Basics of Petroleum Geology

Aug 13th, 2016
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Arkansas State University Mountain Home
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basics about rock structure, surface rocks, cap rocks etc

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INTRODUCTION TO PETROLEUM GEOLOGYApplication of Geoscience to the exploration anddevelopment of oil and natural gasOil and Gas = Naturally Occurring Hydrocarboncompounds derived from biogenic sedimentOrganic Sediment: Marine vs. Non-MarineBitumen soluble organic matterKerogen insoluble organic matterMarine Organics: algal, soft parts, petroleum generationTerrestrial Organics: woody plants, gas generationMixed Marine-Terrestrial: waxy oil-gas mixConditions for petroleum accumulation:1. Organic source rock2. Sediment burial and thermal maturation (heating over time)3. Permeable and Porous reservoir rock to store fluids4. Cap rock or impermeable seal to contain buoyant fluids5. Favorable geometric arrangement between reservoir and sealHistorical Perspectives1859 Drakes Well Titusville,PennsylvaniaCable Tool DrillingVenango Sands ReservoirGreeks & Europeansthrough 17th century;petroleum collectionsat seeps and springsEarly exploration method: drill the creeks and anticlinesElemental composition of crude oil by weight%Hydrocarbon Compounds in Petroleum:> 200 organic carbon-based compounds1. Paraffins: gaseous at surface temperatures2. Napthenes: liquid at surface temperatures3. Aromatics: ring-based compounds4. Asphaltics: heavy oil and tarName: Basics of Petroleum GeologyDescription:basics about rock structure, surface rocks, cap rocks etc

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