Two industry acquired diatomite cores (Sisquoc Formation) from the Orcutt (Newlove 76-RD1) and Casmalia Hills (Stokes A-30804) oil fields were analyzed by core descriptions, laboratory analysis (XRD and SEM), and gamma ray logs. Based on these data, five distinct lithofacies, nine sedimentary features and compositional trends of both cores were established. Newlove 76-RD1 and Stokes A-30804 record an upward-shallowing succession at different depositional positions on the Pliocene paleo-slope of the Santa Maria basin. Stokes A-30804 reflects slope deposition on a lower flank of a paleo-bathymetric high receiving higher detrital influx from inter-ridge troughs. Slope deposition of Newlove 76-RD1 was closer to a paleo-bathymetric high where purer diatomaceous sediments accumulated. Within Stokes A-30804, purer opal-A dominant lithofacies contain the highest oil saturations. The diagenesis and precipitation of opal-CT and abundance of phyllosilicate significantly hinders oil saturation within lithofacies.
|Advisor:||Behl, Richard J.|
|Commitee:||Francis, Robert D., Kelty, Tom|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 53/01M(E), Masters Abstracts International|
|Subjects:||Geology, Petroleum Geology, Sedimentary Geology|
|Keywords:||Casmalia Hills oil field, Diatomite cores, Orcutt oil field, Sisquoc Formation|
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