Journal of Petroleum Geology,
vol. 21(4),
October 1998, pp. 445-465
DIAGENESIS AND
RESERVOIR DEVELOPMENT OF SANDSTONES IN THE TRIASSIC REWAN GROUP, BOWEN BASIN, AUSTRALIA
A. Bashari*
The
non-marine Lower Triassic Rewan Group in the Bowen Basin, Australia, is mainly composed of
lithic arenites containing high proportions of volcanic rock fragments.Sublitharenites are
also present. The arenites are cemented by abundant authigenic quartz, carbonates and clay
minerals. Three separate lithostratigraphic intervals can be identified: a conglomeratic
unit at the base; a sequence dominated by lithic arenites in the middle; and a section
dominated by sub-litharenites at the top. Petrographically, the sandstones can be divided
into a facies whose quartz content is greater than 75% on a QFR diagram; and a labile or
lithic facies which contains less than 75% quartz. There is a progressive change in clay
mineral assemblage from one petrofacies to the other.
