In situ stress state from inversion of fracturing data from oil wells and borehole image logs

An analytical method is developed that shows that the in situ stress state is often not vertical/horizontal with depth, but often has a strike slip as expected from geological processes. per presents a theory for determining the in situ stress state from multiple fracturing data and induced fractures from image logs. A solution can be obtained with a minimum of two data sets. However, using an inversion technique, a solution can be obtained with any number of data sets, as the solution is over determined. gnitude of the stresses is mainly determined from the fracturing data. Fracture information from image logs is mainly used to determine the geographic direction of the principal in situ stresses and also deviations from the horizontal/vertical direction.