Method and device for confirming rock permeability

Abstract

The invention provides a method and a device for confirming the rock permeability. The method comprises the following steps: measuring a series of selected rock core samples to obtain rock permeability values; measuring transverse relaxation time T2 distribution and rock core capillary pressure curves of water-saturated rock core samples with different permeability values; confirming the relationship of the transverse relaxation time T2 distribution of the rock core samples and pore throat radius distribution of the rock core samples according to a function relationship of the transverse relaxation time T2 distribution and the rock core capillary pressure curves; uniformly dividing the transverse relaxation time T2 distribution and the pore throat radius distribution of the rock core samples into n groups; and calculating porosity components and average pore throat radiuses of the different groups of rock core samples. The rock permeability is confirmed by dividing the plurality groups of porosity components and average pore throat radius components through the nuclear magnetic resonance T2 distribution. The seepage characteristics of reservoir rocks are reflected in a relatively real manner through the permeability calculated by using the method and the device provided by the invention, the consistency with the rock core analysis permeability result is good, and the calculation result is accurate.

Description

technical field [0001] The invention relates to well logging technology in oil exploration, in particular to a method and device for determining rock permeability. Background technique [0002] Permeability reflects the ability of a fluid to flow in a porous medium under a certain pressure difference. There are many factors affecting rock permeability, the main influencing factors are porosity, irreducible water saturation and pore structure. The traditional method of calculating rock permeability using conventional logging data is to establish a permeability calculation model based on the correlation analysis of logging parameters such as permeability and porosity, because conventional logging data cannot reflect the reservoir fluid under a certain pressure difference. Therefore, it is difficult to directly calculate the permeability. The permeability model established by using conventional logging data is a regional statistical model, which has strong regional limitations...

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Problems solved by technology

The Coates model and the SDR model have a good application effect in sandstone reservoirs with medium and high porosity and permeability, but in the calculation of permeability of low porosity and low permeability reservoirs and tight sandstone reservoirs, large errors will occur, affecting reservoir permeability Evaluation of Quantitative Interpretation of Logging Rate

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