Anisotropic Poroelastic Modelling of Depletion-Induced Pore Pressure Changes in Valhall Overburden

The prediction of stress and strain changes in and around reservoir using numerical simulators is often based on assumption of linear elasticity before reaching yield point. However, it is known that rocks are generally ...

Depletion or injection into a reservoir implies stress changes and strains in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. To better understand ...

Petroleum production and CO2 storage induce effective stress changes and deformations in the reservoir, as well as in the overburden. This may be detected by 4D seismic monitoring due to the stress-sensitivity of the seismic ...

Elastic response of rocks often depends on the rock’s orientation, i.e., most rocks are anisotropic. In particular, shales, which are the overburden rock in most of conventional oil and gas fields, often show strong elastic ...

Fluid production from or injection into a subsurface reservoir leads to stress pressure changes inside and outside the reservoir. The overburden often consists of low permeability shale, and the undrained pore pressure ...

Since shales are the far most abundant overburden formation, understanding the geomechanical and rock physics behavior of shales is essential. We discuss a particular deep overburden shale in light of a thorough static and ...

Overburden stresses and pore pressure are altered by depletion or inflation of a subsurface reservoir, leading to seismic travel time and reflectivity changes that may be interpreted as footprints of reservoir drainage or ...

4D seismic time-shifts are induced by stress changes in the overburden as a result of depletion from or injection into an underlying reservoir. This represents a powerful technique for tracking unrecovered hydrocarbon ...

The formations above a producing reservoir can exhibit large mechanical changes, creating a risk of significant subsidence and loss of rock integrity. These changes can be monitored by time-lapse seismic acquisition, which ...