塔河油田中下奥陶统岩溶缝洞方解石碳、氧、锶同位素地球化学特征

刘存革; 李国蓉; 朱传玲; 刘国勇; 卢宇峰

Volume 33 Issue 3

May 2008

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Article Navigation > Earth Science > 2008 > 33(3): 377-386

LIU Cun-ge, LI Guo-rong, ZHU Chuan-ling, LIU Guo-yong, LU Yu-feng, 2008. Geochemistry Characteristics of Carbon, Oxygen and Strontium Isotopes of Calcites Filled in Karstic Fissure-Cave in Lower-Middle Ordovician of Tahe Oilfield, Tarim Basin. Earth Science, 33(3): 377-386.

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Geochemistry Characteristics of Carbon, Oxygen and Strontium Isotopes of Calcites Filled in Karstic Fissure-Cave in Lower-Middle Ordovician of Tahe Oilfield, Tarim Basin

1.
Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249, China
2.
Key Laboratory for Hydrocarbon Accumulation, Ministry of Education, Beijing 102249, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
4.
Northwest Company of SINOPEC, Urumqi 830011, China
5.
PetroChina Jidong Oilfield Company, Tangshan 063004, China

Received Date: 2007-08-12
Publish Date: 2008-05-25

Abstract

Abstract

For discussing the geochemistry characteristics of paleokarstic products of Lower-Middle Ordovician in Tahe oilfield, and evaluating the areas influenced by different stages of paleokarst, the carbon, oxygen and strontium isotopes of karstic fissure-cave calcites have been systematically analyzed.The carbon and oxygen isotopes of different attitude calcites are characterized by meteoric water karst, and the early paleokarstic products are featured with enriched ¹³C and lower ⁸⁷Sr/⁸⁶Sr ratios.The wide ranges of δ¹³C and high ⁸⁷Sr/⁸⁶Sr ratios are the characteristics of early Herlynian paleokarst, and both have wide ranges of δ¹⁸O.The areas covered with O3s Formation are enriched with more ¹³C than those of north areas, indicating the increased proportion of ¹³C from the host rock.And another reason is the higher δ¹³C of early paleokastic products.Under the influence of the early Herlynian paleokarst, the strontium isotopes of different attitude calcites are heavier than the background values, indicating the join of the terrestrial strontium.The features of heavier strontium in north areas are lower than those of the areas covered with O₃s Formation, indicating the increased proportion of the dissolved strontium from the wall rock.According to the regional variations of carbon, strontium isotopes and geologic background, the early Herlynian paleokarst exerted important impact on the carbonate rocks of the Lower-Middle Ordovician in the north areas and the areas covered with O3s Formation, and it is the main karst episode of Tahe oilfield and also the main formation episode of reservoir.
- Tarim basin,
- Tahe oilfield,
- Lower-Middle Ordovician,
- paleokarst,
- carbon and oxygen isotopes,
- strontium isotope

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References(61)

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Geochemistry Characteristics of Carbon, Oxygen and Strontium Isotopes of Calcites Filled in Karstic Fissure-Cave in Lower-Middle Ordovician of Tahe Oilfield, Tarim Basin

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