The attached fig shows the density tool's response obtained over a
sand/shale series.
A. Calculate the average porosity of the clean sand interval.
B. Using a matrix density of 2.65 g/cm3, calculate the average density
porosity of shales.
How does the value compare to the true porosity? Explain the difference, if
any.
From the density log shown answer the following:
A. What is the predominant lithology present in the interval shown by the
litho-density log?
B. What is the range of porosity of this lithology?
C. Describe the lithology of the thin zones marked by O's.
D. Describe the lithology of the thin zones marked by X's.