Showing papers in "International Journal of Coal Geology in 2013"

TL;DR: In this article, the pore size of coal and gas shales has been investigated to determine the effect of pore sizes on the adsorption performance of coal-and gas-shales.

TL;DR: In this paper, the latest techniques for quantitative PDA including type-curve analysis, straight-line (flow-regime) analysis, analytical and numerical simulation and empirical methods are briefly reviewed, specifically addressing their adaptation for coalbed methane (CBM), tight gas (TG) and shale gas (SG).

TL;DR: The coal type refers solely to coals' depositional origin and the maceral-mineral admixture resulting from that origin, whereas coal rank refers to the changes in geochemistry and resultant changes in reflectance caused by increasing thermal maturity of the coal.

TL;DR: In this article, the authors measured the variation of CH 4 and CO 2 sorption capacities of the dry coals as a function of rank and the influence of water on the sorption properties.

TL;DR: In this paper, the U.S. Geological characterization was conducted which estimated total gas in-place and theoretical maximum CO2 storage capacity within the Marcellus Shale in the Eastern United States.

TL;DR: In this paper, the Late Permian coal in the Fusui Coalfield of southern China is characterized by high Fe-sulfide and organic sulfur contents (2.60 and 2.94% respectively).

TL;DR: In this article, the relationship between graptolite reflectance and equivalent vitrinite reflectance can be expressed by the equation: VR eqv ǫ = 0.73 R (gritolite+vitrinite-like)low R Â + Â 0.16.

TL;DR: In coal bed and shale gas, this paper showed that carbon and hydrogen isotope fractionations close to those expected for CO2 reduction can provide a better indication of the origin of the gases and the dominant metabolic pathway.

TL;DR: In this paper, the authors show that the sediment-source region and multi-stage hydrothermal fluids are the dominant influences on the mineralogical composition and elevated trace elements in coal, although seawater influence also contributed to the composition of the mineral matter.

TL;DR: In this article, a 3D micro-focus X-ray computed tomography (μCT) system was used to evaluate the modes of occurrence of the mineral matter within coal.

TL;DR: In this article, the authors improved the conventional relative permeability model for two-phase flow in porous media to describe the relative coal permeability for coal, and the effect of porosity change on relative coal is taken into account by introducing a residual phase saturation model and a shape factor as functions of permeability ratio.

TL;DR: In this article, the authors couple the recently developed Liu and Harpalani sorption-induced strain model with various permeability models to predict coalbed methane (CBM) reservoirs during primary depletion, particularly in the San Juan Basin.

TL;DR: In this paper, a preservation model within the lower oil shale layer and a productivity model was established for oil shale deposition in the Songliao Basin, and it was shown that excellent preservation is the major controlling factor for OM enrichment in the lower and upper oil shale layers.

TL;DR: In this paper, the authors present the results of changing effective stresses, in terms of confining stresses and pore pressure, incorporating the role of coal swelling with time on the flow pattern of gaseous CO 2.

TL;DR: The Truman Shepherd coal mine fire, Floyd and Knott counties, Kentucky, has been the subject of several field investigations over the last four years as discussed by the authors, where the original vents were able to be studied in addition to new vents on each subsequent trip.

TL;DR: In this paper, two coalbed methane (ECBM) core flooding experiments were conducted to observe the gas displacement process, the competitive adsorption and the effect of coal swelling and shrinkage on coal permeability.

TL;DR: In this paper, the development of sequential extraction combined with various advanced analytical techniques was performed to provide an improved understanding of the complex processes related with sulfide-rich coal waste oxidation, sequences of mineral formation, and the transport mechanisms of hazardous elements by specific neoformed soluble minerals.

TL;DR: In this paper, the authors used broad ion beam (BIB) milling to prepare low-relief polished surfaces of coal samples for high-resolution SEM imaging, in a study of the morphology and distribution of macro- and mesopores.

TL;DR: The coal seams of the South Walker Creek area in the northern Bowen Basin have a vitrinite reflectance (Rvmax) of 1.7 to 1.95 as discussed by the authors.

TL;DR: In this article, the pore structure and mineralogy of the New Albany Shale (Devonian-Mississippian) were investigated using high-pressure reaction cells with either distilled water or NaCl brine and CO2.

TL;DR: In this article, experimental CO 2 kinetic sorption data was obtained for two Australian bituminous coals over a range of pressure conditions and analysed using three different models, including unipore, bidisperse and Fickian diffusion-relaxation models.

TL;DR: In this article, the authors conducted transmission micro-FTIR spectroscopy to elucidate the macromolecular structure of well-preserved fossil palynomorphs including prasinophycean algae, megaspores, chitinozoans, and scolecodonts.

TL;DR: In this paper, a comparison of the mineral matter and trace elements in 12 pairs of run-of-mine (ROM) and clean-coal products from beneficiation plants in Santa Catarina, southern Brazil, have been carried out using low-temperature oxygen-plasma ashing, X-ray diffraction and chemical analysis techniques with the aim of evaluating the effect of coal preparation on the mineralogy and chemical composition of the final coal products.

TL;DR: In this article, a 3D numerical modeling was conducted to consider how the longwall mining affects the stress state in the border area and how the stress changes would affect future coal mining.

TL;DR: In this paper, coal seam sections in the Songzao Coalfield, SW China, are mainly high-ash, high-sulphur semianthracites with various proportions of non-kaolinite clay minerals, carbonates, feldspars, and anatase.

TL;DR: In this paper, a diffusive microbial sampler (DMS) was used to sample coal in the Powder River Basin (PRB) in southeastern Montana and northeastern Wyoming to identify coal-dependent microbial communities.

TL;DR: In this article, the evolution characteristics and mechanism of the aggregate structure of four low-rank coals during pyrolysis process were investigated by the combination of in-situ X-ray diffraction (XRD) and thermogravimetry coupled with mass spectrometry (TG/MS).

TL;DR: In this article, the effects of coal seam deformation, non-Darcy flow and anisotropic swelling on the extraction of natural gas in coal seam reservoirs are investigated through a numerical model which fully couples the interactions of coal seams deformation and aniotropic gas flow in fractures.

TL;DR: The Huadian Basin is a fault-controlled basin filled by Eocene non-marine sediments assigned to the Huadian Formation as discussed by the authors, which is subdivided from bottom to top into three members: Pyrite Member, Oil Shale Member, and Carbonaceous Shale member.

TL;DR: In this paper, a feasibility study was conducted in anaerobic microcosms containing each type of coal and amended with a nutrient solution and a methanogenic consortium of organisms enriched from formation water obtained from a coalbed methane well with a known history of biogenic gas production.