Nathan Ceglar

MSc Student

Telephone: +61 8 8303 4304
Facsimile: +61 8 8303 4345

MSc Project:

Sequence Stratigraphy and Reservoir Characterisation of Permian Fluvial-Lacustrine Successions in the Baryulah Complex, Cooper Basin.

Commenced: 2000

Supervisor: Assoc Prof Simon Lang

Project support: Santos Queensland

Scholarship support: Santos Queensland

The project involves examination of wireline logs, cores, and 3D seismic data to develop a sequence stratigraphic framework and depositional model for the Baryulah area in the Cooper Basin Queensland. The scientific questions to be answered include, what is the geometry inconnectivity and depositional architecture of reservoir facies in the Permian hydrocarbon bearing units on the southern side of the Cooper Basin. Using flooding surfaces and sequence boundaries to package the Patchawarra-Murteree-Epsilon-Toolachee succession into depositional unconformity-bound sequences and their systems tracts, discrete intervals are identified that contain reservoir prone facies of differing geometry inconnectivity and depositional architecture. For example, immediately above regional unconformities in the CB typically lie high nett-gross sand-prone reservoir facies deposited as high energy braided streams or amalgamated meandering streams (alluvial lowstand systems tract). In contrast, reservoir facies deposited in the alluvial trangressive and early highstand systems tracts tend to have a higher degree of isolation associated with the higher ratio of accommodation to sediment supply. Using this sequence stragraphic framework each genetic interval bounded by these surfaces (ie each systems tract) can be mapped across the area and palaeogeographic reconstructions prepared that can be tested by comparison with 3D seismic amplitude extractions for approximating each interval. Using the available core data and key input from reservoir analogues (modern and ancient examples of fluvial systems in cool temperate peat-forming environments) channel belt scale, geometry and orientation are estimated using published data on channel thickness to channel belt width. These results are then cross-checked against the 3D seismic visualisation that clearly shows well developed meander belt geometries.

By the end of 2000, the key results had been summarised and documented and the thesis was being written with a view to completion in mid to late 2001.