Regional Stress Distributions

Sigra has on several occasions produced regional stress distribution models based on data from numerous sources, including those undertaken using its IST overcore tool, hydrofracture testing, and borehole breakout information. This information has been interpreted using the tectonic strain model which has been found to be adequate in the majority of cases.

However in some instances the tectonic strain model is complicated by faulting. In these instances Sigra has used seismic information to examine the faulting regime and to interpret the variations in the stress regime on a regional basis.

Sigra can compare these interpretations with numerical models, which may contain faults and which are gravitationally loaded, followed by the application of representative tectonic strains. Unloading behaviour through erosion may also be modelled.

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