A Method of Retrieving the Distribution Characteristics of Rock Pores Using the Theory of Pore and Fractured Media Elastic Waves

Abstract

The invention discloses a method for inverting the distribution characteristics of rock pores by using the elastic wave theory of pores and fractured media. 2. Use the pore-crack theory of multi-form cracks to simulate the elastic wave velocity of the rock; Step 3. For cracks with multiple forms in the rock, the pore aspect ratio spectrum at different pressure points can be calculated from the pore aspect ratio spectrum at 0 effective pressure ; Step 4, establish the inversion objective function; Step 5, set the fractures of various aspect ratios, including pores; Step 6, repeatedly adjust the aspect ratio and fracture density of the various fractures of the rock under 0 effective stress, so that the objective function reaches The minimum value, the pore aspect ratio spectrum of the rock at each pressure point is obtained. The invention can solve the technical problems of obtaining rock pore structure characteristics more accurately, analyzing rock mechanics, acoustics and fluid seepage properties, and the like.

Description

A method for inversion of rock pore distribution characteristics using elastic wave theory of porous and fractured media Methods technical field The invention belongs to the field of petrophysics, be specifically related to a kind of inversion rock using elastic wave theory of pore, fracture medium Methods for the characterization of pore distribution in stone. Background technique The characteristics of pore distribution in rock have a very important influence on the mechanical, acoustic and fluid permeability properties of rock. The sound is the focus of reservoir rock acoustics. Measured by the parameter aspect ratio, the salient feature of rock pore distribution is the inclusion of Contains pores with aspect ratio ~ 1 and fractures with aspect ratio << 1, while the distribution of fractures with different morphologies can be well characterized by aspect ratio spectra. describe. Determining the aspect ratio spectrum of rock pores has been an area of ​​re...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for inverting the distribution characteristics of rock pores using the elastic wave theory of pores and fractured media, so as to solve the problem of further expanding the traditional theory to include the interaction of pores and multi-form fracture systems. The change of the fracture system with pressure is described as the closure of fractures of different shapes (aspect ratio) under different pressures, in order to obtain the characteristics of the rock pore structure more accurately, and determine the mechanical, acoustic and fluid permeability properties of the rock and other technical issues

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