Geomechanics and Petrophysics

PETE 522 Geomechanics and Petrophysics of UHR (2024) Dr. Arshad Raza (3-0-3) Homework No. 4 1. Find effective vertical and horizontal stress along with the depth for the figure shown below. Please note that the rock layers are ASSUMED TO BE DRY! Ground Surface Overburden: 4100 ft thick;  = 0.27 Density: 1.02 psi/ft; Cohesion c = 830 psi; phi = 32 degrees Reservoir thickness: 2300 ft;  = 0.34; Density: 0.95 psi/ft; Cohesion c = 1250 psi; phi = 28 degrees Total Depth=6400 2. Plot the profile (lines showing the variation) for total vertical and Horizontal stresses as well as for effective vertical and Horizontal stresses for the figure shown below. Ground Surface Limestone layer 2200 ft. thick Density: 0.95 psi/ft;  = 0.333 Shale layer 2300 ft. thick Density: 1.05 psi/ft;  = 0.25 Pore pressure = 1150 psi;  = 0.85 Limestone layer 3000 ft. thick Density: 1.1 psi/ft;  = 0.2 Pore pressure = 2600 psi;  = 0.9 Total Depth: 7500 ft