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ABSTRACT: Sedimentological and Geostatistical Characterization of Reservoir Heterogeneities of the Triassic Fluvial and Lacustrine-Deltaic Sequences, Gunnedah Basin, NSW.

FENG XU JIAN and IAN J. TAGGART, Centre for Petroleum Engineering, University of New South Wales, Australia

Fluvial and deltaic sequences are major hosts of large amounts of hydrocarbon in the world. Although quantitative characterization of reservoir heterogeneities of these sequences is the primary basis for planning enhanced oil recovery and reservoir simulation, such studies are still limited to small areas and academic circles. Previous studies on characterization of fluvial and deltaic sequences have been concentrated either on limited outcrops to investigate facies geometries, relationship between facies and permeability patterns based on mini-permeameter measurements, or on stochastic modeling of fluvial and distributary channel sand bodies. The objective of this paper, different from previous ones, is to integrate sedimentology with geostatistics to study reservoir heterogeneities f the Triassic fluvial and lacustrine-deltaic sequence in the Gunnedah basin, New South Wales, based on drill cores and wireline logs.

The lacustrine-deltaic sequence in the basin is made up of four sandy- and thickening-upward sequences which stack together to form a large scale coarsening-upward sequence. Laterally, sequences dominated by distributary mouth bar and delta front facies in proximal areas change to sequences made up mainly of offshore lake and pro-delta facies. The fluvial sequence in the basin were formed by braided streams. This paper will compare the results of traditional geological mapping and that of both kriging and fractal geostatistical mapping for these two contrasting sequences.


AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)