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LIVE WEBINAR – The Base of Fish Scales Formation; Western Canada Sedimentary Basin: A Hybrid Stealth Shale Gas Play: Characterisation, Regional Extent and Controls on Productivity
Tuesday, 8 September @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Adelaide and Darwin
1pm – Brisbane, Canberra, Hobart, Melbourne, Sydney
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The Base of Fish Scales Formation; Western Canada Sedimentary Basin: A Hybrid Stealth Shale Gas Play: Characterisation, Regional Extent and Controls on Productivity
Presented by Basim Faraj
Co-Authored by Roy Benteau
The Base of Fish Scales Formation (BFSF) is basin-wide and marks the Albian/Cenomanian unconformity (Lower/Upper Cretaceous) boundary at the foreland Western Canada Sedimentary Basin. The formation contains abundant fish remains within finely laminated, generally non-bioturbated, very fine sandstone, siltstone, tuff and organic rich mudstones. They were deposited in a marine anoxic environment within a stratified water column in the Cretaceous Western Seaway. The formation in general is <20 m thick and characterised by high gamma on open hole logs. The anomalous high gamma signature that can reach up to 4,000 API units masks the nature of its lithology, complicating log interpretations. Resistivity and Sonic D t logs have a somewhat regular pattern, but that alone does not reveal the hybrid nature of this formation. There were no historical cores available at the time. A new core was needed to be acquired. EOG undertook coring in order to understand the unit.
Regional log mapping of the formation over a large area (165,000 Km2) in eastern Alberta and western Saskatchewan was undertaken. Geochemical studies, facies and new core analyses integration allowed the elucidation of the main controls on BFSF productivity.
The interplay between volcanic ash fall from Western Cordillera’s super volcanic eruptions, fish kill, authigenic dolomite and hydroxylapatite precipitation, the preservation of organic carbon, and the sedimentation of sand/silt layers through storm action during major regression resulted in the preservation of this unique play.
EOG Resources Canada and others have completed hundreds of vertical wells in the BFSF as either a stand-alone production zone or co-mingled with other producing zones. This strategy resulted in about 30% increase in gas production. Innovative drilling and completion techniques have been used in order to minimize formation damage.
Production from the BFSF varies widely between 2 and 244 Mcf/d, with production profiles showing a classic unconventional pattern.