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Table 5.1. Preliminary assessment of wells of the southeast Bowen Basin area.
Well
(north-to-south)
Base of
Precipice
Sandstone (m)
Top of
Permian
Section (m)
Triassic
Reservoir
Potential?
Permian
Reservoir
Potential?
Juandah-1 1457 1994 No No
Gurulmundi-1 1250 Not enough data No No
Dulacca-1 1629 Not enough data Not enough data Not enough data
Auburn-1 1618.5 Not enough data Not enough data Not enough data
Miles-1 1228 Not enough data Not enough data Not enough data
Columboola-1 1167 1185 No Not enough data
Tey-1 1626 1626 No Not enough data
Bennett-1 1714.5 1716 No Not enough data
Undulla-1 1725 1737 No Minor Potential
Leichhardt-1 1771 1790 No Not enough data
Alick Creek-1 Not present 1640 No Minor Potential
Tara-1 Not present 1639 No Not enough data
Cabawin East-1 2384 3194 No Not enough data
Cabawin-1 2326 3007 Minor Potential Minor Potential
Tartha-1 2185 Not enough data No Not enough data
Southwood-1 2082 2249 No No
Cabawin-1 is the only well to have intersected a significant hydrocarbon accumulation. There are
several potential sandstone–conglomerate reservoir intervals in the Triassic section of the well,
which are thicker here than in any other part of the study area (Figure 5.1). These intervals have
better porosity and permeability characteristics than others in the study area, and are generally
composed of quartz and chert pebbles with minor ash. However, there is doubt about the volume
of CO 2 that could be injected since these sandstones have not been intersected in off-set wells.
There are no obvious regional sealing units in this area, however a thickness of poor quality
(in terms of reservoir) Triassic sequence could act as a significant baffle to vertical migration.
Figure 5.1. Generic geological cross-section of the southeast Bowen Basin area. The cross-section shows
distribution and thickness of Permian and Triassic sediments from north-to-south in the southeast Bowen Basin.
Wells from north-to-south: Juandah-1 (also representing Gurulmundi-1, Dulacca-1, Auburn-1), Columboola-1
(also representing Miles-1), Undulla-1 (also representing Tey-1, Bennet-1, Leichhardt-1), Alick Creek-1 (also
representing Tara-1), Cabawin East-1, Cabawin-1, Tartha-1, Southwood-1.
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