Hydrocarbon source rock analysis method

Abstract

The invention provides a hydrocarbon source rock analysis method. The method comprises the following steps: allowing a hydrocarbon source rock sample to generate gaseous hydrocarbon, a hydrocarbon source rock residual sample and selectable discharge oil under stimulated geological conditions, extracting the hydrocarbon source rock residual sample to obtain residual oil, carrying out family ingredient separation on the residual oil and the selectable discharge oil to obtain a non-hydrocarbon ingredient, detecting the non-hydrocarbon ingredient through negative ion electrospray-high resolution mass spectrometry, and analyzing organic carboxylic acid in the non-hydrocarbon ingredient; and the stimulated geological conditions comprise a fluid pressure of 25-80MPa and a lithostatic pressure of 40-100MPa. The hydrocarbon source rock analysis method is adopted to carry out detailed analysis on organic carboxylic acid compounds generated by the hydrocarbon source rock and research the generation process of the compounds. The method can provide abundant organic geochemistry information, and provides technical support for oil gas geology exploration, so the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development research, and the invention can also be applied to related fields such as geology, soil and environmental science. Background technique [0002] Petroleum organic carboxylic acid is not only an important material for the formation of secondary pores in the reservoir layer, but also an important component affecting the wettability of petroleum, and plays an important role in the occurrence and migration of petroleum. [0003] Petroleum organic carboxylic acids have multiple origins, they are not only the product of source rock hydrocarbon generation process, but also can be produced in large quantities in the late stage biodegradation process of petroleum. Previous studies have shown that the whole process of kerogen hydrocarbon generation is accompanied by the formation of organic carboxylic acids, which is related to the type, abundance, maturity, temperature and min...

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Problems solved by technology

[0006] There are obvious deficiencies in the existing research methods. First, the simulation of the process of generating organic carboxylic acids from source rocks does not take into account various geological boundary conditions, and the experimental results are inconsistent with the geological reality. Second, only low molecular weight substances such as formic acid, acetic acid, and propionic acid can be analyzed The information of organic carboxylic acids cannot make an in-depth analysis of the composition types (fatty acids, naphthenic acids, aromatic cyclic acids, etc.) and carbon number distribution of organic carboxylic acids in different evolution stages of source rocks.

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