Rock salinity variations as earth stress indicators

Shales have recently been shown to be sensitive to both fluid and solid transmitted pressures, in the earth. The salinity principle has shown that shale porosity, fluid pressure, rock stress and water salinity exist in mechanical and thermal equilibrium. Two equations have been shown to be applicable whenever marine sands and shales are subject to variations in salinity gradients. The porosity is directly related to the effective pore pressure, which is the difference between solid and fluid transmitted stresses. The SP and density logs may be used to corroborate each other when viewed kiloscopically (on a kilometer scale). In general, 3 given equations can be used to locate faults, unconformities, and zones of high pressure. Quick checks on rock stress calculations are possible with casing collapse, sand fracturing, and thrust faulting.