GEOPH424 Midterm: GEOPHYS 424 UofA midterm Exams 424Midterm 2010
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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 = 6 points) The pore space of a sandstone is saturated with salt water , salinity = 10g per litre. The rock has isolated pores and a porosity of 1% The pore space is 90% saturated with the saltwater. The rock grains have a resistivity of 1000 m (a) use archie"s law to calculate the resistivity of the sandstone (b) comment on your answer to (a) (4 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.
