Fracture type tight reservoir fluid identification method and system, identification instrument, medium and application

Abstract

The invention belongs to the technical field of fracture-type tight reservoir fluid identification, and discloses a fracture-type tight reservoir fluid identification method and system based on a PSVwave reflection coefficient, an identification instrument, a medium and application, and the method comprises the steps: comparing obtained relational expressions between flexibility parameters and anisotropy parameters, and deducing the PSV wave reflection coefficient of an equivalent pore fracture medium; carrying out normalization processing on the obtained PSV wave reflection coefficient; andcarrying out azimuth AVO characteristic numerical simulation of the isotropic medium / equivalent pore crack medium double-layer model based on the normalized reflection coefficient result. According tothe method, the fluid type discrimination capability of the pore crack medium under the conditions of multidirectional observation and small-angle incidence is improved, and the reflection coefficient change difference of the pore crack medium under different fluid saturation states in three types of AVO equivalent pore crack media caused by the change of the crack density and the matrix porosityis obtained; the fracture density and the matrix porosity can be used as better fluid indication factors for guiding fluid identification of pore fracture reservoirs.

Description

technical field [0001] The invention belongs to the technical field of fracture-type tight reservoir fluid identification, in particular to a fracture-type tight reservoir fluid identification method, system, identification instrument, medium and application. Background technique [0002] At present, natural fractures are important rock features. They not only provide basic storage space and permeability characteristics for oil and gas, but also play a key role in communicating scattered local storage spaces to form large-scale reservoirs. The accumulation, enrichment, and migration are particularly important, which have attracted extensive attention and in-depth research in the academic circles. [0003] Common HTI media and VTI media in natural fractured media are weakly anisotropic media. Typical equivalent theoretical models of HTI media are mainly linear sliding model, Hudson fracture model and Thomsen equivalent pore model. The Hudson model uses fracture parameters a...

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