90 research outputs found
Transport efficiency and dynamics of hydraulic fracture networks
Acknowledgments This study is carried out within the framework of DGMK (German Society for Petroleum and Coal Science and Technology) research project 718 āMineral Vein Dynamics Modeling,ā which is funded by the companies ExxonMobil Production Deutschland GmbH, GDF SUEZ E&P Deutschland GmbH, RWE Dea AG and Wintershall Holding GmbH, within the basic research programme of the WEG Wirtschaftsverband Erdƶl- und Erdgasgewinnung e.V. We thank the companies for their financial support and their permission to publish our results. We further acknowledge support by Deutsche Forschungsgemeinschaft and Open Access Publishing Fund of University of TĆ¼bingen.Peer reviewedPublisher PD
Fracturing of ductile anisotropic multilayers : influence of material strength
Acknowledgements. This work was financed through the research project CGL2004-03657, funded by the Spanish Ministry of Education and Science. We thank J. Carreras, E. Druguet and L. M. CastaƱo for discussions on some aspects related to this work. We gratefully acknowledge G. Zulauf and T. Duretz, whose constructive reviews greatly improved the manuscript, and the editorial guidance of N. MancktelowPeer reviewedPublisher PD
A new stylolite classification scheme to estimate compaction and local permeability variations
This study was carried out within the framework of DGMK (German Society for Petroleum and Coal Science and Technology) research project 718 āMineral Vein Dynamics Modelingā, which is funded by the companies ExxonMobil Production Deutschland GmbH, GDF SUEZ E&P Deutschland GmbH, DEA Deutsche Erdoel AG and Wintershall Holding GmbH, within the basic research program of the WEG Wirtschaftsverband Erdoel- und Erdgasgewinnung e.V. We thank the companies for their financial support and their permission to publish these results. This work has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 31688. The Zechstein data were collected with the help of Simon Gast. We thank Jean-Pierre Gratier and an anonymous reviewer for their comments that improved an earlier version of the manuscript.Peer reviewedPostprin
From hot to cold - The temperature dependence on rock deformation processes : An introduction
Acknowledgements We thank Bill Dunne for his work as Journal of Structural Geology overseeing editor, and to all the reviewers of manuscripts submitted to this special issue. We gratefully acknowledge Richard D. Law, Paul D. Bons, Albert Griera and Maria-Gema Llorens for reviewing this article prior to submission. The programme, abstract and field excursion guides for the DRT-2017 Inverness conference are available at: https://www.abdn.ac.uk/geosciences/events/downloads-1112.php.Peer reviewedPostprin
Grain boundary networks and shape preferred orientation : A fresh angle on pattern quantification with GBPaQ
A quantitative understanding of grain shape preferred orientation (SPO) and grain boundary networks as fundamental characteristics of rocks and other crystalline solids is of major interest in geology and material science. Grain boundary networks contain useful information on the deformation history of polycrystalline aggregates, and their diagenetic and metamorphic histories. SPO can have a major impact on material characteristics such as permeability, acoustic velocity and mechanical strength, and on reaction surfaces. The objective of this study is to present a semi-automated toolbox of MATLABā¢ scripts, named Grain Boundary Pattern Quantification (GBPaQ), that incorporate different methods for grain boundary pattern quantification for their application to, for example, seismic wave attenuation estimation. GBPaQ uses grain boundary statistics and calculates radial scan line intercepts. In this paper, GBPaQ is tested on two example grain boundary patterns, a granular texture and a foam texture with equant grains, which have been digitally stretched (deformed) to analyse their SPO evolution. The results show that a combination of grain ellipse, grain boundary segment orientation, and grain boundary segment intercept density rose diagrams provide a complete, detailed quantification of grain boundary pattern anisotropy. Grain boundary segment intercept (GBSI) analysis using GBPaQ yields a new grain boundary network parameter ā the minimum intensity of grain boundary intercepts (Imin) ā which follows a power law relationship with the average axial ratio of grain-fitted ellipses (r) during SPO development. We propose that Imin can be used for the quantitative analysis of SPO strength as a useful tool to assess the deformation history of polycrystalline aggregates. Further studies involving a broader range of different patterns and strain histories are necessary to fully investigate the potential of Imin versus r diagrams
Rapid hydration and weakening of anhydrite under stress : Implications for natural hydration in the Earthās crust and mantle
Acknowledgements JThis research has been supported by an AberdeenāCurtin Alliance international postgraduate scholarship, by a Curtin publication grant, and by the Natural Environment Research Council (grant no. NE/T007826/1). Enrique Gomez-Rivas acknowledges the āRamĆ³n y Cajalā fellowship RYC2018-026335-I, funded by the Spanish Ministry of Science and Innovation (MCIN), the State Research Agency of Spain (AEI), and the European Social Fund (ESF)/10.13039/501100011033, as well as the DGICYT research project PID2020-118999GB-I00, funded by the Spanish Ministry of Science and Innovation (MCIN) and State Research Agency of Spain (AEI)/10.13039/501100011033.Peer reviewedPublisher PD
Fluid mixing from below in unconformity-related hydrothermal ore deposits
This research was partly funded by German Research Foundation (DFG) grant BO 1776/8 and was carried out within the framework of DGMK (German Society for Petroleum and Coal Science and Technology) project 718, funded by the companies ExxonMobil Production Deutschland GmbH, GDF SUEZ E&P Deutschland GmbH, RWE Dea AG, and Wintershall Holding GmbH. Assistance by Simone Kaulfuss, Gabi Stoschek, Sara Ladenburger, Mathias Burisch, and Bernd Steinhilber with sample preparation and crush-leach analyses is gratefully acknowledged. We thank Steve Cox and two anonymous reviewers for their critical comments.Peer reviewedPostprin
Fluid pressure drops during stimulation of segmented faults in deep geothermal reservoirs
Acknowledgements The Institut CartogrĆ fic i GeolĆ²gic de Catalunya is acknowledged for their support in our investigation of Geothermal resources. G. Piris was supported by an AGAUR grant of the Industrial Doctorate programme 2016-DI-031. EGR acknowledges the support of the Beatriu de PinĆ³s programme of the Government of Cataloniaās Secretariat for Universities and Research of the Department of Economy and Knowledge (2016 BP 00208). The authors would like to thank three anonymous reviewers and the editors Dr. Carola Meller and Prof. Olaf Kolditz for their helpful comments that improved this manuscript.Peer reviewedPublisher PD
Strain and vorticity analysis using small-scale faults and associated drag folds
This work was financed through the PhD grant BES-2003-0755 to EGR and research project CGL2004-03657, both funded by the Spanish Ministry of Education and Science. We thank Jens Becker and Anne Peschler for their help with the BASIL modelling. We gratefully acknowledge D. Jiang and T. Bell, whose constructive reviews greatly improved the manuscript.Peer reviewedPostprin
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