An evaluation method based on a three-parameter evaluation chart of a shale oil and gas reservoir

Abstract

The present application relates to unconventional oil and gas reservoir evaluation technical field, specifically to a kind of evaluation method based on shale oil and gas reservoir three parameter evaluation chart.The method is to obtain regional shale oil and gas exploration discovery well data, including well logging, logging, gas testing data;Establish target layer regional evaluation standard, draw TOC-BI-POR three parameter evaluation chart;Get to be evaluated well shale section and interpretation parameter;Project the interpretation parameter of the shale section of the well to be evaluated to the target layer regional TOC-BI-POR three parameter evaluation chart;According to TOC-BI-POR three parameter evaluation chart interpretation reservoir classification;Output evaluation result.Characterizes shale original quality, reservoir performance, compressibility, can realize the purpose of quickly and accurately evaluating marine, terrestrial shale oil and gas reservoir, provides basis for horizontal well to pass through target window optimization, reduces exploration and development cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unconventional oil and gas reservoir evaluation, and particularly relates to an evaluation method based on a three-parameter evaluation chart of shale oil and gas reservoirs. BACKGROUND

[0002] It is proved by domestic shale gas exploration and development practice that there are many evaluation parameters for shale reservoirs, and factors such as the original quality, reservoir performance and compressibility of shale reservoirs are the most direct key factors determining the yield of shale oil and gas wells. It is of great value to quickly evaluate the advantages and disadvantages of shale oil and gas reservoirs during drilling to guide horizontal well drilling and efficient development of shale oil and gas resources.

[0003] The Jurassic system in Sichuan Basin is an important continental shale exploration layer system, and multiple sets of shale layers containing both oil and gas are developed. Compared with the marine shale of the Longmaxi Formation of the Silurian system in the basin, the continental shale reservoirs show certain differences in indexes such as the original quality, reservoir performance and compressibility, which are specifically shown as follows: the organic matter content and quartz content of the continental organic-rich shale are relatively low, the reservoir conditions are mainly inorganic pores, and the geological evaluation index and the compressibility evaluation index show a weak negative correlation. This difference leads to the contradiction between the geological sweet spot and the engineering sweet spot of the continental shale, and therefore, the evaluation method established for the marine shale reservoirs is not completely applicable to the evaluation of the continental shale reservoirs. How to consider the geological evaluation index and the compressibility evaluation index and find the reasonable matching of the geological and engineering evaluation indexes to optimally select the geological and engineering double-sweet spots has become a difficult problem to be solved in the evaluation of the continental shale oil and gas reservoirs.

[0004] It is proved in practice that the total organic carbon content, total porosity and brittleness index are three important evaluation parameters of shale reservoirs, and the three parameters represent the oil and gas content, reservoir performance and compressibility of the shale reservoirs. At present, there are many two-parameter crossplot evaluation charts based on the total porosity and total organic carbon content. Since the considered factors are not comprehensive enough, the existing evaluation models and methods have certain deficiencies, and there is a lack of multi-parameter evaluation crossplot interpretation chart method based on the shale quality, reservoir performance and compressibility, especially in the evaluation of the continental shale oil and gas reservoirs. SUMMARY

[0005] The present application aims at the defects of the prior art, and provides an evaluation method based on a three-parameter evaluation chart of shale oil and gas reservoirs. By establishing a three-parameter evaluation chart of shale oil and gas reservoirs based on the total organic carbon content TOC, brittleness index BI and total porosity POR, the original quality, reservoir performance and compressibility of the shale are represented, and the purpose of quickly and accurately evaluating the marine and continental shale oil and gas reservoirs is achieved. The method provides a basis for the optimization of target window selection of horizontal wells, and reduces the exploration and development cost.

[0006] The evaluation method based on the three-parameter evaluation chart of shale oil and gas reservoirs provided by the present application comprises the following steps:

[0007] Obtaining shale oil and gas exploration well data in the area, including logging, mud logging, and gas testing data;

[0008] Establishing a target layer area evaluation standard and drawing a TOC-BI-POR three-parameter evaluation chart;

[0009] Obtaining shale layer sections and interpretation parameters of the well to be evaluated;

[0010] Projecting the interpretation parameters of the shale layer section of the well to be evaluated onto the TOC-BI-POR three-parameter evaluation chart of the target layer area;

[0011] Interpreting reservoir classification according to the TOC-BI-POR three-parameter evaluation chart;

[0012] Outputting the evaluation results.

[0013] More preferably, the shale oil and gas exploration well in the area is a well that has completed the gas testing task in the first stage of oil and gas field development; the logging and mud logging data include total organic carbon content TOC, brittleness index BI, and total porosity POR of the shale layer section; and the gas testing data include a gas testing well section L, a single-well initial maximum stable gas production Qgmax, and a single-well initial maximum stable oil production Ygmax.

[0014] More preferably, after obtaining the single-well initial maximum stable gas production Qgmax, it further includes converting the single-well initial maximum stable gas production into a single-well initial maximum stable oil and gas equivalent per 1000.0 m horizontal section according to the conversion relationship between natural gas and oil.

[0015] More preferably, the establishment of the target layer area evaluation standard and the drawing of the TOC-BI-POR three-parameter evaluation chart include:

[0016] Establishing a target layer area evaluation standard according to the logging and mud logging data of the shale oil and gas exploration well in the area;

[0017] Performing reservoir classification, including marking different classifications on the TOC-BI-POR three-parameter evaluation chart with different symbols, wherein a shale layer section includes two data points of TOC and BI and TOC and POR;

[0018] Shale reservoir classification area division, including shale reservoir classification area division of TOC and BI and TOC and POR sample data points in each classification shale reservoir;

[0019] Drawing the determined shale reservoir classification division standard onto the TOC-BI-POR chart.

[0020] More preferably, the well logging and mud logging data of the discovery well of the regional shale oil and gas exploration are used to establish the target layer regional evaluation standard, which includes:

[0021] The total organic carbon content TOC is used as the horizontal coordinate axis X, the brittleness index BI is used as the main vertical coordinate axis Y1, and the total porosity POR is used as the secondary vertical coordinate axis Y2 to form a TOC-BI-POR three-parameter evaluation chart.

[0022] The TOC, BI, and POR coordinate axes are scaled with one decimal place. The shale layer sample data of the regional shale oil and gas exploration discovery well is not less than 3 wells and 20 shale layers.

[0023] More preferably, the reservoir classification includes:

[0024] If the shale reservoir horizontal well fracturing test gas meets the requirement of single-well initial highest stable oil and gas equivalent / km≥20.0t / d, the shale reservoir is classified as Class I.

[0025] If the shale reservoir horizontal well fracturing test gas meets the requirement of 10.0t / d≤single-well initial highest stable oil and gas equivalent / km<20.0t / d, the shale reservoir is classified as Class II.

[0026] If the shale reservoir horizontal well fracturing test gas meets the requirement of 2.0t / d≤single-well initial highest stable oil and gas equivalent / km<10.0t / d, the shale reservoir is classified as Class III.

[0027] If the shale reservoir horizontal well fracturing test gas has no productivity, the shale reservoir is classified as non-effective shale layer.

[0028] More preferably, the shale layer section and interpretation parameters of the well to be evaluated are obtained, which includes:

[0029] The total organic carbon content TOC, brittleness index BI, total porosity POR, gas logging total hydrocarbon content Ct, and methane content C1 of the shale layer section of the well to be evaluated are obtained.

[0030] When the well logging and mud logging reservoir well section division is consistent, the well logging interpreted well section is directly selected as the shale layer section.

[0031] When the well logging and mud logging reservoir well section division is inconsistent, the well section with obvious abnormality in shale lithology, gas logging total hydrocarbon content Ct, and methane content C1 is selected as the shale layer section.

[0032] More preferably, when the well logging interpreted well section is selected as the shale layer section, it further includes:

[0033] The total organic carbon content TOC of the well to be evaluated is selected as the arithmetic mean of the geochemical logging measurement results.

[0034] The brittleness index BI is selected as the arithmetic mean of the calculation results of the element mineral components measured in the element logging.

[0035] The total porosity POR is selected as the arithmetic mean value of the logging data;

[0036] Wherein, a group of data is selected for each section.

[0037] More preferably, the projecting the interpreted parameters of the shale section of the well to be evaluated into the target layer area TOC-BI-POR three-parameter evaluation chart includes:

[0038] The TOC and BI, TOC and POR values of the shale section of the well to be evaluated are respectively projected into the TOC-BI-POR three-parameter evaluation chart.

[0039] On the TOC-BI-POR three-parameter evaluation chart, the data intersection points of TOC and BI, and the data intersection points of TOC and POR of the shale section of the well to be evaluated are respectively indicated by different symbols.

[0040] More preferably, the reservoir grading according to the TOC-BI-POR three-parameter evaluation chart includes:

[0041] On the TOC-BI-POR three-parameter evaluation chart, the reservoir grading of the area where the data points of the shale section of the well to be evaluated are located is interpreted according to the reservoir grading interpretation method.

[0042] The beneficial effects of the present application are:

[0043] The TOC-BI-POR three-parameter intersection evaluation chart established based on the total organic carbon content TOC, the brittleness index BI and the total porosity POR is intuitive and simple, and the evaluation result is reliable. The total organic carbon content TOC, the brittleness index BI and the total porosity POR are comprehensively considered to represent the original quality, the reservoir performance and the compressibility of the shale. The three evaluation indexes fully exploit the representation value of the geological parameters and the engineering parameters, and can realize the purpose of quickly and accurately evaluating the marine and terrestrial shale oil and gas reservoirs. The method provides a basis for the target window selection of the horizontal well, and reduces the exploration and development cost. The method solves the problems of low accuracy and poor reliability of the conventional evaluation method in the evaluation of the terrestrial shale oil and gas. In addition, the evaluation parameters involved in the TOC-BI-POR three-parameter intersection evaluation chart are easy to obtain, the chart is simple to make, and is suitable for the needs of the rapid and fine evaluation of the domestic terrestrial and marine shale gas and other unconventional reservoirs, and is easy to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 The figure is a method flowchart of the present application;

[0045] Figure 2 The figure is a three-parameter evaluation chart style diagram of the terrestrial shale oil and gas reservoir of the FX block of the Fuling gas field in Sichuan Basin. DETAILED DESCRIPTION

[0046] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, and are not intended to limit the present application.

[0047] It should be understood that when used in the specification and the appended claims of the present application, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0048] It should also be understood that the term "and / or" as used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0049] As used in the specification and the appended claims of the present application, the term "if" can be interpreted as "when" or "upon" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0050] In addition, in the description of the specification and the appended claims of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0051] In the present specification, the reference "one embodiment" or "some embodiments" and the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearance of the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in yet some embodiments", and the like in various places in the specification is not necessarily all referring to the same embodiment, but means "one or more but not all embodiments", unless otherwise specifically noted. The terms "comprise", "include", "have" and their conjugates mean "including but not limited to", unless otherwise specifically noted. "Multiple" means "two or more".

[0052] Embodiment one

[0053] Figure 1 The preferred embodiments of the present application are shown Figure 1A structural schematic diagram of an evaluation method based on a shale oil and gas reservoir three-parameter evaluation chart provided by the first embodiment of the application is shown. For ease of illustration, only parts related to the embodiment are shown, and are described in detail as follows.

[0054] Step 1, obtaining regional shale oil and gas exploration discovery well data (including logging, mud logging, and gas testing data);

[0055] (1) The regional shale oil and gas exploration discovery well refers to a well that has completed a gas testing task in the first stage of oil and gas field development;

[0056] (2) The logging and mud logging data include total organic carbon content (TOC), brittleness index (BI), and total porosity (POR) of the shale section, and the measurement units of TOC, POR, and BI are all %;

[0057] (3) The gas testing data include a gas testing well section (L), a single-well initial maximum stable gas production (Qgmax), and a single-well initial maximum stable oil production (Ygmax), and the measurement unit of L is m, the measurement unit of Qgmax is m 3 / d, and the measurement unit of Ygmax is t / d;

[0058] (4) The single-well initial maximum stable oil and gas equivalent of 1000.0 m 3 is calculated by converting the single-well initial maximum stable gas production into oil equivalent, and the measurement unit of the single-well initial maximum stable oil and gas equivalent is t / d.

[0059] Step 2, establishing a target layer regional evaluation standard and drawing a TOC-BI-POR three-parameter evaluation chart;

[0060] (1) Establishing a target layer regional evaluation standard according to the logging and mud logging data of the regional shale oil and gas exploration discovery well;

[0061] Taking total organic carbon content (TOC) as a horizontal coordinate axis (X), brittleness index (BI) as a main vertical coordinate axis (Y1), and total porosity (POR) as a secondary vertical coordinate axis (Y2), a TOC-BI-POR three-parameter evaluation chart is constructed; the coordinate axes of TOC, BI, and POR are all marked with one decimal place; the shale section sample data of the regional shale oil and gas exploration discovery well should be no less than 3 wells and 20 shale sections;

[0062] (2) Classifying reservoir levels; on the TOC-BI-POR three-parameter evaluation chart, different symbols are used to mark different levels, and one shale section includes two data points of TOC and BI and TOC and POR;

[0063] The shale reservoir grading principle: type I shale reservoir horizontal well fracturing test gas can obtain high yield, single well initial highest stable oil and gas equivalent / km≥20.0 t / d; type II shale reservoir horizontal well fracturing test gas can obtain medium yield, 10.0 t / d≤single well initial highest stable oil and gas equivalent / km<20.0 t / d; type III shale reservoir horizontal well fracturing test gas can obtain low yield, 2.0 t / d≤single well initial highest stable oil and gas equivalent / km<10.0 t / d; non-effective shale layer fracturing test gas has no productivity.

[0064] (3) Shale reservoir grading regional division: the regions where TOC and BI, TOC and POR sample data points of each graded shale reservoir are located are subjected to reservoir grading regional division;

[0065] Division principle: the region where 90.0% or more type I shale reservoir data points are located is type I shale reservoir region, the region where 90.0% or more type II shale reservoir data points are located is type II shale reservoir region, the region where 90.0% or more type III shale reservoir data points are located is type III shale reservoir region; the region below the lower limit of type III region is non-effective shale reservoir region;

[0066] On the TOC-BI-POR three-parameter evaluation chart, the data intersection points of TOC and BI of type I shale reservoir are represented by "■", the data intersection points of TOC and POR are represented by "□", the data intersection points of TOC and BI of type II shale reservoir are represented by "●", the data intersection points of TOC and POR are represented by "○", the data intersection points of TOC and BI of type III shale reservoir are represented by "◆", the data intersection points of TOC and POR are represented by "◇", and the data intersection points of TOC and BI of non-effective reservoir are represented by "▲", and the data intersection points of TOC and POR are represented by "△";

[0067] Taking the continental shale reservoirs of FX block of Fuling shale gas field in Sichuan Basin as an example, the TOC-BI-POR three-parameter evaluation chart of 43 shale sections of 3 wells (see Figure 2 ) shows that type I shale reservoir, TOC≧2.0%, BI≧40.0%, POR≧5.0%; type II shale reservoir, 1.0%≤TOC<2.0%, 35.0%≤BI<40.0%, 3.0%≤POR<5.0%; type III shale reservoir, 0.5%≤TOC<1.0%, 30.0%≤BI<35.0%, 2.0%≤POR<3.0%; non-effective shale reservoir, TOC<0.5%, BI<30.0%, POR<2.0%;

[0068] (4) The determined shale reservoir grading standards are plotted on the TOC-BI-POR chart, and the four grades of TOC are represented by three vertical solid lines, the four grades of BI are represented by three horizontal solid lines, and the four grades of POR are represented by three horizontal dashed lines;

[0069] Step 3, obtaining the shale section of the well to be evaluated and the interpretation parameters (including TOC-BI-POR);

[0070] (1) The total organic carbon content (TOC), brittleness index (BI), total porosity (POR), gas logging total hydrocarbon content (Ct), and methane content (C1) of the shale section of the well to be evaluated are obtained, and the measurement units of TOC, POR, BI, Ct, and C1 are all %;

[0071] (2) When the well logging and well logging reservoir section division is consistent, the well logging interpreted section is directly selected as the shale section; the total organic carbon content (TOC) of the well to be evaluated is selected as the arithmetic mean of the measurement results of the geochemical logging, the brittleness index (BI) is selected as the arithmetic mean of the calculation results of the element mineral components measured in the element logging, and the total porosity (POR) is selected as the arithmetic mean of the logging data, and a group of data is selected for each section.

[0072] (3) When the well logging and well logging reservoir section division is inconsistent, the section with obvious abnormality in the shale section is selected as the shale section.

[0073] Step 4, projecting the interpretation parameters of the shale section of the well to be evaluated to the target layer area TOC-BI-POR three-parameter evaluation chart;

[0074] (1) The TOC and BI, TOC and POR values of the shale section of the well to be evaluated are respectively plotted on the TOC-BI-POR three-parameter evaluation chart plotted in step 2);

[0075] (2) On the TOC-BI-POR three-parameter evaluation chart, the intersection point of the TOC and BI data of the shale section of the well to be evaluated is represented by “★”, and the intersection point of the TOC and POR data is represented by “☆”;

[0076] Step 5, interpreting the reservoir grading according to the TOC-BI-POR three-parameter evaluation chart;

[0077] On the plotted TOC-BI-POR three-parameter evaluation chart, the reservoir grading of the area where the data points of the shale section of the well to be evaluated are located is interpreted according to the reservoir grading interpretation method;

[0078] The interpretation method of the first type of shale reservoir, the data points of TOC and BI, and the intersection points of TOC and POR of the shale section of the well to be evaluated fall in the first type of shale reservoir area respectively.

[0079] The II type shale reservoir interpretation method is explained in two cases, one is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the I type shale reservoir region and the region below the I type shale reservoir region divided respectively, and the other is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the II type shale reservoir region divided respectively.

[0080] The III type shale reservoir interpretation method is explained in two cases, one is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the II type shale reservoir region and the region below the II type shale reservoir region divided respectively, and the other is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the III type shale reservoir region divided respectively.

[0081] The non-effective reservoir interpretation method is explained in two cases, one is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the III type shale reservoir region and the non-effective shale reservoir region divided respectively, and the other is that the data intersection points of TOC and BI and TOC and POR of the shale section of the well to be evaluated fall in the non-effective shale reservoir region divided respectively.

[0082] Step 6, output evaluation results.

[0083] According to the user's requirements, the evaluation results are output, and the contents include shale section, TOC, BI, POR, interpretation conclusion.

[0084] The present application has been applied in the fine evaluation of marine and terrestrial shale oil and gas reservoirs in Fuling gas field in Sichuan Basin, and has guided the selection of more than 110 horizontal wells for sidetracking, and the average rate of horizontal section in the I type shale section is 90.0%, and high production is obtained through large-scale fracturing test gas, among which the highest stable oil and gas equivalent in the initial test gas of terrestrial shale A well reaches 47.9t / d / km, and the highest stable oil and gas equivalent in the initial test gas of marine shale gas B well exceeds 50.0t / d / km, which meets the needs of fine interpretation and evaluation of logging shale reservoir and engineering service, and has good popularization and application value.

[0085] It should be understood that the specific order or hierarchy of steps in the disclosed processes should be considered exemplary. Based on design preference, it should be understood that the specific order or hierarchy of steps in the processes can be rearranged without departing from the scope of protection of the present disclosure. The appended method claims recite the elements of the various steps in the exemplary order presented, and are not intended to be limited to the specific order or hierarchy presented.

[0086] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for evaluating shale oil and gas reservoirs based on a three-parameter evaluation chart, characterized in that: Comprising obtaining shale oil and gas exploration well data in a region, including well logging, mud logging, and gas testing data; establishing a target layer region evaluation standard and drawing a TOC-BI-POR three-parameter evaluation chart; obtaining shale layer sections and interpretation parameters of the well to be evaluated; projecting the interpretation parameters of the shale layer section of the well to be evaluated to the TOC-BI-POR three-parameter evaluation chart of the target layer region; interpreting reservoir classification according to the TOC-BI-POR three-parameter evaluation chart; outputting the evaluation results; the establishment of the target layer region evaluation standard and the drawing of the TOC-BI-POR three-parameter evaluation chart include: establishing a target layer region evaluation standard according to well logging and mud logging data of shale oil and gas exploration wells in the region; performing reservoir classification, including marking different classifications on the TOC-BI-POR three-parameter evaluation chart with different symbols, wherein a shale layer section includes two data points of TOC and BI and TOC and POR; shale reservoir classification region division, including shale reservoir classification region division of TOC and BI and TOC and POR sample data points in each classification; drawing the determined shale reservoir classification division standard to the TOC-BI-POR chart; the establishment of the target layer region evaluation standard according to well logging and mud logging data of shale oil and gas exploration wells in the region includes: taking total organic carbon content TOC as the horizontal coordinate axis X, brittle index BI as the main vertical coordinate axis Y1, and total porosity POR as the secondary vertical coordinate axis Y2 to form a TOC-BI-POR three-parameter evaluation chart; wherein the TOC, BI, and POR coordinate axes are scaled to one decimal place; the shale layer section sample data of the shale oil and gas exploration well in the region is not less than 3 wells and 20 shale layer sections; the reservoir classification includes: if the shale reservoir horizontal well fracturing gas testing meets single well initial highest stable oil and gas equivalent / km≥20.0 t / d, the classification is type I shale reservoir; if the shale reservoir horizontal well fracturing gas testing meets 10.0 t / d≤single well initial highest stable oil and gas equivalent / km<20.0 t / d, the classification is type II shale reservoir; if the shale reservoir horizontal well fracturing gas testing meets 2.0 t / d≤single well initial highest stable oil and gas equivalent / km<10.0 t / d, the classification is type III shale reservoir; if the shale reservoir horizontal well fracturing gas testing has no productivity, the classification is non-effective shale layer.

2. The method according to claim 1, wherein the method is based on a three-parameter evaluation chart for shale oil and gas reservoirs. the shale oil and gas exploration well in the region is a well that has completed the gas testing task in the first stage of oil and gas field development; the well logging and mud logging data include total organic carbon content TOC, brittle index BI, and total porosity POR of the shale layer section; and the gas testing data include gas testing well section L, single well initial highest stable gas production Qgmax, and single well initial highest stable oil production Ygmax.

3. The method according to claim 2, wherein the method is based on a three-parameter evaluation chart for shale oil and gas reservoirs. after obtaining the single well initial highest stable gas production Qgmax, it further includes converting the single well initial highest stable gas production into single well initial highest stable oil and gas equivalent per 1000.0 m horizontal section according to the conversion relationship between natural gas and oil.

4. The method for shale oil and gas reservoir three-parameter evaluation chart evaluation according to claim 1, characterized in that, the obtaining of the shale layer sections and interpretation parameters of the well to be evaluated includes: Obtaining total organic carbon content TOC, brittleness index BI, total porosity POR, gas logging total hydrocarbon content Ct, and methane content C1 of a shale section of an evaluation well; When the well logging and mud logging reservoir interval division is consistent, directly selecting the well logging interpreted interval as the shale section; When the well logging and mud logging reservoir interval division is inconsistent, selecting an interval with shale lithology, obvious abnormal gas logging total hydrocarbon content Ct, and methane content C1 as the shale section.

5. The method for shale oil and gas reservoir three-parameter evaluation chart evaluation according to claim 4, characterized in that, When the well logging interpreted interval is selected as the shale section, further comprising: The total organic carbon content TOC of the evaluation well is selected as the arithmetic mean of the geochemical logging measurement results; The brittleness index BI is selected as the arithmetic mean of the element mineral component calculation results measured in the element logging; The total porosity POR is selected as the arithmetic mean of the well logging data; Each interval selects a group of data.

6. The method for shale oil and gas reservoir three-parameter evaluation chart evaluation according to claim 1, characterized in that, The projection of the interpreted parameters of the shale section of the evaluation well to the target layer area TOC-BI-POR three-parameter evaluation chart includes: The TOC and BI, and the TOC and POR values of the shale section of the evaluation well are respectively projected onto the drawn TOC-BI-POR three-parameter evaluation chart; On the TOC-BI-POR three-parameter evaluation chart, the intersection points of the TOC and BI data and the intersection points of the TOC and POR data of the shale section of the evaluation well are respectively represented by different symbols.

7. The method for shale oil and gas reservoir three-parameter evaluation chart evaluation according to claim 1, characterized in that, The reservoir classification according to the TOC-BI-POR three-parameter evaluation chart includes: On the drawn TOC-BI-POR three-parameter evaluation chart, the reservoir classification of the region where the data points of the shale section of the evaluation well are located is interpreted according to the reservoir classification interpretation method.

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