Predicting the Internal Structure of Fault Zones in Basalt Sequences, and Their Effect on Along- and Across-fault Fluid Flow

Released on by Rachael Ellen
preview-18

  • Predicting the Internal Structure of Fault Zones in Basalt Sequences, and Their Effect on Along- and Across-fault Fluid Flow Book Detail

  • Author : Rachael Ellen
  • Release Date : 2012
  • Publisher :
  • Genre :
  • Pages : 0
  • ISBN 13 :
  • File Size : 77,77 MB
DOWNLOAD BOOK

Predicting the Internal Structure of Fault Zones in Basalt Sequences, and Their Effect on Along- and Across-fault Fluid Flow by Rachael Ellen PDF Summary

Book Description: Interest in the architecture and fluid flow potential of fault zones in basalt sequences has intensified over recent years, due to their applications in the hydrocarbon industry and CO2 storage. In this study, field mapping is combined with micro-structural analyses and flow modelling to evaluate fault growth, evolution, fluid-rock interactions, and permeability changes over time in faults in basalt sequences. Twelve brittle fault zones cutting basalt sequences in the North Atlantic Igneous Province were studied. This study finds that fault architecture is ultimately controlled by displacement and juxtaposition. Self-juxtaposed faults (i.e. basalt faulted against itself) are characterised by wide zones of brecciation, cataclasis, fracturing, mineralisation and alteration. Non self-juxtaposed faults (i.e. basalt faulted against an inter-lava unit) are characterised by relatively narrow principal slip zones, filled with clay smears or clay-rich gouge derived from inter-lava beds. This study also finds that brittle deformation of basalts at the grain scale is mineralogy dependent. Fe-Ti oxides and pyroxenes deform by intragranular fracturing and grain size reduction, whereas olivines and feldspars are susceptible to replacement by clay and zeolites. Fault rock bulk chemistries are likely to differ from their host rocks, and this is controlled by secondary mineral formation, with zeolite and clay minerals playing an important role. Flow modelling in this study shows that controls on along- and across-fault fluid flow can significantly change fault zone bulk permeability over time, as a result of mineralisation and alteration of the fault zone as it evolves. The results from this study are used to propose a model for how fault strength, fault-related alteration, and permeability change over time in fault zones in basalt sequences. Results highlight the impact that fault-related alteration could have on CO2 storage. A predictive model for fault structure at depth, developed from this study's findings, is presented for fault zones in basalt sequences, which has particular relevance to the hydrocarbon and CO2 industry.

Disclaimer: www.yourbookbest.com does not own Predicting the Internal Structure of Fault Zones in Basalt Sequences, and Their Effect on Along- and Across-fault Fluid Flow books pdf, neither created or scanned. We just provide the link that is already available on the internet, public domain and in Google Drive. If any way it violates the law or has any issues, then kindly mail us via contact us page to request the removal of the link.

The Internal Structure of Fault Zones

The Internal Structure of Fault Zones

File Size : 41,41 MB
Total View : 953 Views
DOWNLOAD

Faults are primary focuses of both fluid migration and deformation in the upper crust. The recognition that faults are typically heterogeneous zones of deformed

Integrated Fault Seal Analysis

Integrated Fault Seal Analysis

File Size : 60,60 MB
Total View : 937 Views
DOWNLOAD

Faults commonly trap fluids such as hydrocarbons and water and therefore are of economic significance. During hydrocarbon field development, smaller faults can