Abstract
Strontium isotopic studies were made on Cenozoic formations in Japan in order to demonstrate the applicability of Sr isotope stratigraphy for petroleum exploration. The conclusions are summarized as follows:1) Sr isotope stratigaraphy using calcareous foraminiferal tests is a powerful method for the dating of Early Oligocene to Recent marine sediments.2) This method has several advantages over biostratigraphic methods because only small amounts of calcareous foraminifera, which are benthonic and planktonic speicies with a long range, can be used for analysis.3) Sr isotope stratigraphy in combination with well data, including microfossils and physical well logs, promises to be a tool for high resolution stratigraphic analysis.4) Abundant and characteristic species with relatively good preservation shoud be measured to eliminate dropped foraminifera from shallower depth intervals.5) Continuous and systematic measurements ensure the reliability of Sr isotope ages and the detection of the isotopic alteration of samples.
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