Oklahoma NW STACK: Meramec and Osage
[Source: SandRidge Energy Feb. 22, 2017 press release]
The STACK encompasses a geographic area initially developed in Oklahoma’s Canadian and Kingfisher Counties. Recently, industry activity expanded northwest into what is considered the NW STACK where SandRidge operates in Major, Woodward, and Garfield Counties with approximately 60,000 net acres prospective for the Meramec and Osage.
The STACK and NW STACK plays, while in different parts of the Anadarko Basin, share the same depositional history. As in the STACK, the NW STACK consists of Mississippian age rock with primary targets in the Meramec and Osage formations. The structure deepens from northeast to southwest, and in SandRidge’s Major, Woodward, and Garfield County areas, depth ranges from 5,800 to 12,500 feet true vertical depth (TVD), with the majority of acreage in the 6,000 to 9,000 feet TVD range. The Woodford Shale is the primary hydrocarbon source, while the organic content in the Meramec Shale provides a self-sourcing component as well. Similar to the STACK, there is an over-pressured area and normally pressured area in the NW STACK.
Since 2014, multiple operators (including SandRidge) have demonstrated encouraging initial well results in the NW STACK. The Company’s primary target in the NW STACK is the Meramec Shale, which consists of interbedded shales, sands and carbonates with thickness ranging from 50 to 160 feet. The Meramec production to date shows high oil content (greater than 40%), low water rates and total productivity consistent with an over-pressured reservoir. The Company’s secondary target, the Osage, is comprised of limestones and cherts, ranging from 450 to 1,300 feet in thickness. The Osage production is typically gassier than the Meramec with oil content greater than 20%. Significant industry activity in the NW STACK has established both the Meramec and Osage as productive reservoirs with successful wells throughout.