RASC/CASC: Example of Creative Application of Statistics in Geology |
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| Authors: | Di Zhou |
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| Institution: | (1) CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China |
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| Abstract: | RASC/CASC is a computer-based system for quantitative stratigraphic analysis developed by Agterberg, Gradstein, and co-workers.
The application of the system to the Neogene biostratigraphy of the Pearl River Mouth Basin demonstrates the advantages of
the system. The occurrence data of hundreds of fossils from dozens of wells are analyzed objectively based on established
stratigraphic and statistical rules embedded in the system. Through permutation of the score matrix, the optimum sequence
of fossil events is obtained. The calculation of inter-fossil distances allows the automated biostratigraphic zonation and
the age-event correlation. Then the regional geological timetable is constructed and the inter-well chronological correlation
and high-resolution subsidence analysis becomes possible, even for wells with incomplete fossil records. Uncertainty at each
step is quantified. While all these are important accomplishments in a stratigraphic study, results of the study also help
identify problems in allocation of fossil events and dating lithologic divisions. |
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| Keywords: | RASC/CASC quantitative stratigraphy Pearl River Mouth Basin South China Sea biozonation |
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