GEOPHYSICAL EXPLORATION IN THE SOUTH AUSTRALIAN PORTION OF THE MURRAY BASIN

Abstract

Gravity and seismic surveys conducted over a number of years in the South Australian portion of the Murray Basin are discussed in chronological sequence and related to the geology. Little is known of the pre-Tertiary geology of the area from outcrop or drilling but the geophysical work suggests a development of 7,000 feet of pre-Tertiary sediments in the deepest part, north-west of Renmark. The presence of Permian in this section, interpreted from seismic refraction results has been confirmed by the drilling of A.O.G. North Renmark No. 1. Permian deposition may extend as far north-west as Canegrass Station. Gravity anomalies bear a close relationship to thickness of sedimentary section as interpreted from refraction results.