Crude oil mass fracture maturity evaluation method

A technology of maturity and crude oil, applied in the field of petroleum geological exploration, can solve the problems of simultaneous quantitative analysis, component loss, incomplete recovery of adamantane compounds, etc.

Active Publication Date: 2015-06-03
PETROCHINA CO LTD
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Problems solved by technology

Among them, the quantitative analysis process of light hydrocarbon series compounds is relatively simple, using CS 2 Dissolve an accurately weighed crude oil sample, add 0.1023 mg/mL isohexene 100 μL for quantification, but due to the slow temperature rise program of gas chromatography when analyzing light hydrocarbons, it cannot be quantitatively analyzed simultaneously with other components
Quantitative analysis of n-alkanes, steroids and aromatic compounds, firstly through silica gel and Al 2 o 3 The chromatographic column separates saturated hydrocarbons and aromatic components, and then add C

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Embodiment 1

[0039] The present embodiment provides a method for evaluating the maturity of crude oil quality fractions, which includes the following steps:

[0040] (1) Accurately take 30-40 mg of crude oil sample with an electronic balance, place it in a beaker, mix it with dichloromethane, and add 100 μL of a mixed standard sample with dichloromethane as a solvent after standing still for 12 hours. D of 0.0181mg / mL 16 -Adamantane, 300 μL of C at a concentration of 0.5068 mg / mL 24 D. 50 , 100 μL of 5α-androstane at a concentration of 0.1068 mg / mL and 20 μL of D at a concentration of 0.1139 mg / mL 10 - Dichloromethane solution composed of anthracene, take 100 μL mixed standard sample when using, and naturally volatilize the n-hexane solution added to the mixed standard sample in a fume hood to concentrate it to about 1 mL to obtain the sample to be tested;

[0041] (2) Analyze the sample to be tested with a comprehensive two-dimensional gas chromatography-hydrogen flame ionization detec...

Embodiment 2

[0066] This embodiment provides a method for evaluating the maturity of crude oil quality fractions. The crude oil analyzed is Well Tazhong 62, a 4729.0m Ordovician reservoir, normal black oil, and a density of 0.87g / cm 3 , the specific steps of the method are the same as in Example 1.

[0067] According to the parameter mass content ratio (B) and maturity equation coefficient (C), through the maturity parameter mass content ratio and maturity (VLR E o %, abbreviated as R%) relational equation The calculated fitting maturity (D) is shown in Table 1. More than 50 crude oil samples were taken in the same research area, and adamantane compounds, light hydrocarbon compounds, n-C 9 + The mass content of specific compounds included in normal alkanes homologues, steroid biomarker compounds, polycyclic aromatic hydrocarbons and their homologues, thiophenes and aromatized steranes, and according to the mass content ratio of 42 parameters The mass content of all compounds involved ...

Embodiment 3

[0073] This embodiment provides a method for evaluating the maturity of crude oil quality fractions. The crude oil analyzed is the middle ancient 7,5797.0m Ordovician storage, condensate oil, and the density of crude oil is 0.79g / cm 3 , the specific steps of the method are the same as in Example 1.

[0074] Table 2 is the calculation table for the maturity of the quality fraction of condensate oil in Well Zhonggu 7. The calculated maturity of the quality fraction of condensate oil in Well Zhonggu 7 is 23.65, which is significantly higher than the maturity of crude oil in Well Tazhong 62.

[0075] Table 2 Maturity calculation table of condensate oil quality fractions in Well Zhonggu 7

[0076]

[0077]

[0078] figure 2 It is the result map of the evaluation results of the crude oil sample mass fraction maturity in this embodiment. From figure 2 It can be seen from the figure that the mass content of the four types of mass fractions of light hydrocarbons, saturated h...

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Abstract

The invention provides a crude oil mass fracture maturity evaluation method. The method comprises the following steps: weighing a quantitative crude oil sample and mixing the weighed crude oil sample with methylene dichloride, adding a mixed master standard taking the methylene dichloride as a solvent after standing by for 10-24h, detecting the relative contents of full-mass fractures in the sample such as light dydrocarbon series, adamantane, normal alkane/isoalkane, terpenoid biomarkers, polycyclic aromatic hydrocarbon and homolog, thiophene and aromatic steroid hydrocarbons, indistinguishable compounds UCM and the like by virtue of full-two-dimensional gas chromatography-flame ionization detector (FID), and establishing a comprehensive evaluation method for crude oil mass fracture maturity on the basis of the principle that the relative contents of different types of molecular components in crude oil reflect different maturity evolution stages. The method, by virtue of the full-two-dimensional gas chromatography, can achieve simultaneous quantitative analysis on crude oil full-mass fracture content, and the method can be used for evaluating the crude oil maturity by virtue of crude oil mass fracture, so as to guarantee the accuracy and the contrasting property of the crude oil maturity evaluation.

Description

technical field [0001] The invention relates to a method for evaluating the maturity of crude oil quality fractions, in particular to a method for measuring the content of crude oil quality fractions by comprehensive two-dimensional gas chromatography and then evaluating the maturity of crude oil, belonging to the technical field of petroleum geological exploration. Background technique [0002] Crude oil maturity is used to describe the thermodynamic reaction degree of sedimentary organic matter conversion to generate crude oil. Accurate understanding of crude oil maturity is an important means to predict the oil generation process of potential source rocks and study the history of oil and gas charging and accumulation process. Early Rock-Eval pyrolysis, vitrinite reflectance (Ro), thermal alteration index (TAI), etc. are only applicable to the maturity evaluation of source rocks, and are rarely used in the maturity evaluation of crude oil. Since the 1970s Since then, the m...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 张水昌苏劲黄海平王汇彤张斌王晓梅王宇毕丽娜
Owner PETROCHINA CO LTD
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