
TY  - JOUR
A1  - Auld, K. 
A1  - Thomas, B. 
A1  - Goodall, J. 
A1  - Benson, J. 
T1  - THE JOHN BROOKES GAS DISCOVERY&#x2014;AN EVOLVING STORY
JF  - The APPEA Journal
JO  - The APPEA Journal
Y1  - 2002
VL  - 42
IS  - 1
SP  - 443
EP  - 459
KW  - 
UR  - https://doi.org/10.1071/AJ01024 
N2  - John Brookes&#x2013;1 was drilled as part of a work commitment for the WA-214-P Joint Venture in 1998 and discovered an 85 m gross dry gas column. The objective of the well was to test a structural closure at the base of the Muderong Shale regional seal on the Tryal Rocks anticline, up-dip from Tryal Rocks&#x2013;1, drilled in 1970. Tryal Rocks&#x2013;1, the 31st offshore well to be drilled within the Carnarvon Basin, WA, was initially considered a dry hole. However, a review of the well data in 1997&#x2013;98 suggested that Tryal Rocks&#x2013;1 might contain a hydrocarbon column. The mapping of the structure using initially 2D seismic data acquired post Tryal Rocks&#x2013;1, then 3D data, indicated that Tryal Rocks&#x2013;1 was drilled within closure, but off crest, and that significant closure existed up-dip. The John Brookes&#x2013;1 location was selected to test this updip potential. The John Brookes&#x2013;1 discovery confirmed the validity of the structural mapping. However, the unexpected nature of the reservoir, interpreted as a well developed turbiditic channel of Birdrong Sandstone age, changed the emphasis from purely structural to a play with structural/stratigraphic potential. An amalgamated turbidite complex model was invoked which infers that the John Brookes&#x2013;1 reservoir represents a confined channel system cut into the underlying substrate. This model explains the results to date, with the John Brookes&#x2013;1 gas reservoir being in direct continuity with the sandstones at Tryal Rocks&#x2013;1. A review of the 3D seismic data across the field and seismic modelling support the stratigraphic model developed from the palynological interpretation. 
ER  -

