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OldFinalExamProblems

# OldFinalExamProblems - 1 As part of a formation evaluation...

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1) As part of a formation evaluation project, you wish to convert transit times from well logs to porosity of the reservoir as a function of depth . The project involves two wells: WD-1 and 476A3. a) For well WD-1, you have already loaded transit time data into an interactive session of Matlab in the variable tTime_WD1 . Your command window looks like this: >> tTime_WD1 = [107.1 107.6 107.2 105.1 102.5]; This formation contains a single fluid, so the transit time in the liquid t liq is a constant. You wish to invoke the function TimeToPhi in the command window to determine porosity. A listing of the m-file for the function is shown below: function porosity = TimeToPhi(transitTime) t_measured = 1e-6*transitTime; tliq = 189e-6; tmat = 55e-6; porosity = (t_measured - tmat)/(tliq - tmat); What do you type at the prompt in the command window to determine the porosities corresponding to the transit times for well WD-1? >> 5 points

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b) Well 476A3 is an appraisal well in a different formation from WD-1. In this well, the transit time in the liquid t liq varies with depth according to t liq = 310 10 - 6 z < 3700 214 10 - 6 3700 < z < 3920 185 10 - 6 3920 < z Because t liq varies, your colleague has written the following m-file to calculate porosity: function porosity2 = TimeToPhi2(transitTime,depth) t_measured = 1e-6*transitTime; tmat = 55e-6;

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