Consider a sandstone formation overlain by a limestone formation and underlain b
ID: 161200 • Letter: C
Question
Consider a sandstone formation overlain by a limestone formation and underlain by a shale formation. Consider three vertical boreholes put down at points 1, 2, 3 as shown in the attached figure.
In boreholes 1 and 2, the contact limestone / sandstone was found at an elevation of 350 ft and the contact sandstone / shale was found at an elevation of 250 ft. In borehole 3, the first contact was found at a 650 ft elevation and the second contact at a 550 ft elevation.
Assuming that the sandstone formation has constant thickness and dips uniformly throughout the geologic map.
(i) Find the strike and dip angles of the sandstone formation.
(ii) Construct the stratum contour lines of the sandstone formation.
Problem 1 Consider a sandstone formation overlain by a limestone formation and underlain by a shale formation. Consider three vertical boreholes put down at points s 1, 2, 3 as shown in the attached figure. In boreholes and 2, the contact limestone sandstone was found at an elevation of 350 ft and the contact sandstone was found at an elevation of 250 ft. In borehole 3, the first contact was found at a 650 ft elevation and the second contact at a 550 ft elevation. Assuming that the sandstone for has constant thickness and dips uniformly throughout the geologic map (i) find the strike and dip angles of the sandstone formation (ii) construct the stratum contour lines of the sandstone formation (iii) complete the geologic map by showing the contacts limestone/ sandstone and sandstone shale.Explanation / Answer
Consider a sandstone formation overlain by a limestone formation and underlain b