Analytical results from samples collected during coal-bed methane exploration drilling in Caldwell Parish, Louisiana

Warwick, Peter D.; Breland, F. Clayton; Hackley, Paul C.; Dulong, Frank T.; Nichols, Douglas J.; Karlsen, Alexander W.; Bustin, R. Marc; Barker, Charles E.; Willett, Jason C.; Trippi, Michael H.

doi:10.3133/ofr20061213

Cited by 5 publications

(3 citation statements)

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“…Microbial oxidation of hydrocarbons (C 1 -C 3 ) and inputs of thermogenic gas could have also altered d 13 C-CH 4 values of gases across the regional transect. Previous research conducted on oiland coal-associated gases of the Paleocene-Eocene Wilcox Group in central Louisiana suggests that the gas is both biogenic and thermogenic in origin, with biogenic methane likely overprinting previously migrated thermogenic gas (Warwick, 2004;Breland and Warwick, 2005;Warwick et al, 2005Warwick et al, , 2006Warwick et al, , 2008McIntosh et al, 2010).…”

Section: Regional Differences In Environmental Conditions and Methanomentioning

confidence: 97%

“…In general, Wilcox Group coals are thickest in the lower Wilcox and increase in thermal maturity with depth. Lignite is found at depths of less than 107 meters, while Wilcox Group coals reach a rank of high volatile C bituminous around 1675 m depth (Warwick et al, 2006. Well-logs show that there are continuous and discontinuous coal beds throughout the stratigraphic area that was sampled for this study (SONRIS, http://sonris.com/dataaccess.asp).…”

Section: Organic Substrates In the Wilcox Groupmentioning

confidence: 98%

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Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Shelton

McIntosh

Warwick

et al. 2014

Applied Geochemistry

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Section: Regional Differences In Environmental Conditions and Methanomentioning

confidence: 97%

Section: Organic Substrates In the Wilcox Groupmentioning

confidence: 98%

Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Shelton

McIntosh

Warwick

et al. 2014

Applied Geochemistry

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“…In north Louisiana and southcentral Mississippi, the depth to Wilcox coalbeds ranges from 299 to 1676 m (980 to 5500 ft), and individual coalbeds have a maximum thickness of about 6 m (20 ft) . In north Louisiana, Wilcox Group coal rank ranges from subbituminous C to high volatile C bituminous at depths from 300 to 1680 m; ranks are based on the American Society for Testing and Materials (ASTM) Parr Formula (ASTM, 2005), (Breland and Warwick, 2005;Warwick et al, 2006bWarwick et al, , 2007Warwick et al, , 2008. Thermally mature gas, which may have migrated along faults through the Wilcox coal interval, is mixed with biogenic gas in some areas .…”

Section: Introductionmentioning

confidence: 99%

Pore characteristics of Wilcox Group Coal, U.S. Gulf Coast Region: Implications for the occurrence of coalbed gas

Swanson

Mastalerz

Engle

et al. 2015

International Journal of Coal Geology

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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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Analytical results from samples collected during coal-bed methane exploration drilling in Caldwell Parish, Louisiana

Cited by 5 publications

References 0 publications

Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Pore characteristics of Wilcox Group Coal, U.S. Gulf Coast Region: Implications for the occurrence of coalbed gas

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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Analytical results from samples collected during coal-bed methane exploration drilling in Caldwell Parish, Louisiana

Cited by 5 publications

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Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Fate of injected CO 2 in the Wilcox Group, Louisiana, Gulf Coast Basin: Chemical and isotopic tracers of microbial–brine–rock–CO 2 interactions

Pore characteristics of Wilcox Group Coal, U.S. Gulf Coast Region: Implications for the occurrence of coalbed gas

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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Product

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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