledge, dividing sand and mud combinations, determining granularity change, and dividing sand texture patterns according to production differences;
step five, single sand body reservoir property evaluation: and (3) analyzing the relationship among lithology, reservoir scale, physical properties and productivity, establishing reservoir classification and division basis, and evaluating single sand reservoir properties of different river channels and sand group configurations.
Another object of the present invention is to provide a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the tight sandstone premium reservoir continuity evaluation method.
Another object of the present invention is to provide a computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the tight sandstone premium reservoir continuity evaluation method.
The invention further aims at providing an information data processing terminal which is used for realizing the compact sandstone high-quality reservoir continuity evaluation system.
In combination with the technical scheme and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:
First, aiming at the technical problems in the prior art and the difficulty of solving the problems, the technical problems solved by the technical proposal of the invention are analyzed in detail and deeply by tightly combining the technical proposal to be protected, the results and data in the research and development process, and the like, and some technical effects brought after the problems are solved have creative technical effects. The specific description is as follows:
The low-permeability compact sandstone gas reservoir in China has the advantages of abundant resource quantity, wide distribution range and complex structural characteristics of sand bodies in multi-stage river channel sand body superposition development; the rock phase difference inside single sand bodies of different river channel sections is obvious, the physical property difference of sandstone with different layers is large, and the heterogeneity is strong; the sandstone gas-containing property of different river channel sections of different sand groups has large difference, the physical property and gas-containing property of sandstone in different types of river channels have large difference, and the gas-rich difference of river channel sand bodies with different communication degrees is obvious. Aiming at the problems that research on internal structural features of a compact sandstone reservoir is weak and the non-uniformity feature of different river channel sections is not clear, the invention mainly develops high-quality reservoir continuity evaluation analysis from an angle system of river channel sand connectivity, sand group structure and single sand reservoir progressive depiction, and clearly shows the spatial distribution features of river channel sand and the distribution rules of high-quality reservoirs, and reveals a mechanism of the cause of the non-uniformity difference of the compact sandstone reservoir.
The invention develops high-quality reservoir continuity evaluation analysis based on river channel sand body connectivity, sand group structure and single sand body progressive depiction, and based on development scale, morphology and plane distribution characteristics of sand bodies and deposition microphase and combination thereof of development, according to filling patterns of different river channel sections, the origin type and deposition characteristics of the clear river channel are shown; according to characteristic evaluation parameters such as river channel cause type, sand body communication rate, sand-mud ratio, width-depth ratio and the like, determining different river channel segment sand body connectivity grades and characteristics thereof; the method comprises the steps of integrating filling patterns, sand and mud combinations and granularity changes in a river channel, and determining sand texture type and characteristics by combining production characteristic differences; the river channel formation type, sand body connectivity and sand structure type evaluation results are synthesized, and river channel grading evaluation standards and space distribution rules are defined; and (3) carrying out single sand reservoir evaluation, and determining single sand reservoir properties of different river channels and sand group configurations according to lithofacies and physical properties.
Secondly, the technical scheme is regarded as a whole or from the perspective of products, and the technical scheme to be protected has the following technical effects and advantages:
The invention creatively provides a high-quality reservoir continuity evaluation analysis technology based on river channel sand body connectivity, sand group structures and single sand body progressive depiction, which is used for defining the spatial distribution characteristics of river channel sand bodies and the distribution rules of high-quality reservoirs and revealing a mechanism for causing heterogeneity differences of tight sandstone reservoirs. The result of the invention not only effectively solves the bottleneck problem of accelerating the production of dense gas in the process of increasing the storage, provides powerful support for the efficient development of dense gas, but also helps the construction of the 'gas Daqing' of the Chongqing, and ensures the realization of the strategy target of the exploration and development of dense gas.
Thirdly, as inventive supplementary evidence of the claims of the present invention, the following important aspects are also presented:
(1) The expected benefits and commercial values after the technical scheme of the invention is converted are as follows:
The technical support is provided for the efficient exploration and development of dense gas in southwest areas, annual natural gas produced by the oil-gas field of the southwest is assisted to break through 3000 ten thousand tons of oil-gas equivalent, meanwhile, the construction of 'gas Daqing' of the assistance is advanced, the oil-gas is increased to store up the production, and the strategy planning of '500 hundred million of the production in 2025 and 800 hundred million of the production in 2035' is ensured to be realized by dense gas exploration.
(2) The technical scheme of the invention fills the technical blank in the domestic and foreign industries: and carrying out high-quality reservoir continuity evaluation from the angles of river channel sand connectivity, sand group structure and single sand reservoir progressive characterization.
(3) The technical scheme of the invention overcomes the technical bias:
The former research is mainly limited to the basic characteristic research of reservoir petrology, physical properties, reservoir space and the like, and is used for analyzing the main control factors of the high-quality reservoir so as to evaluate the distribution rule of the high-quality reservoir, and the research systematically develops the continuity evaluation of the high-quality reservoir from the angles of river channel sand connectivity, sand group structure and progressive depiction of single sand reservoir.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for evaluating continuity of a tight sandstone high-quality reservoir according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a deposition filling pattern of different river sections according to an embodiment of the present invention;
FIG. 3 is a schematic view of deposition characteristics of different river channel cause types according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a sand texture analysis provided by an embodiment of the present invention;
FIG. 5 is a statistical chart of lithofacies types of sandstone development for different river and sand group configurations provided by embodiments of the present invention;
FIG. 6 is a statistical plot of reservoir types for different river course sand development provided by an embodiment of the present invention;
FIG. 7 is a statistical chart of permeability variation coefficients of different types of river sandstones according to an embodiment of the present invention;
In the figure, ① multiple-stage overlapped river channels; ② Deep cutting type river channel; ③ Waste type river channels; ④ Entering and accumulating a superposition type river channel; ⑤ There is no single-stage secondary river channel.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides a system, a method, equipment and a terminal for evaluating the continuity of a high-quality tight sandstone reservoir, and the invention is described in detail below with reference to the accompanying drawings.
In order to fully understand how the invention may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.
As shown in fig. 1, the method for evaluating the continuity of the high-quality tight sandstone reservoir provided by the embodiment of the invention comprises the following steps:
S101, dividing filling patterns in river channels: dividing filling patterns of different river channel sections of a target layer of an analysis area based on a deposition microphase vertical combination relation of the analysis area;
s102, dividing the channel cause types: on the basis of dividing the filling patterns in the river channel, the plane geometry and scale of the river channel are synthesized, and the cause types of the river channel are divided;
S103, dividing river channel sand connectivity: dividing river channel sections into three types of unobstructed, partially unobstructed and obstructed according to the characteristics of the river channel cause type, the sand body communication rate, the sand-mud ratio and the width-depth ratio;
S104, classifying and evaluating the sand group structure and the river channel: analyzing the filling patterns in the river channel based on the river channel cause knowledge, dividing sand and mud combinations, determining granularity change, and dividing sand texture patterns according to production differences;
S105, single sand body reservoir property evaluation: and (3) analyzing the relationship among lithology, reservoir scale, physical properties and productivity, establishing reservoir classification and division basis, and evaluating single sand reservoir properties of different river channels and sand group configurations.
The system for evaluating the continuity of the high-quality tight sandstone reservoir provided by the embodiment of the invention comprises the following steps:
the river channel internal filling pattern dividing module is used for dividing filling patterns of different river channel sections of a target layer of an analysis area based on a deposition microphase vertical combination relation of the analysis area;
The river channel cause type dividing module is used for dividing the river channel cause types by integrating the plane geometry and scale of the river channel on the basis of dividing the filling patterns in the river channel;
The river channel inter-sand body connectivity dividing module is used for dividing river channel sections into three types of unobstructed, local unobstructed and unobstructed according to the characteristics of the river channel cause type, the sand body communication rate, the sand-mud ratio and the width-depth ratio;
the sand group structure and river classification evaluation module is used for analyzing the filling patterns in the river based on the river cause knowledge, dividing sand-mud combinations, determining granularity change, and dividing the sand group patterns according to production differences;
and the single sand body reservoir property evaluation module is used for analyzing the lithology, the reservoir scale, the physical property and the productivity relationship, establishing reservoir classification and division basis and evaluating the single sand body reservoirs of different river channels and sand group configurations.
In the embodiment of the invention, a river channel internal filling pattern dividing module is used for dividing filling patterns of different river channel sections of a target layer of an analysis area based on a micro-phase vertical combination relation of deposition of the analysis area, wherein the filling patterns comprise a side beach, a side beach filling pattern, a river bed retention deposition, a side beach filling pattern, a side beach, a waste river channel filling pattern, a side beach, a breach fan, a natural dyke filling pattern, an underwater diversion river channel, an underwater mouth dam filling pattern and an underwater diversion river channel and an underwater natural dyke filling pattern;
In the embodiment of the invention, the river channel cause type dividing module is used for dividing the river channel cause types on the basis of the division of the filling patterns in the river channel, integrating the plane geometry and the scale of the river channel, dividing the river channel cause types into multi-stage overlapped, deep cut, abandoned, accumulation-entering overlapped and non-overlapped single-stage type 5-cause river channels aiming at the analysis target layer, wherein the river channel with the delta plain development 4-cause comprises multi-stage overlapped, deep cut, abandoned and non-overlapped single-stage type, and the delta front development 3-cause river channel comprises multi-stage overlapped, accumulation-entering overlapped and non-overlapped single-stage type;
In the embodiment of the invention, the inter-river sand connectivity dividing module establishes a semi-quantitative evaluation standard of inter-river sand connectivity based on quantitative evaluation parameters such as a river cause type, a comprehensive sand-to-mud ratio, a wide depth ratio, a single-well sand thickness, a interlayer thickness and the like, wherein the sand of multi-stage overlapped and deep-cut river channel sections is smooth, the sand communication coefficient is more than 87, the sand-to-mud ratio is more than 0.94, the wide depth ratio is more than 40, the sand thickness is more than 19m, and the interlayer thickness is less than 28.32m; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand body communication coefficient is between 55 and 87, the sand-mud ratio is between 0.59 and 0.94, the width-depth ratio is between 33 and 40, the thickness of the sand bodies is between 16 and 19m, and the thickness of the interlayer is between 28.32 and 52m; the sand bodies of the waste river channel sections are not smooth, the communication coefficient of the sand bodies is smaller than 55, the sand-mud ratio is smaller than 0.59, the width-depth ratio is smaller than 33, the thickness of the sand bodies is smaller than 16m, and the thickness of the interlayer is larger than 52m; the sand group structure and river classification evaluation module is used for analyzing the filling patterns in the river based on the river cause knowledge, dividing sand-mud combinations, determining granularity change, and dividing the sand group patterns according to production differences, wherein the sand group structure comprises a uniform grain sequence pure sand configuration (A), a positive and negative grain sequence sand-mud-clamping configuration (B) and a positive grain sequence mud-clamping configuration (C); the river channel is divided into 3 classes by integrating the sand body smoothness and configuration among the river channels, reservoir physical properties and production characteristic differences, the class I river channel is a smooth river channel with a configuration of + A, B, the porosity is more than 12%, the permeability is more than 0.50X10-3 mu m < 2 >, the pressure coefficient is more than 1, the daily gas yield is more than 30 square, and the longitudinal and transverse wave speed ratio is less than 1.65. And the single sand body reservoir property evaluation module is used for analyzing the lithology, the reservoir scale, the physical property and the productivity relationship, establishing reservoir classification and division basis and evaluating the single sand body reservoirs of different river channels and sand group configurations.
In the river channel internal filling pattern dividing module provided by the embodiment of the invention, the river channel internal filling pattern comprises side beach and side beach filling, side beach and river bed detention deposition filling, side beach and waste river channel filling, side beach and breach fan and natural dyke filling, underwater diversion river channel and underwater diversion river channel filling, underwater diversion river channel and estuary dam filling, and underwater diversion river channel and underwater natural dyke filling.
In the river channel cause type dividing module provided by the embodiment of the invention, the river channel cause types comprise a multi-period overlapped river channel, a deep cut river channel, a waste river channel, an accumulation-entering overlapped river channel and a non-overlapped single-period sub-river channel; the plane geometry of the multi-stage overlapped and deep cut river channel is medium-low bending wide, the plane geometry of the waste river channel is medium-low bending wide, and the plane geometry of the accumulation-entering overlapped and non-overlapped single-stage secondary river channel is medium-low bending medium-wide and low bending narrow; the multi-stage superposition type, deep cutting type and feeding superposition type river channel width-depth ratio is 39-49, the river bed side area and the adding accumulation are the main, the bottom load type sand-rich sediment is adopted, and the sand bodies are communicated laterally; the waste type and non-superposition single-stage river channel width-depth ratio is 33-37, the riverbed accumulation is mainly, the mixed load type relatively poor sand deposition is adopted, and the sand connectivity is poor.
In the river channel inter-sand body connectivity dividing module provided by the embodiment of the invention, the sand bodies of the multi-stage superposition type and deep cutting type river channel sections are smooth, the sand-mud ratio and the width-depth ratio are large, wherein the average sand-body connectivity rate is 83.5%, the sand-mud ratio is 0.94-1.23, and the width-depth ratio is 40-56; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand-mud ratio and the width-depth ratio are large, wherein the sand body communication rate is 65.6% on average, the sand-mud ratio is 0.2-0.78, and the width-depth ratio is 33-37; the sand bodies of the waste river channel sections are not smooth, the sand-mud ratio and the width-depth ratio are small, wherein the communication rate of the sand bodies is 45.9% on average; sand-mud ratio is 0.09-0.59, and width-depth ratio is 19-28; the non-communication rate of sand bodies in the unobstructed river channel section is 17% on average, the sand-mud ratio is more than 0.9, and the width-depth ratio is more than 40; the average non-communication rate of sand bodies in the local unobstructed river channel section is 34 percent, the sand-mud ratio is 0.18-0.81, and the width-depth ratio is less than 40; the non-communication rate of sand bodies in the obstructed river channel section is 54 percent on average, the sand-mud ratio is 0.08-0.63, and the width-depth ratio is less than 40.
In the sand group structure and the river channel classification evaluation module provided by the embodiment of the invention, the sand group structure comprises a uniform grain sequence pure sand structure A, a positive and negative grain sequence sand inclusion structure B and a positive grain sequence mud inclusion structure C; wherein, the A type configuration is a side beach and a side beach filling pattern, the sand and mud combination is developed into a pure sand type, and the granularity is uniform; the B type configuration is a river bed detention sediment and a filling pattern of a side beach, a side beach and a waste river channel, an underwater diversion river channel and a river mouth dam, sand and mud are combined into a sand-mud sandwiched type, and the granularity is positive and negative grain order; the C-type structure is a filling pattern of a beach and a breach fan, a natural dyke, an underwater diversion river channel and an underwater natural dyke, and the sand and mud combination is developed into a mud sand inclusion type, and the granularity is positive grain sequence. And combining production characteristic differences, dividing river channel types according to the unobstructed degree and the configuration, wherein the class I river channel is an unobstructed river channel with A, B configuration, the class II river channel is a local unobstructed river channel with B configuration, and the class III river channel is a local unobstructed river channel with C configuration and an unobstructed river channel with B configuration.
In the single sand body reservoir property evaluation module provided by the embodiment of the invention, the sandstone lithology type of the analysis area comprises a high pore lithology infiltration phase, a medium pore lithology infiltration phase and a low pore lithology infiltration phase. The class I river channel is mainly composed of high-hole rock-penetrating facies, and the class II river channel and the class III river channel are mainly composed of medium-hole rock-penetrating facies and low-hole rock-penetrating facies; the high, medium and low pore rock seepage phases of the III class river channel develop uniformly, and the medium pore seepage is the main part.
The reservoir classification and division basis provided by the embodiment of the invention comprises the following steps: the lithology of the class I reservoir is medium sand, the thickness of the sand body is 20-40 m, the width of river sand is more than 800m, the median radius of pore throats is more than 0.63 mu m, the porosity is more than 12%, and the permeability is more than 0.50X10 -3μm2; the lithology of the II type reservoir is medium-fine sandstone, the thickness of the sand body is 15-40 m, the width of river sand is 600-800 m, the median radius of pore throat is 0.4-0.63 mu m, the porosity is more than 10-12%, and the permeability is more than 0.15-0.50X10 -3μm2; the lithology of the III-class reservoir is fine sandstone, the thickness of sand body is 10-25 m, the width of river sand is less than 600m, the median radius of pore throat is 0.16-0.4 mu m, the porosity is more than 7-10%, and the permeability is 0.05-0.15X10 -3μm2; the IV-class non-reservoir rock is argillaceous siltstone, the pore throat median radius is less than 0.16 mu m, the porosity is less than 7%, and the permeability is less than 0.05X10 -3μm2; the class I riverway develops class I and class II reservoirs, and the gas producing sections are distributed in A, B class configuration and class I and class II reservoirs.
The embodiment of the invention has a great advantage in the research and development or use process, compared with the prior art, the embodiment of the invention has great advantages, and the following is described with reference to data, charts and the like in the experimental process.
As a preferred embodiment, the method for evaluating the continuity of the high-quality tight sandstone reservoir provided by the embodiment of the invention specifically comprises the following steps:
(1) River channel internal filling pattern and river channel cause type analysis
The invention takes Chuan Zhong Jinqiu gas field as an example, and mainly develops delta plain to front edge subphase. Sand bodies of the delta plain in the analysis area develop in 5 deposition micro-phases such as side beaches, riverbed detention deposition, abandoned riverways, breach fans, natural dykes and the like; sand bodies at the front edge of the delta develop in 3 deposition micro-phases such as underwater diversion river channels, estuary dams, underwater natural dykes and the like. Based on the analysis area sediment microphase vertical combination relationship, the filling patterns of different river channel sections of a target layer of the analysis area are divided into 7 types (see figure 2), including side beach and side beach filling, side beach and river bed detention sediment filling, side beach and waste river channel filling, side beach and breach fan and natural dyke filling, underwater diversion river channel and underwater diversion river channel filling, underwater diversion river channel and estuary dam filling, and underwater diversion river channel and underwater natural dyke filling. On the basis of dividing the filling patterns in the river channel, the plane geometry and scale of the river channel are integrated, and the river channel cause types are divided into 5 types, including multi-stage overlapped river channels, deep cut river channels, abandoned river channels, in-accumulation overlapped river channels and non-overlapped single-stage river channels (see figure 2). The plane geometry of the multi-stage overlapped and deep cut river channel is medium-low-bending wide, the plane geometry of the waste river channel is medium-low-bending wide, and the plane geometry of the in-product overlapped and non-overlapped single-stage secondary river channel is medium-low-bending medium-wide and low-bending narrow. The multi-stage superposition type, deep cutting type and in-accumulation superposition type river channel width-depth ratio is 39-49, the river bed side area and the accumulation are the main, the bottom load type sand-rich sediment is adopted, and the sand bodies are communicated laterally; the waste and non-overlapping single-stage river channel width-depth ratio is 33-37, the riverbed accumulation is mainly, the mixed load type relatively lean sand deposition is adopted, and the sand connectivity is poor (see figure 3).
(2) River channel inter-sand connectivity analysis
The river channel sections are divided into three types, namely unobstructed and locally unobstructed and obstructed according to the characteristics of the cause type, the sand body communication rate, the sand-mud ratio, the width-depth ratio and the like of the river channel. Wherein, the sand bodies of the multi-stage superposition type and deep cutting type river channel sections are smooth, the sand-mud ratio and the width-depth ratio are large, the average sand-body communication rate is 83.5 percent, the sand-mud ratio is 0.94-1.23, and the width-depth ratio is 40-56; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand-mud ratio and the width-depth ratio are large, wherein the sand body communication rate is 65.6% on average, the sand-mud ratio is 0.2-0.78, and the width-depth ratio is 33-37; the sand bodies of the waste river channel sections are not smooth, the sand-mud ratio and the width-depth ratio are small, wherein the communication rate of the sand bodies is 45.9% on average; the sand-mud ratio is 0.09-0.59, and the width-depth ratio is 19-28. The non-communication rate of sand bodies in the unobstructed river channel section is 17% on average, the sand-mud ratio is more than 0.9, and the width-depth ratio is more than 40; the average non-communication rate of sand bodies in the local unobstructed river channel section is 34 percent, the sand-mud ratio is 0.18-0.81, and the width-depth ratio is less than 40; the non-communication rate of sand bodies in the obstructed river channel section is 54 percent on average, the sand-mud ratio is 0.08-0.63, and the width-depth ratio is less than 40.
(3) Sand group structure and river classification evaluation
Analyzing the filling pattern in the river channel based on the river channel cause recognition, dividing the sand-mud combination, determining the granularity change, and comparing the production difference to divide the sand texture into a uniform grain-order pure sand configuration (A), a positive and negative grain-order sand-mud clamping configuration (B) and a positive grain-order mud-sand clamping configuration (C) (see figure 4). The method comprises the steps of a multi-stage overlapped river development flushing cutting type pure sand mold combination and a flushing contact type sand mud-inclusion mold combination, a deep cutting type river development flushing cutting type pure sand mold combination, a waste and accumulation entering overlapped river development flushing contact type sand mud-inclusion mold combination and a non-overlapped single-stage secondary river development isolated type mud-inclusion mold combination. Wherein, the A type configuration is a side beach and a side beach filling pattern, the sand and mud combination is developed into a pure sand type, and the granularity is uniform; the B type configuration is a river bed detention sediment and a filling pattern of a side beach, a side beach and a waste river channel, an underwater diversion river channel and a river mouth dam, sand and mud are combined into a sand-mud sandwiched type, and the granularity is positive and negative grain order; the C-type structure is a filling pattern of a beach and a breach fan, a natural dyke, an underwater diversion river channel and an underwater natural dyke, and the sand and mud combination is developed into a mud sand inclusion type, and the granularity is positive grain sequence. Smooth multi-stage overlapped river (scouring cutting type overlapped) developed pure sand type combination (A configuration), uniform change of granularity and high yield. Smooth multi-stage superposition (scouring contact superposition) and deep cutting, local smooth accumulation-entering superposition type river development sand-mud combination (B configuration) is characterized by positive grain sequence and reverse grain sequence, and the yield is higher. The local unobstructed non-overlapping single-stage secondary river channel section development mud sand inclusion type combination (C configuration) has low yield. And combining production characteristic differences, dividing river channel types according to the unobstructed degree and the configuration, wherein the class I river channel is an unobstructed river channel with A, B configuration, the class II river channel is a local unobstructed river channel with B configuration, and the class III river channel is a local unobstructed river channel with C configuration and an unobstructed river channel with B configuration.
(4) Single sand reservoir evaluation
The analysis area is mainly medium and fine rock debris feldspar sandstone, and the lithology change is not large; the clay mineral is mainly chlorite, and has low filler content. The main compaction effect is realized, the local turbid zeolite is cemented with calcite, the chlorite edge develops, the weaker feldspar corrosion effect exists, and the storage space is mainly a primary hole. Analysis zone development 3 major sandstone lithofacies types, namely: high pore and medium pore and low pore litho phases. Class I river channels (open and A, B configurations) are dominated by high pore rock-penetrating phase combinations, class II river channels (partially open and B configurations) and class III river channels (partially open and C configurations) are dominated by medium and low pore rock-penetrating phases; the high, medium and low pore-permeability rock phases of the III river channel (unsmooth and B configuration) develop, and the medium pore-permeability mainly exists (see figure 5). And establishing a reservoir classification and division basis by considering the relationship among lithology, reservoir scale, physical properties and productivity. The lithology of the type I reservoir is medium sand, the thickness of the sand body is 20-40 m, the width of river sand is more than 800m, the median radius of pore throats is more than 0.63 mu m, the porosity is more than 12%, and the permeability is more than 0.50X10 -3μm2; the lithology of the II type reservoir is medium-fine sandstone, the thickness of the sand body is 15-40 m, the width of river sand is 600-800 m, the median radius of pore throat is 0.4-0.63 mu m, the porosity is more than 10-12%, and the permeability is more than 0.15-0.50X10 -3μm2; the lithology of the III-class reservoir is fine sandstone, the thickness of sand body is 10-25 m, the width of river sand is less than 600m, the median radius of pore throat is 0.16-0.4 mu m, the porosity is more than 7-10%, and the permeability is 0.05-0.15X10 -3μm2; the IV-class non-reservoir rock is argillaceous siltstone, the pore throat median radius is less than 0.16 mu m, the porosity is less than 7%, and the permeability is less than 0.05X10 -3μm2; the sand body of the class I river channel (smooth and A, B configuration) is weak in heterogeneity, the class I reservoir layer and the class II reservoir layer are mainly developed (see fig. 6 and 7), the average daily yield of the class I river channel can reach 28.5 square per day, and the main gas production sections are distributed in the class A, B configuration and the class I reservoir layer and the class II reservoir layer; sand daily gas production of A, B types of configurations and I and II types of reservoirs is generally more than 30 square per day.
It should be noted that the embodiments of the present invention can be realized in hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The device of the present invention and its modules may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (6)
1. A tight sandstone premium reservoir continuity evaluation system, comprising:
the river channel internal filling pattern dividing module is used for dividing filling patterns of different river channel sections of a target layer of an analysis area based on a deposition microphase vertical combination relation of the analysis area;
The river channel cause type dividing module is used for dividing the river channel cause types by integrating the plane geometry and scale of the river channel on the basis of dividing the filling patterns in the river channel;
The river channel inter-sand body connectivity dividing module is used for dividing river channel sections into three types of unobstructed, local unobstructed and unobstructed according to the characteristics of the river channel cause type, the sand body communication rate, the sand-mud ratio and the width-depth ratio;
the sand group structure and river classification evaluation module is used for analyzing the filling patterns in the river based on the river cause knowledge, dividing sand-mud combinations, determining granularity change, and dividing the sand group patterns according to production differences;
The single sand body reservoir property evaluation module is used for analyzing lithology, reservoir scale, physical property and productivity relationship, establishing reservoir classification and division basis and evaluating single sand body reservoirs of different river channels and sand group configurations;
The sand texture comprises a uniform grain sequence pure sand configuration A, a positive and negative grain sequence sand inclusion configuration B and a positive grain sequence sand inclusion configuration C; wherein, the A type configuration is a side beach and a side beach filling pattern, the sand and mud combination is developed into a pure sand type, and the granularity is uniform; the B type configuration is a river bed detention sediment and a filling pattern of a side beach, a side beach and a waste river channel, an underwater diversion river channel and a river mouth dam, sand and mud are combined into a sand-mud sandwiched type, and the granularity is positive and negative grain order; the C-type structure is a side beach and breach fan and a natural dyke, an underwater diversion river channel and an underwater natural dyke filling pattern, sand and mud are combined and developed into a mud sand inclusion type, and the granularity is positive grain sequence; the river channel types are divided according to the unobstructed degree and the configuration by combining the production characteristic difference, the class I river channel is an unobstructed river channel with A, B configuration, the class II river channel is a local unobstructed river channel with B configuration, and the class III river channel is a local unobstructed river channel with C configuration and an unobstructed river channel with B configuration;
The sandstone lithology type of the analysis area comprises a high-pore lithology infiltration phase, a medium-pore lithology infiltration phase and a low-pore lithology infiltration phase; the class I river channel is mainly composed of high-hole rock-penetrating facies, and the class II river channel and the class III river channel are mainly composed of medium-hole rock-penetrating facies and low-hole rock-penetrating facies; the high, medium and low pore rock seepage phases of the III class river channel develop uniformly, and the medium pore seepage is the main part;
The reservoir classification basis includes: the lithology of the class I reservoir is medium sand, the thickness of the sand body is 20-40 m, the width of river sand is more than 800m, the median radius of pore throats is more than 0.63 mu m, the porosity is more than 12%, and the permeability is more than 0.50X10 -3μm2; the lithology of the II type reservoir is medium-fine sandstone, the thickness of the sand body is 15-40 m, the width of river sand is 600-800 m, the median radius of pore throat is 0.4-0.63 mu m, the porosity is more than 10-12%, and the permeability is more than 0.15-0.50X10 -3μm2; the lithology of the III-class reservoir is fine sandstone, the thickness of sand body is 10-25 m, the width of river sand is less than 600m, the median radius of pore throat is 0.16-0.4 mu m, the porosity is more than 7-10%, and the permeability is 0.05-0.15X10 -3μm2; the IV-class non-reservoir rock is argillaceous siltstone, the pore throat median radius is less than 0.16 mu m, the porosity is less than 7%, and the permeability is less than 0.05X10 -3μm2; the class I riverway develops class I and class II reservoirs, and gas producing sections are distributed in A, B class configurations and class I and class II reservoirs;
The method for evaluating the continuity of the high-quality tight sandstone reservoir by using the system for evaluating the continuity of the high-quality tight sandstone reservoir comprises the following steps: performing high-quality reservoir continuity evaluation analysis based on river channel sand body connectivity, sand group structure and single sand body progressive depiction, and based on development scale, morphology and plane distribution characteristics of the sand bodies, and deposition microphases and combinations of the development, according to filling patterns of different river channel sections, forming types and deposition characteristics of the clear river channels; according to characteristic evaluation parameters of river channel cause types, sand body communication rate, sand-mud ratio and width-depth ratio, defining the connectivity grade and characteristics of sand bodies of different river channel sections; the method comprises the steps of integrating filling patterns, sand and mud combinations and granularity changes in a river channel, and determining sand texture type and characteristics by combining production characteristic differences; the river channel formation type, sand body connectivity and sand structure type evaluation results are synthesized, and the river channel grading evaluation standard and the space distribution rule are defined; single sand reservoir evaluation is carried out, and single sand reservoir properties of different river channels and sand group configurations are defined according to lithofacies and physical properties;
the method for evaluating the continuity of the high-quality reservoir of the compact sandstone comprises the following steps:
step one, dividing filling patterns in river channels: dividing filling patterns of different river channel sections of a target layer of an analysis area based on a deposition microphase vertical combination relation of the analysis area;
Step two, dividing the channel cause types: on the basis of dividing the filling patterns in the river channel, the plane geometry and scale of the river channel are synthesized, and the cause types of the river channel are divided;
Step three, division of river channel sand connectivity: dividing river channel sections into three types of unobstructed, partially unobstructed and obstructed according to the characteristics of the river channel cause type, the sand body communication rate, the sand-mud ratio and the width-depth ratio;
Step four, classifying and evaluating the sand group structure and the river channel: analyzing the filling patterns in the river channel based on the river channel cause knowledge, dividing sand and mud combinations, determining granularity change, and dividing sand texture patterns according to production differences;
step five, single sand body reservoir property evaluation: and (3) analyzing the relationship among lithology, reservoir scale, physical properties and productivity, establishing reservoir classification and division basis, and evaluating single sand reservoir properties of different river channels and sand group configurations.
2. The tight sandstone premium reservoir continuity evaluation system of claim 1, wherein the river course internal filling patterns comprise beach and beach filling, beach and riverbed retention and deposition filling, beach and waste river course filling, beach and breach fan and natural dike filling, underwater split river course and underwater split river course filling, underwater split river course and estuary dam filling, underwater split river course and underwater natural dike filling;
The river channel cause type comprises a multi-stage overlapped river channel, a deep cutting river channel, a waste river channel, an accumulation-entering overlapped type and a non-overlapped single-stage type river channel; the plane geometry of the multi-stage overlapped and deep cut river channel is medium-low bending wide, the plane geometry of the waste river channel is medium-low bending wide, and the plane geometry of the accumulation-entering overlapped and non-overlapped single-stage secondary river channel is medium-low bending medium-wide and low bending narrow; the multi-stage superposition type, deep cutting type and feeding superposition type river channel width-depth ratio is 39-49, the river bed side area and the adding accumulation are the main, the bottom load type sand-rich sediment is adopted, and the sand bodies are communicated laterally; the waste type and non-superposition single-stage river channel width-depth ratio is 33-37, the riverbed accumulation is mainly, the mixed load type relatively poor sand deposition is adopted, and the sand connectivity is poor.
3. The tight sandstone high-quality reservoir continuity evaluation system of claim 1, wherein the multi-stage superimposed and deep cut river channel segments are smooth with a sand body communication coefficient greater than 87, a sand-to-mud ratio greater than 0.94, a width-to-depth ratio greater than 40, a sand body thickness greater than 19m, and a spacer layer thickness less than 28.32m; the sand bodies of the inlet accumulation superposition type and non-superposition single-stage secondary river channel sections are partially unobstructed, the sand body communication coefficient is between 55 and 87, the sand-mud ratio is between 0.59 and 0.94, the width-depth ratio is between 33 and 40, the thickness of the sand bodies is between 16 and 19m, and the thickness of the interlayer is between 28.32 and 52 m; the sand bodies of the waste river channel sections are not smooth, the communication coefficient of the sand bodies is smaller than 55, the sand-mud ratio is smaller than 0.59, the width-depth ratio is smaller than 33, the thickness of the sand bodies is smaller than 16m, and the thickness of the interlayer is larger than 52m.
4. An information data processing terminal, characterized in that the information data processing terminal is used for realizing the tight sandstone quality reservoir continuity evaluation system according to any one of claims 1 to 3.
5. A computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the tight sandstone premium reservoir continuity evaluation method of the tight sandstone premium reservoir continuity evaluation system of any one of claims 1 to 3.
6. A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the tight sandstone premium reservoir continuity evaluation method of the tight sandstone premium reservoir continuity evaluation system as claimed in any one of claims 1 to 3.
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