Gulf Coast Region

Whiting holds a total of approximately 64,500 net acres along the Gulf Coast, primarily in South Texas. The Company drilled a total of 18.3 net wells in the region during 2005 with a success rate of 88% and plans to drill additional wells there in 2006. At year-end 2005, the Gulf Coast region represented approximately 19% of the Company's production and about 7% of our total proved reserves.

Stuart City Reef Trend

Whiting operates the Kawitt, Yoakum and Word North fields along the Stuart City Reef Trend, where production comes primarily from the Edwards Limestone at a depth of approximately 14,000 feet and the Wilcox Formation at a depth of approximately 10,000 feet. A large 3-D seismic program is planned for this area in order to identify additional drilling opportunities on our acreage. Whiting holds a 100% working interest in these South Texas properties.

Frio Trend

Whiting's largest asset along the Frio Trend is the non-operated South Midway field, which contains multiple pays in the Lower Frio tight gas sands at depths of between 10,000 feet and 14,000 feet. The Company participated in the drilling and completion of nine wells in 2005 and plans to participate in another nine wells in 2006 with an average working interest of about 30%. Reserves for these Frio wells are estimated to range from approximately 300 MBOE to 1,000 MBOE with completed well costs averaging about $4.5 million.