Reservoir-cap combination logging evaluation method and device

Abstract

The invention provides a method and device for evaluating reservoir cap association welllogging, wherein the method comprises the following steps of: determining breakthrough pressure of a target shale cover layer according to the porosity of the target shale cover layer, and acquiring at least one auxiliary classification index corresponding to the target shale cover layer; determining the type of the target shale cover layer in a preset cover layer type library based on the breakthrough pressure and the auxiliary classification index of the target shale cover layer, wherein the cover layer type library is used for storing the corresponding relationship between each type of the cover layer and the breakthrough pressure and the auxiliary classification index; and combining the type of thetarget shale cover layer with a known evaluation result of the target reservoir covered by the target shale cover layer to obtain a comprehensive evaluation result aiming at the target reservoir. Theperformance classification of the shale cover layer can be accurately and effectively obtained, the storage conditions of the oil and gas reservoirs and the sealing performance of the oil and gas reservoirs can be combined with reservoir evaluation, the interpretation coincidence rate of welllogging evaluation can be effectively improved, and the accuracy of welllogging evaluation can be improved.

Description

technical field [0001] The invention relates to the technical field of petroleum detection, in particular to a reservoir-cap combined logging evaluation method and device. Background technique [0002] Cap rock is the main controlling factor of oil and gas accumulation, and good cap rock is a necessary condition for the formation of large oil and gas accumulation. At present, the international research on capping layers has entered into the combination of macroscopic qualitative and microscopic parameters, and has developed diffusion theory and storage box theory at the same time, but the evaluation criteria are not systematic and varied. Domestic research on caprocks is generally limited to the quantitative determination of microscopic parameters. According to breakthrough pressure, permeability, and classification of caprocks, the determination of various microscopic parameters of caprocks relies on samples obtained by drilling and coring, which is necessary. Yes, indispe...

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Problems solved by technology

Insufficient understanding of residual oil and gas reservoirs leads to high exploration investment and low profitability

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