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Abstract The New Guinea Limestone Group was deposited across much of New Guinea, including the Indonesian provinces of West Papua and Papua, as part of a widespread shallow-water carbonate platform during the Paleogene and Neogene. This platform was drowned beneath deeper-water strata from the Middle to Late Miocene. Review of biostratigraphic and seismic data from the Aru Basin, offshore New Guinea, reveals a drowning succession c. 600 m thick deposited during a drowning event that lasted around 4 Ma. The objective of this study was to create a well-to-seismic tie from a single well in the study area using biostratigraphic, seismic and log data. The well-to-seismic tie was built to constrain a new velocity model to better image the drowned carbonate platform and understand the reservoir potential of the drowning succession in the zone of interest using two complimentary techniques: seismic reservoir characterization and numerical stratigraphic forward modelling. The well-to-seismic tie was achieved by matching significant biostratigraphic events, such as unconformities, with seismic horizons using stratigraphy-to-seismic. Modern stratigraphic and seismic reservoir characterization techniques, including stratigraphy-to-seismic, numerical forward modelling, velocity model building, rock physics and seismic inversion, were applied to predict rock properties such as lithology and porosity within the drowning succession.
Unravelling evidence for global climate change in Mississippian carbonate strata from the Derbyshire and North Wales Platforms, UK
Detecting Hydrothermal Pyritic Zones along Bald Eagle Ridge Using Induced Polarization
The mantle redox state; An unfinished story?
We review mantle redox models and present new data for xenolithic and megacrystic intrinsic oxygen fugacity (IOF) studies from varied geologic settings. The roles of fluid inclusions, carbon, autoreduction, auto-oxidation, Ti 3+ , crystal defects, disproportionation, metasomatism, and gravity are examined with regard to their possible influences on redox data. In several IOF studies, the geothermometric determination for a multimineral sample yields very close temperature concordance with totally different geothermometric techniques; these specific studies mandate some confidence in the IOF f O 2 values obtained. Also of high confidence are the IOF data that come from nearly flawless, gem-quality megacrysts (GQ) of various silicates. Both types of these high-confidence IOF data indicate that the redox state of the mantle is nearer the wüstite-iron (WI) buffer than the quartz-fayalite-magnetite (QFM) buffer. The f O 2 data of the ilmenite-containing xenolithic assemblages that have either been calculated (Eggler, 1983), IOF-measured (Arculus and others, 1984), or gas mixture-equilibrated (McMahon, 1984) have all shown reasonable overlap in f O 2 -T values, and all indicate that these samples come from a mantle region more like (QFM). The ilmenitic xenoliths subjected to IOF analysis in our laboratory have exhibited auto-oxidation and therefore are difficult to interpret unequivocally. The high-confidence IOF data do argue strongly for mantle redox inhomogeneity, but much more work is needed to establish whether there is a general systematic redox decrease with depth into the mantle, on which the observed redox inhomogeneity is superimposed.