Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 42-47.doi: 10.3969/j.issn.1673-8926.2016.03.007

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Hydrothermal activities of Ordovician and its significance for alteration to carbonate reservoirs in Yubei area

Zhu Songbai1， Wang Hongfeng1， Wang Shengjun1， Zhou Yan2， Zhao Zhengchao1， Wu Jingqing1   

  1. 1. Kuqa Oil and Gas Development Management ， PetroChina Tarim Oilfield Company ， Korla 841000 ， Xinjiang ， China ；2. School of Geoscience and Technology ， Southwest Petroleum University ， Chengdu 610500 ， China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

 The alterations of deep hydrothermal fluids to carbonate reservoirs have gradually drawn much attention,and have become a new field for hydrocarbon exploration of deep carbonate reservoirs. Based on the analyses of cores, thin sections, cathodoluminescence, SEM, geochemistry and inclusion thermometry, the hydrothermal activities of Ordovician in Yubei area of Tarim basin were studied. The results show that silicification and dissolved pores can be observed in the dolomite of Ordovician, and some drusy quartz and dolomite can be found in pores of the dolomite. Dolomite with wavy extinction, saddle dolomite, as well as barite and pyrite filled in intercrystalline pores also can be seen via thin sections and SEM. Compared with ordinary dolomite, the siliceous dolomite contains relatively enriched Ce and Eu, with high content of Ba, Zn and low content of Sr. The carbon and oxygen isotopic composition of the siliceous dolomite is relatively lower and the ratio of n （ 87 Sr ） to n （ 86 Sr ） is higher than that of the ordinary dolomite, and the homogenization temperature and salinity of fluid inclusions also are relatively high.Combined with the regional basement faults, it is believed that hydrothermal activities exist in Ordovician in this area, and dissolved pores are produced in these events, which means a prospective significance for the exploration of Ordovician deep dolomite.

Key words: source rocks, hydrocarbon generation kinetics, Lucaogou Formation, Jimusar Sag, Junggar Basin

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