Separation method for light/heavy hydrocarbons in different occurrent states in clay level of argillaceous source rock

Abstract

The invention provides a separation method for light / heavy hydrocarbons in different occurrent states in a clay level of an argillaceous source rock. The separation method comprises the following steps: crushing a fresh part of a core of the argillaceous source rock and soaking and extracting a clay level component; carrying out Soxhlet extraction; saponifying the extraction residues by using a saponifying liquid and respectively extracting the saponified residues by using n-pentane and dichloromethane; pickling the saponified residues by using an acidolysis solution and respectively extracting the pickled residues by using n-pentane and dichloromethane; treating the pickled residues by a HF and HCl mixed liquid and respectively extracting the pickled residues by using n-pentane and dichloromethane; and respectively combining the treatment liquids and the extraction liquids and separating by column chromatography to obtain light / heavy hydrocarbons. The separation method for light / heavy hydrocarbons in different occurrent states in the clay level of the argillaceous source rock provided by the invention extremely improves the problem that light hydrocarbons are lost in other methods and can calibrate an occurrent space of hydrocarbons by combining mineral analysis.

Description

technical field [0001] The invention relates to the research field of oil and gas geological exploration, in particular to a method for separating light and heavy hydrocarbons in different occurrence states in the clay fraction of muddy source rocks. Background technique [0002] The separation technology of light and heavy hydrocarbons in different occurrence states in clay fraction is a source rock analysis technology to obtain light hydrocarbons and heavy hydrocarbons in different occurrence modes in argillaceous source rocks. The separation of light / heavy hydrocarbons in different occurrence states can be effectively used to study the content and composition of light / heavy hydrocarbons in different occurrence states in argillaceous source rocks, and to clarify the occurrence locations of light / heavy hydrocarbons in different occurrence states. The accumulation and accumulation of unconventional oil and gas provide information, and then provide guidance for the exploratio...

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Problems solved by technology

Among them, the chloroform extraction only obtains the soluble organic matter adsorbed in the source rock in a physical way, and further obtains some residual hydrocarbons through column chromatography, mainly heavy hydrocarbons, which cannot fully characterize the residual hydrocarbons in the source rock. total hydrocarbon

In rock pyrolysis experiment, the hydrocarbons are released by means of temperature programming, and then the hydrocarbon content is detected by the hydrogen ion flame, but due to the temperature S 1 , S 2 are the total hydrocarbons obtained before and after 300°C, and the relationship between the obtained hydrocarbons and their occurrence carriers cannot be characterized

[0004] Continuous processing has been applied to the study of soil organic matter and ocean surface sediment organic matter, but most of the separation objects are kerogen organic matter extracted from sediments or source rocks, and organic matter in different occurrence states has been identified, but these organic matter are all Mainly heavy hydrocarbons or fatty acids, for C 15 The following analysis of light hydrocarbons is not fully considered

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