Hydrocarbon accumulation analysis method based on fracture structure

Abstract

The invention provides a hydrocarbon accumulation analysis method based on a fracture structure and relates to the hydrocarbon accumulation field. Oil-gas exploration can be effectively guided. The method comprises the following steps of selecting fractures of different levels, observing an internal structure characteristic, and according to a fractured zone rock breakage degree, dividing into two structure unit layers of a fracture zone and a crack zone; taking samples of the fracture zone and the crack zone to carry out field outcrop observation and microscope observation, and according to a condition that permeability of a fluid containing an oil gas is increased along with development of a crack, depicting a moving track of the fluid containing the oil gas in the above two structure unit layers; taking cements of the fluids containing the oil gas in different structure unit layers, through homogeneous temperature analysis of an inclusion, strontium isotope analysis and in-situ microelement analysis, determining a source and a phase of the fluid containing the oil gas; and through division of the above structure unit layers, the moving track of the fluid containing the oil gas, and the source and the phase of the fluid containing the oil gas, drawing a hydrocarbon accumulation mode pattern. Through the hydrocarbon accumulation mode pattern, hydrocarbon accumulation effect analysis is performed.

Description

technical field [0001] The invention relates to the field of oil and gas accumulation, in particular to an analysis method for oil and gas accumulation based on fault structures. Background technique [0002] Oil and gas accumulation refers to the whole process of oil and gas migration and accumulation, in which oil and gas migration is crucial to the analysis of oil and gas accumulation, and is a key link in oil and gas accumulation. Fault-controlled accumulation is a common and important petroleum geological phenomenon. Fault-controlled oil and gas reservoirs are an important type of oil and gas reservoirs, and they are the main type of oil and gas reservoirs in many oil-gas-bearing basins. For example, in the Junggar Basin in western China, fault-controlled oil and gas reservoirs account for 70%. % and more than 90% in the northwest margin of the basin. In the analysis of oil and gas reservoirs, fracture is an important and core subject. [0003] The study of oil and ga...

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Problems solved by technology

[0004] The study of fault opening and closing has obtained many important understandings, and proposed fault opening and closing modes including principal stress sealing, lithological configuration, mudstone smear sealing, time configuration sealing, and occurrence configuration sealing; however, due to the influence of fault opening and closing Many factors make the study of fault opening and closing very complicated, and there is no suitable method for analyzing oil and gas accumulation based on fault structure in the prior art

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