Influence of host rock composition on permeability reduction in shallow fault zones – implications for fault seal analysis (Vienna Basin, Austria)
-
Published:2020-09-04
Issue:2
Volume:27
Page:petgeo2020-014
-
ISSN:1354-0793
-
Container-title:Petroleum Geoscience
-
language:en
-
Short-container-title:Petroleum Geoscience
Author:
Schröckenfuchs Theresa1, Schuller Volker1, Zamolyi Andras1, Mekonnen Elias1, Grasemann Bernhard2
Affiliation:
1. OMV Exploration & Production GmbH, Trabrennstrasse 6–8, 1020 Vienna, Austria 2. Department of Geodynamics and Sedimentology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
Abstract
In order to calibrate equations for fault seal capacities to a specific basin, faults were analysed using core material from several Neogene hydrocarbon fields in the Vienna Basin, Austria. All studied specimens are siliciclastic rocks that were sampled from a depth interval of <2000 m, and share a similar depth at time of faulting, diagenetic conditions and maximum burial depth. Laboratory results showed a permeability reduction in all fault rocks compared to the host rocks. Both the highest and the lowest fault seal capacities were observed in the same fault rock type with a low phyllosilicate and clay content, and classifying as cataclastic deformation bands. Investigating the strong permeability variations within these fault rocks, microscopic analyses revealed that the fault seal potential is strongly linked to the detrital dolomite content in the host rock. Grain-size reduction processes occur preferably in the dolomite grains, accompanied by cementation. Our study suggests that – in addition to using standard fault seal analysis algorithms – accounting for host rock composition and grain-size reduction therein might help to further constrain fault seal behaviour in shallow depths. Fault seal mechanisms need to be understood on field, formation and micro scales before drawing conclusions for a full basin calibration.Thematic collection: This article is part of the Fault and top seals collection available at: https://www.lyellcollection.org/cc/fault-and-top-seals-2019
Publisher
Geological Society of London
Subject
Earth and Planetary Sciences (miscellaneous),Economic Geology,Geochemistry and Petrology,Geology,Fuel Technology
Reference71 articles.
1. Model for hydrocarbon migration and entrapment within faulted structures;Allan;AAPG Bulletin,1989 2. Antonellini, M.A. , Aydin, A. and Orr, L. 1999. Outcrop aided characterization of a faulted hydrocarbon reservoir: Arroyo Grande oil field, California, USA. American Geophysical Union Geophysical Monograph Series , 113, 7–26. 3. Arzmüller, G. , Buchta, S. , Ralbovsky, E. and Wessely, G. 2006. The Vienna basin. AAPG Memoirs , 84, 191–204. 4. Austin, N.J. and Kennedy, L. 2005. Textural controls on the brittle deformation of dolomite: Variations in peak strength. Geological Society, London, Special Publications , 243, 37–49, https://doi.org/10.1144/GSL.SP.2005.243.01.05 5. Factors controlling permeability of cataclastic deformation bands and faults in porous sandstone reservoirs
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|