Data Analysis - Case Study 4

Custer / Roger Mills Counties, Oklahoma, USA.

Deep stratigraphic trap: Detecting gas reservoirs

Geology

• Anadarko Basin
• Target: Pennsylvanian Red Fork gas – 15,000 ft
• Hydrocarbon accumulations are trapped stratigraphically in an extensive channel system present over much of the basin

Survey Summary

• Nine GORE™ Surveys over three years included over 2,500 samples
• Reconnaissance samples: 600-800 ft grid spacing
• Detailed survey samples: 200-400 ft grid spacing
• 120 mi2 coverage

Survey Results

• Thirty wells drilled in conjunction with the information provided by the GORE™ Survey
• Of the 22 wells drilled in areas identified by GORE™ Survey as geochemically similiar to Red Fork gas: 21 produced commercial quantities of gas; one was dry
• Of the eight wells drilled in areas identified by GORE™ Survey as having no hydrocarbons: five were P&A; three were gas (however, one failed to repay completion costs)
• 87% success rate! GORE™ Survey is able to find charged areas of the sandstone channel
• Client’s net sand thickness isopach based on wells drilled post-survey