The distribution of climbing chalk on climbed boulders and its impact on rock‐dwelling fern and moss species
Sign Up to like & getrecommendations! Published in 2020 at "Ecology and Evolution"
DOI: 10.1002/ece3.6773
Abstract: Abstract Rock climbing is popular, and the number of climbers rises worldwide. Numerous studies on the impact of climbing on rock‐dwelling plants have reported negative effects, which were mainly attributed to mechanical disturbances such as… read more here.
Keywords: chalk; rock dwelling; moss species; climbing chalk ... See more keywords
Polymers and polymer-based gelants for improved oil recovery and water control in naturally fractured chalk formations
Sign Up to like & getrecommendations! Published in 2018 at "Chemical Engineering Science"
DOI: 10.1016/j.ces.2018.04.064
Abstract: Abstract Polymers and polymer-based gels are used in the oil industry to improve the oil displacement efficiency and address unwanted fluids (water and/or gas) production, respectively. In this work, existing commercial polymer and polymer-based chemicals… read more here.
Keywords: chalk; water; oil recovery; polymer based ... See more keywords
The stratigraphy of the upper Campanian Chalk of the southern English coast (Isle of Wight, Dorset), United Kingdom
Sign Up to like & getrecommendations! Published in 2021 at "Cretaceous Research"
DOI: 10.1016/j.cretres.2021.104775
Abstract: Abstract The litho- and biostratigraphy of the coastal exposures of upper Campanian chalk on the southern English coast, in east Dorset and on the Isle of Wight are described, correlated within the region and with… read more here.
Keywords: chalk; isle wight; upper campanian; succession ... See more keywords
Unraveling short- and long-term carbon cycle variations during the Oceanic Anoxic Event 2 from the Paris Basin Chalk
Sign Up to like & getrecommendations! Published in 2020 at "Global and Planetary Change"
DOI: 10.1016/j.gloplacha.2020.103126
Abstract: Abstract The Oceanic Anoxic Event 2 (OAE2, ca. 94.6 Ma) is one of the major perturbations in the global carbon cycle during the Phanerozoic. Stable carbon isotopes (δ13C) from marine and continental sedimentary environments document this… read more here.
Keywords: carbon; term; chalk; carbon cycle ... See more keywords
Calcareous sediments of the Muwaqqar Chalk Marl Formation, Jordan: Mineralogical and geochemical evidences for Zn and Cd enrichment
Sign Up to like & getrecommendations! Published in 2017 at "Gondwana Research"
DOI: 10.1016/j.gr.2017.03.008
Abstract: Abstract Immature organic-rich siliceous chalk (‘oil shale’) and organic-poor limestones of the Maastrichtian-Paleocene Muwaqqar Chalk Marl Formation (MCM) (central Jordan) deposited on the southern Neo-Tethys epicontinental shelf provide a perfect example of carbonate sedimentation in… read more here.
Keywords: chalk; marl formation; organic matter; muwaqqar chalk ... See more keywords
High pressure jet drilling effect in chalk and alteration of local geomechanics properties surrounding the radial hole
Sign Up to like & getrecommendations! Published in 2021 at "International Journal of Mechanical Sciences"
DOI: 10.1016/j.ijmecsci.2020.105954
Abstract: Abstract This study presents an improved understanding of how high-velocity fluid jet affects the mechanical properties of chalk, building a solid ground for the borehole stability analysis. Our laboratory experiments on water and acid-aided water… read more here.
Keywords: chalk; jet drilling; jet; high pressure ... See more keywords
Temperature cycling and its effect on mechanical behaviours of high-porosity chalks
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Rock Mechanics and Geotechnical Engineering"
DOI: 10.1016/j.jrmge.2018.11.010
Abstract: Abstract Temperature history can have a significant effect on the strength of water-saturated chalk. In this study, hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between… read more here.
Keywords: chalk; water; temperature cycling; temperature ... See more keywords
Stratigraphically controlled silicification in Danian chalk and its implications for reservoir properties, southern Danish Central Graben
Sign Up to like & getrecommendations! Published in 2020 at "Marine and Petroleum Geology"
DOI: 10.1016/j.marpetgeo.2019.104134
Abstract: Abstract The effect of silica on reservoir quality in chalk is subject to continuing debate. In particular, the stratigraphic variations in silica content within the chalk matrix have not been addressed sufficiently. In this study,… read more here.
Keywords: southern danish; danish central; reservoir; chalk ... See more keywords
Burrowed matrix powering dual porosity systems – A case study from the Maastrichtian chalk of the Gullfaks Field, Norwegian North Sea
Sign Up to like & getrecommendations! Published in 2020 at "Marine and Petroleum Geology"
DOI: 10.1016/j.marpetgeo.2019.104158
Abstract: Abstract Chalk reservoirs are commonly modelled as dual-porosity systems, in which a very porous but low permeable matrix is intersected by highly permeable vugs and fractures from which oil and gas can be produced. The… read more here.
Keywords: north sea; gullfaks field; porosity; chalk ... See more keywords
Tight chalk: Characterization of the 3D pore network by FIB-SEM, towards the understanding of fluid transport
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Petroleum Science and Engineering"
DOI: 10.1016/j.petrol.2017.05.005
Abstract: Abstract Tight chalk intervals play a major role in North-Sea hydrocarbon fields, by controlling fluid flow pathways of hydrocarbon and water. Recent studies reveal that low-permeability chalk properties are dependent on clay content and cementation.… read more here.
Keywords: fluid; pore; fib sem; chalk ... See more keywords
Validation study of water weakening research from outcrop chalks performed on Eldfisk reservoir cores
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Petroleum Science and Engineering"
DOI: 10.1016/j.petrol.2020.108164
Abstract: Abstract Seawater injection for Enhanced Oil Recovery (EOR) purposes can increase the hydrocarbon recovery factor in carbonate reservoirs but are also responsible for weakening their mechanical strength. This study investigates the geomechanical behavior of oil-bearing… read more here.
Keywords: reservoir; chalk; per day; study ... See more keywords