Red River Units -- Continental Resources
from various sources, including CLR 10-Ks
from various sources, including CLR 10-Ks
Montana
The Cedar Hills West unit (CHWU), in Fallon County, Montana, is contiguous to the northern portion of CHNU. As of December 31, 2007, this 7,800-acre unit contained ten horizontal producing wells and five horizontal injection wells. We operate and own a 100% working interest in the CHWU.
North Dakota
Cedar Hills North Unit
Medicine Pole Hills Unit
Data points from a presentation provided by a reader.
- Red River formation; Ordovician period; in southwestern North Dakota
- over 700 feet thick in the center of the basin, in Dunn County
- Comment: I haven't really considered Dunn County southwestern North Dakota, but I guess one could characterize it as such
- like other formations, an "upper" and a "lower" part
- the upper unit is divided into "A," "B," "C," and "D" zones --increasingly "restrictive"
- "restrictive" --> anoxic --> excellent for preservation of organic matter --> hydrocarbons
- "A" zone: laminated dolomite
- "B" and "C" zones: non-porous; overlying porous dolomite; anhydrite beds prevent loss of hydrocarbons
- "D" zone: source rock for the Red River; beds of black kerogen rich dolomite, up to 20 cm thick, up to 59% total organic carbon (TOC) [The Bakken is up to 11% TOC]
- this kerogen-rich dolomite is found throughout the Williston Basin; considered the source rock for the Red River formation
- hydrocarbons have been produced from all four layers, but particularly from "B," "C," and "D" layers
- the "B" porosity zone is particularly important: it is laterally pervasive over much of the Williston Basin; production from "B" zone in Bull Run, Williams Creek, and Cash oil fields
- upper "B" zone might be the preferred to the lower "B" zone: lower porosity, but higher permeability, higher degree of oil saturation
- in the mid-1990s, horizontal drilling tested the Red River in Bowman County; decline rates were 30% to 45% but many of the better wells had annual decline rates of 5%; natural fracks helped
- earlier it was stated that the "D" zone likely to be a source to the Red River
- in addition, the Winnipeg shale, vertically below the Red River, may also be a source rock for the Red River
- at depths of 9,000, the Red River is thermally mature
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