The DPHI output needs to be corrected for shale volume.

The equation is:

PHIE=DPHI - (Vclay*DPHISH)

DPHISH (DPHI shale)=0.035

Using the table below and the equation above, calculate PHIE (Vclay tied to XRD) for the depths below.

	DEPTH	Vclay	DPHISH
A	11305	0.831	.035
B	11333	0.076	.035
C	11367	0.110	.035
D	11381	0.180	.035