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Micro-speleothem structures developed in peritidal carbonates by erosion and deposition from water of a carbonate-depositing spring. Features of both microbial and abiogenic mineralisation are present. Fisherman Bay, South Australia. Photo: Robert Burne. References Awramik S.M. and Buchheim H.P. (2012). The quest for microbialite analogs to the South Atlantic Pre-Salt carbonate hydrocarbon reservoirs of Africa and South America: Proceedings of the Houston Geological Society Joint General and International Di.n.ner Meeting. Houston, Texas, 18
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Very large hydrocarbon accumulations have been discovered in carbonate reservoirs in palaeo-lacustrine environments in pre-salt proto-Atlantic sag and rift basins offshore of Brazil and Angola. Recent studies bring us closer to answering key questions of the relative roles of biotic and abiotic mineralisation in forming the reservoir lithologies cu...
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... structures ( Figure 2) are found in water-filled cenotes in the vicinity of Mount Gambier (Thurgate, 1996). A very different environment in which complex carbonates form with micro-speleothemic structures, pisolites and cryptomicrobial structures (Figure 3), are found associated with springs in the peritidal zone of Fisherman Bay, South Australia ( Ferguson et al., 1982) and in the widely distributed mound springs of the Lake Eyre Basin (Keppel, 2013). This basin lies 15 metres below sea level, and the formation of carbonate mounds from artesian-fed springs might represent a currently unexplored analogue for aspects of the lithology and palaeogeographical setting of some of the pre-salt reservoirs. ...
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