<p>Geoscience Australia's Oracle organic geochemical database comprises analytical results for samples relevant to petroleum exploration, including source rocks, crude oils and natural gases collected across the Australian continent. The data comprises organic chemical analyses of hydrocarbon-bearing earth materials as well as including connectivity to some inorganic analyses. These data enable petroleum fluids to be typed into families and correlated to their source rock, from which depositional environment, age, and migration distances can be determined, and hence the extent of the total petroleum system can be mapped. This comprehensive data set is useful to government for evidence-based decision making on natural resources and the petroleum industry for de-risking conventional and unconventional petroleum exploration programs. <p>The data are produced by a wide range of analytical techniques. For example, source rocks are evaluated for their bulk compositional characteristics by programmed pyrolysis, pyrolysis-gas chromatography and organic petrology. Natural gases are analysed for their molecular and isotopic content by gas chromatography (GC) and gas chromatography-temperature conversion-mass spectrometry (GC-TC-IRMS). Crude oils and the extracts of source rocks are analysed for their bulk properties (API gravity; elemental analysis) and their molecular (biomarkers) and isotopic (carbon and hydrogen) content by GC, gas chromatography-mass spectrometry (GCMS) and GC-TC-IRMS. <p>The sample data originate from physical samples, well completion reports, and destructive analysis reports provided by the petroleum industry under the Offshore Petroleum and Greenhouse Gas Storage Act (OPGGSA) 2006 and previous Petroleum (submerged Lands) Act (PSLA) 1967. The sample data are also sourced from geological sampling programs in Australia by Geoscience Australia and its predecessor organisation's Australian Geological Survey Organisation (AGSO) and Bureau of Mineral Resources (BMR), and from the state and territory geological organisations. Geoscience Australia generates data from its own laboratories. Other open file data from publications, university theses and books are also included <b>Value:</b> The organic geochemistry database enables digital discoverability and accessibility to key petroleum geochemical datasets. It delivers open file, raw petroleum-related analytical results to web map services and web feature services in Geoscience Australia’s portal. Derived datasets and value-add products are created based on calculated values and geological interpretations to provide information on the subsurface petroleum prospectivity of the Australian continent. For example, the ‘Oils of Australia’ series and the ‘characterisation of natural gas’ reports document the location, source and maturity of Australia’s petroleum resources. Details of the total petroleum systems of selected basins studied under the Exploring for the Future project can be found in the Petroleum Systems Summaries Tool in Geoscience Australia’s portal. Related Geoscience Australia Records and published papers can be obtained from eCat. <b>Scope:</b> The collection initially comprised organic geochemical and petrological data on organic-rich sedimentary rocks, crude oils and natural gas from petroleum wells drilled in the onshore and offshore Australian continent. Over time, other sample types (ground water, fluid inclusions, mineral veins, bitumen) from other borehole types (minerals, stratigraphic – including the Integrated Ocean Drilling Program), marine dredge samples and field sites (outcrop, mines, surface seepage samples) have been analysed for their hydrocarbon content and are captured in the database. Results for many of the oil and gas samples held in the Australian National Offshore Wells Data Collection are included in this database.

In response to numerous enquiries by petroleum exploration personnel on the availability of geochemical information, a new data base – ORGCHEM – has been created. This new database is based on the relational database management system ORACLE. ORGCHEM integrates non-BMR and BMR-generated geochemical data. Within ORGCHEM the locality data includes basin, well, formation, and depth, while the geochemical data information covers Rock-Eval, organic carbon content, and vitrinite reflectance values. This is basic data relevant to organic maturation levels, source richness, and source type, and is of primary importance to petroleum exploration personnel involved in assessing the petroleum prospectiveness of an area or modelling petroleum generation. The bulk of the non-BMR-generated information is derived from well-completion reports acquired by BMR through past and present Government regulatory Acts, PSSA, and PSLA (pre-1980 offshore wells only). From these sources over 12,000 records have been compiled. The Organic Geochemistry Facility within the Onshore Sedimentary and Petroleum Geology Program has undertaken the task of extracting the remaining geochemical data from post-1980 PSLA-acquired well-completion reports. ORGCHEM also contains all organic geochemical and isotopic information produced within the BMR since 1982. The principle source of this information is from organic geochemical investigations undertaken within the Organic Geochemistry Facility. Already ORGCHEM contains over 4000 records of ‘in-house’ generated data. Concurrently with this data accumulation phase, links with PEDIN (Petroleum Data Exploration Index) are being developed to enable interested persons to perform user-pay customised retrieval of open-file geochemical data for specific, basinal, or regional studies. Published in the BMR Research Newsletter 13.

Geoscience Australia's Oracle organic geochemical database comprises analytical results for samples relevant to petroleum exploration, including source rocks, crude oils and natural gases from both onshore and offshore basins. The data is non-confidential and available to the petroleum industry, research organisations and the public. The data are produced by a wide range of destructive analytical techniques conducted on samples submitted by industry under legislative requirements, as well as on samples collected by research projects undertaken by Geoscience Australia or other government agencies or institutions. Some of the results have been generated by Geoscience Australia's laboratory, whereas other data is compiled from service company reports, well completions reports and published papers. <b>Value: </b>These data comprise the raw organic geochemistry values generated for Australian source rocks, crude oil and natural gases and is the only public comprehensive database at the national scale. The raw data are used as input to other studies, such as petroleum systems modelling, resource assessments and national mapping projects. Derived datasets and value-add products are created based on calculated values and interpretation to provide information on the subsurface petroleum prospectivity of the Australian continent. The data collection aspires to build a national-scale understanding of Australia's oil and gas resources. <b>Scope: </b>This data collection is useful to government for evidence-based decision making on natural energy resources and the petroleum industry for de-risking conventional and unconventional exploration programs. Results for many of the oil and gas samples held in the Australian National Offshore Wells Data Collection are included in this database.