Results 131 to 140 of about 34,203 (251)

Research on unwrapping and stitching methods for borehole images

Gong-kuang zidonghua
Generating panoramic borehole wall images and "virtual cores" through image unwrapping and stitching is the basis for quantitative analysis of geological structures and is also an urgent need in borehole investigation.
DENG Libo, WANG Xiaolong
doaj   +1 more source

Palaeolandscape reconstruction of a shallow coastal embayment in Kattegat, Denmark—influence of sea‐level changes during the latest Pleistocene and Holocene

Boreas, EarlyView.
We analyse the geological processes of a coastal embayment in the Kattegat. Using high‐resolution seismic data and sediment cores, we describe a geological evolution from glacial to shallow marine stages with a variety of preserved facies from different depositional settings, including glacio‐lacustrine, telmatic, limnic and coastal environments.
Katrine Juul Andresen, Lars Ole Boldreel, Ole Bennike, Christof Pearce, Mikkel Fruergaard, Verner Brandbyge Ernstsen, Aart Kroon, Nicole Rita Posth, Marit‐Solveig Seidenkrantz   +8 more
wiley   +1 more source

Refining the timing of Middle Pleistocene (MIS 12 to MIS 6) ice advances into northern central Europe: sedimentological analysis and single‐grain luminescence dating of glaciotectonic complexes and tunnel‐valley fills

Boreas, EarlyView.
We summarize the current state of knowledge on the age of the Middle Pleistocene ice advances into northern central Europe and provide 25 new single‐grain feldspar luminescence ages of Elsterian and Saalian glacigenic sediments to constrain the age of the ice advances and their tentative correlation with marine isotope stages/substages.
Niklas von Soest, Neda Rahimzadeh, Debra Colarossi, Falko Malis, Tobias Lauer, Wera Sander‐Beuermann, Yvonne Spychala, Christian Brandes, Runa Fälber, Sumiko Tsukamoto, Jutta Winsemann   +10 more
wiley   +1 more source

Physical and mechanical characterization of the soft pyroclastic rocks forming the Orvieto cliff [PDF]

, 2002
The paper describes the results of laboratory and in situ investigations carried out on weak pyroclastic materials which could be encountered during engineering activities in volcanic regions.
RIBACCHI, Renato, ROTONDA, Tatiana, TOMMASI P   +2 more
core  

Modeling Mechanical Dispersion by Using the Method of Advective Transport Phenomena, a First Step

Groundwater, EarlyView.
A new theory for mechanical dispersion describes the spreading of water particles generated by advective flow at sub‐model scale. A representative parameter for modeling, the advective volume shift, is calculated from the distance traveled in the calculation step and stochastic parameters describing the aquifer heterogeneity only and replaces the ...
Willem J. de Lange
wiley   +1 more source

Borehole Stability in Deep Bedding Formations [PDF]

Acta Geologica Sinica - English Edition, 2019
Z.Q. Wang, L.Q. Ding, J. Yang, B.L. Liu
openaire   +1 more source

A Portable Multi‐Parameter Fluid Monitoring Unit for Real‐Time Measurements During Well Development and Geothermal Operations

Groundwater Monitoring &Remediation, EarlyView.
Abstract Monitoring of fluid parameters during well development, groundwater production, or geothermal operation is essential for the understanding of subsurface and well processes. We developed FluMoMax, a portable fluid monitoring unit, that can measure several physicochemical parameters in real‐time, to monitor fluid characteristics and to enable ...
Lioba Virchow, Jasper Florian Lüdicke, Robert Peksa, Tanja Ballerstedt, Stefan Kranz, Simona Regenspurg   +5 more
wiley   +1 more source

Borehole reinforcement based on polymer materials induced by liquid-gas phase transition in simulating lunar coring

International Journal of Mining Science and Technology
Lunar core samples are the key materials for accurately assessing and developing lunar resources. However, the difficulty of maintaining borehole stability in the lunar coring process limits the depth of lunar coring.
Dingqiang Mo, Tao Liu, Zhiyu Zhao, Liangyu Zhu, Dongsheng Yang, Yifan Wu, Cheng Lan, Wenchuan Jiang, Heping Xie   +8 more
doaj   +1 more source

Depositional Facies, Sequence Stratigraphy, and Diagenesis of Lower Cretaceous Carbonate Reservoir, Southern Iraq: Implications for Petroleum Exploration

Journal of Petroleum Geology, EarlyView.
ABSTRACT The Lower Cretaceous Yamama Formation of southern Iraq represents a key carbonate reservoir within Iraq and the Middle East, yet its complex depositional facies architecture and diagenetic alterations present challenges for predicting reservoir quality.
A. K. A. Mohammed, F. Velledits, I. Q. Mohammed, M. Alsuwaidi, H. Mansurbeg, F. Kristály, D. K. Ivanova, Eloi González‐Esvertit, A. Awdal   +8 more
wiley   +1 more source

Borehole Stability of Natural Gas Hydrate Reservoirs

Journal of Physics: Conference Series
Abstract The decomposition of natural gas hydrate (NGH) due to long-term drilling may decrease the strength of reservoirs and increase the borehole failure risk. Meanwhile, the creep properties of NGH reservoirs also may give rise to engineering problems including borehole shrinkage and jamming of drilling tools in the late stage of ...
Chuanliang Yan, Zhe Zhang, Yufa He, Zheng Tian, Yuanfang Cheng   +4 more
openaire   +1 more source