Evaluation method for water-flooded zones based on rock pyrolysis gas chromatography technology

Abstract

The present invention relates to the field of reservoir evaluation technology, and is a water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology, comprising: 14 to nC 30 The corresponding peak area is used as a sensitive parameter for changes in waterlogging severity. The total peak area of the crude oil sample and the total peak area of the rock cuttings sample to be tested are calculated using this sensitive parameter, and then a waterlogging index is calculated. Based on the waterlogging index evaluation standard, the reservoir waterlogging severity is identified according to the waterlogging index. The present invention compares the waterlogging index with the waterlogging severity interpreted by the oil test to establish a waterlogging index evaluation standard. For reservoirs with unknown waterlogging severity, the waterlogging severity can be determined by calculating the waterlogging index and comparing it to the waterlogging index evaluation standard. This method also avoids the drawbacks of directly qualitatively identifying waterlogging severity based on the characteristics of rock pyrolysis gas chromatography spectra, and has excellent practical value and promotion prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir evaluation, and is a water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology. The invention also includes a water-flooded layer evaluation device based on rock pyrolysis gas chromatography technology, electronic equipment and storage medium. Background Art

[0002] During the oil production process, as water injection continues, a large number of oil reservoirs are flooded. The identification and evaluation of water-flooded layers have become a key step in improving oil reservoir recovery and optimizing subsequent production plans.

[0003] Traditional methods for evaluating water-flooded layers have numerous limitations. For example, resistivity logging can significantly reduce the accuracy of identifying water-flooded layers when the formation water salinity changes or unusual lithology is present. This is because the pattern of change in formation resistivity after flooding becomes complex and diverse, no longer simply linearly related to the degree of flooding.

[0004] Conventional gas chromatography analysis technology can provide certain information in the evaluation of water-flooded layers. However, for complex oil and gas reservoirs, especially those with multiple stages of oil and gas injection and multiple types of water flooding, it is difficult to accurately analyze the subtle effects of different water flooding stages and different fluid properties on the hydrocarbon components in the rock, resulting in large errors in the evaluation results.

[0005] Rock pyrolysis gas chromatography (GGC) can overcome some of these limitations. By analyzing rock samples using GGC, it can obtain rich information about hydrocarbon compounds in the rock, such as the content and distribution characteristics of hydrocarbons of different carbon numbers. This information is closely related to the waterlogging condition of the reservoir. Waterlogging can cause hydrocarbons in the rock pores to be washed out or biodegraded, resulting in changes in peak shape, peak height, and peak area ratio on the GGC spectrum. However, a systematic, comprehensive, and widely applicable evaluation method for waterlogged layers based on GGC has not yet been established. Further research and development is needed to achieve more accurate and efficient evaluation of waterlogged layers and provide reliable technical support and decision-making for oil exploration and development. With the rapid development of waterlogged reservoirs, the accurate identification of waterlogged layers is becoming increasingly important, requiring more precise and detailed evaluation methods.

[0006] Patent document CN112858369A discloses a method for rapidly identifying favorable shale oil intervals based on rock pyrolysis parameters, comprising: obtaining shale samples from a shale formation, performing rock pyrolysis analysis and total organic carbon determination; obtaining a first organic geochemical parameter of the shale formation using the rock pyrolysis analysis method; determining the organic matter maturity and type of the shale sample based on the maximum pyrolysis peak temperature and a plot of the maximum pyrolysis peak temperature and hydrogen index; calculating the hydrocarbon expulsion rate; classifying the shale into three types: E-type, M-type, and R-type based on the hydrocarbon expulsion rate per unit mass of the low-maturity to mature sample; and determining favorable shale oil intervals based on analysis and description of the different shale types. This invention establishes a new indicator for characterizing shale hydrocarbon expulsion rate, enabling prediction of shale oil content and thereby identifying favorable intervals for shale oil exploration.

[0007] Zuo Tieqiu (Zuo Tieqiu et al., Method for evaluating water-flooded layers using rock pyrolysis analysis technology [J]. Mud Logging Engineering, 2005, Vol. 16, No. 3) obtained parameters such as the current remaining oil saturation and oil displacement efficiency through pyrolysis analysis of wellbore core sampling, and made a detailed evaluation of the vertical water-flooding status of the reservoir. By calculating the reservoir water production rate, the degree of water-flooding in the oil layer was comprehensively judged, thereby improving the efficiency of adjustment and potential tapping in old oil fields. This provided a reliable basis for further developing oil stabilization and water control technologies and deepening fine geological research.

[0008] During the oil production process, accurately judging the waterlogging status of the reservoir is extremely critical for predicting the remaining oil distribution, monitoring the reservoir dynamics, and improving crude oil recovery. This technology aims to provide effective technical means and solutions for this purpose. Summary of the Invention

[0009] The present invention provides a water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology, which overcomes the shortcomings of the above-mentioned prior art. In the rock pyrolysis gas chromatography spectrum, nC 14 to nC 30 The corresponding peak area is used as a sensitive parameter for changes in flooding degree, and the flooding index is calculated. Based on the flooding index, the reservoir flooding degree is determined.

[0010] The technical solution of the present invention is achieved through the following measures: a water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology, comprising:

[0011] Obtain rock pyrolysis gas chromatogram and analysis data of crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ;

[0012] Obtain the rock pyrolysis gas chromatogram and analysis data of the rock cuttings sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock cuttings sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ;

[0013] Based on the total peak area ∑ of the crude oil sample 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index;

[0014] Based on the flooding index evaluation standard, the reservoir flooding degree is identified according to the flooding index.

[0015] The following are further optimizations and / or improvements to the above technical solutions:

[0016] The above flooding index is calculated as follows:

[0017]

[0018] Where Q sy represents the flooding index; ∑ 原油 represents the total peak area of crude oil sample; ∑ 测样 Represents the total peak area of the rock cuttings sample to be tested.

[0019] The total peak area of the above crude oil samples ∑ 原油 Calculate as follows:

[0020]

[0021] Where, ∑ 原油 Represents the total peak area of crude oil; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0022] The total peak area of the above-mentioned rock cuttings sample is ∑ 测样 Calculate as follows:

[0023]

[0024] Where, ∑ 测样 Indicates the total peak area of the sample to be measured; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0025] The above flooding index evaluation criteria are as follows:

[0026] Not flooded: Q sy ≥-0.10;

[0027] Weak flooding layer: -0.10>Q sy ≥-0.25;

[0028] Weak-medium flooded layer: -0.25>Q sy ≥-0.40;

[0029] Medium flooded layer: -0.40>Q sy ≥-0.55;

[0030] Medium to strong flooding layer: -0.55>Q sy ≥-0.70;

[0031] Strong flooding layer: -0.70>Q sy >-0.90;

[0032] Water layer: Q sy ≤-0.90;

[0033] Among them, the Q sy Indicates the flooding index.

[0034] The second technical solution of the present invention is achieved by the following measures: a water-flooded layer evaluation device based on rock pyrolysis gas chromatography technology, comprising:

[0035] Crude oil total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ;

[0036] The rock chip total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the rock chip sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock chip sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ;

[0037] Flooding index calculation module: based on the total peak area ∑ of crude oil samples 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index;

[0038] Water flooding degree identification module: Based on the water flooding index evaluation standard, the water flooding degree of the reservoir is identified according to the water flooding index.

[0039] The third technical solution of the present invention is achieved through the following measures: an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in one of the technical solutions.

[0040] The fourth technical solution of the present invention is achieved through the following measures: a storage medium, on which a computer program that can be read by a computer is stored, and the computer program is configured to execute the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in one of the technical solutions when it is run.

[0041] In the rock pyrolysis gas chromatogram of the present invention, nC 14 to nC 30 The corresponding peak area is used as a sensitive parameter for changes in waterlogging severity, and a waterlogging index is calculated. This index is then compared with the waterlogging severity interpreted from oil testing to establish a waterlogging index evaluation standard. For reservoirs with unknown waterlogging severity, the calculated index can be used to determine the reservoir's waterlogging severity by comparing it to the waterlogging index evaluation standard. This method also avoids the drawbacks of directly qualitatively identifying waterlogging severity based on the characteristics of rock pyrolysis gas chromatography spectra, demonstrating its potential for practical application and widespread adoption. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Attachment Figure 1 It is a schematic diagram of the process of the present invention;

[0043] Attachment Figure 2 This is an example of a gas chromatogram of rock pyrolysis;

[0044] Attachment Figure 3 This is a line graph showing changes in the gas chromatograms of rock pyrolysis of the experimental samples (samples 1 to 6) of the present invention;

[0045] Attachment Figure 4 This is a line graph showing changes in the gas chromatography spectrum of rock pyrolysis in an application example of the present invention. DETAILED DESCRIPTION

[0046] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions. The percentages in the present invention, unless otherwise specified, are all weight percentages.

[0047] The present invention will be further described below in conjunction with the embodiments:

[0048] Example 1: The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology includes:

[0049] Obtain rock pyrolysis gas chromatogram and analysis data of crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ;

[0050] Obtain the rock pyrolysis gas chromatogram and analysis data of the rock cuttings sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock cuttings sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ;

[0051] Based on the total peak area ∑ of the crude oil sample 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index;

[0052] Based on the flooding index evaluation standard, the reservoir flooding degree is identified according to the flooding index.

[0053] An example of a rock pyrolysis gas chromatogram is shown in Figure 2 .

[0054] The rock pyrolysis gas chromatograms and analytical data of the crude oil sample and the rock chip sample to be tested were obtained by rock pyrolysis gas chromatography analysis respectively.

[0055] Example 2: As an optimization of the above example, the flooding index is calculated as follows:

[0056]

[0057] Where Q sy represents the flooding index; ∑ 原油 represents the total peak area of crude oil sample; ∑ 测样 Represents the total peak area of the rock cuttings sample to be tested.

[0058] The total peak area of the above crude oil samples ∑ 原油 Calculate as follows:

[0059]

[0060] Where, ∑ 原油 Represents the total peak area of crude oil; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0061] Example 3: As an optimization of the above example, the total peak area ∑ 测样 Calculate as follows:

[0062]

[0063] Where, ∑ 测样 Indicates the total peak area of the sample to be measured; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0064] Example 4: As an optimization of the above example, the flooding index evaluation criteria (see Table 1) are as follows:

[0065] Not flooded: Q sy ≥-0.10;

[0066] Weak flooding layer: -0.10>Q sy ≥-0.25;

[0067] Weak-medium flooded layer: -0.25>Q sy ≥-0.40;

[0068] Medium flooded layer: -0.40>Q sy ≥-0.55;

[0069] Medium to strong flooding layer: -0.55>Q sy ≥-0.70;

[0070] Strong flooding layer: -0.70>Q sy >-0.90;

[0071] Water layer: Q sy ≤-0.90;

[0072] Among them, the Q sy Indicates the flooding index.

[0073] Example 5: A water-flooded layer evaluation device based on rock pyrolysis gas chromatography technology, comprising:

[0074] Crude oil total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ;

[0075] The rock chip total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the rock chip sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock chip sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ;

[0076] Flooding index calculation module: based on the total peak area ∑ of crude oil samples 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index;

[0077] Water flooding degree identification module: Based on the water flooding index evaluation standard, the water flooding degree of the reservoir is identified according to the water flooding index.

[0078] Example 6: An electronic device includes a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in the above embodiment.

[0079] Example 7: A storage medium storing a computer program readable by a computer, wherein the computer program is configured to execute, when running, the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in the above embodiment.

[0080] In the present invention, Figure 1 As shown in Figure 2, the extraction of sensitive parameters includes the following steps:

[0081] Step 1: Sample preparation

[0082] a. Select a core sample with a porosity of 20% for the experiment and use a coring tool to drill a cylindrical sample with a diameter of 2.54 cm and a length of 12 cm.

[0083] b. Soak the drilled columnar sample in chloroform, an organic solvent, to dissolve the organic oil in the core sample, and then dry it in a drying oven at 110°C for no less than 24 hours;

[0084] c. Cut the dried columnar samples into cylindrical samples with a diameter of 2.54 cm and a length of 2 cm, and mark them as samples 1, 2, 3, 4, 5, and 6;

[0085] d. Use crude oil to inject the sample into the sample. The processing method is as follows:

[0086] (1) Sample No. 1 was injected with 100% crude oil;

[0087] (2) Sample No. 2 was injected with 80% crude oil + 20% aqueous solution;

[0088] (3) Sample No. 3 was injected with 60% crude oil + 40% aqueous solution;

[0089] (4) Sample No. 4 was injected with 50% crude oil + 50% aqueous solution;

[0090] (5) Sample No. 5 was injected with 40% crude oil + 60% aqueous solution;

[0091] (6) Sample No. 6 was injected with 20% crude oil + 80% aqueous solution;

[0092] The density of the injected crude oil is 0.85 g / cm 3 , the mineralization of the aqueous solution is 15000 mg / L.

[0093] Step 2: Sample analysis after injection treatment

[0094] a. Select sample No. 1 and conduct rock pyrolysis gas chromatography analysis (starting temperature 100°C, constant temperature 1 minute, then gradually increase the temperature by 8°C / min, increase the column box temperature to 300°C, and maintain the temperature for 15 minutes), and obtain the rock pyrolysis gas chromatogram and data points of sample No. 1;

[0095] b. Follow step 2a to obtain rock pyrolysis gas chromatograms and data points for samples 2 to 6;

[0096] The line graph of the changes in the rock pyrolysis gas chromatograms of samples 1 to 6 is shown in Figure 3 .

[0097] Step 3: Spectral analysis

[0098] a. The spectrum of sample No. 1 has a full peak shape and the carbon number range is nC 12 to nC 36 ,With different ratios of injected crude oil and aqueous solution, the ,spectral peak shape changed;

[0099] b. As the amount of injected crude oil gradually decreased and the amount of aqueous solution increased, the peaks of the spectra of samples 2 to 6 tended to be mountain-shaped and front-peak-shaped, and the carbon number range narrowed, with sample 6 shrinking the most.

[0100] c. Determine the carbon number range in nC by the spectrum 14 to nC 30 The peak area changes in the region are most obvious.

[0101] Step 4: Extract sensitive parameters

[0102] The peak area of rock pyrolysis gas chromatography is obtained by summing the different n-alkanes contents to obtain the final peak area, because the carbon number range of step 3c is nC 14 to nC 30The peak area change in the region is most obvious, so the nC 14 to nC 30 The corresponding peak area is used as a sensitive parameter for changes in flooding degree.

[0103] Step 5: Calculate the total peak area

[0104] Sample No. 1 is 100% crude oil (referred to as crude oil). The total peak area of Sample No. 1 is calculated as follows:

[0105]

[0106] Where, ∑ 原油 Represents the total peak area of crude oil; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0107] The total peak areas of samples 2 to 6 are calculated as follows:

[0108]

[0109] Where, ∑ 测样 Indicates the total peak area of the sample to be measured; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0110] Establishment of the flooding index evaluation standard: Calculate the flooding index using multiple crude oil samples and multiple rock chip samples from the same block, compare the flooding index with the flooding degree interpreted by the oil test, and establish the flooding index evaluation standard.

[0111] Application Example: The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology of the present invention is applied to the 100-21 well area of Xinjiang Oilfield, comprising the following steps:

[0112] (1) Selection of regional crude oil samples

[0113] The Karamay Formation (T2 k ) Crude oil samples were subjected to rock pyrolysis gas chromatography analysis. The density of the selected crude oil samples was 0.86 g / cm 3 .

[0114] The crude oil sample selected here is operated according to steps 1a and 2a, and the corresponding rock pyrolysis gas chromatogram and analysis data are obtained.

[0115] (2) Determine the total peak area of the crude oil sample

[0116] According to the total peak area ∑ 原油 The calculation formula is used to determine the total peak area ∑ of the crude oil sample. 原油 :

[0117]

[0118] Where, ∑ 原油 Represents the total peak area of crude oil; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0119] The calculation results show that:

[0120]

[0121] (3) Select the sample to be measured

[0122] The drilling cuttings samples from the BX1 well in the Karamay Formation in the Bai 21 well area were selected as the cuttings samples to be tested, and three sections (section 1: 2506.00m to 2508.00m, section 2: 2672.00m to 2674.00m, section 3: 2760m to 2762.00m) of the drilling cuttings samples were selected respectively.

[0123] The drilling cuttings sample selected here is operated according to step 2a to obtain the corresponding rock pyrolysis gas chromatogram and analysis data.

[0124] The crude oil samples after pyrolysis in the pyrolysis furnace and the drilling cuttings samples from the three sections of the BX1 well were analyzed by rock pyrolysis gas chromatography. The resulting rock pyrolysis gas chromatogram change line graph is shown in Figure 4 .

[0125] (4) Total peak area of the sample to be tested

[0126] The total peak area of the drilling cuttings sample ∑ 测样 (Table 2).

[0127]

[0128] Where, ∑ 测样 Indicates the total peak area of the sample to be measured; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14normal alkane peak height; Indicates the peak heights of different normal alkanes.

[0129] (5) Calculation of flooding index

[0130] The water flooding index of the drilling cuttings sample was calculated according to the following formula, and the water flooding degree was evaluated (Table 3).

[0131] The flood index calculation formula is:

[0132]

[0133] (6) Verification of oil test results

[0134] The results of the oil test in the three test sections of the BX1 well were verified. The section from 2506.00m to 2508.00m produced 4.5t of crude oil per day, with a water cut of 14.5%, indicating a weakly water-flooded layer; the section from 2672.00m to 2674.00m produced 3.7t of crude oil per day, with a water cut of 45.0%, indicating a moderately water-flooded layer; the section from 2760m to 2762.00m produced 0.05t of crude oil per day, with a water cut of 97.5%, indicating a water layer.

[0135] The oil test results are consistent with the flooding degree evaluated by the flooding index described in Table 3.

[0136] In summary, the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology formed by the present invention realizes the quantitative evaluation of water-flooding degree, and provides important data support for subsequent well logging and oil testing layer selection recommendations and interpretation conclusions.

[0137] The method described in this paper has been applied to water-flooded reservoirs in Xinjiang oil fields, providing a quantitative means of evaluating water-flooded layers. In practice, the water-flooding index is used to evaluate the degree of water-flooding, and the results of oil testing are verified. The water-flooding degree identification accuracy rate reaches over 90%, effectively improving the accuracy of water-flooded layer identification.

[0138] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0139] Table 1 Evaluation criteria for flooding index

[0140] .

[0141] Table 2 Total peak area of the rock cuttings samples to be tested

[0142] .

[0143] Table 3 Water flooding index and water flooding degree evaluation table of measurement well section

[0144] 。

Claims

1. A method for evaluating water-flooded layers based on rock pyrolysis gas chromatography technology, characterized in that: include: Obtain rock pyrolysis gas chromatogram and analysis data of crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ; Obtain the rock pyrolysis gas chromatogram and analysis data of the rock cuttings sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock cuttings sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ; Based on the total peak area ∑ of the crude oil sample 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index; Based on the flooding index evaluation standard, the reservoir flooding degree is identified according to the flooding index; The flood index is calculated as follows: Where Q sy represents the flooding index; ∑ 原油 represents the total peak area of crude oil sample; ∑ 测样 Represents the total peak area of the rock cuttings sample to be tested.

2. The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology according to claim 1 is characterized in that: Total peak area of crude oil sample∑ 原油 Calculate as follows: Where, ∑ 原油 Represents the total peak area of crude oil; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

3. The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology according to claim 1 or 2, characterized in that: The total peak area of the rock cuttings sample to be tested∑ 测样 Calculate as follows: Where, ∑ 测样 Indicates the total peak area of the sample to be measured; nC 30 Indicates nC 30 Normal alkane peak height; nC 14 Indicates nC 14 normal alkane peak height; Indicates the peak heights of different normal alkanes.

4. The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology according to claim 1 or 2, characterized in that: The flood index evaluation criteria are as follows: Not flooded: Q sy ≥-0.10; Weak flooding layer: -0.10>Q sy ≥-0.25; Weak-medium water brewing: -0.25>Q sy ≥-0.40; Medium flooded layer: -0.40>Q sy ≥-0.55; Medium to strong flooding layer: -0.55>Q sy ≥-0.70; Strong flooding layer: -0.70>Q sy >-0.90; Water layer: Q sy ≤-0.90; Among them, the Q sy Indicates the flooding index.

5. The water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology according to claim 3 is characterized in that: The flood index evaluation criteria are as follows: Not flooded: Q sy ≥-0.10; Weak flooding layer: -0.10>Q sy ≥-0.25; Weak-medium water brewing: -0.25>Q sy ≥-0.40; Medium flooded layer: -0.40>Q sy ≥-0.55; Medium to strong flooding layer: -0.55>Q sy ≥-0.70; Strong flooding layer: -0.70>Q sy >-0.90; Water layer: Q sy ≤-0.90; Among them, the Q sy Indicates the flooding index.

6. A water-flooded layer evaluation device based on rock pyrolysis gas chromatography technology, characterized in that: include: Crude oil total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the crude oil sample. In the rock pyrolysis gas chromatogram of the crude oil sample, nC 14 to nC 30 The corresponding peak area is the total peak area of the crude oil sample ∑ 原油 ; The rock chip total peak area calculation module: obtains the rock pyrolysis gas chromatogram and analysis data of the rock chip sample to be tested, which belongs to the same block as the crude oil sample. In the rock pyrolysis gas chromatogram of the rock chip sample to be tested, nC 14 to nC 30 The corresponding peak area is the total peak area of the rock cuttings sample to be tested ∑ 测样 ; Flooding index calculation module: based on the total peak area ∑ of crude oil samples 原油 and the total peak area of the rock cuttings sample to be tested∑ 测样 Calculate flooding index; Water flooding degree identification module: Based on the water flooding index evaluation standard, the water flooding degree of the reservoir is identified according to the water flooding index.

7. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores a computer program that can be read by a computer, and the computer program is configured to execute the water-flooded layer evaluation method based on rock pyrolysis gas chromatography technology as described in any one of claims 1 to 5 when running.

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