outcrop analog lower paleozoic hydrothermal dolomite reservoirs, mohawk valley, new york
DESCRIPTION
Fortuna Energy Inc. Outcrop Analog Lower Paleozoic Hydrothermal Dolomite Reservoirs, Mohawk Valley, New York. Richard Nyahay, Brian Slater, and Taury Smith New York State Museum. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
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Outcrop Analog Lower Paleozoic Hydrothermal Dolomite Outcrop Analog Lower Paleozoic Hydrothermal Dolomite Reservoirs, Mohawk Valley, New YorkReservoirs, Mohawk Valley, New York
Fortuna Energy Inc.
Richard Nyahay, Brian Slater, and Taury Smith Richard Nyahay, Brian Slater, and Taury Smith New York State Museum New York State Museum
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Introduction
• Trenton Black River hydrothermal dolomite reservoirs are complex and heterogeneous structural-stratigraphic-diagenetic plays
• A lot of the details are simply not resolvable with subsurface data
• Goal of this in-progress study is to use outcrop analog which can help better understand structural complexity, the links between faults, fractures, folds, rock types and diagenesis
• Will also provide excellent teaching opportunity for those interested in play
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Outcrop Analog for Black River
• Structural Analog– En echelon faults, folds, sags, scissor faults, strike-slip
faulting
• Diagenetic Analog– Dolomite only occurs around faults– Saddle dolomite in vugs and fractures– Paragenetic sequence similar (matrix dolomite/saddle
dolomite/quartz/bitumen/calcite)– Saddle dolomite-cemented breccias clearly fault-related
(not karst)– Geochemistry of dolomites is similar
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100 miles
Black RiverProducing Area
Quarry
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Outcrop occurs near Mohawk River. Regional NE-SW trending normal faults with up to 500 feet of throw only affect Utica and older rocks.
Palatine Bridge Quarry
(Fisher, 1980)
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Tribes Hill Formation is Lower Ordovician and is the upper part of the Beekmantown
The Tribes Hill is mainly composed of limestone in the Mohawk Valley
The underlying Little Falls is all dolomite and sandstone with little or no limestone
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2004 Outcrop Analog Activity
• Partially uncovered dolomite structures• Ran two 3D ground penetrating radar surveys• Uncovered major structure in lower quarry
delineated with 3D GPR• Preliminary map of the structure• Take initial aerial photographs• Presented early results at AAPG Eastern Section
meeting demonstrating value as an outcrop analog for TBR reservoirs
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Hurley and Budros, 1990
Partiallyuncovered structure
“Break”
Proportions and “break” remarkably similar to Albion Scipio
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Flipped image of Rochester 3D
En echelon dolomitized bodies in quarry exposure very similar to en echelon bodies in Rochester 3D – Talisman and East Resources
Geologists (who have seen the most 3D seismic) agreed that it looks like an excellent analog
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3-D Ground Penetrating Radar (GPR) Survey
• 3D Survey processed in a few hours
• Shows incredible amount of detail
• Cheap and relatively easy
3D Survey Area
26 m
30m
Survey Conducted by Mark Grasmueck, University of Miami with help from Dave Viggianao and NYSM
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Dolomite distribution reminiscent of CNR cartoon with massive dolomite around faults in middle of feature
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Dolomitized interval is dimmed out
Not all of “sag” is dolomitized
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Most obvious open porosity is found in partially-cemented fractures on the northern flank of the structure and in vugs
within the dolomite bodies – like many TBR reservoirs
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Vuggy porosity and saddle dolomite
TBR
Quarry
Quarry
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Dolomite-cemented breccia occurs at the tips of the structures, central portions of structures are dolomitized but mostly not brecciated
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2005 Outcrop Analog Activity
• Six cores taken
• Enhanced 3D GPR
• Better aerial photograph and refined map
• Geochemistry
• Workshop
• Begin trenching of bottom structure
• Begin clearing off the top quarry
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6
521 43
Dolomite
Dolomite
Limestone
Coring Project – Thanks to NYDOT
Some permeability in cores especially at base of Tribes Hill in dolomite
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6
521 43
Dolomite
Hole 4 in “Break” is dolomitized starting about 3 feet down after it crosses fault
Dolomite
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Hole 6 @10 ftHole 6 cuts no obvious faults and is about 18 feet away from the dolomitized trend. The Tribes Hill is 90% limestone
Limestones consist of mudstone, skeletal wackestone and skeletal packstone with abundant silty clay seams
This type of rock is generally not ideal for hydrothermal alteration
Hole 6 @ 43ft
6
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Hole 2 @16.5 ftHole 2 was drilled inside outer fault zone into limestone at surface. The core cuts two faults.
The upper 16 feet is limestone
All of the Tribes Hill is dolomitized below the second fault which is filled with coarse, porous saddle dolomite
Hole 2 @ 7ft
2
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1 inch (2.5cm)
1 inch (2.5cm)Fractures and vugs from TBR compose most of the porosity
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Hole 1 is cut by at one obvious fault. The Tribes Hill Formation is completely dolomitized.Chaotic bedding with small faults especially in upper 10 feet.
Pyrite fills small fault in Lower Tribes Hill near contact with Little Falls
Hole 1 @ 9.5ftHole 1 @ 23ft
1
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Hole 4 is cut by a fault @ 3ft.
Tribes Hill Formation is limestone above the fault and dolomitized beneath the fault and the dolomite is heavily brecciated.
This suggests that the two dolomite bodies are connected at depth
Hole 4 @ 14 ft
4
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Hole 3 was drilled into the tip which is obviously brecciated on the surface. Breccia extends down for several feet. Tribes Hill totally dolomitized.
Hole 3 @1ft
3
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Hole 5
Tribes Hill is completely dolomitized with common chaotic bedding in Hole 5 which is located in jog.
The Tribes Hill dolomite is commonly brecciated and highly pyritized.
Hole 5 @ 14ft Hole 5 @40.5ft
5
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New Map and Enhanced Aerial Photographs
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Geochemistry
δ18O values for matrix dolomite and saddle dolomite are lighter than seawater dolomites would be.
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Primary fluid inclusion homogenization temperatures range from 120-130° with average around 125C. Salinities are a
very high 26-28 wt%.
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This plot suggests that Tribes Hill and Black River samples formed from fluids that were about +2 per mil - much heavier than seawater in the Ordovician which was around –6 to –9 per mil .
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Matrix and saddle dolomites are radiogenic compared to Lower Ordovician seawater which suggests interaction with underlying
basement or feldspathic sandstones
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Geochemistry
• All of these analyses suggest that the dolomite formed from a hot (125°C), saline (26 wt%) brine that passed through underlying basement or feldspathic sandstones prior to making the dolomite
• These values are very similar to those found in the Black River reservoirs
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Core workshop and quarry fieldtrip June 7, 2005
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Trenching Begins
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Dolomite core of the structure stays wet longer than limestone
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Fractures dip away from the dolomite body and are plugged with calcite on the south side
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The dolomitized core is folded and has some open fractures – the sag here is more of a syncline than a graben
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Faults are partially cemented with dolomite, have porosity and have reverse sense of motion on near north side
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Future Trench Sites
We plan to trench key parts of structure including tips, jog, break and middle parts of features in order to better understand fault dip, type, and where dolomite and open fracture and vuggy porosity occur.
We will use this data to build a 3D structural and diagenetic model
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Working on structural analysis – after trenching we may do sandbox modeling
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Floor plans of characteristic domains
Grasmueck et al. CSL2004
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Upper quarry before and after partial cleaning
limestone
dolomite
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Upper Quarry Structures
Sag with beds dipping at 30° on both sides into structure
Sliver of limestone preserved in middle of dolomite body
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What if a vertical well was drilled right here in a TBR Field?
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Dolomitized features in upper quarry run parallel to the feature in the lower quarry
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Like lower quarry, there is porosity in vugs and fractures
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It looks like there is also matrix porosity in some of the
coarser rock types like this flat pebble conglomerate
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After first pass, it looks like there are at least two dolomite bodies, but it is bigger and more complex than lower quarry –planning to
clean it, trench it and map it in detail
limestone
dolomite
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Upper Quarry
• Lot of faulting, not all faults have associated dolomite (just like TBR play)
• Matrix, vuggy and fracture porosity• Bigger than lower quarry exposure• Will compare to lower quarry to see similarities• Needs to be cleaned• Plan to expand GPR survey and make detailed
map and take aerial photos• Also plan to cut trenches here
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Tribes Hill
Ocr =dolomite Ofw=limestone
The Tribes Hill is variably dolomitized in throughout the area- some dolomite bodies big enough to be reservoirs
TH all limestone here
dolomite
(Fisher, 1980)
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Horizontal slickensides support strike-slip faulting in the area
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Future Work• Will continue to trench structures in the lower and upper
quarry• Will try to get shallow seismic refraction line that can
image structures down to basement (probably about 400 ft)• Will finish geochemistry and petrography on dolomites • Will work to uncover other fault-controlled dolomites in
the upper quarry• Will expand 3D GPR coverage• Will make a detailed map of known existing dolomite
bodies in the quarry
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Conclusions
• The quarry feature is a great analog for the Black River Play
• The upper quarry shows similar features that formed higher in the section suggesting similar process of formation.
• Porosity so far is limited to the northern flanks.• More work and study need to be done • This is just Chapter 2 – more chapters to be
written
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• John Martin, NYSERDA Tom Mroz, NETL-DOE John Martin, NYSERDA Tom Mroz, NETL-DOE • Fortuna Energy Gareth Cross, SUNY Buffalo Fortuna Energy Gareth Cross, SUNY Buffalo • Scott Meisener, NYDOT Harold Brossman, Frey EstateScott Meisener, NYDOT Harold Brossman, Frey Estate• Greg Piascik, NYDOT Joe Santamaria, NYDOTGreg Piascik, NYDOT Joe Santamaria, NYDOT• Rose Schulze, NYSM Jim Sandor, NYSMRose Schulze, NYSM Jim Sandor, NYSM• Mark Grasmueck University of Miami• Dave Viggianao University of Miami
Acknowledgements