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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(5): 655-665
Wan Youli, Wang Jian, Wan Fang, Fu Xiugen, Wang Zhongwei, Shen Lijun. Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655
Citation: Wan Youli, Wang Jian, Wan Fang, Fu Xiugen, Wang Zhongwei, Shen Lijun. Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655
shu

Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin

doi: 10.11781/sysydz201705655
  • 1.

    Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land and Resources, Chengdu, Sichuan 610081, China

  • 2. Sedimentary Geology Research and Energy, Chengdu Center of Geological Survey, China Geological Survey, Chengdu, Sichuan 610081, China

  • 3. School of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074, China

  • Received Date: 2017-03-20
  • Rev Recd Date: 2017-08-23
  • Publish Date: 2017-09-28
    Abstract
  • The REE characteristics of different carbonate rock types were studied based on petrologic analyses of carbonate rocks from the Buqu Formation in ancient oil pools in the southern Qiangtang Basin. The carbonate rocks in the study area were classified into limestones, clay-dolomicrites, (residual) grain dolostones, crystalline dolo-stones and saddle dolomites. All kinds of carbonate rocks have a low REE content (∑REE), and some of the saddle dolomite samples have a higher ∑REE than limestones, indicating the mixing of outside liquids. Different carbonate rocks have different REE contents, but their distribution patterns are similar due to the standardization of surface waters of the Pacific Ocean. The LaN/YbN ratio averages 2.86, with a slight light rare earth concentration and a heavy rare earth loss. Light rare earth concentration degree decreases with the increase of dolomitization. The positive δCe anomaly (average 2.94) and positive δEu anomaly (average 1.43) showed that the Buqu carbonate rocks were deposited in an oxic environment. Dolomitization fluids mainly came from oceanic formation water in the same period. The diagenetic environment changed to reductive after hydrocarbon charging. At the end of Early Cretaceous, the Lhasa and Qiangtang blocks shear collided, helping atmospheric fresh water enter the Buqu Formation. Affected by the Cenozoic tectonic thermal event again, saddle dolomites were formed. Tectonic thermal events provided temperature conditions for Eu2+ concentration.

     

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