Evaluation method of oil gas filling capacity from source rock layer to karstic reservoir

Abstract

The invention relates to an evaluation method of oil gas filling capacity from a source rock layer to a karstic reservoir. Based on the establishment of a stratigraphic framework, the method comprises the following steps: counting and dividing the contact relationship types of the source rock layer and the karstic reservoir; determining the influencing parameters of the oil gas filling capacity; performing quantitative calculation on the oil gas filling capacity; achieving lateral comparison of the oil gas filling capacity. According to the evaluation method, various influencing factors, namely, lithology types, source rock hydrocarbon-generating strength, source reservoir contact relationship types, reservoir porosity and reservoir permeability of the source rock layer in different positions are comprehensively considered, and the defect that oil gas filling capacity is analyzed only through analysis of the source rock layer and the conduction system or simple description of the position contact relationship between the source rock layer and the reservoir in the prior art is overcome; compared with the prior art, the evaluation method has the following advantages: the analysis result is more accurate, the concrete oil gas filling position and filling capacity can be reflected, the oil gas filling capacity difference in the contact range of the source rock layer and the karstic reservoir is specifically known, the oil gas exploration zones are optimized, and the success rate of well drilling is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas geological exploration, and in particular relates to an evaluation method for oil and gas charging ability from source rocks to karst reservoirs. Background technique [0002] Oil and gas charging from source rocks to reservoirs is a key link in the formation of oil and gas reservoirs. To some extent, it determines the oil and gas fullness of reservoir traps and the scale of oil and gas reservoirs, and evaluates the ability of oil and gas to charge from source rocks to reservoirs. For evaluating favorable exploration zones and exploration targets, reducing exploration risk is of great significance. At present, only a few scholars have conducted research on the ability of oil and gas to charge from source rocks to reservoirs, so how to evaluate the ability to charge oil and gas has become an urgent problem to be solved. Previous researchers proposed to use source rock potential (Demaison, 1991...

AI Technical Summary

Problems solved by technology

However, the current technology does not comprehensively consider the above factors, resulting in inaccurate analysis results, and failing to reflect the specific charging location and relative size of the oil and gas charging capacity, which affects the understanding of the oil and gas charging process and oil and gas exploration. The optimization of zones reduces the success rate of exploration

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