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TZID:Australia/Perth
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DTSTART:20240101T000000
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DTSTART;TZID=Australia/Perth:20251002T180000
DTEND;TZID=Australia/Perth:20251002T200000
DTSTAMP:20260605T183812
CREATED:20250818T062050Z
LAST-MODIFIED:20250905T110143Z
UID:10008718-1759428000-1759435200@pesa.com.au
SUMMARY:PESA WA October Technical Evening:  Three-Dimensional Architecture of Wave-Dominated Delta Deposits
DESCRIPTION:Hosted with thanks to our Platinum sponsor SLB: \n  \n \nGold Sponsors IKON Science: \n \n  \nand Silver Sponsors Delft\, Qeye\, Totum Compliance\, Core Laboratories and Task Fronterra Geoscience: \n                       \n       \n\nPESA WA invites you to our technical evening on Thursday 2nd October.\nSupported by Santos Ltd.\nThree-Dimensional Architecture of Wave-Dominated Delta Deposits\nPresented by Brian J. Willis (Willis Geoscience)\n\nNew numerical wave-influenced delta depositional models are challenging long-held rational for interpreting sea level variations recorded by wave-dominated shallow-marine successions. Shallow-marine\, wave-dominated deposits (parasequences) are generally inferred to exhibit a decrease in wave energy and grain size with increasing water depth and to occur in facies belts that are laterally continuous for long distances along strike. Bedding geometry and vertical facies successions within these parasequences are interpreted in relation to a prograding equilibrium shoreface profile (cf. Bruun rule) and a gradual upward-coarsening facies progression (cf. Walther’s law). Sea-level fall is commonly inferred to generate a sharp-based shoreface succession\, characterized by an abrupt vertical transition from heterolithic lower shoreface to sandy upper shoreface deposits across a marine erosion surface. A truncated vertical shoreface succession\, capped by a marine erosion surface\, is inferred to record significant wave ravinement during sea level rise and transgression. \nThree-dimensional\, process-physics-based\, coupled hydrodynamic-morphodynamic wave-influenced delta models suggest that wave-dominated deltas will develop a sandy shoreface inner clinoform dipping from the subaerial delta plain to a relatively flat wave-scoured subaqueous delta top\, which is laterally separated from a muddier delta front outer clinoform that dips from the subaqueous delta top edge to the shelf floor. As these systems prograde\, deposits of these dual-clinoforms will become vertically stacked and will be separated by a regressive surface of marine erosion formed on the subaqueous delta top. Grain-size contrasts between these vertically stacked clinoform deposits reflect differences in sediment-transport directions and sorting under river- and wave-driven littoral currents along the coast\, and cannot be uniquely related to sea-level changes. Gradual vertical facies successions develop where waves are less effective at reworking river-supplied sediment alongshore. In contrast\, sharp-based shoreface deposits record more effective wave separation of sands onto the shoreface clinoform as muds are preferentially transported offshore onto the subaqueous delta clinoform. \nThe continuity of a regressive surface of marine erosion over many tens to hundreds of kilometres across mid-shelf regions of some stratigraphic sequences reflects a gradual lateral shift in the position of littoral current erosion on a subaqueous delta top. Timelines cross such vertical lithic discontinuities throughout the extent of a prograding deposit\, and the regressive surface of marine erosion thus has little chronostratigraphic significance. The model results are used to suggest: 1) Characteristic strongly asymmetric wave-dominated parasequences suggest common river avulsion at the start of transgression\, 2) Observed down-dip transitions from “gradual-based” to “sharp-based” shoreface deposits might record reduced sediment supply to the coast relative to rates of longshore drift as the system expands toward its auto-retreat limit\, rather than transitions from normal to forced regression\, and 3) Regional “top-truncated” shoreface successions might record progradation of dual-clinoform shorelines with wide deviation in net direction of regional sediment supply and shallow-water wave transport\, rather than significant regional transgressive ravinement. The results of these models suggest caution in inferring sea-level changes from the character of vertical facies changes observed in individual well logs and isolated outcrop exposures. The models suggest new facies relationships that require testing in modern systems\, outcrops\, and subsurface examples. \nTicket Prices:\nMember: $25.00 \nStudent Member: $10.00 \nNon-Member: $50.00 \nStudent Member pricing ends Thursday (1 week prior) at 5pm (AWST). \n 
URL:https://pesa.com.au/events/pesa-wa-october-technical-evening-three-dimensional-architecture-of-wave-dominated-detla-deposits/
LOCATION:The Globe\, 495/497 Wellington Street\, Perth\, Western Australia\, 6000\, Australia
CATEGORIES:Industry,Technical Lunch,WA
ATTACH;FMTTYPE=image/avif:https://pesa.com.au/wp-content/uploads/2025/08/Graphic.avif
ORGANIZER;CN="PESA Western Australia":MAILTO:wa-secretary@pesa.com.au
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DTSTART;TZID=Australia/Perth:20251003T090000
DTEND;TZID=Australia/Perth:20251003T160000
DTSTAMP:20260605T183812
CREATED:20250818T070847Z
LAST-MODIFIED:20251003T001413Z
UID:10008722-1759482000-1759507200@pesa.com.au
SUMMARY:PESA WA - The Mungaroo - Brigadier Depositional System\, Northwest Shelf Australia: A Fluvial-Deltaic Reservoir Core Workshop
DESCRIPTION:Supported by Santos Ltd.\nPESA WA \n3rd October 2025\, 9:00 – 1600 Carlisle Core Library\nThe Mungaroo – Brigadier Depositional System\, Northwest Shelf Australia: A Fluvial-Deltaic Reservoir Core Workshop\nThe Late Triassic Mungaroo and Brigadier Formations in the offshore Northern Carnarvon Basin\, NWS\, Australia\, are the deposits of enormous very low-gradient rivers that fed an intracratonic basin. In such a very low gradient setting\, the rivers expand across a broad distributive deltaic plain\, as sediments spill out of channels into vast interdistributary bays. River distributaries reaching the coast deposit thin\, asymmetrical wave-reworked delta sands. Avulsion of rivers laterally over hundreds of kilometres shifts the locus of deposition\, allowing weak waves and tides time to rework sediments at bay mouths into shoreface sands with tidal inlets. Sea level variations can cause shorelines to shift long distances across these low-gradient alluvial-deltaic plains. \nStandard facies models for fluvial-deltaic systems\, which generally focus on higher gradient settings\, do not provide a suitable template for predicting subsurface facies variations within the Mungaroo and Brigadier deposits. In higher gradient settings\, a river crosses thin delta top deposits to feed a thick\, basinward-thickening deltaic wedge\, with the bulk of river-sourced sediments spread down steep deltaic clinoforms offshore. In very low-gradient settings\, a river loses the competency to carry its sediment load to the coast\, and the bulk of the sediment is extracted on the deltaic plains. Deposits in the expanding network of channels\, on floodplain splays and brackish bay deltas\, and within thin shoreline successions define a unique facies mosaic. \nIn this workshop\, participants can observe the low-gradient fluvial-deltaic facies of the Mungaroo and Brigadier systems in core from the Northwest Shelf of Australia. Brief presentations will introduce conceptual models\, set the stage\, and provide a seismic-scale view of this system. Deposits of the major river in more proximal areas of the system are studied in core from Clio and Saty fields. Lower delta plain and river-dominated bay delta deposits are examined in core from Chandon field. Wave-reworked shoreline deposits will be visible in core from Wheatstone field. Together\, these cores provide a sampling of the facies mosaic deposited by these low-gradient systems. By the end of the workshop\, participants will have gained a better understanding of facies models for low-gradient fluvial-deltaic systems. Mungaroo and Brigadier deposits host world-class hydrocarbon reserves\, which require advanced facies predictions to support subsurface modelling and development predictions. Low-gradient fluvial-deltaic facies are essential components of most shallow marine clastic wedges\, particularly during the early highstand when deltaic systems prograde on top of transgressive shelf deposits. The workshop offers participants a broader perspective on fluvial-deltaic facies models\, extending beyond the standard textbook examples. \n  \nSchedule \n9:00 ─ Safety & Introductions \n9:20 ─ Topic #1: Fluvial deposit architecture defined by process models and concepts (Willis: 20 min) \n9:40 ─ Topic #2: Mungaroo-Brigadier System (Lang: 20 min) \n10:00 ─ Topic #3: Mungaroo fluvial hierarchy and down-basin variations (Payenberg: 20 min) \n10:30 ─ Tea break \n10:45 ─ Start Core #1: Mungaroo fluvial (Clio 2 and Satyr 3) \n11:45 ─ Discussion (core review) \n12:00 ─ Lunch \n12:45 ─ Short topic #1 (20 min plus Q&A) High- vs low-slope systems & asymmetric deltas \n13:10 ─ Start core #2: Chandon 2 (Mungaroo lower delta plain and delta front) \n14:00 ─ 14:15 ─ Tea break \n14:30 ─ Start core #3: Wheatstone 2 BCH1ST1 (Brigadier asymmetric wave-influenced delta) \n15:30 ─ Wrap-up discussion \n15:45 ─ Finish \n16:00 ─ Core store closes \nOrganisers: Dr. Brian Willis (Consultant) Dr. Tobi Payenberg (Chevron) & Prof. Simon Lang (UWA) \nHard limit of 30 attendees.  \n  \nCost:  \nPESA Members:  $250 \nPESA Student Members $100 \n  \nThis event is for PESA WA members only. This is for insurance purposes. Please do not book on behalf of non-members. Please do not attend if you do not have a ticket. \nIf there are any questions\, please don’t hesitate to contact:  wa-secretary@pesa.com.au
URL:https://pesa.com.au/events/pesa-wa-the-mungaroo-brigadier-depositional-system-northwest-shelf-australia-a-fluvial-deltaic-reservoir-core-workshop/
LOCATION:Carlisle core library\, 37 Harris Street\, Carlisle\, WA\, 6101\, Australia
CATEGORIES:Discussion Forum,Industry,WA
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ORGANIZER;CN="PESA Western Australia":MAILTO:wa-secretary@pesa.com.au
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DTSTART;TZID=Australia/Perth:20251016T120000
DTEND;TZID=Australia/Perth:20251016T140000
DTSTAMP:20260605T183812
CREATED:20250827T035147Z
LAST-MODIFIED:20251015T064551Z
UID:10008728-1760616000-1760623200@pesa.com.au
SUMMARY:PESA WA October Technical Lunch: Fault timing and depocentre development in the northern Perth Basin
DESCRIPTION:Hosted with thanks to our Platinum sponsor SLB: \n  \n \nGold Sponsors IKON Science: \n \n  \nand Silver Sponsors Delft\, Qeye and Task Fronterra Geoscience: \n                       \n\nPESA WA invites you to our technical luncheon on Thursday 16th October.\nFault timing and depocentre development in the northern Perth Basin\nPresented by Chris Watts (School of Earth and Planetary Sciences\, Curtin University)\n\nDespite extended periods of exploration in the Perth Basin spanning decades\, the timing of fault activity\, and shifts in depocentre development remain unclear\, especially for intra-basinal faults. Multiple phases of rifting with variable extension directions during the Paleozoic and Mesozoic resulted in a series of predominantly NNW–SSE trending graben and half-graben extending from the Southern Carnarvon Basin in the north\, through the Perth Basin in the south. Two regions of greater structural complexity are indicated by gravity and magnetic data along the margin\, one of which occurs within the northern Perth Basin and the other between sub-basins of the Southern Carnarvon Basin. Recently acquired seismic surveys that better image the pre-Mesozoic stratigraphy in the northern Perth Basin\, paired with legacy seismic and well data have allowed the investigation of fault timing and show a progressive southward shift in fault activity and depocentre location from the late Carboniferous through to the Early Cretaceous\, and that some faults\, despite having different similar orientations\, initiate at different times. Of particular importance is a change in extension direction in the late Triassic and early Jurassic that allowed the development of E-W trending faults. \nTicket Prices:\nMember (Early Bird): $69.00 \nConcession Member [Retired or Hardship]: $59.00 \nStudent Member: $10.00 \nGraduate Member: $20.00 \nNon-Member: $99.00 \nMember (Non-Early Bird): $79.00 \nEarly bird\, Concession\, Student and Graduate Member pricing ends Thursday (1 week prior) at 5pm (AWST). All ticket sales close at 5pm Tuesday (2 days prior). \n 
URL:https://pesa.com.au/events/pesa-wa-june-technical-lunch-fault-timing-and-depocentre-development-in-the-northern-perth-basin/
LOCATION:Parmelia Hilton\, 14 Mill Street\, Perth\, Australia
CATEGORIES:Industry,Technical Lunch,WA
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ORGANIZER;CN="PESA Western Australia":MAILTO:wa-secretary@pesa.com.au
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