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Lower Cody Shale (Niobrara Equivalent) in the Bighorn Basin, Wyoming and Montana—Thickness, Distribution, and Source Rock Potential

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Lower Cody Shale (Niobrara Equivalent) in the Bighorn Basin, Wyoming and Montana—Thickness, Distribution, and Source Rock Potential 110° 109° 110° 108° 109° 107° 108° 107° R15E R20E R25ER15E R20E R35ER25E EXPLANATIONR35E EXPLANATION T T Tertiary volcanic rocks Tertiary volcanic rocks 5 NYE-BOWLER 5 NYE-BOWLER S S 0 20 40 MILES 0 20 40 MILES LINEAMENT LINEAMENT Cody Shale outcrop Cody Shale outcrop 110° 109° 108° 107° 0 20 40 KILOMETERS 0 Precambrian20 rocks 40 KILOMETERS Precambrian rocks R15E R20E R25E R35E 1,750 1,750 MOUNTAINSPRYOR MOUNTAINSPRYOR Bighorn Basin Province boundary Bighorn Basin Province boundary BEARTOOTH BEARTOOTH T EXPLANATION MOUNTAINS MOUNTAINS 5 NYE-BOWLER Eastern limit of lower memBer of Eastern limit of lower memBer of LowerS Cody Shale Mesaverde Formation (Niobrara Mesaverde Equivalent) Formation in the Bighorn Basin, 1,750 1,750 LINEAMENT Bighorn Basin Province Boundary T T 700 T Well location T Well location 9 9 9 9 Tertiary volcanic rocks MONTANA MONTANA 45° S 45° S R35E R40E S Thickness isopach,R35E in feet R40E S Thickness isopach, in feet 700 110°MOUNTAINSPRYOR 109° Cody Shale outcrop 108° 107° WYOMING R101W WYOMINGR95W R101W R95WBEARTOOTH BIGHORN Wyoming andBIGHORN <1,750 Montana—Thickness,<1,750 R25E Distribution,R35E and Source R15E R20E T T MOUNTAINS Precambrian rocks 57 57 T N N 8001,750 to 2,000 1,750 to 2,000 EXPLANATION T 5 NYE-BOWLER Well location T 9 9 MONTANA 2,000 to 2,250 S 2,000 to 2,250 Bighorn Basin Province Boundary 45° S 900 LINEAMENT0 R35E 20 40R40E MILES S T T Rock Potential 2,000 2,000 WYOMING T R101W2,250 to 2,500 R95W T 2,250 to 2,500 Tertiary volcanic rocks 55 55 55 700 55 BIGHORN 0 20 110° 40 KILOMETERS 109° 108° 107° N N T 57N 2,500 to 2,750 N 2,500 to 2,750 R90W R85W R90W R85W MOUNTAINSR15EPRYOR R20E Cody ShaleR25E outcrop R35E N 900 BEARTOOTH 550 2,750 to 3,000 2,750 to 3,000 MOUNTAINS 600 T Precambrian rocks EXPLANATION 800 650 5 NYE-BOWLER ABSAROKA ABSAROKA T 3,000 to 3,250 T 3,000 to 3,250 S Well location T T LINEAMENT Bighorn Basin Province Boundary 55 900 9 700 55 9 MOUNTAINS 3,250 to 3,500 MOUNTAINSMONTANA 3,250 to 3,500 40 MILES N 45° S N 0 R35E 20 R40E S R90W R85W 110° 109° Tertiary volcanic rocks 108° 107° 3,500 to 3,750 WYOMING R101W3,500 to 3,750 R95W 100 BIGHORN 20 40 KILOMETERS R20E R25E R35E T 0 MOUNTAINSR15EPRYOR Cody Shale outcrop 800 BEARTOOTH >3,750 57 >3,750 ABSAROKA T EXPLANATION N MOUNTAINS Precambrian rocks T 2,250 T 2,250 T T 5 NYE-BOWLER 50 50 100 50 900 50 S RANGE RANGE T T Bighorn Basin Province Boundary N N N N MOUNTAINS LINEAMENT Well location 9 9 T 1,100 T MONTANA S 0 R35E 20 40 MILESR40E S Tertiary volcanic rocks R104W R104W 55 45° 0.8 55 N WYOMING R101W R95W 2,750 2,750 N BIGHORN0.8 Frontier/Mowry/Muddy/Thermopolis R90W R85W MOUNTAINS40PRYOR KILOMETERS 750 T 100 BEARTOOTH 0 20 2,500 2,500 T T Formations outcrop 1,000 57 MOUNTAINS 50 N50 100 1.1 Precambrian rocks RANGE 1,000 N 800 N 1,100 ABSAROKA 44° 44° 850 T1.35 High-angle fault T 100 9 9 3,000 R104W 3,000 T MONTANA S 200 MOUNTAINS T ThrustR35E fault R40E S 3,750 3,750 55 45° R101W R95W 55 3,250 T 3,250 T N WYOMING BIGHORN Line of secton T T 2,750 2,750 Clark's N 3,500 45 3,500 45 T R90W R85W 45 45 1,200 Well sample point N N N N 57 44° T N Composite well sample point T Fork 1 1,200 100 . 0.8 R100W R100W 50 ABSAROKA 50 1.35 1 Outcrop sample point R105W R105W RANGE 950 R4W R4W 1,100 N 1,100 N sub-basin 1 1,100 1,000 400 300 Burial history location 1,200 200 . T R3E T R3E 1,100 1,000 100 T 1 T T T T T 55 MOUNTAINS 8 8 R104W 1.1 55 N 8 N 45 8 45 N 0 20 40 MILES N N N N 1,200 N R90W R85W R95W R95W 950 850 900 800 1 .1 0 20 40 KILOMETERS BIG TRAILS FAULT BIG TRAILS FAULT 1,000 R105W R100W 1,050 T 950 1.35 T R4W ABSAROKA 44° 50 200 OREGON 50 OWL OWL T R3E RANGE T T T T T 1,000 N N 40 T 40 T 408 40 CREEK CREEK N 8 950 MOUNTAINS N 5 N MOUNTAINS 5 MOUNTAINSN N N R1W R1W R5E R5E R5W R5W R94W R94W 950 R1E R1E R85W R85W R90W N N R90W R95W R104W 700 T T BASIN 2.0 750 400 45 BIG TRAILS FAULT 45 N N Emblem R5W R1W R1E R5E R94WR5W R90WR1W R1E R85WR5E R94W R90W R85W 850 MOUNTAINS MOUNTAINS N N N N 5 5 N N 0.6 Bench 200 T FAULT 0.8 T CREEK CREEK 40 40 OWL T T 40 40 T T 50 50 T T R100W RANGE T T R105W T 40 OWL 40OWL 44° CREEK R4W N N N 5 MOUNTAINS N Dobie R1W R5E R5W R94W R1E R85W T R90W R3E N T Creek 8 R104W 300 BIG TRAILS FAULT BIG TRAILS FAULT N 8 300 N T R95W R95W R5W R1W R1E R5E R94W R90W T NR85W MOUNTAINS N N R95W N 5 45 N 45 N N 8 8 CREEK 40 T N 40 BIG TRAILS FAULT N 8 8 T T T T 0.6 OWL R3E R3E T T R4W R4W OWL R105W R100W 44° R105W R105W T R100W R100W T R4W BIG TRAILS FAULT 40 40 T CREEK T R3E .1 N 5 T N 1 R95W 8 N N N N MOUNTAINS N 8 R1W R5E R5W R94W R1E R85W N R90W T N N 45 45 T 45 45 3,500 3,500 8 N 45 8 2,750 2,750 T T 45 R95W T T T 3,250 3,250 0.8 N R3E N T R5W R1W R1E R5E R94W R90W N R85W BIG TRAILS FAULT 3,750 3,750 MOUNTAINS N 5 N 0.6 R4W 3,000 3,000 CREEK R105W R100W 40 T R105W 40 R100W T T 44° ° 44 OWL TOWL R4W T 1,200 N T N R3E 40 T CREEK T 40 45 8 N 45 5 MOUNTAINS 8 N BIG TRAILS FAULT 2,500 2,500 T R1W R5E R5W R94W R1E R85W N R90W T N N 1,100 1,000 R95W 1,200 2,750 2,750 R95W 1,100 N 1,100 1,100 N N R104W R104W R5W R1W R1E R5E R94W R90W R85W BIG TRAILS FAULT 8 MOUNTAINS 8 N 5 N 1,200 T 44° CREEK R3E T 40 T 40 N N N N R4W OWL T T T RANGE RANGE T 1,200 OWL 50 50 R105W 50 50 R100W 40 T 40 2,250 2,250 CREEK T T T T N 5 MOUNTAINS N >3,750 >3,750 N BIG TRAILS FAULT N N 850 R1W R5E R5W R94W R1E R85W R90W 45 45 R104W R95W 750 3,500 to 3,750 3,500 to 3,750 N T T N R5W R1W R1E R5E R94W R90W R85W 700 8 950 N 1,100 8 N MOUNTAINS N MOUNTAINS MOUNTAINS 3,250 to 3,500 3,250 to 3,500 T N 950 5 N 1,000 RANGE R3E T 50 50 CREEK 40 T 40 1,000 1,000 R4W T T 3,000 to 3,250 3,000 to 3,250 T 44° T R105W R100W ABSAROKA ABSAROKA OWL 950 2,750 to 3,000 2,750 to1,050 3,000 N 1,000 N BIG TRAILS FAULT 800 900 R90W R90W R85W R85W 1,100 45 850 45 950 2,500 to 2,750 2,500 to 2,750 N N R95W N N T T MOUNTAINS N 300 55 55 N 55 55 900 R104W 300 8 2,250 to 2,500 2,250 to 2,500 T T 2,000 2,000 8 T T T 1,000 R3E ABSAROKA T N N 2,000 to 2,250 2,000 to 2,250 800 950 R4W RANGE 44° 50 50 R105W R100W T N N T 1,750 to 2,000 1,750 to 2,000 200 0.6 R90W R85W 57 57 N N N N 0.8 T T <1,750 <1,750 900 55 55 45 BIGHORN BIGHORN 45 WYOMING WYOMING R95W R95W R101W R101W 400 T T T T R104W Thickness isopach, in feet Thickness isopach, in feet 45° 45° R35E R35E R40E R40E S S S S MONTANA MONTANA 800 MOUNTAINS 1 . 1 9 9 9 9 Well location Well location N T T T T N N RANGE 850 200 50 900 50 ° ABSAROKA 44 1,750 1,750 Mesaverde Formation Mesaverde Formation 57 800 T T MOUNTAINS MOUNTAINS 0.6 T Eastern limit of lower memBer of Eastern limit of lower memBer of 0 20 700 40 KILOMETERS BIGHORN BEARTOOTH BEARTOOTH WYOMING R95W R101W 750 PRYOR PRYOR R90W R85W Bighorn Basin Province boundary Bighorn Basin Province boundary MOUNTAINS MOUNTAINS 45° R35E 1,750 1,750 900 R40E 20 0 S N S 40 MILES MONTANA N 9 55 9 Precambrian rocks Precambrian rocks 55 R104W 0 0 20 20 40 KILOMETERS 40 KILOMETERS Well location T T T MOUNTAINS Creek 800 T 100 200 300 400 LINEAMENT LINEAMENT Cody Shale outcrop Cody Shale outcrop Dobie S S N N Precambrian rocks 20 20 0 0 40 MILES 40 MILES MOUNTAINS RANGE 5 5 ABSAROKA 50 NYE-BOWLER NYE-BOWLER 50 100 Tertiary volcanic rocks Tertiary volcanic rocks BEARTOOTH T T N T FAULT T PRYOR 0.8 Cody Shale outcrop MOUNTAINS 700 Bench 0.6 57 Emblem R15E R15E R20E R20E R25E R25E EXPLANATION EXPLANATION R35E R35E T R90W R85W 0 20 40 KILOMETERS Tertiary volcanic rocks BIGHORN N WYOMING N R95W R101W 700 2.0 BASIN 109° 109° 110° 110° 107° 107° 108° 108° 55 LINEAMENT 55 45° R35E Bighorn Basin Province Boundary R40E S S 20 0 Scientific Investigations Report 2013–5138 40 MILES 200 MONTANA T S T MOUNTAINS 9 700 9 NYE-BOWLER 5 100 Well location T T EXPLANATION T 650 OREGON ABSAROKA 1.35 N 600 Precambrian rocks R15E MOUNTAINS R20E R25E R35E 100 57 550 BEARTOOTH 1 0 20 40 KILOMETERS .
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