ASBOG Questions With Correct Review Solution

ASBOG Questions With Correct Review Solution Calculate the depth to a sandstone aquifer if a well is drilled at point X located 650 feet from the nearest sandstone outcrop in the N28°E direction. The sandstone strikes N62°W and dips 30°NE and outcrops in relatively flat terrain. - ANS-650(tan)30 A borehole was drilled to bedrock from the top of a west-facing ridge at an elevation of 360 feet. The bedrock is dipping east 35° under the ridge. The distance from the borehole to the bedrock outcrop at elevation 295 feet, as measured on a map perpendicular to strike, is 450 feet. Determine the depth from the borehole to the top of the bedrock. - ANS-380 feet A limestone bed strikes north and dips 60°E. The outcrop width, as measured in the dip direction on a relatively flat surface, is 450 feet. What is the thickness of the limestone? (no scale provided) - ANS- 450 sin(60) A sandstone strikes N85°W and dips 53°S. The outcrop width, as measured across relatively flat topography in the N5°E direction, is 8005 feet. What is the sandstone thickness? - ANS-8005 sin(53) A horizontal traverse made from the bottom to the top of a shale in the dip direction S25 °W measured 2150 feet. The shale is inclined at 33°. What is the thickness? - ANS-1171 feet Two points (A and B) at two different elevations lie on the same structural plane. They dip due west. What is the strike? - ANS-N-S Incipient lateral displacement across a narrow zone is often defined by the appearance of Riedel fractures on the ground. Two typical patterns of Riedel fractures are shown below. With respect to the patterns shown: - ANS-A is right-stepping and indicates left lateral movement Given a bed with an orientation of N65°W, 25°S, what is the corresponding attitude written using a right-handed azimuth convention (hint: see key terms sheet)? - ANS-