GEOPH424 Midterm: GEOPHYS 424 UofA midterm Exams 424Midterm 2013
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Note the number of points allocated for each part. Notes and textbooks may not be used during the exam. Please hand in this exam, with your name and student number listed above. Question 1 resistivity of rocks ( total = 10 points) A sandstone reservoir has a uniform porosity of 10% Both salt water and oil are present in the pore space. Well logging measures the bulk resistivity values shown below. Estimate the fraction of the rock that is occupied by oil. (2 points) (1 point) (5 points) (2 points) Question 2 : maxwell"s equations (total = 12 points) A plane em wave with frequency, f, is travelling vertically downwards in the earth in the z-direction. The wave has an angular frequency, , and varies with time (t) as e-i t. The electric field is polarized in the x-direction. It can be shown that maxwell"s equations reduce to a single differential equation for ex.
