Results 11 to 20 of about 146,439 (338)

Breaking All the Rules: The First Recorded Hard Substrate Sessile Benthic Community Far Beneath an Antarctic Ice Shelf

open access: yesFrontiers in Marine Science, 2021
The seafloor beneath floating ice shelves accounts roughly a third of the Antarctic’s 5 million km2 of continental shelf. Prior to this study, our knowledge of these habitats and the life they support was restricted to what has been observed from eight ...
Huw J. Griffiths   +9 more
doaj   +1 more source

Evaluation of 3D positions and the positional accuracy of points within a borehole [PDF]

open access: yesGeodetski Vestnik, 2014
The article discusses simple algorithms used for the evaluation of 3D positions of points within a borehole and the accuracy of 3D positions of points within a borehole.
Željko Vukelić, Milivoj Vulić
doaj   +1 more source

The Effect of the Method of Downhole Deployment on Distributed Acoustic Sensor Measurements: Field Experiments and Numerical Simulations

open access: yesSensors, 2023
Distributed acoustic sensing (DAS) is a promising technology for seismic data acquisition, particularly in downhole applications. However, downhole DAS measurements can be affected by the deployment method of the fibre-optic cable.
Boris Gurevich   +6 more
doaj   +1 more source

Acoustic Sounding of Hydraulic Fractures in a Low-Permeability Reservoir

open access: yesMathematics, 2022
Theoretical models indicate the possibility of diagnosing the presence and the conductivity of the hydraulic fractures in reservoirs of the permeability of order milli Darcy by means of an acoustic TV set, which is a cylindrical probe of the length of ...
Vladislav Sh. Shagapov   +2 more
doaj   +1 more source

Correlation of Boreholes through Well Logs: Application to the Western Sector of Madrid

open access: yesSensors, 2023
This study correlates the results obtained from the resistivity and spontaneous potential well logs in six boreholes for water extraction, located in the multilayer siliciclastic basin in the Madrid region, in the center of the Iberian Peninsula.
Jesús Díaz-Curiel   +4 more
doaj   +1 more source

Benefits of a 3D geological model for major tunnelling works : an example from Farringdon, east-central London, UK [PDF]

open access: yes, 2012
In the design of major construction works, the better the ground conditions are known, the more control there is on the assessment of risks for construction, contract and personnel, and ultimately on final costs. Understanding of the ground conditions is
Aldiss, D.T.   +4 more
core   +2 more sources

Cretaceous–Cenozoic regional stress field evolution from borehole imaging in the southern Jinzhou area, western Liaoning, North China Craton

open access: yesEarth and Planetary Physics, 2022
The Mesozoic Yanshanian Movement affected the tectonic evolution of the North China Craton (NCC). It is proposed that Mesozoic cratonic destruction peaked ~125 Ma, possibly influenced by subduction of the western Pacific Plate beneath the Euro-Asian ...
ChengWei Yang   +3 more
doaj   +1 more source

Borehole instabilities in the KTB main borehole

open access: yesJournal of Geophysical Research: Solid Earth, 1997
Borehole instability has been a central problem for drilling operations and borehole measurements within the German Continental Deep Drilling Project (KTB) main borehole, which has been drilled entirely through crystalline rocks, mostly paragneisses and metabasites.
Borm, G.   +4 more
openaire   +3 more sources

Results of the experimental research of the heat-transfer jet pressure to the rock surface during thermal reaming of the borehole [PDF]

open access: yes, 2018
The performed analysis of scientific sources confirms the existence of a small number of publications devoted to the experimental research of the gasdynamics and plasmodynamics of jets used as a heat- transfer medium in the thermal ...
Potapchuk, Iryna   +3 more
core   +1 more source

Assessment of Berezkinskoye ore field prospectivity using Micromine software

open access: yesГорные науки и технологии, 2022
The use of modern computer aided methods, in particular the use of the Micromine software, is an important part of the integrated research for the determination of deposit prospects for various ores.
I. I. Bosikov, R. V. Klyuev
doaj   +1 more source

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