CONCENTRATIONS (Tables)

12 Months Ended

Dec. 31, 2012

Customers from Whom We Derived 10% or More of Total Oil and Gas Revenue

The following table identifies customers from whom we derived 10% or more of our total oil and gas revenue during the years ended:

	December 31,
	2012			2011			2010
Conoco, Inc.		13	%		28	%		26	%
Hess Corporation		(a	)		(a	)		11	%
Phillips 66 Company		18	%		(a	)		(a	)
Sequent Energy Management LP		(a	)		(a	)		10	%
Shell Trading (US) Company		41	%		46	%		40	%

(a) Less than 10 percent.