CN111832962A - Method for establishing oil field proven reserves quality rapid evaluation chart - Google Patents
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Abstract
The invention relates to a method for establishing a chart for rapidly evaluating the quality of an oilfield proven reserve, which comprises the following steps: a, collecting data of the formation crude oil viscosity, the reservoir permeability and the reserve scale of a confirmed reserve unit in an oil field to be evaluated; b, establishing a rectangular coordinate graph, wherein the viscosity of the crude oil of the stratum is taken as a horizontal coordinate, and the permeability of the reservoir is taken as a vertical coordinate; c, setting the horizontal and vertical coordinate axes in the step b as logarithmic coordinate axes respectively to obtain logarithmic horizontal and vertical coordinate axes; d, taking different horizontal and vertical coordinate values on the logarithmic horizontal and vertical coordinate axes to obtain an intersection graph model; e, counting the viscosity of the crude oil in the stratum, the permeability of the reservoir and the reserve scale of the ascertained reserve unit in the oil field to be evaluated in the step a, putting the reservoir and the reserve scale into a cross plot model in a circular scatter point mode, and then judging the reserve quality of different plane blocks or longitudinal horizons. The method can quickly master the quality characteristics of the oilfield exploration reserve unit and has great practicability.
Description
Technical Field
The invention relates to a method for establishing a chart for rapidly evaluating the ascertained reserves of an oil field, belonging to the technical field of the evaluation of the reserves of the oil field.
Background
The ascertained reserves are the basis of oil field development, the quality of ascertained reserves is directly related to the difficulty and the development effect of oil field development, the high-quality reserves are easy to develop, and otherwise, the high-quality reserves are difficult to develop. A careful reservoir quality evaluation research relates to the aspect of oil field development, including multiple geological reservoir key factors. Various types of evaluation parameters relating to reserve quality are up to tens of items: the method comprises the following steps of constructing characteristic parameters (trap scale, area containing oil and gas, fracture scale, oil reservoir amplitude and the like), reservoir characteristic parameters (effective thickness, porosity, permeability, interlayer frequency and the like), oil reservoir characteristic parameters (oil saturation, volume coefficient, formation crude oil viscosity, oil column height and the like), and reserve quality parameters (reserve scale, reserve abundance, reserve concentration, reserve overlap ratio, gas cap index, water body multiple, oil-gas transition zone index, oil-water transition zone index and the like).
In the early stage of oil field development, generally, well point data is few, well spacing is large, and oil reservoir understanding often has larger uncertainty. In a limited research period, in order to avoid risks and ensure that a development scheme has enough flexibility and risk responsiveness to the greatest extent, parameters with the closest relation to the oil reservoir characteristics need to be screened, the quality of the ascertained reserves is simply, intuitively and effectively classified, and the scale and distribution of the high-quality reserves are implemented to serve as a material basis for basic well pattern deployment of the development scheme. Therefore, it is necessary to develop a tool plate for ascertaining the rapid evaluation of reserves quality, which provides an effective tool for developing reserves quality research in the early stage of development by using the classification limits of a large number of developed and mature oil fields as a reference.
Aiming at the method for ascertaining the rapid evaluation of the reserve quality, a great deal of research work is done by various oil and gas fields and scientific research institutes of colleges and universities in order to ensure the authenticity and rationality of a judgment result, but the technical method is generally complicated and complicated, and has not obtained great progress in the aspects of application universality and tool flexibility.
Disclosure of Invention
Aiming at the outstanding problems, the invention provides the method for establishing the plate for quickly evaluating the quality of the ascertained reserves of the oil field, which can quickly finish quality classification of the ascertained reserves and implement high-quality reserve characteristics in the early stage of development of the oil field.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for establishing a chart for rapidly evaluating the quality of an oilfield ascertained reserve comprises the following steps:
a, collecting data of the formation crude oil viscosity, the reservoir permeability and the reserve scale of a confirmed reserve unit in an oil field to be evaluated;
b, establishing a rectangular coordinate graph, wherein the viscosity of the crude oil of the stratum is taken as an abscissa, and the permeability of the reservoir is taken as an ordinate;
c, setting the horizontal and vertical coordinate axes in the step b as logarithmic coordinate axes respectively to obtain logarithmic horizontal and vertical coordinate axes;
d, taking different horizontal and vertical coordinate values on the logarithmic horizontal and vertical coordinate axes, and setting different auxiliary line marks to obtain an intersection graph model;
e, counting the formation crude oil viscosity, the reservoir permeability and the unit proven reserve scale of the ascertained reserve unit in the oil field to be evaluated in the step a, taking the formation crude oil viscosity, the reservoir permeability and the unit ascertained reserve scale as parameters for reflecting the ascertained reserve quality, putting the parameters into the cross-plot model in the form of circular scatter points, and then judging the reserve quality of different plane blocks or longitudinal horizons.
Preferably, the establishing method includes the following steps:
the abscissa axis is set as a logarithmic axis, the minimum value is set to 1, the maximum value is set to 20000, the ordinate axis is set as a logarithmic axis, the minimum value is set to 0.01, and the maximum value is set to 20000.
Preferably, the establishing method includes the following steps:
marking the positions of the formation crude oil with the viscosity of 50 and 350 on the abscissa axis, marking the positions of the reservoir permeability of 10, 50 and 500 on the ordinate axis, respectively making auxiliary thickened solid lines parallel to the ordinate axis and the abscissa axis at the positions of the formation crude oil with the viscosity of 350 and the reservoir permeability of 10, and respectively making auxiliary dotted lines parallel to the ordinate axis and the abscissa axis at the positions of the formation crude oil with the viscosity of 50 and the reservoir permeability of 50; different marks are arranged on the abscissa axis and the ordinate axis.
Preferably, the establishing method further includes the following steps:
d1) creating four rectangular coordinate graphs with the same length and width in Excel, setting the abscissa axis of the first graph as a logarithmic scale axis with the reference of 10, reverse-order scale and main unit of 10000, and setting the coordinate value crossed with the ordinate axis as 1; the ordinate axis is set as a logarithmic scale axis with the reference of 10 and the main unit of 1000, and the coordinate value crossed with the abscissa axis is 0.01;
d2) the abscissa axis of the second graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale, and a main unit of 50, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with the reference of 50 and the main unit of 5000, and the coordinate value crossed with the abscissa axis is 0.01;
d3) the abscissa axis of the third graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale, and a main unit of 50, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with a reference of 50 and a main unit of 1000, and a coordinate value intersecting the abscissa axis is 0.01;
d4) the abscissa axis of the fourth graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale and a main unit of 350, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with the reference of 50 and the main unit of 50000, and the coordinate value crossed with the abscissa axis is 0.01;
d5) the four graphs in the steps d1) to d4) are overlapped in the middle of Excel to obtain a cross-graph model.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the invention, based on the research on the reserve quality of the oilfield exploration reserve unit, the quality parameters such as the viscosity of the formation crude oil, the permeability of a reservoir and the reserve scale of the exploration reserve unit, which influence the development of the oilfield, are systematically considered, a right-angle coordinate graph reflecting three quality parameters is established to perform classified evaluation on the oilfield exploration reserve unit, the viscosity of the formation crude oil and the permeability of the reservoir are used as main control parameters, the reserve scale of the exploration reserve unit is used as a secondary control parameter, the graph is simple and visual, the quick classified evaluation can be performed on the exploration reserve units with various qualities, and the development scheme compilation of the oilfield exploration reserve unit can be further guided;
2. according to the right-angle coordinate diagram established by the invention, the reserve quality is divided into a plurality of intervals through the viscosity of the formation crude oil and the permeability of the reservoir, the ascertained reserve unit with the permeability of the reservoir being more than 50mD and the viscosity of the formation crude oil being less than 50mPa.s belongs to a medium-high-permeability and conventional crude oil reserve unit with the optimal quality, and if a unit with a large oil field reserve scale is mainly positioned in the interval, the oil field development difficulty is small; the reservoir permeability is more than 50mD, the stratum crude oil viscosity is more than 350mPa.s, the ascertained reserves unit belongs to the low-permeability and extra-thick crude oil reserves unit with the worst quality, and if the unit with the larger oil field reserve scale is mainly positioned in the interval, the oil field development difficulty is larger. The ascertained reserve units located in the other intervals belong to an intermediate type of quality. The chart board established by the invention is convenient for oilfield developers to use in combination with actual conditions, can quickly master the quality characteristics of the oilfield exploratory reserve unit, has great practicability and applicability, and can be widely applied to the field of oilfield development geology.
Drawings
FIG. 1 is a schematic diagram of a classification chart in which only the formation crude oil viscosity and the reservoir permeability are considered in the established interchange map model according to the present invention;
FIG. 2 is a graphical illustration of a classification chart in which only the formation crude oil viscosity and the reservoir permeability are considered for a field in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a classification chart of an oil field according to the embodiment of the invention, which comprehensively considers the viscosity of the crude oil in the formation, the permeability of the reservoir and the reserve size of the ascertained reserve unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The viscosity of the crude oil in the stratum is a parameter reflecting the difficulty of the crude oil flowing under the condition of oil reservoir temperature and pressure, the larger the value is, the poorer the flowability of the crude oil is, and the better the flowability is, and the parameter can be used as a reserve quality parameter reflecting the flowability of the crude oil. The reservoir permeability is a parameter reflecting the capacity of allowing fluid to pass through the reservoir under a certain pressure difference, the larger the value is, the better the performance of the reservoir conducting fluid is, and the worse the value is, the parameter can be used as a reserve quality parameter reflecting the reservoir seepage capacity. The exploration reserve unit generally refers to a single oil reservoir in an oil field, is a calculation unit for calculating exploration reserve of the oil field, and each oil reservoir is provided with a fluid (oil, gas and water) interface and a pressure system which are independent of each other. An oil field is often composed of a plurality of ascertained reserves units, the reserve scale of each unit is the basis of oil field development, on the premise that the technology is feasible and has commercial value, the larger the reserve scale of the ascertained reserves units is, the more concentrated the spatial distribution is, the better the oil field development benefit is, otherwise, the worse the parameter is, the parameter can be used as a reserve quality parameter reflecting the oil field reserve scale and distribution condition. The three reserve quality parameters can basically reflect the characteristics of reservoirs, fluids, reserves and the like in the oil field, so that the comprehensive application is favorable for quickly judging the ascertained reserve quality condition of the oil field.
The oil field development usually relates to oil reservoirs of a plurality of longitudinal sleeve series, the oil reservoirs of a shallow series have the characteristics of larger viscosity and larger permeability of stratum crude oil due to weaker diagenetic action, and the oil reservoirs of a deep series have the characteristics of smaller viscosity and smaller permeability of stratum crude oil due to stronger diagenetic action. The change range of the formation crude oil viscosity value of the deep and shallow oil reservoir is large, the minimum value can be smaller than 50mPa.s, the maximum value can exceed 10000mPa.s, the change range of the reservoir permeability is large, the minimum value can be smaller than 5mD, the maximum value can exceed 1000mD, and in order to avoid that scattered points on a rectangular coordinate graph are distributed too intensively and are not beneficial to analyzing the difference of the reserves quality, logarithmic coordinates need to be adopted for an abscissa axis and an ordinate axis.
In the invention, the ascertained reserve unit with the reservoir permeability of more than 50mD and the formation crude oil viscosity of less than 50mPa.s belongs to a medium-high permeability and conventional crude oil reserve unit with optimal quality, and if a unit with large oil field reserve scale is mainly positioned in the interval, the oil field development difficulty is small; the reservoir permeability is more than 50mD, the stratum crude oil viscosity is more than 350mPa.s, the ascertained reserves unit belongs to the low-permeability and extra-thick crude oil reserves unit with the worst quality, and if the unit with the larger oil field reserve scale is mainly positioned in the interval, the oil field development difficulty is larger. The ascertained reserve units located in the other intervals belong to an intermediate type of quality.
The method for establishing the chart for rapidly evaluating the oilfield ascertained reserves comprises the following steps:
a, collecting data of the formation crude oil viscosity, the reservoir permeability and the reserve scale of a confirmed reserve unit in an oil field to be evaluated;
b, establishing a rectangular coordinate graph, wherein the viscosity of the crude oil of the stratum is taken as a horizontal coordinate, and the permeability of the reservoir is taken as a vertical coordinate;
c, setting the abscissa axis as a logarithmic axis, setting the minimum value as 1, setting the maximum value as 20000, setting the ordinate axis as a logarithmic axis, setting the minimum value as 0.01 and setting the maximum value as 20000;
d, taking different horizontal and vertical coordinate values on the logarithmic horizontal and vertical coordinate axes, and setting different auxiliary line marks to obtain an intersection graph model;
e, counting the formation crude oil viscosity, the reservoir permeability and the unit proven reserve scale of the ascertained reserve units in the oil field to be evaluated in the step a as parameters for reflecting the ascertained reserve quality, putting the parameters into the cross-plot model in the form of circular scattered points, setting the area of each circular scattered point as the reserve scale of each ascertained reserve unit, and then judging the reserve quality of different plane blocks or longitudinal horizons.
In this embodiment, preferably, step d includes the following specific steps:
marking positions with the formation crude oil viscosity of 50 and 350 on an abscissa axis, marking positions with the reservoir permeability of 10, 50 and 500 on an ordinate axis, respectively making auxiliary thickened solid lines parallel to the ordinate axis and the abscissa axis at the positions with the formation crude oil viscosity of 350 and the reservoir permeability of 10, and respectively making auxiliary dotted lines parallel to the ordinate axis and the abscissa axis at the positions with the formation crude oil viscosity of 50 and the reservoir permeability of 50; and setting different marks on the abscissa axis and the ordinate axis to obtain the intersection model.
In this embodiment, preferably, step d further includes the following specific steps:
d1) creating four rectangular coordinate graphs with the same length and width in Excel, setting the abscissa axis of the first graph as a logarithmic scale axis with the reference of 10, reverse-order scale and main unit of 10000, and setting the coordinate value crossed with the ordinate axis as 1; the ordinate axis is set as a logarithmic scale axis with a reference of 10 and a main unit of 1000, and a coordinate value intersecting with the abscissa axis is 0.01;
d2) the abscissa axis of the second graph is set as a logarithmic scale axis with the reference of 10, a reverse order scale and a main unit of 50, and the coordinate value crossed with the ordinate axis is 1; the ordinate axis is set to a logarithmic scale axis with a reference of 50 and a main unit of 5000, and a coordinate value intersecting the abscissa axis is 0.01;
d3) the abscissa axis of the third graph is set as a logarithmic scale axis with the reference of 10, a reverse order scale and a main unit of 50, and the coordinate value crossed with the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with a reference of 50 and a main unit of 1000, and the coordinate value intersecting the abscissa axis is 0.01;
d4) the abscissa axis of the fourth graph is set as a logarithmic scale axis with the reference of 10, a reverse order scale and a main unit of 350, and the coordinate value crossed with the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with a reference of 50 and a main unit of 50000, and the coordinate value intersecting the abscissa axis is 0.01;
d5) the four graphs in steps d1) to d4) were centered and overlaid in Excel to obtain a cross-graph model.
In this example, the abscissa axis is named "viscosity" and has units of mpa.s, the ordinate axis is named "permeability" and has units of mD, a legend is set according to the classification of the input scattering points, and a scale for ascertaining the reserve size is drawn according to the sizes of the input scattering points.
The oil field exploration reserves quality quick evaluation chart manufactured by the method for establishing the oil field exploration reserves quality quick evaluation chart is described in detail by specific embodiments, taking an oil field exploration reserves unit A as an example:
the A oil field is located in a Bohai sea area and is a large sandstone oil field with a plurality of oil-bearing layer systems, the exploration storage unit is mainly located in a recent librarian pottery group, an ancient-system eastern-style group and a sand river street group, the exploration storage unit mainly comprises an east block and a west block, the east block and the west block are oil-bearing broken blocks on the plane, the east block only develops the recent librarian pottery group exploration storage unit, and the west block develops the recent librarian pottery group, the ancient-system eastern-style group and the sand river street group. The method for rapidly evaluating the ascertained reserve quality of the oil field by adopting the method has the advantages that the reserve quality difference of the ascertained reserve units of different strata series and different fault blocks is large, and the ascertained reserve quality of the oil field is rapidly evaluated by adopting the method aiming at the area, and the method comprises the following steps:
a, collecting data of the formation crude oil viscosity, the reservoir permeability and the reserve scale of a confirmed reserve unit in an oil field A to be evaluated;
b, establishing a rectangular coordinate graph in Excel, wherein the abscissa axis of the rectangular coordinate graph is the viscosity of the crude oil in the stratum, and the ordinate of the rectangular coordinate graph is the permeability of the reservoir;
c as shown in fig. 1, the abscissa axis is set to a logarithmic coordinate, the minimum value is set to 1, the maximum value is set to 20000, the ordinate axis is set to a logarithmic coordinate, the minimum value is set to 0.01, and the maximum value is set to 20000;
d, creating 4 rectangular coordinate graphs with the same length and width in Excel, and specifically comprising the following steps:
d1) the abscissa axis of the first graph is set to a logarithmic scale axis with a reference of 10, a negative order scale, and a main unit of 10000, and the coordinate value intersecting with the ordinate axis is 1, the ordinate axis is set to a logarithmic scale axis with a reference of 10, and a main unit of 1000, and the coordinate value intersecting with the abscissa axis is 0.01;
d2) the abscissa axis of the second graph is set to a logarithmic scale axis with a reference of 10, a negative-order scale and a main unit of 50, and the coordinate value intersecting with the ordinate axis is 1, the ordinate axis is set to a logarithmic scale axis with a reference of 50 and a main unit of 5000, and the coordinate value intersecting with the abscissa axis is 0.01;
d3) the abscissa axis of the third graph is set to a logarithmic scale axis with a reference of 10, a negative-order scale and a main unit of 50, and the coordinate value intersecting with the ordinate axis is 1, the ordinate axis is set to a logarithmic scale axis with a reference of 50 and a main unit of 1000, and the coordinate value intersecting with the abscissa axis is 0.01;
d4) the abscissa axis of the fourth graph is set to a logarithmic scale axis with a reference of 10, a negative order scale, a main unit of 350, and a coordinate value crossing the ordinate axis is 1, the ordinate axis is set to a logarithmic scale axis with a reference of 50, a main unit of 50000, and a coordinate value crossing the abscissa axis is 0.01,
d5) superposing the four graphs in the steps d1) to d4) in the Excel to obtain a graph model;
making auxiliary thickened solid lines parallel to the ordinate axis and auxiliary dotted lines parallel to the abscissa axis and the abscissa axis at positions where the viscosity of the formation crude oil is 350 and the permeability of the reservoir is 10 respectively, and making auxiliary dotted lines parallel to the ordinate axis and the abscissa axis at positions where the viscosity of the formation crude oil is 50 and the permeability of the reservoir is 50;
e) as shown in fig. 2, the formation crude oil viscosity and the reservoir permeability of the ascertained reserves of the a oil field to be evaluated are counted in Excel, and the viscosity and the reservoir permeability are put into a rectangular coordinate diagram in the form of round scatter points according to the series of the western style of the a oil field, the eastern style of the western style of librarian, the eastern style of librarian and the sand street, and are distinguished by different frame and filling combination styles. The graph shows that the formation crude oil viscosity of the exploration reserve units of the Dongyou and Dongyou groups is 50-350 mPa.s, the reservoir permeability is more than 50mD, the unit belongs to a medium-high-permeability common thick oil exploration reserve unit, the formation crude oil viscosity of the exploration reserve units of the West Liangyuou group is more than 2500mPa.s, the reservoir permeability is more than 500mD, the unit belongs to a high-permeability and extra-high-viscosity oil exploration reserve unit, the formation crude oil viscosity of the exploration reserve units of the Sanhekyou group is less than 50mPa.s, the reservoir permeability is less than 50mD, and the unit belongs to a low-permeability and conventional oil exploration reserve unit.
As shown in fig. 3, in Excel, the ascertained reserve scale of the ascertained reserve units in the a oil field is counted, the type of the rectangular coordinate graph is set as a "bubble graph", the area of each circular scatter point is set as the reserve scale of each ascertained reserve unit in the a oil field, and the scaling ratio is set to 50% according to the requirement of the aesthetic measure of the graphic display. The graphic display, the great visiting reserves unit of reserves scale is mainly located west piece library pottery group, secondly is east piece library pottery group and Dongying group, is the sand river street group at last, consequently, synthesize three parameter judgement, and the visiting reserves quality in A oil field can be divided into three types, and the visiting reserves unit that the reserves quality is optimum mainly is located east piece library pottery group and Dongying group, and the visiting reserves unit that the reserves quality is the worst is located sand river street group.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for establishing a chart for rapidly evaluating the quality of an oilfield ascertained reserve is characterized by comprising the following steps:
a, collecting data of the formation crude oil viscosity, the reservoir permeability and the reserve scale of a confirmed reserve unit in an oil field to be evaluated;
b, establishing a rectangular coordinate graph, wherein the viscosity of the crude oil of the stratum is taken as an abscissa, and the permeability of the reservoir is taken as an ordinate;
c, setting the horizontal and vertical coordinate axes in the step b as logarithmic coordinate axes respectively to obtain logarithmic horizontal and vertical coordinate axes;
d, taking different horizontal and vertical coordinate values on the logarithmic horizontal and vertical coordinate axes, and setting different auxiliary line marks to obtain an intersection graph model;
e, counting the formation crude oil viscosity, the reservoir permeability and the reserve scale of the confirmed reserve unit in the oil field to be evaluated in the step a as parameters reflecting the quality of the confirmed reserve, putting the parameters into the cross-plot model in the form of circular scatter points, and judging the reserve quality of different plane blocks or longitudinal horizons.
2. The establishing method according to claim 1, wherein the step c comprises the following specific steps:
the abscissa axis is set as a logarithmic axis, the minimum value is set to 1, the maximum value is set to 20000, the ordinate axis is set as a logarithmic axis, the minimum value is set to 0.01, and the maximum value is set to 20000.
3. The establishing method according to claim 2, wherein the step d comprises the following specific steps:
marking the positions of the formation crude oil with the viscosity of 50 and 350 on the abscissa axis, marking the positions of the reservoir permeability of 10, 50 and 500 on the ordinate axis, respectively making auxiliary solid lines parallel to the ordinate axis and the abscissa axis at the positions of the formation crude oil with the viscosity of 350 and the reservoir permeability of 10, and respectively making auxiliary dotted lines parallel to the ordinate axis and the abscissa axis at the positions of the formation crude oil with the viscosity of 50 and the reservoir permeability of 50; different marks are arranged on the abscissa axis and the ordinate axis.
4. The establishing method according to claim 3, wherein the step d further comprises the following specific steps:
d1) creating four rectangular coordinate graphs with the same length and width in Excel, setting the abscissa axis of the first graph as a logarithmic scale axis with the reference of 10, reverse-order scale and main unit of 10000, and setting the coordinate value crossed with the ordinate axis as 1; the ordinate axis is set as a logarithmic scale axis with the reference of 10 and the main unit of 1000, and the coordinate value crossed with the abscissa axis is 0.01;
d2) the abscissa axis of the second graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale, and a main unit of 50, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with the reference of 50 and the main unit of 5000, and the coordinate value crossed with the abscissa axis is 0.01;
d3) the abscissa axis of the third graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale, and a main unit of 50, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with a reference of 50 and a main unit of 1000, and a coordinate value intersecting the abscissa axis is 0.01;
d4) the abscissa axis of the fourth graph is set as a logarithmic scale axis with a reference of 10, a reverse order scale and a main unit of 350, and a coordinate value intersecting the ordinate axis is 1; the ordinate axis is set as a logarithmic scale axis with the reference of 50 and the main unit of 50000, and the coordinate value crossed with the abscissa axis is 0.01;
d5) the four graphs in the steps d1) to d4) are overlapped in the middle of Excel to obtain a cross-graph model.
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