geochemistry and sulfide mineral paragenesis in … · in the utica and marcellus are widespread....
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GEOCHEMISTRY AND SULFIDE MINERAL PARAGENESIS IN
MARCELLUS SUBGROUP AND UTICA FORMATION GAS SHALE INTERVALS
Bruce Selleck
Department of Geology Colgate University
Susie Boote, Mike Carbone, Rob Bickhart, Jacky Baughman, Ali MacNamee,
Dave Linsely, Diane Keller, Brian Slater
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• Well cuttings - handling and disposal
• Potential sulfide/metal leachate • Bulk mineralogy - XRD
• Major and trace element geochemistry - XRF
• Leachate studies – solute chemistry
• Sulfide mineral paragenesis – SEM/EDS
Marcellus Subgroup and Utica Formation
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Marcellus Onondaga
Camillus
Helderberg
Syracuse
Oswego/Oneida/Clinton Gp.
Frankfort
Lorraine
Utica
Trenton
Black River
Beekmantown
Potsdam
Basement
Upper Hamilton Gp.
Larkin #1 Well – Madison County, NY
Upper Hamilton Group and overlying units – well cuttings and outcrop
Marcellus Subgroup – outcrop, quarry, well cuttings Utica Formation – outcrop, Mohawk Valley core (NYS Museum)
dep
th in
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Approximate western limit of Taconic overthrust
Adirondack Massif
Utica outcrop
Matejka core and cuttings
74NY-8 Core
Cherry Valley
Oriskany Falls
Marcellus outcrop
Clockville
Fayette
Lake Ontario
PA
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Marcellus (right)
Onondaga
Camillus
Helderberg
Syracuse
Oswego/Oneida/Clinton Gp.
Frankfort
Lorraine
Utica
Trenton
Black River
Beekmantown
Potsdam
Basement
Upper Hamilton Gp.
Tioga Bentonite
Union Springs/Bakoven Cherry Valley
Oatka Creek
Onondaga/Seneca
Larkin #1 Well – Madison County, NY
(depths in feet)
Marcellus samples from this interval
“Upper Hamilton”
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Quartz 26 43
Feldspar 2 4
Clays 21 47
Calcite 41 3
Dolomite 2 1
Pyrite 3 1
Other 5 1 Marcellus/Union Springs (n=31)
TOC – 0.3 – 3.8%
Upper Hamilton/Upper Devonian (n=21)
TOC – 0.2-0.8%
Marcellus/ Union Springs
Upper Hamilton/ Upper Devonian
Quantitative XRD - modal mineralogy (%) • RockJock (USGS) data reduction • Lower Marcellus – calcite-rich • Lower Marcellus – pyrite-rich
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0.01
0.10
1.00
10.00
100.00
SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5
Major Elements vs North American Shale Composite (NASC)
CQ-1
CQ-2
CQ-3
CQ-4
CQ-5
CQ-6
CQ-7
SST-1
OKF-40
OC-1
OC-2
Relative to NASC • Marcellus/Union Springs is Ca – rich (calcite) • Slightly enriched in Fe, P
(representative Marcellus/Union Springs samples)
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0.01
0.10
1.00
10.00
100.00
Cr Ni Cu Zn Ga Rb Sr Y Zr Nb Ba Ce Ta Pb
Trace elements vs. North American Shale Composite (NASC)
CQ-1
CQ-2
CQ-3
CQ-4
CQ-5
CQ-6
CQ-7
SST-1
OKF-40
OC-1
OC-2
Relative to NASC • Marcellus/Union Springs is enriched in Ni, Cu, Zn, Sr (calcite) • Slightly enriched in Pb
(representative Marcellus/Union Springs samples)
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Leachate from artificial soil systems: Rainwater added to grass- soil-crushed rock system Leachate sampled as shown Control = granitic aquarium gravel + fiberglass mesh HTAP = Hamilton, NY municipal tapwater
Marcellus/Union Springs, Upper Hamilton Group well cuttings leachate
• TDS ~1000 ppm after 180 days • pH ~ 9 after 180 days • carbonate mineral-buffered
(from Bickhart, et al 2012)
Leachate
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• Pb, Zn and Cu in leachate decrease (buffering of pH?) with time • U in leachate increases (solubility of U minerals in + Eh setting?) • (Metals analysis by Test America)
Mobile Metals Analysis: Uranium
(from Bickhart, et al 2012)
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Marcellus
Onondaga
Camillus
Helderberg
Syracuse
Oswego/Oneida/Clinton Gp.
Frankfort
Lorraine
Utica
Trenton
Black River
Beekmantown
Potsdam
Basement
Upper Hamilton Gp.
Larkin #1 Well – Madison County, NY
Black River
Trenton
Trenton/Rust-Steuben
Utica-Flat Creek
Utica-Indian Castle
Lorraine
(depths in feet)
Selleck/Colgate – 8/2012
Most Utica samples from this interval
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Marcellus/Union Springs (n=31)
TOC – 0.3 – 3.8%
Utica/Flat Creek (n=27)
TOC – 0.4-2.7
Quartz 26 13
Feldspar 2 2
Clays 21 17
Calcite 41 56
Dolomite 2 8
Pyrite 3 1
Other 5 3
Marcellus/ Union Springs
Utica/Flat Creek
Utica/Flat Creek (n=16)
TOC – 0.4-1.9% Utica/Flat Creek
• calcite-rich • relatively lower % pyrite
Quantitative XRD - modal mineralogy (%)
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Relative to NASC* Utica/Flat Creek : • is Ca-enriched (carbonates) • slightly Fe, P –enriched (like Marcellus/Union Springs)
*
*North American Shale Composite
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Relative to NASC, Utica/Flat Creek: • Sr-enriched (calcite) • not enriched in Ni, Cu, Zn, Pb (unlike the Marcellus/Union Springs)
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Sulfide mineral paragenesis Marcellus/Union Springs
Early framboidal pyrite Coarsely crystalline ‘later’ pyrite Both reworked as clastic particles Coarse pyrite replacement of carbonate bioclasts; concretionary segregations Other sulfides – sphalerite (common); chalcopyrite (present), galena (rare)
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Pyrite framboids preserve porosity
Marcellus/Union Springs
SE
BSE
BSE
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Left: flattened algal cysts and bioclasts Below left: Bitumen (algal cyst?) with reworked sulfide particles Below: Vertical bitumen (dead oil) vein marking petroleum pathway in pyrite- and organic-rich carbonate mudstone.
Marcellus/Union Springs
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Left and below left: sphalerite filling algal cysts Below: Pyrite and sphalerite, plus ‘anthraxolite’ line bitumen (dead oil) ‘tube’
Marcellus/Union Springs
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mineralized dilatent voids on bedding-plane fault surface calcite + aligned saddle dolomite, bitumen + calcite in 2-layer vein with quartz at layer boundary
calcite + dolomite , bitumen + calcite in 2-layer mineralized vein
Extension fractures in carbonate beds, Union Springs, Oriskany falls quarry
Marcellus/Union Springs
No sulfides in veins!
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0.2 mm 0.2 mm
4 mm
4 mm
veins fill extension fractures in carbonate bed - two generations of calcite cement + dolomite + quartz + bitumen
bitumen layer with calcite-filled shrinkage void intersects calcite vein; note brown staining of first-generation calcite cement
2 generations of calcite in vein; early generation stained by disseminated hydrocarbon; second generation clear and associated with high-reflectance (hi-R) bitumen (‘anthraxolite”)
Marcellus/Union Springs
No sulfides in veins
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0.1 mm
0.1 mm
0.1 mm
high-R bitumen fills void space between first and second generation calcite
dissolution surface decorated with high-R bitumen separates first and second generation calcite
dissolution surface separating first and second generation calcite; note hydrocarbon inclusions and twinning in first generation calcite on left
0.1 mm
note twinning of first generation calcite; lack of twinning in later clear calcite
Marcellus/Union Springs
No sulfides in veins!
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Utica/Flat Creek
Left: pyrite framboids and microcrystalline pyrite mass, coarser pyrite crystals; calcite cement fills organic fragment (graptolite?) Below left: pyrite framboids, microcrystals and reworked(?) pyrite clasts; barite Below: coarsely crystalline pyrite mass
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Utica/Flat Creek
Sand injectite Left and below left: Microcrystalline pyrite, coarser pyrite, pyrite clasts(?), quartz, feldspar, carbonate and apatite grains, bioclasts. Below: Pyrite partially replaces biogenic (?) apatite; pyrite framboids, microcrystals and grains
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Summary:
Marcellus/Union Springs: • enriched in Ca, P, Fe relative to NASC; also Sr, Ni, Cu, Pb, Zn
• carbonate-buffered
• sulfides include pyrite, sphalerite, galena, chalcopyrite
• pyrite framboids and coarser crystals reworked as clasts
• pyrite framboids preserve porosity
• sulfides rarely mobilized in vein systems related to décollement
Utica/Flat Creek: • enriched in Ca, P, Fe, Sr, relative to NASC; not Cu, Pb, Zn
• sulfides other than pyrite rare; found in late veins
• pyrite framboids and coarser crystals reworked as clasts
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Organic-rich mudrocks of the Utica Formation (Upper Ordovician) and Marcellus Subgroup (Middle Devonian) are sources of natural gas and related liquids in the Appalachian Basin. Sulfide mineralization and associated enrichment of certain trace metals in the target intervals in the Utica and Marcellus are widespread. Sulfide mineral distribution controls important rock properties including fracturing behavior, porosity and permeability, and potential metal/acid leachate from well cuttings. Whole-rock major and trace element chemistry, bulk mineralogy from X-ray diffraction, and SEM-EDS analyses of outcrop, core and cutting samples of the Flat Creek Member of the Utica Formation, and Union Springs Formation of the Marcellus Subgroup reveal a variety of sulfide mineral species, and paragenetic histories. In the Flat Creek Member (Utica), early diagenetic framboidal pyrite is widespread. Burial recrystallization produced coarser, blocky pyrite in the mudrock matrix. Other sulfide minerals, including sphalerite and minor galena, are rarely observed in mudrock, but present and associated with coarse pyrite in carbonate-sulfide veins. Flat Creek Member sulfide-carbonate veins often contain aromatic hydrocarbons, and are related in time to fluid hydrocarbon generation. Later, apparently higher-temperature carbonate veins lack sulfides, but contain methane fluid inclusions. In the Union Springs Formation (Marcellus), early framboidal and coarser, blocky pyrite are also common, and are accompanied by abundant sphalerite in some mm-scale laminae and flattened concretionary masses. Sphalerite occurs as equant to irregular-blocky aggregates of the same size as detrital clasts. Sphalerite infills uncompacted algal cysts (‘Tasmanites’), suggesting a synsedimentary or early diagenetic origin. Chalcopyrite and minor galena are also relatively common, and associated with sphalerite. The common occurrence of this sulfide mineral suite suggests that Union Springs bottom waters were metal-enriched. Later carbonate veins associated with thrust fault systems in the Marcellus are generally sulfide mineral-poor, and sulfide mobility was relatively limited during fluid hydrocarbon migration and subsequent thermal over-maturation.