Thermal Maturity Data Used by the U.S. Geological Survey for the U.S. Gulf Coast Region Oil and Gas Assessment

Dennen, Kristin O.; Warwick, Peter D.; McDade, Elizabeth Chinn

doi:10.3133/ofr20101072

Cited by 1 publication

(5 citation statements)

References 13 publications

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“…The lower Wilcox Group coal sample LA-3 is dominated by huminite group macerals with minor amounts of inertinite and liptinite (Table ). Petrographic information is not available for samples LA-1 and LA-2, but huminite reflectance data are available from other samples collected from the lower Wilcox Group at the same mine, and nearly identical location and depth . Based on huminite reflectance (or vitrinite reflectance in the case of sample OH-1), samples LA-1 and LA-2 are lignite, sample LA-3 is subbituminous B, and sample OH-1 is high volatile B bituminous using the classification scheme of Teichmüller .…”

Section: Resultsmentioning

confidence: 99%

“…58 Petrographic information is not available for samples LA-1 and LA-2, but huminite reflectance data are available from other samples collected from the lower Wilcox Group at the same mine, and nearly identical location and depth. 39 Based on huminite reflectance (or vitrinite reflectance in the case of sample OH-1), samples LA-1 and LA-2 are lignite, sample LA-3 is subbituminous B, and sample OH-1 is high volatile B bituminous using the classification scheme of Teichmuller. 61 These results generally are consistent with coal rank determined from the Parr formula (Table 1).…”

Section: Energy and Fuelsmentioning

confidence: 99%

“… a Values for mean vitrinite reflectance are from Dennen et al, and measured on samples collected from the same location (Oxbow mine, Red River Parish, Louisiana) during another site visit. b This value corresponds to an R max measurement, which, at this level of thermal maturity, should approximate an R 0 value because there is no significant anisotropy in the vitrinite. c Values from Hackley and Kolak . Other studies , report the following results (MMF basis) from a separate petrographic analysis of sample OH-1: 82.5% vitrinite, 8.4% liptinite, 9.1% inertinite.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…19 In this study, the sample set consisted of three coal block samples and one coal core. These samples 39 and measured on samples collected from the same location (Oxbow mine, Red River Parish, Louisiana) during another site visit. b This value corresponds to an R max measurement, which, at this level of thermal maturity, should approximate an R 0 value because there is no significant anisotropy in the vitrinite.…”

Section: ■ Introductionmentioning

confidence: 99%

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Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture

et al. 2015

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To investigate the potential for mobilizing organic compounds from coal beds during geologic carbon dioxide (CO 2 ) storage (sequestration), a series of solvent extractions using dichloromethane (DCM) and using supercritical CO 2 (40°C and 10 MPa) were conducted on a set of coal samples collected from Louisiana and Ohio. The coal samples studied range in rank from lignite A to high volatile A bituminous, and were characterized using proximate, ultimate, organic petrography, and sorption isotherm analyses. Sorption isotherm analyses of gaseous CO 2 and methane show a general increase in gas storage capacity with coal rank, consistent with findings from previous studies. In the solvent extractions, both dry, ground coal samples and moist, intact core plug samples were used to evaluate effects of variations in particle size and moisture content. Samples were spiked with perdeuterated surrogate compounds prior to extraction, and extracts were analyzed via gas chromatography−mass spectrometry. The DCM extracts generally contained the highest concentrations of organic compounds, indicating the existence of additional hydrocarbons within the coal matrix that were not mobilized during supercritical CO 2 extractions. Concentrations of aliphatic and aromatic compounds measured in supercritical CO 2 extracts of core plug samples generally are lower than concentrations in corresponding extracts of dry, ground coal samples, due to differences in particle size and moisture content. Changes in the amount of extracted compounds and in surrogate recovery measured during consecutive supercritical CO 2 extractions of core plug samples appear to reflect the transition from a water-wet to a CO 2 -wet system. Changes in coal core plug mass during supercritical CO 2 extraction range from 3.4% to 14%, indicating that a substantial portion of coal moisture is retained in the low-rank coal samples. Moisture retention within core plug samples, especially in low-rank coals, appears to inhibit accessibility of supercritical CO 2 to coal matrix porosity, limiting the extent to which hydrocarbons are mobilized. Conversely, the enhanced recovery of some surrogates from core plugs relative to dry, ground coal samples might indicate that, once mobilized, supercritical CO 2 is capable of transporting these constituents through coal beds. These results underscore the need for using intact coal samples, and for better characterization of forms of water in coal, to understand fate and transport of organic compounds during supercritical CO 2 injection into coal beds. ■ INTRODUCTIONThe physical properties of coal have important applications to quantifying the potential for hydrocarbon generation, retention, and expulsion from coal beds, understanding interactions of injected CO 2 with coal during geologic CO 2 storage (sequestration), and recovering hydrocarbons, such as during enhanced coalbed methane recovery. Coal generally is described as a three-dimensional, cross-linked polymer containing fluid phases within network porosity, i.e., cleats (fractu...

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Section: Resultsmentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture

et al. 2015

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Thermal Maturity Data Used by the U.S. Geological Survey for the U.S. Gulf Coast Region Oil and Gas Assessment

Cited by 1 publication

References 13 publications

Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture

Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture

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Thermal Maturity Data Used by the U.S. Geological Survey for the U.S. Gulf Coast Region Oil and Gas Assessment

Cited by 1 publication

References 13 publications

Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO2 Injection into Coal Beds: Effects of Particle Size and Coal Moisture

Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO2 Injection into Coal Beds: Effects of Particle Size and Coal Moisture

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Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture

Using Ground and Intact Coal Samples To Evaluate Hydrocarbon Fate during Supercritical CO₂ Injection into Coal Beds: Effects of Particle Size and Coal Moisture