Method for treating biological marker by using kerabitumen hydrogenation pyrolysis catalyst

Abstract

The invention discloses a method for treating a biological marker by using a kerabitumen hydrogenation pyrolysis catalyst and belongs to the field of geochemistry. The method comprises the following steps of: reacting ammonium molybdate with sulfide to prepare a catalyst precursor thioammonium molybdate; preparing water/methanol solution of thioammonium molybdate; dipping a sediment sample into the solution and performing vacuum drying, so that the mass percentage of the loaded molybdenum (Mo) is 1 percent; hydrogenating and pyrolyzing the sample by adopting temperature programming operation; and collecting the reaction product by using a dry ice cold trap. The method is applicable in the fields of oil gas geochemistry, biogeochemistry, coal chemistry and the like. By the method, typical biomarker compounds can be effectively extracted from high-evolution sedimentary organic matters in a geologic body; the problem that sufficient biomarker compounds are generated difficultly in the conventional test system is solved; and deficiency of the free biomarker compounds is overcome by organic micromolecules bonded by covalent bond in the kerabitumen and obtained by pyrolyzing. The method is simple and convenient and high in catalytic property, and has a wide application prospect in the field of geochemistry.

Description

technical field [0001] The invention relates to a new method for extracting biomarkers covalently bonded with highly evolved sedimentary organic matter macromolecules in geological bodies, in particular to a method for treating biomarkers using kerogen hydropyrolysis catalysts, which belongs to the field of geochemistry. Background technique [0002] There are three main forms of biomarker compounds in the sedimentary organic matter of geological bodies: free state, bound state and chemically bonded state. Since the biomarker compounds in the bound state depend on the medium environment, the current focus is mainly on the research of inclusion organic matter in reservoir fluids, which can be used to evaluate the history of accumulation. Generally, in the literature, it usually refers to the combination of free or bonded biomarker compounds. The free state biomarker compounds are extracted by solvent extraction; while the bonded biomarker compounds mainly refer to macromolecu...

AI Technical Summary

Problems solved by technology

The content of free biomarker compounds in highly evolved source rocks is often extremely low, which cannot meet the requirements of instrumental analysis, and most of them have been strongly modified by heat, and their biosource and environmental indications are basically lost; while bonded biomarker compounds are hidden in the In macromolecular networks, protected by a certain degree of shielding, the effect on thermal alteration during thermal evolution shows a hysteresis effect

[0003] For sediments in geological bodies with low organic matter abundance and high evolution degree, some conventional organic geochemical research methods and indicators are often difficult to apply, which brings great challenges to the evaluation of hydrocarbon generation performance of source rocks and the fine comparison of oil and gas sources. very difficult

It is difficult to produce enough biomarker compounds with conventional experimental systems, including anhydrous / aqueous cracking of closed systems, transient cracking of open systems, and selective chemical degradation, because hydrogen-depleted macromolecules of highly evolved kerogen , the degradation reaction is difficult to carry out efficiently and completely

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