AIM: To ascertain whether existing seismic data obtained from beneath the Pebble Point Formation could be upgraded so that the primary reservoir, the Waarre Sandstone, might be mapped with a greater degree of confidence in the southern part of the licence area. METHODS: Survey dates: 28 March - 6 April 1990. Energy source: Vibroseis. CDP coverage: 6000%.> Recording mode: 120 channel digital - MDS-14 recorder. SP interval: 25.0m; group interval: 25.0m. 3 reflection lines totalling 43.4 kms were acquired in the Kongorong area southwest of Mount Gambier. One traverse, line KO90-3, was recorded over the same shotpoints as the 1985 Burrungule Seismic Survey line BU85-40, to facilitate a direct comparison between data previously recorded from the area and that from the 3 new lines. It was also decided that line BU85-40 would be reprocessed in conjunction with the processing of the 1990 Kongorong data to assist with comparisons between the acquisition parameters of the 1985 and the new survey data. RESULTS: The 1990 experimental survey interpretation concluded that a substantially greater seismic exploration effort (in the form of 3-D seismic acquisition) would be required in PEL 28 to map deep drilling targets like the Waarre Sandstone. Mapped Waarre reservoir attributes at present are highly conjectural, due partly to complex subsurface structural geology associated with the dense faulting and numerous volcanic features found in the southern part of the licence area. Furthermore, the current lack of well control requires another deep stratigraphic well to properly identify deeper reflectors showing on the latest seismic sections.