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PESA WA June Luncheon: Shelf-margin architecture, sediment partitioning and shallow- to deep-water reservoirs distribution in the Barrow Group (Northern Carnarvon Basin, North West Shelf, Australia): Insights from quantitative seismic stratigraphy

Thursday, June 14 @ 12:00 - 14:00

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Guest Speaker: Victorien Paumard

Victorien Paumard is a PhD student at the Centre for Energy Geoscience, University of Western Australia. He graduated with a BSc in Geology and a MSc in Petroleum Geology from the UniLasalle University in France. His MSc research project was realized with TOTAL E&P and focused on the 3D seismic stratigraphy of Oligocene-Miocene carbonate platforms (Yadana Field, Myanmar). His PhD research (co-founded by UWA and Chevron) is focused on the links between shelf-margin architecture, shallow-marine processes and deep-water depositional systems within the Barrow Group (Northern Carnarvon Basin, NWS, Australia). His research interests are in basin analysis, seismic stratigraphy and sequence stratigraphy. Victorien is particularly interested in the development of quantitative methods to better characterize the architecture of continental margins and better predict the location of reservoirs along shelf-slope-basin profiles.

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Shelf-margin architecture, sediment partitioning and shallow- to deep-water reservoirs distribution in the Barrow Group (Northern Carnarvon Basin, North West Shelf, Australia): Insights from quantitative seismic stratigraphy

Victorien Paumard

Traditional stratigraphic models predict that accumulation of deep-water siliciclastic reservoirs occur when falling sea-levels promote basinward migration of rivers and development of shelf-edge deltas. However, recent studies show that the processes redistributing sediments at the shelf-edge seem to have a direct impact on the shelf-to-basin sediment transfer mechanisms and the accumulation of reservoir-grade sands.

The Barrow Group constitutes a unique example of a regressive shelf margin (~100-500 m shelf-to-basin relief) developed continuously during a syn-rift to post-rift transition (Latest Tithonian – Late Valanginian) in the Northern Carnarvon Basin (North West Shelf, Australia). In this study, we focus on the Lower Barrow Group (LBG; late syn-rift I and II) that developed under supply-dominated conditions. However, lateral variations in subsidence regime and shifts in sediment supply led to significant variations in shelf-margin architecture along strike, directly impacting the distribution of sediments between the shelf and deep-water areas.

To better integrate the variability of shelf-margin depositional systems in time and space, and better understand the shelf-to-basin sediment transfer mechanisms, we present a new workflow combining full-volume 3D seismic interpretation methods with a dynamic stratigraphic approach (i.e., 3D quantitative seismic stratigraphy). This workflow allowed developing a high-resolution seismic stratigraphic framework for the LBG with the identification of 73 clinothems (average time span of ~63,000 years).

The quantitative analysis conducted links together: (1) key shelf-edge geometries (trajectory angle, slope gradient, differential sedimentation between topsets and bottomsets); and (2) paleoshoreline processes and architecture of coeval deep-water deposits (both determined through 3D seismic geomorphology). Statistical analysis of these data reveal the genetic linkages between A/S conditions on the shelf, deltaic hydrodynamic regime and slope-to-basin depositional architecture.

Results show that low A/S conditions on the shelf were associated with sediment bypass to the slope, whereas high A/S conditions were linked with increasing sediment storage on the shelf. While fluvial to wave processes can be dominant in all A/S conditions, fluvial-dominated coastlines are mostly associated with steep clinoform slope gradients and more mature turbidite systems. In contrast, wave-dominated shorelines are linked to gentle clinoform slope gradients and no to poor turbidite system development (unchannelized sheet sands and MTDs), leaving a starved slope. These variations are observed both through time and along strike.

High-resolution 3D quantitative seismic stratigraphy constitutes a new step in sequence stratigraphy as: (1) it allows interpreters to map sequences in a true 3D environment, hence taking into account the full variability of depositional systems through time and space; (2) it highlights the significant role of shelf-margin architecture and processes in predicting the distribution of reservoirs in the shallow- and deep-water segments of continental margins; and (3) it offers an observation-based and model-independent approach to better understand the short-term and long-term controls on sequence development in shelf-margin depositional systems.

Cost:

$68 for PESA Members (early bird price)
$98 for non members
$78 for all PESA members who book after 11th June
$38 for students (early bird price)
$58 for graduate, retired and hardship members (early bird price)

Early bird closes Monday 11th June 5pm, all registration close Tuesday 12th June 5pm

 

Details

Date:
Thursday, June 14
Time:
12:00 - 14:00

Venue

Parmelia HIlton
14 Mill Street, Perth, WA 6000 Australia
Phone:
+61-8-9215-2000
Website:
http://goo.gl/J2k95s

Organizer

PESA Western Australia
Email:
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