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REFERENCE

Calculating log geomechanical propertiesGeomechanical properties calculated from well logs are called dynamical properties, and not always correlate well with statical properties measured on real lab physical core plug samples. However, they yield whole zone continuous curves (instead of a collection of sampled points at core depths) and provide useful insights to study a reservoir without using destructive rock sampling tests (in the best case, the core may not be destroyed, but it is severely altered, thus not really representing the insitu reservoir conditions). Some common equations to estimate gemechanical dynamical properties from well logs are:
GeolOil has 9 builtin function equations and correlations to compute geomechanical properties from well logs:
The figure below shows a log geomechanics panel settings to calculate vertical stress
Since gas has a lighter density than oil or water, the computation of the total vertical stress by integrating the bulk density curve can be helpful to detect gas zones. A change on its gradient (a slight slope change in the log plot) suggests the presence of gas (in gas state). In cases where there are curves for neutron porosity (after matrix lithology corrections) and calculated density porosity, the gas crossover usually corresponds with some minor change of slope or gradient on the total vertical stress log computed curve: The figure below shows the computation of Total Vertical Stress and its change of slope (gradient) around a gas zone
Another interesting geomechanical application is to compute the rock's Poisson ratio ν and compare it to its fracture porosity. As expected, the more brittle is a rock with a low Poisson's ratio ν, the more prone to detect fractures: The figure below shows in the rightmost track, a relationship between Poisson's ratio ν and fracture porosity




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