Method and device for determining lithologic oil-gas reservoir forming probability

Abstract

The invention discloses a method and device for determining lithologic oil-gas reservoir forming probability. The method comprises the following steps of determining the oil-gas reservoir forming probability of a lithologic oil-gas reservoir inside a target area under the control of a source rock single factor; determining the oil-gas reservoir forming probability under the control of a single factor of a low potential area; determining the oil-gas reservoir forming probability under the control of a single factor of sedimentary facies; determining the oil-gas reservoir forming probability under the control of a single factor of a regional cap rock; determining the lithologic oil-gas reservoir forming probability according to the oil-gas reservoir forming probabilities under the control of the single factors of the source rock, the low potential area, the sedimentary facies and the regional cap rock, wherein according to the step of determining the oil-gas reservoir forming probability under the control of the single factor of the low potential area, interface potential indexes of the low potential area are determined according to the maximum interface potential, the minimum interface potential, the maximum porosity and the minimum porosity of the low potential area, and then the oil-gas reservoir forming probability under the control of the low potential area is determined. According to the technical scheme, the reservoir forming probability of the lithologic oil-gas reservoir is quantitatively predicted, and the exploration direction of the lithologic oil-gas reservoir is indicated.

Description

technical field [0001] The invention relates to the technical field of quantitative forecasting of oil and gas resources, in particular to a method and device for determining the accumulation probability of lithologic oil and gas reservoirs. Background technique [0002] With the improvement of exploration degree, lithologic reservoirs are the focus of current exploration, and the prediction of favorable areas for lithologic reservoir development is also difficult. The oil and gas enrichment law and accumulation probability of lithologic reservoirs in the study area have always been a concern of people , the analysis and quantitative study of the main factors controlling the formation of lithologic oil and gas reservoirs are directly related to the success rate of oil and gas exploration. However, due to the complexity of geological conditions and the uncertainty of accumulation conditions, the research progress of accumulation probability slow. [0003] Aiming at the above...

AI Technical Summary

Problems solved by technology

However, first of all, the “optimal facies-low potential coupling reservoir control” model only takes into account the sedimentary facies and low potential areas of lithologic reservoirs, and does not consider the controlling effect of effective source rocks and regional cap rocks on the formation and distribution of reservoirs ; secondly, this method fails to conduct careful research and quantitative characterization of the concept of low potential area

Therefore, the methods provided by the prior art cannot directly guide the exploration of oil and gas fields

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