Future Tertiary Operations

Cedar Creek Anticline (CCA). CCA is the largest potential EOR property that we own and currently our largest producing property, contributing approximately 23% of our 2020 total production. Historical production from the property has primarily been from the Red River interval. The field is primarily located in Montana but extends over such a large area (approximately 126 miles) that it also extends into North Dakota. CCA is a series of 13 different operating areas on a common geological trend, each of which could be considered a field by itself. We acquired our initial interest in CCA as part of the Encore merger in 2010 and acquired additional interests from a wholly-owned subsidiary of ConocoPhillips in 2013 for $1.0 billion, adding 42.2 MMBOE of incremental proved reserves at that date. In addition to the Red River interval, CCA contains other oil-bearing intervals including Mission Canyon and Charles B. We began pursuing these additional exploitation opportunities in late 2017. We have drilled nine successful Mission Canyon exploitation wells and a successful initial test well in Cabin Creek’s Charles B formation over the last few years. We continue to evaluate the Charles B formation and believe it has characteristics that would make it a good candidate for secondary or tertiary flooding.

CCA is located approximately 110 miles north of Bell Creek Field, and our current plan is to extend the Greencore pipeline to CCA by the end of 2021, with first CO2 injection planned during the first half of 2022. During 2021, we plan to complete the 105-mile extension of the Greencore CO2 pipeline and progress facilities, well work and field development to prepare both the Cedar Hills South Unit and East Lookout Butte for initial CO2 injections in the Red River formation with additional phases of development expected to target the Interlake, Stony Mountain and Red River formations at Cabin Creek Field.

Hartzog Draw Field. We acquired our interest in Hartzog Draw Field in 2012. The field is located in the Powder River Basin of northeastern Wyoming, approximately 12 miles from our Greencore pipeline. Industry activity around this field has been increasing for the last several years, with several operators testing various formations such as the Turner, Niobrara, Shannon, Parkman and Mowry for potential development. We believe the oil reservoir characteristics of Hartzog Draw Field make it well suited for CO2 EOR in the future. The timing of development of a CO2 flood at Hartzog Draw Field is primarily dependent upon capital availability and priorities and future oil prices.

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