1. A shale of Cretaceous age is composed of 60% illite, 20% chlorite, and 20% pyrite. The porosity values at different depths are as follows: n equals 33.5% at 600 ft; 25.4% at 2500 ft; 21.1% at 3500 ft, and 9.6% at 6100 ft. Estimate the vertical stress at 6000 ft depth in this shale (assuming a continuous thickness of shale from the surface to depth 6000 ft and saturation with water)
1. A shale of Cretaceous age is composed of 60% illite, 20% chlorite, and 20% pyrite. The porosity values at different depths are as follows: n equals 33.5% at 600 ft; 25.4% at 2500 ft; 21.1% at 3500 ft, and 9.6% at 6100 ft. Estimate the vertical stress at 6000 ft depth in this shale (assuming a continuous thickness of shale from the surface to depth 6000 ft and saturation with water)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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1. A shale of Cretaceous age is composed of 60% illite, 20% chlorite, and 20% pyrite. The porosity values at different depths are as follows: n equals 33.5% at 600 ft; 25.4% at 2500 ft; 21.1% at 3500 ft, and 9.6% at 6100 ft. Estimate the vertical stress at 6000 ft depth in this shale (assuming a continuous thickness of shale from the surface to depth 6000 ft and saturation with water)
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