The effect of the nanogranular nature of shale on their poroelastic behavior |
| |
| Authors: | J Alberto Ortega Franz-Josef Ulm Younane Abousleiman |
| |
| Institution: | 1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
2. Poromechanics Institute, University of Oklahoma at Norman, Norman, OK, USA
|
| |
| Abstract: | Natural composite materials are highly heterogeneous porous materials, with porosities that manifest themselves at scales
much below the macroscale of engineering applications. A typical example is shale, the transverse isotropic sealing formation
of most hydrocarbon bearing reservoirs. By means of a closed loop approach of microporomechanics modeling, calibration and
validation of elastic properties at multiple length scales of shale, we show that the nanogranular nature of this highly heterogeneous
material translates into a unique poroelastic signature. The self-consistent scaling of the porous clay stiffness with the
clay packing density minimizes the anisotropy of the Biot pore pressure coefficients; whereas the intrinsic anisotropy of
the elementary particle translates into a pronounced anisotropy of the Skempton coefficients. This new microporoelasticity
model depends only on two shale-specific material parameters which neatly summarize clay mineralogy and bulk density, and
which makes the model most appealing for quantitative geomechanics, geophysics and exploitation engineering applications. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
