Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (4): 40-46.doi: 10.3969/j.issn.1673-8926.2015.04.006

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Dolomite genesis of Carboniferous Huanglong Formation ineastern Sichuan Basin

Liu Shiyu1，2， Hu Mingyi1，2， Hu Zhonggui1，2， Dai Weiyan1，2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources ， Ministry of Education ， Yangtze University ，Wuhan 430100 ， China ； 2. School of Geosciences ， Yangtze University ， Wuhan 430100 ， China
  • Online:2015-07-20 Published:2015-07-20

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Abstract:

The Carboniferous Huanglong Formation in eastern Sichuan Basin is an important producing formation for natural gas. Dolomitization is a requirement for the development of high quality reservoir, and the research of genetic types for dolomite has important meaning for oil and gas exploration. Based on core observation and outcrop description, combined with thin section analysis data, it is considered that Huanglong Formation mainly developed the following types of dolomite: mud-microcrystalline dolomite, powder to fine-grained dolomite and residual particles powder to fine-grained dolomite as well as dolomite cement filling in pores, holes and cracks. On the basis of the data of X ray diffraction analysis and geochemical characteristics of stable isotope δ13C and δ18Ο, it is found that formation conditions and physical characteristics of different types of dolomite in the study area exhibit different characteristics, and it’s more reasonable to use different origin types for the explanation. Four kinds of genetic model of dolomite of Huanglong Formation were summarized, including: diagenetic dolomitization evaporation pump model for mud-microcrystalline dolomite, burial diagenetic dolomitization compaction model for （residual particles） powder to fine-grained dolomite, diagenetic adjustment dolomitization model for freshwater dolomite and construction hydrothermal dolomitization diagenetic model for abnormal morphology dolomite.

Key words:  tight oil, geologic characteristics, exploration status, Bakken Formation, Yanchang Formation, Lucaogou

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