Method utilizing C29 sterane isomerization parameters for representing oil-gas migration

Abstract

The invention provides a method utilizing C29 sterane isomerization parameters for representing oil-gas migration. The method includes: firstly, creating a base curve according to thermal evolution of source rocks and crude oil; secondly, subjecting oil samples to chromatography / mass spectrometry analytical test; thirdly, calculating the C29 sterane isomerization parameters of the oil samples, tracing oil-gas migration paths according to a mode utilizing the C29 sterane isomerization parameters for representing oil-gas migration, and predicting favorable oil-gas accumulation areas. The method utilizing the C29 sterane isomerization parameters for representing oil-gas migration has the advantages that by means of calculating the C29 sterane isomerization parameters of the crude oil in subsurface reservoirs and analyzing change trends of the subsurface reservoirs, an oil-gas migration process including migration paths, power conditions, migration distances and the like is traced effectively, so that oil-gas accumulation study can be detailed, and the method is of important significance to an oil-gas migration mechanism and distribution regularities.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, especially the tracking of migration paths in the process of oil and gas accumulation, specifically a method using C 29 The method of sterane isomerization parameters to characterize oil and gas migration direction and migration mode. Background technique [0002] At present, the research methods widely used at home and abroad to trace oil and gas migration paths mainly include crude oil physical property method, gas-oil ratio method, maturity method, geochemical index method (including hydrocarbon biomarker compound method and non-hydrocarbon nitrogen-containing compound method). )Wait. The tracing principle is that during the migration of oil and gas underground, physical adsorption and desorption or chemical dissolution and analysis will occur between the hydrocarbon components and the surface of solid particles, and the hydrocarbon components will be separated in an orderly m...

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Problems solved by technology

Each method shows certain adaptability and sensitivity to different geological conditions. Among them, the crude oil physical property method and the gas-oil ratio method have very strict requirements on the temperature, pressure and storage conditions of the reservoir, and their application is greatly restricted. Compounds are trace components in crude oil, so they are greatly affected by separation and analysis methods. Therefore, the hydrocarbon biomarker method is currently the most commonly used method. Early Seifert et al. proposed the use of sterane isomerization parameters for oil and gas migration analysis. However, it only uses the parameter combination diagram to clarify whether oil and gas migrate, and has not covered the migration direction and migration mechanism.

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