CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN

ZHANG Zhenwei; DING Hansheng; ZHANG Yajin

doi:10.16562/j.cnki.0256-1492.2016.02.007

2016 Vol. 36, No. 2

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ZHANG Zhenwei, DING Hansheng, ZHANG Yajin. CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2016, 36(2): 59-64. doi: 10.16562/j.cnki.0256-1492.2016.02.007

Citation:

ZHANG Zhenwei, DING Hansheng, ZHANG Yajin. CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2016, 36(2): 59-64. doi: 10.16562/j.cnki.0256-1492.2016.02.007

CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN

Exploration and Development Science Research Institute of Daqing Oilfiled Company Ltd., Daqing 163712

Received Date: 22 July 2015

Revised Date: 20 September 2015

Abstract

Abstract

The Lower Ordovician carbonate reservoirs in the Gucheng region of the Tarim Basin are mainly gas plays. 51carbonate rock samples collected from the Well GC7, 8, 9 and 12 are analyzed for carbon and stable oxygen isotopes. The results demonstrate that the δ13C fluctuates from -2.26‰ to 1.55‰(PDB), and the δ18O from -10.57‰ to -4.69‰(PDB). The Mn/Sr is less than 2 or 3. It suggests that the original ratios of C and O isotopes are well preserved. As δ13CPDB values have positive correlation with sea-levels, the results indicate a regression period in Early Ordovician.
- Lower Ordovician /
- carbonate rocks /
- carbon and oxygen stable isotope /
- sea-level changes /
- Gucheng region

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References

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