GEOL 2530 Lecture Notes - Lecture 7: Craton, Sequence Stratigraphy, Petroleum Reservoir

• School: University of Manitoba
• Department: Geological Sciences
• Course: GEOL 2530
• Professor: Chow Nancy

Document Summary

Facies - body of rock with specific characteristics lithofacies. Walther"s law of correlation of facies facies within conformable successions reflect laterally adjacent environments facies associations. Depositional surface of a given age -- time line. Revised model: asymmetrical t-r cycles regressive successions common, thick transgressive successions rare, thin. Correlation = demonstrating equivalency of strat. units: lithocorrelation, biocorrelation, chronocorrelation. Lithocorrelation methods: direct tracing, (a) lithologic similarity. Variety of lithologic properties succession of units problem: (b) stratigraphic position relation to distinctive unit(s: well logs. 6 major lithostratigraphic units - t-r cycles. 10s million years duration for each cycle. Larry sloss (1960s) & researchers at exxon (1970-1980) e. g. carboniferous t-r cycles. Different scales of sedimentary cycles related to eustatic sl changes. Criteria for formalizing stratigraphic units: appropriate name. Local geographic name + rank or descriptive term. Reference sections: unit description - distinguishing features, publication in recognized scientific medium.