Separation and quantification method of different occurrence-mode organic matter in hydrocarbon source rock

Abstract

The invention relates to a separation and quantification method of different occurrence-mode organic matter in hydrocarbon source rock. The separation and quantification method comprises the followingsteps that hydrocarbon source rock samples are ground and dried, and parts of the samples are weighed for organic carbon testing; the hydrocarbon source rock samples are subjected to soxhlet extraction through an organic solvent, and parts of extracted residue are weighed for organic carbon testing; the extracted residue is oxidized, and parts of the oxidized residue are weighed for organic carbon testing; and the mass fraction, accounting for the total organic carbon in the rock, of organic carbon separated in each step is calculated through a difference method, and quantification of free-state organic matter, mineral complex state organic matter and particulate organic matter is completed. The separation and quantification method adopts the continuous processing process of organic solvent extraction and sodium persulfate oxidation, thus the free-state organic matter and the mineral complex state organic matter in the hydrocarbon source rock are effectively removed, the contents of the free-state organic matter, the mineral complex state organic matter and the particulate organic matter in the hydrocarbon source rock are quantitatively analyzed, the efficiency is high, the cost is low, and data are accurate.

Description

technical field [0001] The invention relates to the field of geological exploration and development of oil and gas, in particular to a method for separating and quantifying organic matter in different occurrence states in source rocks. Background technique [0002] The organic matter in source rocks is the basis of oil and gas generation, and the study of the occurrence of organic matter is the premise of oil and gas resource exploration. Traditional petroleum geology studies regard kerogen as the only occurrence form of organic matter, but in fact there are multiple occurrence forms of organic matter in source rocks. For example, based on the binding relationship with minerals, the organic matter in source rocks can be divided into three types: free state, mineral composite state and granular state. These organic matter in different occurrence forms have gone through different geological preservation processes, and there are significant differences in hydrocarbon generatio...

AI Technical Summary

Problems solved by technology

Therefore, chemical oxidation is a reasonable method for separating organic matter in different occurrence states in source rocks, but there is no unified standard separation process at present.

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