Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (6): 56-61.doi: 10.3969/j.issn.1673-8926.2011.06.010

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Sedimentary characteristics and evolution of Paleogene Lower Xiaganchaigou Formation in northern Mahai area, northern margin of Qaidam Basin

SUN Guoqiang1， XIE Mei2， ZHANG Yongshu2， ZHAO Mingjun2， KANG Jian2， SHI Jian1   

  1. 1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2 . Research Institute of Exploration and Development， PetroChina Qinghai Oilfield Company， Dunhuang 736202， China
  • Online:2011-12-20 Published:2011-12-20

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Abstract:

Based on the analysis of sedimentary sequence, cores, grain size, well logging data, the sedimentary characteristics and evolution of Lower Xiaganchaigou Formation of Paleogene in northern Mahai area，northern margin of QaidamBasin，were studied. The result shows that the Lower Xiaganchaigou Formation displays an obvious regression, and the sedimentary facies is mainly braided fluvial facies. The study on sedimentary systems demonstrates the sedimentary facies distribution and evolution rule more clearly, which provides reliable geologic information for the next exploration activity.

Key words: crude oil wax precipitation, heavy oil reservoir, effective development, hot water drive, fire flood

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