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		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences                                   
		    
		    
		        
		  
		  
		  
		
		
		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences                                   
		    
		    
		        
		  
		  
		  
		  
		
		
		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences                                   
		    
		    
		        
		  
		  
		  
		  
		
		
		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences                                   
		    
		    
		        
		  
		  
		  
		  
		
		
		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences                                   
		    
		    
		        
		  
		  
		  
		  
		
		
		uLocation 
		map 
		
		
		uRocky 
		Mountains 
		
		
		  
		
		
		uDenver 
		basin 
		
		
		  
		
		
		uSan 
		Juan basin 
		
		  
		
		
		uUinta 
		basin 
		
		
		  
		
		
		uSW 
		Wyoming 
		
		
		  
		
		
		uPowder 
		River basin 
		
		
		  
		
		
		uBig 
		Horn basin 
		
		
		  
		
		
		uWilliston 
		basin 
		
		
		uWestern 
		Canada 
		
		
		uAlaska 
		
		
		uReferences       
		  | 
		Rocky Mountains 
		Denver Basin and 
		Plains to the East and Northeast
          
            
              | 
				
				 | 
				Figure 3. Map of Dakota artesian 
				aquifer, Kansas to North Dakota. Water analyses from Darton, 
				1896, Leonard and Berry, 1961, Swenson, 1968, Barnes et al., 
				1971, McNellis, 1974, and Bayne and Ward, 1974. |  
              | 
				
				 | 
				Figure 4. Diagrammatic cross-section, 
				central Kansas to North Dakota, showing configuration of 
				“Dakota” Sandstone, potentiometric surface, and topographic 
				surface. |    
			San Juan Basin   
			Uinta Basin   
			Southwestern and 
			Central Wyoming   
			Powder River Basin 
            
              | 
				
				 | 
				Figure 12. Structure map, Powder River 
				Basin, with fields producing from Muddy Sandstone. |  
              | 
				
				 | 
				Figure 13. Southwest-northeast schematic 
				cross-section, Power River Basin, showing position of abnormal 
				pressures in the basin. |  
              | 
				
				 | 
				Figure 14. Map of Powder River Basin, 
				with areal extent for top of overpressures near -4000 ft and 
				extent for top of overpressures shallower than -4000 ft.  |  
              | 
				
				 | 
				Figure 15. Map of Powder River Basin, 
				with areal extents of overpressures and underpressures in Lower 
				Cretaceous formations and overpressures in both Upper and Lower 
				Cretaceous formations. |  
              | 
				
				 | 
				Figure 16. Detail map for extents of 
				underpressured and overpressured Lower Cretaceous formations, 
				Powder River Basin. |  
              | 
				
				 | 
				Figure 17. Salinity, pressure 
				compartments, and thickness of Muddy Sandstone, northeast Powder 
				River Basin. |    
			Big Horn 
			Basin and South- Central Montana 
            
              | 
				
				 | 
				Figure 18. Pressure distribution, 
				Tensleep Sandstone, Big Horn Basin.  |  
              | 
				
				 | 
				Figure 19. Structure map, Phosphoria 
				Formation, Big Horn Basin, as location map of Cottonwood 
				Creek field (Figure 20). |  
              | 
				
				 | 
				Figure 20. Structure map, Cottonwood 
				Creek field, on Phosphoria Formation, showing outline of 
				Cottonwood Creek fluid compartment. |  
              | 
				
				 | 
				Figure 21. Tectonic elements, 
				south-central Montana, as location map for Dry Creek field 
				in cross-section in Figure 22. |  
              | 
				
				 | 
				Figure 22. Schematic cross-section, 
				south-central Montana, showing normal pressures across Nye 
				Bowler Fault and potentiometric surface that is the same as 
				topographic elevation at Dry Creek field. |    
			Williston Basin 
            
              | 
				
				 | 
				Figure 23. Pre-Devonian paleogeologic 
				map, Rocky Mountains and environs (after Loucks, 1977). |  
              | 
				
				 | 
				Figure 24. Pre-Upper Devonian 
				paleogeologic map, Rocky Mountains and environs (after Loucks, 
				1977). |  
              | 
				
				 | 
				Figure 25. Generalized stratigraphic 
				chart, Williston Basin, with positions of underpressures, 
				overpressures, and normal pressures. |  
              | 
				
				 | 
				Figure 26. Structure map, on base of 
				Mississippian, Williston Basin, with southern limit of the 
				Bakken Formation and area of overpressures (after Meissner, 
				1978).  |  
              | 
				
				 | 
				Figure 27. Map of potentiometric 
				surfaces, Devonian Dawson Bay Formation. |  
              | 
				
				 | 
				Figure 28. Map of potentiometric 
				surfaces, along with general water character, Silurian Interlake 
				and Siluro-Ordovician Stonewall formations. |  
              | 
				
				 | 
				Figure 29. Map of potentiometric 
				surfaces, along with area of low-permeable strata, Ordovician 
				Red River Formation. |  
              | 
				
				 | 
				Figure 30. Map of the Dakotas and 
				eastern Montana, showing of the boundary in the Red River 
				Formation that separates potentiometric surface of +1100 feet 
				and pressure gradient of 51.2 psi/100 feet, to the east and 
				northeast, from the potentiometric surface of +2400 feet and 
				pressure gradient of 45 psi/100 feet, to the west and southwest.
				 |  
              | 
				
				 | 
				Figure 31. Schematic cross-section 
				showing the positions of the different types of water in the Red 
				River Formation, along with associated potentiometric surfaces 
				and pressure gradients. |  
              | 
				
				 | 
				Figure 32. Map of potentiometric 
				surface, Ordovician Winnipeg Sandstone (from Paterson, 1971, in 
				part). 
				
				Click to view in sequence maps of 
				potentiometric surfaces (Figures 27, 28, 29, 32) |  
              | 
				
				 | 
				Figure 33. Structure map and 
				pressure-depth profile, Sanish oil pool, Antelope Field, 
				McKenzie County, North Dakota. Sanish Sandstone, a member of the 
				Devonian Three Forks Formation, is overpressured. |    
			Western Canada 
			Alaska 
            
              | 
				
				 | 
				Figure 39. Generalized cross-section of 
				Cook Inlet Basin, showing position of overpressures. |  
              | 
				
				 | 
				Figure 40. Map of Copper River 
				sedimentary province, where cross-section in
				Figure 41 is located. |  
              | 
				
				 | 
				Figure 41. Generalized cross-section, 
				Copper River Basin, showing position of overpressured 
				compartment, from which fluidized rock material, mainly shale, 
				and high- pressured water with minor hydrocarbons are being 
				ejected and venting at the surface to form a mud volcano. The 
				rising, high-pressured mixture may pressure-up any shallow, 
				permeable beds encountered, thereby locally complicating 
				recognition of the layered arrangement of hydraulic systems.  |  
		Bayne, C.K.; and J.R. Ward, 1974, Geology and hydrology 
		of Rice County, central Kansas: Kansas Geological Survey Bulletin, no. 
		206, pt. 3, 17 p. 
		Bayne, C. K., P.C. Franks, and W. Ives, Jr., 1971, 
		Geology and ground-water resources of Ellsworth County, Central Kansas: 
		Kansas Geological Survey Bulletin, no. 201, 84 p. 
		Darton, N. H. (1896) 
		Preliminary report on artesian waters of a portion of the Dakotas. 17th
		Annual Rept., U. 
		S. Geological Survey, v. p. 609-694.  
		Leonard, A.R., and D.W. Berry, 1961, Geology and 
		ground-water resources of southern Ellis County and parts of Trego and 
		Rush counties, Kansas: Kansas Geological Survey Bulletin 149, 156 p. 
		Loucks, Gerald G., 1977, 
		Geologic History of the Devonian Northern Alberta 
		to Southwest Arizona, in Rocky Mountain Thrust Belt Geology and 
		Resources: WGA 29th Annual Field Conference Guidebook, p. 119-134 
		 
		McNellis, J.M., 1973, Geology and ground-water resources 
		of Rush County, central Kansas: Kansas Geological Survey Bulletin, no. 
		207, 45 p. 
		Meissner, F.F., 1978, Patterns of source-rock maturity in 
		non-marine source rocks of some typical western interior basins in 
		non-marine Tertiary and Upper Cretaceous source rocks and the occurrence 
		of oil and gas in the west central U.S.: Rocky Mountain Association of 
		Geologists Continuing Education Notes, unpaginated. 
		Paterson, 
		D.F., 1971, The stratigraphy of 
		the Winnipeg Formation: Saskatchewan Department of Mineral Resources, 
		Report, v. 140, 57 p. 
		Rice, D.D., 1983, Relation of natural gas composition to 
		thermal maturity and source rock type in San Juan Basin, northwestern 
		New Mexico and southwestern Colorado: AAPG Bulletin, v. 67, p. 
		1199-1218.  
		St. John, Bill, A.W. Bally, 
		and H.D. Klemme, 1984, Sedimentary provinces of the world – hydrocarbon 
		productive and nonproductive (map with booklet): AAPG. 
		Shaughnessy, J., and R.H. 
		Butcher, 1974, Geology of Wagon Wheel 
		nuclear stimulation project, Pinedale field, Wyoming: AAPG Bulletin, v. 
		58, p. 2250-2259. 
		Smith, R.D., 1984, Gas reserves and production 
		performance of the Elmworth/Wapiti area of the Deep Basin, in 
		Elmworth: Case Study of a Deep Basin Gas Field: AAPG Memoir 38, p. 
		153-172. 
		
		Swenson, Frank A., 1968, 
		New theory of 
		recharge to the artesian basin of the Dakotas: GSA Bulletin, v. 79, p. 
		163-182. Also, Swenson, Frank A., 1968, 
		Recharge and movement of water in the Artesian Basin of the Dakotas, 
		in Black Hills Area: South Dakota, Montana, Wyoming: WGA 20th Field 
		Conference Guidebook, p. 199-207     
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