GEOL 1151 Lecture Notes - Lecture 7: Gas Chromatography, Petroleum Geology, Aerial Photography
Document Summary
Rate of return & payout, initial cost, and comparison on project. Stratigraphy [used to correlate the age of the rocks from place to place] Sequence stratigraphy [sea level lows, sea level rises, or sea level highs to estimate the target reservoir rocks] Aerial photography [satellite data, seep data, gravity/magnetic surveys] Well logs [ 3 types: electrical, neutron/acoustic, natural gamma ray" etc. ]: higher = more sandy, knower where fluids are] Kerogen i = shallow-water, oxygen-deficient lagoons and lakes; fresh water algae; mostly oil. Kerogen ii = marine settings; phytoplankton (animals); oil and gas; most common. Kerogen iii = proximity to land is mandatory; vascular plants; mostly gas. A porous and permeable lithological unit which retains migrating hydrocarbons. Gas floats on oil and oil floats on water. To analyze, use: stratigraphy, structural analysis, sedimentology, palaeontology. 5 important drive mechanisms: solution gas drive, gas cap drive, water drive, gravity drainage, combination/mixed drive.
