Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 115-121.doi: 10.3969/j.issn.1673-8926.2015.03.018

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Logging evaluation methods of source rocks of tight oil of Upper Ganchaigou Formation in Zhahaquan area

ZHENG Xi 1，2， ZHANG Xiaoli 1，2， WANG Guomin3， DU Jiangmin 1，2，4， ZHANG Zijie 1，2， ZHONG Gaorun 1，2   

  1.  1. State Key Laboratory for Continental Dynamics ， Northwest University ， Xi ’ an 710069 ， China ； 2. Department of Geology ，Northwest University ， Xi ’ an ， 710069 ， China ； 3. Research Institute of Exploration and Development ， PetroChina Qinghai Oilfield Company ， Dunhuang 736202 ， Gansu ， China ； 4. College of Resources ， Shijiazhuang University of Economics ， Shijiazhuang 050031 ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

 In recent years, there have been found large-scale distribution of tight oil reservoir in the lower member of Upper Ganchaigou Formation（N1g） in Zhahaquan area of Qaidam Basin, but the source-reservoir configuration is not clear. So it has an urgent need to establish effective source rock evaluation method. Based on source rock coring materials and comparative analysis of laboratory data with conventional logging response, the resistivity, acoustic and Uranium are proved to be the sensitive parameters reflecting the organic matter abundance of source rocks. ΔlgR method and Uranium-TOC regression method were used to establish qualitative and quantitative interpretation model. At the same time, the method of evaluating the organic matter abundance through Litho Scanner was explored. The quantitative interpretation model according to Uranium-TOC regression method is proved to be the most efficient way to reflecting the change trend of TOC of the lower member of Upper N1g in Zhahaquan area, and the calculation is simple and convenient, so it can provide a reliable basis for evaluating the source rocks of the tight oil in this area. The calculation accuracy of TOC according to Litho Scanner is slightly lower affected by the geological condition of this area, but this method is not controlled by regional environmental factors, and can be widely used in fine interpretation of lithology and source rocks of reservoirs in different areas.

Key words:  tight oil reservoir, source rock, logging response, interpretation model, lower member of Upper Ganchaigou Formation, Zhahaquan area, Qaidam Basin

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