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Volume 33 Issue 2
Jun.  2014
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Article Navigation >  CARSOLOGICA SINICA  > 2014  >  33(2): 248-254
HUO Yong, PANG Qiu-wei, LUO Shun-she, ZHAO Bo-quan, YAO Ya-bin. Geochemical characteristics of a paleokarst-reservoir in Ordovician Majiagou formation in southern Jingbian tableland[J]. CARSOLOGICA SINICA, 2014, 33(2): 248-254.
Citation: HUO Yong, PANG Qiu-wei, LUO Shun-she, ZHAO Bo-quan, YAO Ya-bin. Geochemical characteristics of a paleokarst-reservoir in Ordovician Majiagou formation in southern Jingbian tableland[J]. CARSOLOGICA SINICA, 2014, 33(2): 248-254.
shu

Geochemical characteristics of a paleokarst-reservoir in Ordovician Majiagou formation in southern Jingbian tableland

  • 1.

    Tarim Division, China Petroleum Logging Co. LTD

  • 2.

    College of Geoscience，Yangtze University

  • 3.

    Oil and Gas Evaluation Center, China Petroleum Logging Co.LTD

  • Received Date: 2013-09-09
  • Publish Date: 2014-06-25
    Abstract
  • The nicer karst reservoirs were formed at the top of the Ordovician Majiagou formation in Ordos basin due to tectonic uplift and erosion during the Caledonian movement.Based on analysis of δ13C and δ18O in dissolution pore fillings, karst breccia cements and carbonate rocks, the results showed that,(1)The δ18O value of various types of rocks is lower than that of the Ordovician seawater in study area while the δ13C value of weak karstification original rock is similar to that of Ordovician seawater;(2)With intensified karstification, the δ18O and δ13C of rocks decreased, and the δ18O value was more sensitive;(3)Fillings in dissolved pore and bedrock formed in the same fluid source, which should be the synsedimentary product of karst. In the paper, based on the values of Sr and the analytic of Sr/Ca, Sr/Ba and B elements which responded to the diagenetic fluid salinity, it may be concluded that there was a large freshwater input into the study area. The low Sr content and high Fe2+/Fe3+ value illustrated that sediments had undergone burial karstification.

     

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