|
|||||
|
|
Hydro-geomechanical modelling of seal behaviour in overpressured basins using discontinuous deformation analysis |
|
| Authors: | M Rouainia H Lewis C Pearce N Bicanic GD Couples MA Reynolds |
| Institution: | aSchool of Civil Engineering and Geosciences, University of Newcastle, Newcastle NE1 7RU, UK bDepartment of Civil Engineering, University of Glasgow, Glasgow G12 8T, UK cInstitute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK |
| Abstract: | A coupled hydro-geomechanical modelling environment, developed to evaluate the coupled responses of fluid flow in deforming discontinuous media, is described. A staggered computational framework is presented, where the two simulations tools, HYDRO and DDA, communicate via the mapping of an equivalent porosity (and related permeabilities) from the rock system to the fluid phase and an inverse mapping of the pressure field. Several algorithmic and modelling issues are discussed, in particular the computational procedure to map the current geometry of the discontinuous rock blocks assembly into an equivalent porosity (and permeability) field. A generic, geometrically simple, overpressured reservoir/seal system is analysed for illustration. Further examples investigate discontinuous, fractured configurations in flexure causing a degree of spatial variability in the induced stresses. Model predictions show that the combination of hydraulic and mechanical loads causes a dilational opening of some pre-existing fractures and closure of others, with strong localisation of the modified flow pattern along wider fracture openings. |
| Keywords: | Discontinuous deformation analysis Porous media Hydro-geomechanical modelling Overpressured basins Seal failure |
| 本文献已被 ScienceDirect 等数据库收录！ | |