This area represents our most significant concentration of assets and year end 2011 estimated proved reserves of 210.3 million barrels of oil equivalent (“MMBoe”) in this area accounted for 54% of our total net proved reserves.
Our activities in the New Mexico Shelf are primarily focused in the vertical Yeso play where we have been an active driller since 2006. The Yeso assets generally produce from the Blinebry and the Paddock formations, with producing depths ranging from approximately 4,000 feet to 7,500 feet. Concho drilled our thousandth well in the Yeso this year. The pace of drilling and our existing infrastructure allow us to think of this area as a manufacturing type operation. We drilled over 400 wells in 2011 alone.
During 2011, we drilled several horizontal Yeso wells both into the Blinebry and the Paddock and we plan to drill more horizontal wells in 2012. Additionally, we continue to stretch the boundaries of what we traditionally think of as the Yeso trend, both to the North and to the West.
In addition to drilling in the Yeso play, we also had a rig running in the Lower Abo play for most of 2011. This play, which sits directly north of our Yeso acreage, is where Concho began drilling horizontal wells in 2008.
The Lower Abo is a horizontal oil play just north and northeast of the Yeso assets in Lea, Eddy and Chaves Counties, New Mexico. The Lower Abo play is found at vertical depths ranging from 6,500 feet to 10,000 feet and is being developed utilizing horizontal drilling techniques and advanced fracture and stimulation technology.