The bulk-density measurement needs to be converted to density porosity.

The equation is:

DPHI = (RHOMA-RHOB)/ (RHOMA-RHOF)

Using the equation shown above and the calulator provided here, calculate DPHI for each depth by entering the correct values in the approriate locations.

	DEPTH	RHOB
A	11305	2.586
B	11333	2.368
C	11367	2.413
D	11381	2.490