Publication Name: The Cooper & Eromanga Basins Australia
Authors: S. Greaves and E. Surka
Date Published: June 1989
Number of Pages: 23
Reference Type: Book Section
Abstract:
Authority to Prospect (ATP) 299P(2) is located in the south-west Queensland portion of the Eromanga Basin.Since the initial commercial oil discovery at Tintaburra in 1983, a discovery success rate of 60 per cent has been
achieved by the Operator, Hartogen Energy Limited and its Joint Venturers.
The producing reservoirs in the permit are the Wyandra Sandstone Member, the Murta Member, the Westbourne and Birkhead Formations, and the Hutton Sandstone.
Concentration of seismic data acquisition and associated processing in the north-west has resulted in the delineation and drilling of numerous four-way, fault-independent structural closures.
Subsequent exploration drilling, however, was significant in presenting differing aspects of geophysical and
geological problems including:
(a) mapping of seismic reflectors at reservoir level and delineation of fluvial channel facies as in the Birkhead
Formation in the Cranstoun Field;
(b) drilling of wells in a crestal position on faultindependent closures mapped at both top Cadna-owie
horizon and top basement horizon but reservoiring oil only in the Wyandra Sandstone Member of the Cadnaowie
Formation as in the Ipundu and Tarbat Fields;
(c) integration of dynamite data with various vintages of Vibroseis f data; and
(d) seismic misties due to poor statics control and/or phase differences between surveys.
Addressing these problems has required the application of specific seismic reprocessing and log analysis techniques. These include detailed log and dipmeter analyses, seismic inversion processing, phase shifting and spectrum analyses. Acquisition of additional uphole data was also essential. This has enabled assumptions to be made and conclusions drawn about velocity and facies variations in the permit.