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GEOREF RECORD

Extending interpretations of natural fractures from the wellbore using 3D attributes; the Carnarvon Basin, Australia

Adam H. E. Bailey, Rosalind C. King, Simon P. Holford and Hand Martin
Extending interpretations of natural fractures from the wellbore using 3D attributes; the Carnarvon Basin, Australia
Interpretation (Tulsa) (February 2016) 4 (1): SB107-SB129

Abstract

Natural fractures can be identified in wellbores using electric resistivity image logs; however, the challenge of predicting fracture orientations, densities, and probable contribution to subsurface fluid flow away from the wellbore remains. Regional interpretations of fracture sets are generally confined to areas featuring an extensive reservoir analog outcrop. We have made use of extensive data sets available in Western Australia's Northern Carnarvon Basin to map subsurface natural fractures, contributing to a regional understanding of fracture sets that can be applied to broader parts of the basin. The Northern Carnarvon Basin is composed of distinct structural domains that have experienced differing tectonic histories. Interpretation of regional fractures was achieved through an integrated approach, incorporating electric resistivity image logs from 52 Carnarvon Basin wells and seismic attribute analysis of two 3D seismic data sets: Bonaventure_3D (6687 km (super 2) ) and HC_93_3D (1414 km (super 2) ). Integration of these two data sets allows for a regionally extensive identification of natural fractures away from well control. Fractures of differing age and character are identified within the basin: Outboard areas are dominated by fractures likely to be open to fluid flow that are parallel to subparallel to the approximately east-west present-day maximum horizontal stress, providing possible flow conduits between potential damage zones identified alongside the north-northeast/south-southwest-striking faults that constitute the major structural trend of the basin, and inboard areas dominated by northeast-southwest to north-northeast/south-southeast fractures formed in fault damage-zones alongside normal, and inverted-normal, faults at those orientations. Finally, fractures observed in wells from the Rankin Platform and Dampier Subbasin occur at neither of these orientations; rather, they closely parallel the strikes of local faults. Additionally, variation is seen in fracture strikes due to isotropic present-day stress magnitudes. This methodology extends fracture interpretations from the wellbore and throughout the region of interest, constituting a regional understanding of fracture sets that can be applied to broader parts of the basin.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 4
Serial Issue: 1
Title: Extending interpretations of natural fractures from the wellbore using 3D attributes; the Carnarvon Basin, Australia
Affiliation: University of Adelaide, Australian School of Petroleum, Adelaide, South Aust., Australia
Pages: SB107-SB129
Published: 201602
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 107
Accession Number: 2017-008931
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps, 1 table, strat. col.
S22°00'00" - S20°00'00", E112°00'00" - E116°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201708
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