A Stabilized Litho Density Tool LWD spectral density well log was run by Sperry-Sun in a well containing a 100% water-bearing clean rock from 7,439 to 7,571 feet. The well was drilled with a salt water mud. The mud filtrate salinity was about 195,000 ppm NaCl. The log results appear valid and are tabulated in the data table below. Environmental corrections are not needed. This is a clean, non-shaly rock made of sandstone or limestone or combination of sandstone and

limestone.

Please do the following:

a) Determine lithology for each zone. If the lithology is a combination of sandstone and limestone, calculate the percentage of each mineralogy.

b) Determine porosity for each zone.

c) Calculate average porosity over the depths 7,439 to 7,571 feet.

Spectral Density Log Data:

Zone Top (ft)	Zone Bottom (ft)	b (g/cm3)	Pe (b/e)
7,439	7,490	2.404	2.800
7,490	7,513	2.646	5.024
7,513	7,559	2.404	4.722
7,559	7,571	2.402	1.749