Integrated Reservoir Characterisation Using High Definition Frequency Decomposition, Multiattribute Analysis and Forward Modelling. Chandon Discovery, Australia

Abstract

Reservoir characterisation using advanced seismic techniques can mitigate risk and enhance hydrocarbon exploration. This study presents an integrated reservoir characterisation of the Triassic Mungaroo Formation in the Yellowglen-Chandon gas discoveries based on formation evaluation, structural analysis, and stratigraphic expression using wireline log interpretation, core description, a synthesis of regional studies, application of structural and stratigraphic seismic multi-attribute analysis, and development of high-definition frequency decomposition. An initial stage of data conditioning covered noise cancellation and spectral enhancement. The stratigraphic analysis from frequency decomposition and attribute combination revealed the position and geometries of fluvial channels, the main reservoir architectural element. Iso-proportional slicing confirmed the presence of these geo-bodies throughout the vertical extent of the reservoir and supported the reconstruction of the tectonostratigraphic history. Characterisation involved the identification of hydrocarbon accumulations. Rock-physics and seismic forward modelling tested the veracity of these identified accumulations and corroborated their existence. Forward modelling is indeed effective in predicting the frequency response of new prospect geobodies in undrilled areas, by establishing reasonable assumptions of elastic properties and gas saturation values. The end product was the identification of issues and strengths regarding the petroleum system elements and the comparison between Chevron volumetrics and the ones derived by this study.