东营凹陷生油岩中介形虫氧、碳同位素的古湖泊学意义

刘传联; 赵泉鸿; 汪品先

Volume 26 Issue 5

Sep. 2001

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Article Navigation > Earth Science > 2001 > 26(5): 441-445

Liu Chuanlian, Zhao Quanhong, Wang Pinxian, 2001. PALEOLIMNOLOGICAL SIGNIFICANCE OF CARBON AND OXYGEN ISOTOPIC RATIOS OF OSTRACODA FROM OIL SOURCE ROCKS IN DONGYING DEPRESSION. Earth Science, 26(5): 441-445.

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PALEOLIMNOLOGICAL SIGNIFICANCE OF CARBON AND OXYGEN ISOTOPIC RATIOS OF OSTRACODA FROM OIL SOURCE ROCKS IN DONGYING DEPRESSION

Laboratory of Marine Geology of Tongji University, Shanghai 200092, China

Received Date: 2000-05-29
Publish Date: 2001-09-25

Abstract

Abstract

Stable-isotopic analyses of 27 ostracoda samples from oil source rocks in Dongying depression (Bohai Gulf basin, East China) have been carried out. The results show that the δ(¹⁸O) of the ostracoda is negative and the δ(¹³C) is positive except one sample (δ(¹⁸O) : -4.853×10^-3 to -0.341×10^-3; δ(¹³C) : -0.360×10^-3 to 2.961×10^-3), which displays the characteristics, highly correlated in covariance between oxygen and carbon isotopic variations (r=0.92). This characteristics is similar to the stable oxygen and carbon isotopic compositions of primary carbonates from modern hydrologically closed lakes. Therefore, we concluded that the paleolake during the oil source rocks deposition in Dongying depression is a closed saline or brackish lake. Based on the vertical variation of δ(¹⁸O) and δ(¹³C), the changes of the paleoclimate, paleolake level and paleoproductivity have been discussed. In the early stage of oil source rocks deposition, the climate was dry, the lake level, lower and the productivity, high, but it became wet, and the high water level and lower productivity occurred in the late depositional period.
- oxygen and carbon isotope,
- ostracoda,
- oil source rocks,
- paleolimnology

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References(14)

References

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