An improved geomechanical model for the prediction of fracture generation and distribution in brittle reservoirs.

ABSTRACT: It is generally difficult to predict fractures of low-permeability reservoirs under high confining pressures by data statistical method and simplified strain energy density method. In order to establish a series of geomechanical models for the prediction of multi-scale fractures in brittle tight sandstones, firstly, through a series of rock mechanics experiments and CT scanning, we determined 0.85 σc as the key thresholds for mass release of elastic strain energy and bursting of micro-fractures. A correlation between fracture volume density and strain energy density under uniaxial stress state was developed based on the Theory of Geomechanics. Then using the combined Mohr-Coulomb criterion and Griffith's criterion and considering the effect of filling degree in fractures, we continued to m

SUBMITTER: Feng J 

PROVIDER: S-EPMC6221284 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature