petroleum exploration
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Legacy product - no abstract available
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Legacy product - no abstract available
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Legacy product - no abstract available
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Interpretation of new aeromagnetic data
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The northern marine region of Australia has been selected by the Department of the Environment and Water Resources (DEW; with statutory and policy responsibility for MPAs) and other stakeholders (Commonwealth of Australia, 2007) as a possible location for the establishment of marine parks. This report examines the petroleum prospectivity of the proposed region, with an assessment undertaken by Geoscience Australia. The northern marine assessment region is located offshore on the northern shelf of Australian, extending from the Torres Strait to the NT/WA state boundary. Geologically the region encompasses three provinces; 1) the Timor Sea, 2) the Arafura Sea and 3) the Gulf of Carpentaria. These areas were assessed separately due to different development histories, sedimentary fill and associated prospectivity.
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Small Angle Neutron Scattering (SANS), Rock-Eval pyrolysis and total organic carbon (TOC) analyses were carried out on 165 organic-rich Upper Jurassic-Lower Cretaceous sedimentary rock samples from nine wells in the Browse Basin (Adele-1, Argus-1, Brecknock South-1, Brewster-1A, Carbine-1, Crux-1, Dinichthys-1, Gorgonichthys-1 and Titanichthys-1). Cutting samples and some sidewall cores have been used. Out of the total 165 samples, 47 samples (22 for Brewster-1A and 25 for Dinichthys-1) were also analysed using the Ultra-small Angle Neutron Scattering (USANS) technique. The focus of the study was to identify potential Lower Cretaceous source rocks and the depth at which the onset of hydrocarbon generation occurred in each well, and to determine the onset of hydrocarbon expulsion in the wells for which USANS data were available.
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Restricted on advice from A. Barrett
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Restricted on advice from A. Barrett
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Restricted on advice from A. Barrett
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A significant limitation of conventional seismic reflection technology is that it poorly constrains seismic velocities in the deep part of the section. These velocities are needed for seismic migration, to convert from time to depth, and to estimate the likely rock composition at depth. Seismic observations at large offsets can compensate for this limitation. The Australian Geological Survey Organisation recorded high-quality refraction and wideangle reflection seismic data using ocean-bottom seismographs (OBS) along 5 profiles on Australia's North West Shelf, to maximum offsets of 300 km. The OBS transects coincide with previously acquired deep-crustal seismic-reflection profiles. Consequently, velocity information can now be derived from two independent data sets: common-depth point (near-vertical) reflection data and refraction/wide-angle reflection data.