Abstract

A study to review previous work, perform additional laboratory tests, and identify pay from well logs in the Teague-Blinebry field was performed at the New Mexico Petroleum Recovery Research Center (PRRC) a division of New Mexico Institute of Mining and Technology. Recovered core from one well and well logs from across the field were evaluated. Laboratory results included:

• Mineralogy, fracture systems, and oil stains were de-scribed for 251 ft of recovered core.
• Slabbed core scanning minipermeametry were performed on 79 samples, air permeabilities on both ends of twelve plugs, brine permeabilities on two samples, and water and carbon dioxide (CO₂) floods on two samples.
• Minimum miscibility pressure was determined to be the higher of 1010 psig or the system bubble point pressure.
• Wettability index was determined to be -0.608.

Core permeability measurements identified very low matrix permeability in the Blinebry dolomite. Regions of conductive vugs and fractures were detected. Tests indicate that even apparently filled fractures play a significant role in fluid movement. This observation is supported by effective permeability results, derived from step rate tests, of 1.15 md¯well above the average matrix permeability.

Density/neutron and induction or laterologs were used to identify pay in 16 wells with modern log suites. In order to include a greater number of wells, a procedure was adopted in which field average parameters were used with 47 sonic porosity logs from the older wells lacking density/neutron data. Net pay and original oil in place were calculated for 63 wells. Targets for potential water or CO₂ flood development are identified as the upper one-third of the Blinebry.