Showing papers in "International Journal of Coal Geology in 2017"

TL;DR: In this paper, coal is considered as an economic source of strategically important elements, such as Ge, Ga, U, V, Se, rare earth elements, Y, Sc, Nb, Au, Ag, and Re, as well as base metals Al and Mg.

TL;DR: In this article, the authors used the Stanford-USGS SHRIMP-RG ion microprobe to determine grain-scale rare earth partitioning in a suite of 19 U.S. and international coal fly ash samples.

TL;DR: In this article, an approach by considering fluid/pore-wall interactions (surface forces) was developed to describe the phase behavior of thin water film transition into liquid condensation.

TL;DR: The characteristics of coal-derived UCs are a function of the rank and type of the coal, as well as the size of the feed coal and the combustion conditions as discussed by the authors, and the nature of UCs resulting from vitrinite is dependent upon the coal rank.

TL;DR: Li et al. as mentioned in this paper made a comparative study on the pore structure of different sedimentary facies shales developed in typical areas, China, and found that the surface area and pore volume of over-mature marine shales are in the range of 17.83-29.26% and 3.65-18.5% respectively.

TL;DR: In this paper, the pore structure characteristics of isolated organic matter and its corresponding bulk shales were investigated for five high matured marine shale samples from the Lower Silurian Longmaxi formation in south China using X-ray diffraction (XRD), total organic carbon content (TOC) tests, field emission scanning electron microscope (FE-SEM) observation and ultra-low pressure nitrogen gas physisorption.

TL;DR: Pore-evolution models from immature organic-matter (OM) -rich Barnett and Woodford mudstones were compared with models previously developed from low-maturity OM-lean Boquillas (Eagle Ford-equivalent) mudstones to investigate whether different mineralogy (siliceous vs. calcareous) exerts different catalytic and sorption effects and influences OM-pore origin and evolution as discussed by the authors.

TL;DR: In this article, the authors developed an empirical correlation to determine the total organic carbon (TOC) for Barnett and Devonian shale formations based on conventional logs using artificial neural network (ANN).

TL;DR: In this article, the influence of analytical particle size on the surface area and mesopore and micropore volume data obtained from low-pressure N 2 and CO 2 adsorption analyses in response to the crushing of coal and shale was examined.

TL;DR: Based on inorganic and organic geochemistry, organic petrography, and stable isotope geochemistry as discussed by the authors, the depositional environment and the tight oil potential of the second member of Permian Lucaogou Formation were investigated.

TL;DR: In this article, the authors reviewed the current knowledge and understanding of coal burst phenomena and identified future research needs and priorities for the coal burst management and control An enhanced understanding of the driving mechanisms is essential for delivering reliable coal burst risk management and mitigation strategies.

TL;DR: In this article, the relationship between the changes in coal mass and in microscopic functional groups was explored based on two typical reactions of hydrogen elimination and oxygen addition involved in the oxidation process, and the computational formula to find the amount of reactive hydrogen atoms in the coal matrix involved in low temperature oxidation was derived.

TL;DR: In this article, the pore morphology, type, size and specific surface area of the Wufeng-Longmaxi shale were characterized using FE-SEM, CO 2 and N 2 sorption and MICP.

TL;DR: In this article, the authors conduct spontaneous imbibition tests and measure air-oil and air-brine contact angles of nine twin core plugs from five wells drilled in the Duvernay Formation, which is a source rock located in the Western Canadian Sedimentary Basin.

TL;DR: In this article, the authors investigated the chain pillar and adjoining gateroad failure during a longwall top coal caving (LTCC) face retreat at the Majialiang coalmine located in Shanxi, China.

TL;DR: In this article, the authors examined organic macerals and solid bitumen at different thermal maturities in the New Albany Shale and found that the organic maceral type critically controls the development of secondary organic-matter-hosted pores.

TL;DR: In this article, the porosity and pore size distribution of Longmaxi shale were investigated using small-angle neutron scattering (SANS), helium pycnometry, and low-pressure gas sorption isotherm experiments.

TL;DR: Zolfaghari et al. as discussed by the authors analyzed the inorganic and organic pore size distribution of gas shale samples using the Brunuaer-Emmett-Teller (BET) analysis.

TL;DR: In this article, an NMR-based methodology was used to evaluate the change in adsorbed and non-adsorbed (free-phase) methane during the injection of CO 2.

TL;DR: In this paper, a robust correlation between Raman spectroscopy signal (expressed as the Raman band separation) and thermal maturity obtained by the vitrinite reflectance technique is presented.

TL;DR: In this article, the role of clays on water sorption (adsorption and desorption) behavior of gas shale samples was investigated. And the results indicated that spontaneous water imbibition is always faster and yields higher water saturation compared to the water adsorption process.

TL;DR: In this article, the influence of maceral composition and coal rank on CO2 and CH4 diffusion rates of 18 bituminous and sub-bituminous Australian coals was investigated.

TL;DR: In this paper, a new iterative algorithm is introduced toward integrated evaluation, prediction, and optimization of production in shale plays, the production contribution from unstimulated parts of the matrix (outside SRV) is considered, a new multi-phase productivity index is proposed, and a new mechanistic formulation is presented to describe Dynamic-Drainage-volume (DDV) for both early transient-linear flow and late compoundlinear flow regime.

TL;DR: In this article, low pressure N 2 and CO 2 adsorption experiments were performed on two low volatile bituminous coals to gain insights into mesopore and micropore characteristics and the effects of particle size, composition (mineral matter and maceral) and tectonic deformation on them.

TL;DR: In this article, the authors measured at depths from 135.9 to 1407.19m in 15 coalbed methane (CBM) development blocks in China, correlations between parameters including reservoir pressure, closed-in pressure, breakdown pressure, in-situ stress, coal permeability, and depth were determined.

TL;DR: In this paper, coal mine discharge data from coal mine drainage (CMD) sites and precipitates from CMD treatment systems throughout Pennsylvania were analyzed and the overall REY pattern of the precipitates approximate those of the CMD, but with a slight depletion in light rare earth elements.

TL;DR: Based on molecular and stable carbon isotopic composition of a total of 24 gas samples from five shale gas wells in the Fuling field, this paper analyzed the geochemical characteristics and gas origin.

TL;DR: In this paper, the authors analyzed the synergistic effect of the combination of copper oxides and cerium oxides on Hg0 oxidation, and explored the involved mechanisms, which would help obtaining maximum Hg 0 oxidation co-benefit from SCR units in coal-fired power plants.

TL;DR: In this article, the degree of hysteresis using an AHI-based approach was applied to quantify the gas-coal sorption hystresis to both methane and CO 2 on sub-bituminous and bituminous coal and on anthracite.

TL;DR: In this article, the authors combine X-ray microtomography imaging, nanoindentation testing and DEM modeling with which they can predict the rock mechanical performance at micro scale.