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Sedimentology, Sequence Stratigraphy And Reservoir Potential Of The Warrinilla Field, Bowen Basin.

Best, Heidi Ann

Honours Degree, 1999

University of Adelaide

Abstract

The development of reservoir facies models and sequence stratigraphic framework for the Warrinilla Field, Denison Trough, eastern Queensland is an essential component of establishing future hydrocarbon production and development strategies.

Revision of the stratigraphy using sequence stratigraphic principles and the integration of available core data, has the potential to significantly improve understanding of reservoirs and seals.

Logging of almost 1,500 m of core enabled the interpretation of facies assemblages previously identified by earlier workers, placing them in context with flooding surfaces, maximum flooding surfaces and sequence boundaries. Using the facies types derived from core, and the classification of associated stacking patterns identified from log motifs, depositional systems tracts were identified for eight sequences. For each sequence isopachs and sand percentages were calculated. In conjunction with core and well log motifs, palaeogeographic maps were then prepared for each of the sequences.

Potential reservoir targets were found in Sequences 2, 4, 5, 6, and 8 with the identification of deltaic mouth bar and shoreface deposits. Sequence 2, from the Upper Moorooloo sequence boundary to the Upper Staircase transgressive boundary were interpreted as a possible forced regressive systems tract with the area between Warrinilla #5 and Warrinilla #2 a potential reservoir target. Sequences 4 and 5 of the Aldebaran Sandstone were found to contain significant quartzose fluvial-deltaic sandstones with reservoir potential, but petrology indicates a reduced potential due to the abundance of illite-smectite rims. Sequence 8 (Mantuan Formation) was interpreted as a north and south progradational deltaic system with drilling potential in the region between Warrinilla #5, and Warrinilla #2 and #6. Production problems however are possible due to the abundance of chlorite cement.

Significant potential still exists for hydrocarbon exploration in the Warrinilla Field. Whilst the Mantuan Formation and the Aldebaran Sandstone have been previously considered as possible reservoir targets, this study suggests the forced regressive wedge of the Staircase Sandstone should be specifically expanded.

The development of facies models and stratigraphic framework, along with the integration of petrology, has been a useful tool in the development of the hydrocarbon potential of the Warrinilla Field.

Australian School of Petroleum
THE UNIVERSITY OF ADELAIDE

SA 5005 AUSTRALIA

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