柯克亚原油与沙参二井原油对比及油源探讨

A CORRELATION BETWEEN CRUDE OILS FROM KOKYAR, XINJIANG AND SHASHEN No. 2 WELL——AN EXPLORATION OF OIL SOURCES

柯克亚原油中含γ-羽扇烷,没有C_(30,24)-丙基胆甾烷,灰份的钒/镍比值低,因而被推断为陆相原油,可能来自中下侏罗统地层。 沙参二井原油中不含γ-羽扇烷,但含有C_(30,24)-丙基胆甾烷,碳同位素值偏低,灰份中的钒/镍比值高,因而被推断为海相原油,它可能来自古生代海相碳酸盐岩地层。

It is postulated from the presence of γ-lupane and the lack of C30,24-propyl cholestane in crude oils from Kokyar, Xinjiang and low V/Ni ratios in ashes that these oils terrestrial in origin, probably from the Middle-Lower Jurassic strata.Crude oils from the Shashen No. 2 well contain no γ-lupane but C30,24 -propyl cholestane, and have low charbon isotope values and high V/Ni ratios in ashes, providing evidence suggest-ing that these oils are marine in, origin and probably derived from the Paleozoic marine carbo-nate strata