A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM

Table 1

Summary of sample information.

Sample stratigraphic position	Rock type	TS^∗ porosity (%)	Analysis type	Original texture	RQ
Lithofacies 1; (top)	Silty/sandy dolomite	3%	TS, SEM, and XRD	Dolomudstone	P-M
Lithofacies 3; (middle)	Silty/sandy dolomite	2%	TS, SEM, and XRD	Dolomudstone	P-M
Lithofacies 4; (lower)	Silty/sandy dolomite	Trace	TS, SEM, and XRD	Dolomudstone	P

^∗TS: thin section; SEM: scanning electron microscopy; XRD: combined bulk and clay XRD Analysis; RQ: reservoir quality.