Publication Name: Gippsland Basin Symposium, Melbourne, 22 ? 23 June 1992
Authors: M KING, B RAYNER
Publication Volume: Melbourne, 22 - 23 June 1992
Date Published: December 1992
Number of Pages: 19
Reference Type: Conference Proceedings
Abstract:
Five wells have been drilled in the Basker/Manta Block of VIC/P19,Gippsland Basin, resulting in sub-economic Intra-Latrobe Group oil and
gas discoveries at Basker-1 and Manta-!. A total of 21 individual
hydrocarbon bearing sandstones were intersected by the two wells. These
reservoir sand bodies were deposited by fluvial processes in a lower
coastal plain environment. The modelling of sand body orientation and
geometry is a critical component in the evaluation of the two
accumulations. Seismic resolution of the thin (average 2m to 5 m) sand
bodies is inadequate for mapping their orientation and distribution.
Dipmeter data has been successfully applied to the problem of orienting
the sand bodies using FMS images acquired during the drilling of
Gummy-! and reprocessed HDT data from Basker-1 and Manta-!.
Prediction of lateral extensiveness (geometry) of individual sand bodies
has also been attempted. Interpreted palaeocurrent direction from all
three wells is dominantly from the NW to the SE. Reservoirs in the
Manta-1/Gummy-1 area are interpreted to be predominantly channel
sands, deposited by relatively low sinuosity streams. As such they would
tend to have a laterally extensive, elongate geometry. Sand bodies
deposited in the Basker-1 area show a predominance of laterally accreted
cycles deposited by meandering streams. Channel geometry may then be
limited in the downstream/upstream direction by internal permeability
barriers such as clay plugs.