Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 82-86.doi: 10.3969/j.issn.1673-8926.2015.03.012

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Discovery of bitumen of Yingshan Formation in GL3 well of Tarim Basin and its geologic significance

 MA Qingyou， TIAN Peng， LU Haitao， SHA Xuguang   

  1.  Research Institute of Exploration and Development ， Northwest Oilfield Company ， Sinopec ， Urumqi 830011 ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

Great number of soild bitumen have been found in Yingshan Formation from GL3 well in Guchengxu Uplift of Tarim Basin. It occurred in the vug and fissure of micritic calcarenite and dolomitic limestone. Based on the analyses of core observation, micrograph and coefficient of reflection, we found that bitumen has many characteristics of clear boundary, insoluble in chloroform, no fluorescent display, with coefficient of reflection ranging from 2.76% to 2.85%. This characteristics are similar to pyrobitumen resulted from paleo-reservoir cracking. The discovery of bitumen in Yingshan Formation in GL3 well has two major geological significances: （1） the difference of wave impedance between bitumen development segment and wall rock may be the main reason for string beads reflection in Yingshan Formation in GL3 well, and can cause a deviation of reservoir prediction of; （2） through the analysis of inclusion thermometry, origin of bitumen and gas, burial history and hydrocarbon generation history, we reconstructed the accumulation process of the paleo-reservoir in GL3 well. We can divide the process into two phases: Middle-Late Caledonian paleoreservoir formation and Late Himalayan paleo-reservoir cracking to gas and transforming to pyrobitumen. It is of certain significance to deepening the study of reservoir forming conditions of Guchengxu Uplift.

Key words: pyrobitumen, paleo-reservoir, string beads reflection, accumulation process, Yingshan Formation, Tarim Basin

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