Method and device for determining accumulation probability of lithologic oil and gas reservoirs

Abstract

The invention provides a method and device for determining the reservoir forming probability of lithologic oil-gas reservoirs. The method includes the steps that the phase index is calculated, the potential index is calculated, and the phase-potential coupling index is calculated according to the phase index and the potential index; the source control index is calculated; the phase-potential-source composite reservoir-controlling index is calculated through the phase index, the potential index and the source control index; the above steps are executed repeatedly, so that the phase-potential-source composite reservoir-controlling index of each lithologic oil-gas reservoir in the multiple lithologic oil-gas reservoirs to be analyzed is obtained through calculation; the quantitative relation between the phase-potential-source composite reservoir-controlling indexes and the reservoir forming probability is established, and the reservoir forming probability of the lithologic oil-gas reservoirs in a research area is analyzed according to the established quantitative relation. By the adoption of the method and device, the technical problems that reservoir forming probability forecasting of the lithologic oil-gas reservoirs in the prior art still stays in the semi-quantitative stage, and accurate quantitative research can not be achieved are solved, and therefore the quantitative research purpose of the reservoir forming probability of the lithologic oil-gas reservoirs is achieved.

Description

Technical field [0001] The invention relates to the technical field of oil and gas surveying, in particular to a method and device for determining the accumulation probability of a lithologic oil and gas reservoir. Background technique [0002] The trap formation probability of a lithologic oil and gas reservoir refers to the possibility of oil and gas in a certain trap. It is used to evaluate whether the trap can form a reservoir. At the same time, the oil and gas accumulation probability is also used to characterize hydrocarbon resources such as oil and gas. The possibility of accumulating oil and gas in a certain area or exploration target. The greater the probability of oil and gas accumulation, the higher the possibility of oil and gas accumulation. Studying the probability of accumulation can effectively determine the exploration target, and at the same time evaluate the effectiveness of the target. Through the specific evaluation results, the target can be implemented in t...

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Problems solved by technology

[0003] Therefore, in oil and gas exploration and development, 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 research on the main controlling factors of lithologic reservoir formation are directly related The success rate of oil and gas exploration, however, due to the complexity of geological conditions and the uncertainty of accumulation conditions, the research on the probability of accumulation has been slow

[0004] For the study of the law of oil and gas enrichment in lithologic reservoirs, especially for the quantitative study of the probability of accumulation, various methods have been proposed, such as: prediction of accumulation probability of facies-controlled traps, accumulation probability of potential-controlled traps However, in general, these methods are based on a single factor, and the prediction of the accumulation probability of lithologic oil and gas reservoirs is still in the semi-quantitative stage, and accurate quantitative analysis has not yet been achieved. Research

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