Homework NO.4 PGEG 401 Petrophysics & Logging 2017Fall 12.2 Figure 12.25 is a sh

Question

Homework NO.4 PGEG 401 Petrophysics & Logging 2017Fall 12.2 Figure 12.25 is a short section of the LDT(Litho-Desity Tool) log in the carbonate section of the simulated reservoir model. 12.2.1 From a knowledge of the density curve alone, what ranges of porosity would you ascribe to the seemingly uniform layer from about 12,490-12,540 ft? 12.2.2 By including the Pe measurement, could you refine your porosity estimate? What new average value would you estimate it to be? (hint: find out the Pe values for common rocks from lecture notes slide 31 &32) 12.2.3 What proportion of dolomite and limestone does the matrix seem to be? If not constant, what is the range of mixtures?

Explanation / Answer

12.2.1) from the log the Pe value from 12490 to 12540 ft is 5-6 and the lithology for is value is limestone and the porosity for the limestone is 5-10%.

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