Seismic Fault Damage Zone Characterisation for Reservoir Modelling Using Advanced Attribute Analysis
C. Botter and A. Champion
Event name: Fifth International Conference on Fault and Top Seals
Session: Novel Use of Geophysics for Seal Analysis
Publication date: 08 September 2019
Info: Extended abstract, PDF ( 1.46Mb )
Price: € 20
Faults play a key role in reservoir connectivity by enhancing or restricting fluid flow. While seismic data is one the main ways of subsurface investigation, faults are still interpreted as surfaces as their internal structure is often at the limit of seismic resolution. In order to populate reservoir models of fault volumes using fault facies techniques, we introduce an innovative seismic attribute analysis to characterise fault core and damage zone from undamaged surrounding rocks in siliclastic settings. We use a total horizontal derivative attribute in addition to the standard seismic attributes applied to fault analyses, and use statistical methods to establish the outer limits of the damage zone. We apply our workflow in porous silisclastic normal faulting in the Thebe Gas Field, Exmouth Plateau of the Canarvon basin, offshore Northwest Australia. Based on this analysis, we are able to define seismic facies calibrated with well and analogue data that can be used for spatial conditioning of fault-facies based reservoir modelling. Our work provide a visual and quantitative tool to define the internal structure of the fault damage zone in order to model fluid flow more accurately in reservoir grids.