Quantitative analysis method of liquid-state products of hydrocarbon generation and expulsion simulation experiment

Abstract

The invention provides a quantitative analysis method of liquid-state products of a hydrocarbon generation and expulsion simulation experiment. The method comprises the following steps: collecting and treating the liquid-state products of the hydrocarbon generation and expulsion simulation experiment, wherein the step comprises light hydrocarbon collecting, heavy hydrocarbon collecting, standard sample adding, dehydrating, filtering and concentrating; carrying out quantitative analysis on the liquid-state products of the hydrocarbon generation and expulsion simulation experiment by utilizing a comprehensive two-dimensional gas chromatography-hydrogen flame ionization detector, wherein the step comprises primary comprehensive two-dimensional analysis, natural volatilization for constant weight as well as secondary comprehensive two-dimensional analysis; calculating full-component quantitative result of the liquid-state products of the hydrocarbon generation and expulsion simulation experiment. The quantitative analysis method disclosed by the invention can be used for avoiding volatilization of light hydrocarbon, has better experiment result repeatability and simple and easy-to-learn operation, and provides a reliable technical method for the quantitative analysis of the liquid-state products of the hydrocarbon generation and expulsion simulation experiment, so that estimation on basin oil and gas resource amount is more objective.

Description

technical field [0001] The invention relates to a quantitative analysis method for liquid products in a simulation experiment of hydrocarbon generation and expulsion, and belongs to the technical field of oil and gas geochemistry. Background technique [0002] The hydrocarbon-generating potential and resource evaluation of source rocks in sedimentary basins is one of the core scientific issues in oil and gas research. Hydrocarbon generation and expulsion simulation experiments are currently widely used important technical means for evaluating the hydrocarbon-generating potential of source rocks and regional oil and gas resources. The products of hydrocarbon generation and expulsion simulation experiments include gaseous products and liquid products. Gaseous products refer to components that are gases at normal temperature and pressure, including methane, ethane, propane, butane, and carbon dioxide. The liquid product refers to the carbon number distribution from C 5 to C ...

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Problems solved by technology

The oil-water separation and weighing method proposed by Zhang Wenzheng et al. High, light hydrocarbons are severely volatilized during the oil-water separation process and constant weight process, and it is very difficult to completely separate oil-water

A small amount of water mixed with light hydrocarbons or a small amount of light hydrocarbons left in water will cause great errors, so the experimental results are difficult to repeat, and the accuracy of the quantitative results of light hydrocarbons obtained cannot be determined

Adding organic solvents such as dichloromethane to the container for collecting light hydrocarbons can avoid the loss of light hydrocarbons during the oil-water separation process, but the presence of solvents cannot quantify light hydrocarbons by weighing methods

Zheng Lunju et al. (Zheng Lunju, Ma Zhongliang, Wang Qiang et al. Quantitative evaluation of hydrocarbon generation potential by pyrolysis of source rocks in limited space. Petroleum Experimental Geology, 2011, 33(5):452-459) used conventional gas chromatography to quantify light hydrocarbons, but Since the collected light hydrocarbon components contain colloid and other components at the same time, the peaks of saturated hydrocarbons and aromatic hydrocarbons overlap and co-distillate, which interferes with the standard sample peaks to varying degrees, and cannot obtain accurate quantitative results of light hydrocarbons.

Even with a light hydrocarbon (C 15 The following hydrocarbons) quantitative results, due to the heavy hydrocarbons containing C 15 Part of the composition of the following hydrocarbons, the amount of liquid hydrocarbons still cannot be determined

Therefore, in the actual hydrocarbon generation and expulsion simulation experiments, the collected light hydrocarbons and other liquid products are often mixed together for analysis, because C 15 The following hydrocarbon components are volatilized and lost, and the results of liquid products obtained are incomplete, which affects the estimation of resources

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