One basin, one play, a lot of activity.
North Dakota's oil and gas industry is almost entirely the Williston Basin, and almost entirely the Bakken / Three Forks play. What was a minor producer in the 1990s became one of the most prolific oil plays in US history after horizontal drilling and hydraulic fracturing unlocked the basin's tight shale reservoirs in the mid-2000s.
Activity is concentrated in a handful of western North Dakota counties: McKenzie, Mountrail, Dunn, and Williams. Within those counties, horizontal wells are drilled from multi-well pads targeting the Middle Bakken and Three Forks formations, typically at depths around 10,000 feet.
North Dakota mineral ownership has unique characteristics. Many interests trace to homestead-era land grants, and the state has a high concentration of non-resident mineral owners — people who inherited rights from family who homesteaded but never lived on the land themselves. If that describes your situation, you are not alone.