A method for determining the maturity of crude oil by using the absolute content of terpanes in crude oil
A technology with absolute content and maturity, applied in the field of oil and gas accumulation research, it can solve the problems of lack of parameters with a wide range of applications, loss of meaning of indicating maturity, etc., and achieve the effect of a wide range of applications.
Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Ideally, with the thermal evolution of organic matter, the ratio of C / (C+D) gradually increases to the equilibrium point, corresponding to about 1.1% of the vitrinite reflectance. After that, the thermal evolution continues, and the ratio does not change. Even if there is an overturn, it loses the meaning of indicating maturity at a higher evolution stage. Therefore, affected by the thermochemical mechanism, different molecular compound parameters have their own scope of application, and there is no parameter with a wide range of application for the characterization of crude oil maturity. , so we invented a new method to determine the maturity of crude oil by using the absolute content of terpanes in crude oil, which solved the above technical problems
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specific Embodiment
[0023] The following is a specific embodiment of the application of the present invention, including the following steps:
[0024] In step 1, determine the main formations of crude oil sources through fine oil source comparison; according to the biomarker spectrum of crude oil, light hydrocarbon parameters, carbon isotope values and other local chemical information, combined with geological condition analysis, determine the main source of hydrocarbon sources rock formations.
[0025] In step 2, the distribution range of high-quality source rocks is determined according to the development of source rock formations, sedimentary facies characteristics, and organic geochemical characteristics in the sag or basin.
[0026] In step 3, within the distribution range of high-quality source rocks, the core section is screened, and high-quality source rock samples with a depth range of 1000 meters to 6000 meters are selected for intensive sampling. In order to ensure the accuracy of th...
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The invention provides a method for determining crude oil maturity by utilizing terpane absolute content in crude oil. The method for determining crude oil maturity by utilizing terpane absolute content in the crude oil comprises the following steps: step one, determining a main layer of a crude oil source through fine oil source comparison; step two, determining distribution range of the high-quality hydrocarbon source rock; step three, performing terpane absolute content determination by selecting the high-quality hydrocarbon source rock samples at different evolution stages; step four, establishing a change rule of high-quality hydrocarbon source terpane absolute content along with the thermal evolution degree, and drawing a mode curve; step five, analyzing an influence element of the trend line orientation change; and step six, performing crude oil maturity analysis and judgment according to the absolute content of the terpane in the crude oil, and dividing the thermal evolution stages. The method for determining crude oil maturity by utilizing terpane absolute content in the crude oil is convenient to provide important evidence for the crude oil factor type division and fine crude oil source comparison.
Description
technical field [0001] The invention relates to the field of oil and gas accumulation research, in particular to a method for determining the maturity of crude oil by using the absolute content of terpanes in crude oil. Background technique [0002] Maturity is a geochemical parameter that characterizes the evolution stage of organic matter in crude oil and source rocks. Accurate evaluation of crude oil maturity is an important basis for the classification of crude oil genetic types and oil source comparison. At present, it is relatively difficult to determine the maturity of crude oil from a quantitative perspective, because there is no reliable quantitative index that can reflect the true maturity of crude oil like vitrinite reflectance (Ro), so the evaluation of crude oil maturity is mostly qualitative. or semi-quantitative. The parameters and methods currently used to evaluate the maturity of organic matter in crude oil include: light hydrocarbon method, carbon isotope ...
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IPC IPC(8): G01V9/00G01N30/02
CPCG01N30/02G01V9/00
Inventor 王秀红刘庆陈涛张守春李政王忠鲍燕包友书任英姿金洪蕊
Owner CHINA PETROLEUM & CHEM CORP