Sandstone Dikes in the Parachute Creek Member - … Oil Shale Symposium, 2006 Sandstone Dikes in the...
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Transcript of Sandstone Dikes in the Parachute Creek Member - … Oil Shale Symposium, 2006 Sandstone Dikes in the...
26th Oil Shale Symposium, 2006
Sandstone Dikes in the
Parachute Creek Member
Terry GulliverHydrogeologist
Norwest Applied Hydrology
Sandstone dikes
Outline
• What they are
• Occurrences
• Hydrological significance
Clastic dikes: A respectable bibliography
Diller, J.S, 1889. Sandstone Dikes. GSA Bull Vol 1, pp 411-442
P 439: “On the voyage of the Beagle in the winter of 1883-’34 Darwin observed three vertical dikes composed of fragmental material some miles up the harbor above Port Desire, Patagonia…”
“In July, 1841, Professor J.D. Dana discovered a series of sandstone dikes at Astoria, near the mouth of the Columbia River, Oregon…”
Clastic dikes in IsraelLevy et al, Geology, July 2006
Injected
Top fill
Locations in Piceance Creek Basin
Stratigraphic location
Wasatch Fmn
Uinta
Formation
Green River
Formation
Garden Gulch M
Douglas Ck M
Parachute Creek
Member
R8
R7
R6
R5
L5
R4
R3
Dikes
R1
Parachute Creek
Parachute Creek
Parachute Creek
Parachute Creek
Parachute Creek dikes in plan
C-b
Nick Stellavato, 1982
15th Oil Shale Symposium
500 ft500 ft
Piceance Creek Canyon
Piceance Creek Canyon, close up
Borehole intersection
Mineralogy
PlagioclaseAmphibole
Mica
Dolomite
Analcime
Quartz
Kspar
Clay
Quartz
Plagioclase
K-spar
Rock frags
Amphibole
Mica
Dolomite
Analcime
Chert
XRD Thin section
Clay = 75% smectite, 25% illite
Dawsonite < 0.5%
Porosity ~ 1%
Hydrological significance
• Vertical leakage
• Hydraulic testing
Relation of vertical & horizontal impacts of dikes
i
ieffective
KddK
Σ=
Lx
Rx
Lx-1
aquita
rdK = saturated hydraulic conductivityn = # dikes per sq.mileb = dike thickness
dKbnK dike
vertical..
=
Boundaries in pumping tests
Drawdown in pumping well
0
10
20
30
40
50
1 10 100 1000 10000
Time, minutes
Dra
wdo
wn,
ft
(Q 40 gpm, R 500 ft, T 300 ft2/d, S .0003)
Sandstone Dikes, Conclusion
Sandstone dikes are a fabric component to be aware of in hydrogeology in the Piceance Creek Basin
Acknowledgements: ExxonMobilShell Frontier Oil & Gas