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  • A suite of 18 oils from the Barrow Island oilfield and a reference oil from Saladin-11 (Carnarvon Basin, Australia) have been analysed compositionally in order to determine the detailed effect of minor to moderate biodegradation on C5 to C9 hydrocarbons. Carbon isotopic data for individual low molecular weight hydrocarbons was also obtained for 6 of the oils. The Barrow Island oils came from different production wells, reservoir horizons, and compartments, but have a common source (the Upper Jurassic Dingo Claystone Formation). Ratios based on hopanes, steranes, alkylnaphthalenes and alkylphenanthrenes indicate thermal maturities of about 0.8% Rc for most of the oils. The co-occurrence in all the oils of relatively high amounts of 25-norhopanes with C5 to C9 hydrocarbons, aromatic hydrocarbons and cyclic alkanes implies that the oils are the result of multiple charging, with a heavily biodegraded charge being overprinted by fresher and more pristine oil. The later oil charge was itself variably biodegraded, leading to significant compositional variations across the oilfield which help delineate compartmentalisation. Biodegradation resulted in strong depletion of n-alkanes (>95%) from most of the oils. Benzene and toluene were partially or completely removed from the Barrow Island oils by water washing. However, hydrocarbons with lower water solubility were either not affected by water washing, or water washing had only a minor effect. etc etc (not enough space for all the Abstract)

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • The data have been derived from 1:250 000 scale NATMAP, NTMS, Royal Army Survey Corps Joint Operations Graphics, and TASMAP maps. The NATMAPs were created from EPS files which are by-products of the map production process. The remaining maps were scanned. All maps have been georeferenced to the Map Grid of Australia. Resolution is at 200 dpi and supplied in 24 bit (16 million) colour. The map images are available as a 2-CD set.

  • This map is part of the series that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5 km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Each standard map covers an area of 1.5 degrees longitude by 1 degree latitude or about 150 kilometres from east to west and 110 kilometres from north to south. There are about 50 special maps in the series and these maps cover a non-standard area. Typically, where a map produced on standard sheet lines is largely ocean it is combined with its landward neighbour. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours (interval 50m), localities and some administrative boundaries. The topographic map and data index shows coverage of the sheets. Product Specifications Coverage: The series covers the whole of Australia with 513 maps. Currency: Ranges from 1995 to 2009. 95% of maps have a reliability date of 1994 or later. Coordinates: Geographical and either AMG or MGA (post-1993) Datum: AGD66, GDA94, AHD. Projection: Universal Traverse Mercator (UTM) Medium: Paper, flat and folded copies.

  • Several novel series of branched alkanes have recently been detected in several Proterozoic (Officer Basin, Australia; Spitzbergen, Greenland) and Cretaceous (Eromanga Basin, Australia) sediments. Four C2n series and two C3n series were present in the very complex aliphatic fractions obtained from Neoproterozoic aged Munta sediments of the Officer Basin. The C2n series, also detected in the Spitzbergen sediments, are tentatively assigned as 5,5-diethylalkanes (e.g., Figure 1, Structure I), 6,6-diethylalkanes (II), 5-butyl,5-ethylakanes (III) and 6-butyl,6-ethylakanes (IV), with all showing strong odd or even carbon number preferences.