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Alteration of organic macerals by uranium irradiation in lower Paleozoic marine shales

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 239 ()

Measuring the degree of organic matter (OM) alteration caused by uranium (U) irradiation is important in the effective evaluation of the hydrocarbon p......

Detachment of coal fines deposited in proppant packs induced by single-phase water flow: Theoretical and experimental analyses

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 239 ()

Hydraulic fracturing is an effective approach to improve the productivity of coalbed methane (CBM) reservoirs. However, during hydraulic fracturing an......

Nanoindentation-enhanced screening of hydraulic fracturing fluid additives

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 240 ()

This paper describes a viable nanoindentation-enhanced technique for screening hydraulic fracturing fluid additives via quantifying the effects of roc......

Differential graphitization of organic matter in coal: Some new understandings from reflectance evolution of meta-anthracite macerals

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 240 ()

Middle Permian coal from the Yongan Coalfield, Fujian Province, China, with a maximum vitrinite reflectance (VRmax) of 5.33%?8.95%, indicating a typic......

Depositional paleoenvironment and source rock characterization across the Toarcian Oceanic Anoxic Event from the eastern Tethys, Tibet, SW China

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 243 ()

An integrated approach based on organic petrographic and geochemical proxies along with palynological and palynofacies analysis were employed using 24......

High microbial gas potential of Pleistocene lacustrine deposits in the central Qaidam Basin, China: An organic geochemical and petrographic assessment

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 245 ()

Thick Pleistocene fine-grained rocks in the central Qaidam Basin, China, are regarded as the principal source rocks for microbial gas there. Here, for......

Identification of thin-layer coal texture using geophysical logging data: Investigation by Wavelet Transform and Linear Discrimination Analysis

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 239 ()

The well log inversion has been widely applied to forecast coal texture distribution due to its effectiveness and low investment. However, most resear......

Numerical investigation of the effects of proppant embedment on fracture permeability and well production in Queensland coal seam gas reservoirs

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 242 ()

This paper introduces the development of a new predictive model in support of proppant injection in naturally fractured coal seam gas (CSG) reservoirs......

Molybdenum-uranium-vanadium geochemistry in the lower Paleozoic Alum Shale of Scandinavia: Implications for vanadium exploration

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 239 ()

This paper investigates the hyper-enrichments of molybdenum (Mo), uranium (U), and vanadium (V) in the lower Paleozoic, Alum Shale of Denmark, Sweden,......

Coupling of pipe network modelling and domain decomposition for flow in mineralised coal cores

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 245 ()

Permeability of coal is highly dependent on the effective stress, which is found to decrease exponentially as effective stress increases. To study coa......

Middle Jurassic lacustrine source rocks controlled by an aridification event: A case study in the northern Qaidam Basin (NW China)

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 242 ()

A change from a humid to an arid climate occurred during the Middle Jurassic. Information about this transitional phase is stored in two oil shales: t......

Chemical structure changes of solid bitumen during solvent swelling investigated by X-ray diffraction

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 243 ()

In this study, swelling experiments for three natural solid bitumen samples in two types of organic solvents were conducted to explore the location of......

Thermal evolution behavior of the organic matter and a ray of light on the origin of vitrinite-like maceral in the Mesoproterozoic and Lower Cambrian black shales: Insights from artificial maturation

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 244 ()

The overmature Precambrian to Lower Paleozoic marine shales from China contain relatively simple organic matter (OM) composition, which is dominated b......

Comparison of in-source solid bitumen with migrated solid bitumen from Ediacaran-Cambrian rocks in the Upper Yangtze region, China

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 240 ()

In-source solid bitumen was found in some cracks within the calcareous concretion in an overmature (Rbitumen > 3.5%) black shale of the Lower Cambr......

Problems in pore property testing of lignite: Analysis and correction

期刊: INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021; 245 ()

Due to the low coalification degree of lignite, the colloid-like properties and loose characteristics lead to low energy utilization efficiency and se......

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