Data from the EOG McAlmond 1-5H well, sec 5, T155, R89, Mountrail Co., indicates that area is east of the area of oil generation, or the Continuous Reservoir as described by the USGS. The company found virtually no oil shows either in the mid-Bakken or in the shales, indicating that the shales are too shallow to have initiated generation of hydrocarbons. Background gas was only around 30 units when it should be in the thousands. The upper shale is found in this area at a subsea depth of about -6600 ft. Some better shows were found near the bottom of the lower shale, which is about 70 ft below the top of the upper shale.
What makes this somewhat surprising is that this area is only about a half dozen miles northeast of active development in the Austin area of Parshall Field, where some of the most prolific producers have been found. Since the mid-Bakken in the McAlmond well was not saturated with oil, it is appears that oil migration from the area of generation may not be as widespread as hoped. While there may be some extensive horizontal fracture systems that are capable of charging the mid-Bakken with hydrocarbons in areas beyond the area of active generation, such a system apparently doesn't exist in the immediate area of the McAlmond well.