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Type: Thesis
Title: Sequence stratigraphy, facies architecture and petroleum potential of the Roseneath, Epsilon, and Murteree Formations in the Cooper Basin, Australia
Author: Guo, Fengtao
Issue Date: 2018
School/Discipline: Australian School of Petroleum
Abstract: The Permian Roseneath Shale, Epsilon Formation, and Murteree Shale comprise a ~ 140 m thick succession (informally known as the REM strata) within the Cooper Basin of South Australia and Queensland. This succession hosts important conventional and unconventional gas plays. An integrated study of the sedimentology, facies architecture, sequence stratigraphy, and related geochemical data allows an understanding of the paleogeographic evolution of the basins that provides a perspective on the petroleum potential of the REM strata. Previous studies of the REM strata have tended to be localised in nature whereas this study provides a regional perspective on the facies distribution, stacking patterns and regional sequence stratigraphic framework allowing a better understanding of the evolution of the sedimentary environments and the depositional trends. Cores from nine wells with a total length of in excess of 1400 m were logged. Twelve lithofacies were identified and were further categorised into eight facies associations. The REM strata are interpreted as a fluvial-deltaic-lacustrine system with glacial influences. The Roseneath and Murteree Shales were deposited in a widespread lake with dominant rhythmites and claystones whereas the Epsilon Formation formed in a transitional environment with a mixture of fluvial, deltaic, shoreface and mire environments. Sequence stratigraphic analysis indicates that the REM strata were deposited within two 1st-order Transgressive-Regressive (T-R) sequences that can be further separated into four sequence units: SU1, SU2, SU3, and SU4. 2nd-order transgressive and regressive cycles are present within each stratigraphic unit. The depositional history of the REM is divided into four phases: I, II, III, and IV, which were mostly controlled by basin subsidence, lake level, and paleo-climate. Coals within the Epsilon Formation are characterised by low ash and sulphur content, and great continuity, which were most likely raised mires. The distribution of siderites and pyrites within the REM strata suggests that the Patchawarra Trough was likely a closed or restricted lake while the lake in the Nappamerri Trough may have had occasional connections with the marine realm to the east. Further elemental and isotopic analyses of siderites can reveal important information on marine influences. Petroleum plays with the REM strata are arguably part of a continuous gas accumulation and additional evidence is needed to confirm this hypothesis. The southern flank of the GMI Trend, east Nappamerri Trough, and some major basin highs are prospective areas for conventional structural, stratigraphic, and combination traps. Unconventional petroleum potential (shale gas, deep coal seam gas, and tight gas) is relatively limited in terms of current extraction techniques. Compared to North American shale gas plays, the Roseneath and Murteree Shales appear to be not as favourable for gas production due to the low organic content and high ductility. The potential of coal seam gas in the REM strata is limited by its ultra-deep burial and thin nature of the coal seams.
Advisor: McCabe, Peter
Bunch, Mark
Dissertation Note: Thesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2019
Keywords: Roseneath
Cooper Basin
sequence stratigraphy
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