Hosted with thanks to our Platinum sponsor SLB

Gold Sponsors Katalyst Data Management, Applied Geoscience, Delft Inversion and DUG

and Silver Sponsor Qeye

PESA WA invites you to our technical luncheon on Thursday 16th February

“An integrated interpretation of the petrophysical and petrographic data acquired at Olympic 1, Canning Basin, Western Australia”

Presented by Julie Cass, GSWA

The Ordovician interval cored in Olympic 1 is one of the best-documented cored intervals of the Nambeet Formation in the Canning Basin. Consequently, the Geological Survey of Western Australia (GSWA) entered into a collaborative core analysis agreement with the EP473 Joint Venture to acquire a suite of core plugs for stratigraphic and petroleum system testing and CO2 geosequestration evaluation.

This presentation offers an integrated interpretation of petrophysical and petrographic data acquired at Olympic 1, assessing reservoir quality in the Ordovician and the impact of acoustic properties on seismic prospecting at the Meda unconformity. Volume of clay, porosity and saturation have been calculated from wireline logs to assist in the petrophysical evaluation and for comparison with x-ray diffraction, routine and special core analysis measurements.

The Nambeet Formation has been subdivided into a lower Fly Flat Member and an upper Samphire Marsh Member. The Fly Flat Member contains good storage capacity but very poor flow capacity. Quartz overgrowths and carbonate precipitation fill intergranular porosity, isolating much of the macroporosity, in which flow is then further impeded by calcite-rich laminae present throughout the sandstone. Together these characteristics lead to the Fly Flat Member being deemed low permeability and therefore unsuitable for geosequestration. Special core analysis has confirmed the Samphire Marsh Member has excellent seal capacity as pore throats are consistently measured to be microporous in all lithologies. Micropores in detrital clays are the principal pore system, with sufficient microporosity in mudstones to expect connected porosity. Gas shows correlate positively with clay volume, demonstrating this connectivity. Mechanical properties of limestone and mudstone lithologies should be investigated if proposing the Samphire Marsh Member as a seal for geosequestration, due to their contrasting properties.

The Willara Formation is capped by a distinct dolomitized zone that has enhanced porosity and permeability. The occurrence of an oil show in this interval also indicates the validity of the upper Willara Formation as a potential hydrocarbon target elsewhere in the Canning Basin.

Seismic interpretation of future Goldwyer Formation prospects would benefit from a regional understanding of the Meda unconformity and the imperceptible seismic contrast that occurs between the Grant Group claystone and Goldwyer Formation mudstone. It is likely this contributed to the shallow prognosis of the Meda unconformity in this well, and it explains the unexpected erosion of the Goldwyer Formation. Without the Goldwyer Formation, the primary target for this exploration well lacked a seal.

Ticket Prices:

Member (Early Bird): $69.00

Concession Member [Retired, Graduate or Hardship] (Early Bird): $59.00

Student Member (Early Bird): $39.00

Non-Member: $99.00

Member (Non-Early Bird): $79.00

Early bird pricing ends Thursday (1 week prior) at 5pm (AWST). All ticket sales close at 5pm Tuesday (2 days prior).

Refund Policy: Refunds are only applicable if notified in writing to WA-secretary@pesa.com.au prior to the close of ticket sales. Refunds will be issued to all participants in the case that government regulations prevent the event taking place.