Petroleum and Coal Geology
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The northern Lawn Hill Platform (nLHP) is considered an emerging region with less than 15 wells drilled to date. With renewed interest in unconventional gas, new exploration opportunities exist in this early Proterozoic region. Petroleum systems analysis is presented here to improve the understanding of burial history, source rock richness and maturity of the nLHP of the Isa Superbasin, far NW Queensland. A pseudo-3D geological model was built and calibrated, in combination with 1-D burial and thermal history modelling of Desert Creek 1 and Egilabria 1. These were combined with source rock characteristics (e.g., Rock Eval and kerogen kinetics) which helped assess the hydrocarbon generation potential by source rock, allowing a broader assessment of petroleum prospectivity of the nLHP. The study focussed on two potential source rocks; the Lawn 4 Sequence and the River Supersequence. Maturity modelling of the Lawn 4 Sequence at Desert Creek 1 and Egilabria 1 predicted equivalent vitrinite reflectance (EqVR) of over 1.2% and 2%, respectively. The River Supersequence was modelled as overmature at both wells. Combining these results with the pseudo-3D model and source rock characteristics demonstrates that the highest maturities are encountered in the deepest depocentres to the east and gradually decrease in maturity to the west, indicating some potential for wet gas. Modelling results show generation of varying amounts of gas and oil from each potential source rock. Overall, due to the age of the sediments, maximum depth of burial and high paleotemperatures, the most likely hydrocarbon phase is gas from primary generation and supplemented by secondary gas from oil cracking. In spite of high maturities, encouraging gas shows from the Egilabria prospect support continued exploration interest in this region for unconventional hydrocarbons.
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The Cooper Basin is a late Carboniferous-Middle Triassic intracratonic basin in northeastern South Australia and southwestern Queensland. The basin is one of Australia's premier onshore hydrocarbon producing provinces and, by providing domestic gas for the East Coast Gas Market, is nationally significant. This study reviews the distribution, quality and maturity of source rocks across the Cooper Basin and forms part of Geoscience Australia's source rock program. All publicly-available total organic carbon (TOC) content and Rock-Eval pyrolysis data for the Cooper Basin were compiled into a single database, quality checked and compiled by well and formation to highlight the multiple viable source rock units throughout the Permian. The Toolachee and Patchawarra formations represent the principal source rocks in the basin. These comprise coals and carbonaceous shales deposited in fluvial deltaic and peat swamp environments and show good to very good oil and gas source potential. Additional source intervals include the gas prone lacustrine Roseneath and Murteree shales, as well as coals and carbonaceous shales of the Daralingie and Epsilon formations. Permian source rock distribution was investigated using lithofacies mapping combined with geochemistry data. Lithofacies maps published for South Australia were integrated with electrofacies data from Queensland to produce new, internally consistent, net source thickness maps for key intervals, including coals and carbonaceous shales of the Toolachee and Patchawarra formations, and the Roseneath and Murteree shales. Pyrolysis data that indicate the presence of an in-situ source rock with remaining hydrocarbon generation potential (i.e. TOC > 2% and S1+S2 > 3 mg hydrocarbons/g rock) were mapped by formation, demonstrating the broad extent of Permian source rocks across the basin. Toolachee and Patchawarra source rocks are present in most major depocentres, including the Windorah Trough and Ullenbury Depression in the northern part of the basin, where maximum coal thicknesses still reach more than 10 m. Source rocks within the Roseneath and Murteree shale are generally restricted to the southern Cooper Basin.
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The Australian Gas Distribution Licences Dataset is comprised of data acquired from state government, state/territory energy regulators, and company websites; and 'State of the Energy Market 2007' published by the Australian Energy Regulator (AER). The dataset is maintained on an ongoing basis, with source material acquired from company websites and state/territory agencies. Each gas distribution licence has information containing the following attributes; Lic_Number, Location, State, Network_Len, Asset_Base, Owner, Operator, Lic_Start, Lic_Expire, Lic_Update, Source1. This dataset has been developed in conjunction with a number of related datasets including electricity distribution licences, and gas and electricity retail licences.
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The Australian Biofuel Production Plants dataset is comprised of publicly available biofuel data sourced from a combination of government and industry websites. Both biodiesel and bioethanol plants are included. The dataset is maintained on an ongoing basis, with source material acquired from company websites and state/territory agencies. Each biofuel production plant has information containing the following attributes; NAME, LOCATION, STATE, COMPANY, STATUS, FUEL_TYPE, FEEDSTOCK, ANN_CAP, BBLPD, COMMENTS, SOURCE1, SOURCE2, SOURCE3.
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The Liquid processing facilities of Australia dataset is a combination of a digital data acquired from Petroleum and Marine Division (PMD) and an extensive web search. The dataset is maintained on an ongoing basis, with source material acquired from company websites and state/territory agencies. Each processing unit has information containing the following attributes; NAME, PROJECT, LOCATION, STATE, TYPE, PRODUCT, BY_PRODUCT, STATUS, COMMISSION, OWNER, OPERATOR, PROD_TPD, MAX_TPD, COMMENTS, SOURCE1, SOURCE2, SOURCE3 This dataset has been developed in conjunction with a number of related datasets including gas processing, gas storage, gas pipelines and offshore production platforms. This dataset was designed to create a new liquid processing dataset for Geoscience Australia.
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The offshore production platforms of Australia dataset is a combination of digital dataset acquired from Petroleum and Marine Division (PMD) and an extensive web search. The dataset is maintained on an ongoing basis, with source material acquired from company websites and state/territory agencies. Each offshore facility has information containing the following attributes; NAME, PROJECT, BASIN, STATE, STRUCTURE, TYPE, PRODUCT, STATUS, COMMISSION, OPERATOR, WELLS_Y_N, OIL_WELLS, GAS_WELLS, MANNED, FIELD,GOING_TO, DEPTH_M, TANKER_DWT, OIL_TBBLPD, H2O_TBWPD, FLUID_TBFPD, COND_MCFPD, LPG_TBBLPD, GAS_MCFPD, OIL_TBBL, BUTANE, PROPANE, CONDENSATE, COMPRESSN, REINJECTN, GAS_LIFT, H2O_INJECT, COMMENTS, SOURCE1, SOURCE2 This dataset has been developed in conjunction with a number of related datasets including gas processing, gas storage liquid processing and gas pipelines. This dataset was designed to combine Geosciences' offshore platform with more attributes sourced from the internet.
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Maps, plots and data sheets of average source rock richness, quality and maturity for five Mesozoic time slices are presented for offshore Northwest Australia (Carnarvon to Arafura basins). These maps/data facilitate regional assessment of the source rock potential of the region, and provide a framework for future exploration of the region's petroleum systems. The maps were compiled at a scale of 1:3 million, and are supplemented by two-way-time isopach maps for each time slice derived from interpretation of Geoscience Australia's regional seismic grid of the area (approximately 35,000 line km). Age vs TOC, S2 and HI, and source rock crossplots were also compiled from screened raw Rock-Eval pyrolysis data and displayed as inserts in the maps. The maps and open-file data used in the compilation of the maps can be viewed directly, or printed as a hard copy.
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The Coorabin coalfield bore and shaft sites are listed. A short description is given of each site.
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The Australian Petroleum Source Rocks Mapping project is a new study to improve our understanding of the petroleum resource potential of Australia's sedimentary basins. The Permian source rocks of the Cooper Basin, Australia's premier onshore hydrocarbon producing province are the first to be assessed for this project. Quantifying the spatial distribution and petroleum generation potential of these source rocks is critical for understanding both the conventional and unconventional hydrocarbon prospectivity of the basin. Source rock occurrence, thickness, quality and maturity are mapped across the basin and original source amount and quality maps prior to the onset of generation are calculated. Source rock property mapping results and basin specific kinetics are integrated with 1D thermal history models and a 3D basin model to create a regional multi-1D petroleum systems model for the basin. The modelling outputs quantify both the spatial distribution and total maximum hydrocarbon yield for ten source rocks in the basin. Monte Carlo simulations are used to quantify the uncertainty associated with hydrocarbon yield and to highlight the sensitivity of results to each input parameter. The principal source rocks are the Permian coals and carbonaceous shales of the Gidgealpa Group, with highest potential yields from the Patchawarra Formation coals. The total generation potential of the Permian section highlights the significance of the basin as a world class hydrocarbon province. The systematic workflow applied here demonstrates the importance of integrated geochemical and petroleum systems modelling studies as a predictive tool for understanding the petroleum resource potential of Australia's sedimentary basins.
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Historical data concerning the operations and findings at the Coorabin coalfield between 1915 and 1937 has been compiled in this report.