An anisotropic sound velocity measuring device for square rock samples with fractures

Abstract

The invention provides an anisotropic acoustic velocity measurement device of rock samples with fractures. The device comprises a high pressure reactor, a rubber sleeve and acoustic wave transducers,the high pressure reactor comprises a reactor body upper cover and a reactor body base, the cylindrical rubber sleeve comprises an upper end plug, a lower end plug and a sample chamber in the middle of the rubber sleeve, a rubber sleeve holder and the rubber sleeve positioned on the rubber sleeve holder are arranged on the reactor body base, extension columns are arranged on two sides of a peripheral horizontal line of the rubber sleeve, and the acoustic wave transducers are arranged in the extension columns and used for detecting the wave velocity of transverse waves and longitudinal waves ofthe rock samples. The device has the advantages that the velocity of the transverse waves and the longitudinal waves of the samples with the fractures in different directions are simultaneously measured, requirements for the shapes of the transducers are lowered, and measurement efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to an anisotropic sound velocity measuring device for square rock samples containing cracks in petrophysical experiments. Background technique [0002] With the continuous deepening of oil and gas exploration and development, fractured oil and gas reservoirs have become an important field of oil and gas exploration today. Many countries and regions have found industrially valuable fractured oil and gas in tight sandstone, mudstone, igneous rock and carbonate rock. It accounts for a considerable part of the world's oil reserves and production. For fractured reservoir rocks, anisotropic sound velocity measurement is a common method to evaluate fractures. [0003] At present, there are mainly two types of anisotropic sound velocity measurement methods commonly used: one is to sample rocks in different directions, and measure their longitudinal and shear wave velocities respective...

AI Technical Summary

Problems solved by technology

[0006] However, the samples used for anisotropic sound velocity measurement are cylindrical plunger samples used in laboratory routine sound velocity measurement, and the sample sampling direction is parallel to the formation direction. For fractured reservoirs, the direction of fracture distribution is random, and only The sound velocity parallel to the formation direction is difficult to effectively identify fractures and evaluate fractured reservoirs

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