17 July 2018
The Importance of Overburden Stress Path in Assessment of Stress Dependence for 4D Applications. In time-lapse (4D) seismic, slow-down in the overburden is often seen as a footprint of depletion in subsurface reservoirs. The work presented in this lecture
has demonstrated that for stress changes around the in situ stress, laboratory measured stress and strain sensitivity of a field shale core depends strongly on the stress path. Translated to the field, the stress path describes how horizontal stress
varies with changes in the vertical stress when stress arching occurs above a depleted (or inflated) site. Geomechanical simulations are needed in order to identify the correct in situ stress path for each specific field situation, but 4D data may
also provide guidelines towards the identification of the overburden stress path.
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