I just returned from a trip to Weyburn Field in Saskatchewan, Canada. Weyburn, operated by EnCana Corp., is the site of the largest full-scale, in-the-field study of CO2 storage in a commercial EOR operation. Weyburn is a huge, 50-year-old field that produces from Mississippian Midale. Original oil in place was 1.4 billion barrels; 370 million will be recovered via primary and secondary methods. The CO2 flood is estimated to add 155 million barrels of incremental oil. In addition to the well-accepted use of CO2 to aid oil recoveries, Weyburn also demonstrates the ability of old oilfields to store CO2. At the end of the commercial oil-recovery phase, some 33 million tons of industrially generated CO2 will be permanently sequestered in the Midale formation. As a yardstick, the average car emits about six tons of carbon dioxide every year. So Weyburn will eventually hold the volume of CO2 that would be saved by taking 5.5 million cars off the roads for a one-year period. This sequestration is one of the truly exciting trends in the oil industry. EOR processes can usefully employ the waste gases thrown off by industrial processes, and afterward the target oilfields can serve as secure storage containers for that gas. Many thanks to the province of Saskatchewan and the people of EnCana for their warm hospitality and enlightening visit. --Peggy Williams, Senior Exploration Editor, Oil and Gas Investor pwilliams@hartenergy.com