Method for determining abnormal high pressure waves and range of basin by utilizing sterane isomerization parameters

Abstract

The invention provides a method for determining abnormal high pressure waves and range of a basin by utilizing sterane isomerization parameters. The method comprises the following steps: determining the change rule, evolving with the sterane isomerization parameters, in hydrocarbon source rocks, and drawing a sterane isomerization parameter evolving curve of the hydrocarbon source rocks; establishing variation tendency with depth of the sterane isomerization parameters of a monophyletic oil deposit; determining the variation tendency of the sterane isomerization parameters in a transportation process from the hydrocarbon source rocks to the oil deposit; determining hydrocarbon expulsion threshold of the hydrocarbon source rocks, calibrating and dividing a sterane isomerization parameter boundary line between abnormal high pressure and a buoyancy effect interval; carrying pressure characteristic analysis on continuous reservoir and hydrocarbon accumulation in a single well; and according to the sterane isomerization parameter boundary line, separately dividing waves and range of power on a profile and a plane. The method for determining abnormal high pressure waves and range of the basin by utilizing sterane isomerization parameters realizes quantitative characterization of power conditions of an oil-gas hydrocarbon accumulation period, defines the pressure structure, in the hydrocarbon accumulation period, of the basin, and provides technical support for quantitative research on oil-gas hydrocarbon accumulation.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining the sweeping range of abnormally high pressure in a basin by using sterane isomerization parameters. Background technique [0002] The process of oil and gas migration and accumulation is the core of oil and gas geology research, and it is also one of the key issues restricting current oil and gas exploration. The dynamic analysis of the accumulation process is the most important link. Due to the lack of effective quantitative characterization methods, the It has also become a hot spot and bottleneck of research at home and abroad. The main methods of paleopressure research include numerical simulation, inclusion method, etc. Of course, these methods also have certain limitations: the numerical simulation method is limited by many geological conditions, and requires the verification of geological data; the inclusion method has multiple soluti...

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Problems solved by technology

The main methods of paleopressure research include numerical simulation, inclusion method, etc. Of course, these methods also have certain limitations: the numerical simulation method is limited by many geological conditions, and requires the verification of geological data; the inclusion method has multiple solutions. Large, sampling and testing are also easily limited by actual conditions

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