Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 80-85.doi: 10.3969/j.issn.1673-8926.2016.02.011

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Sedimentary environment of Lower Triassic Baikouquan Formation in Mahu Sag, Junggar Basin: A case study from Ma 18 well

Li Xing1， Zhang Liqiang1， Shi Hui2， Zheng Yiding1   

  1.  1. School of Geosciences ， China University of Petroleum ， Qingdao 266580 ， Shandong ， China ； 2. Institute of Geology and Geophysics ， Chinese Academy of Sciences ， Beijing 100029 ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

The ancient sedimentary environment of clastic rock directly controls the type, distribution and evolution of sedimentary facies, which affects the distribution of high quality reservoir and favorable oil and gas area. The geochemical characteristics of element were used to analyze the sedimentary environment of clastic rock reservoir, and portable X-ray fluorescence （XRF） tester was applied to systematically test the contents of more than 40 elements from 415 groups of samples of Lower Triassic Baikouquan Formation in Ma 18 well in Mahu Sag in the northwestern margin of Junggar Basin. The geochemical characteristics of elements and the changing trend of paleoclimate, paleosalinity and oxidation-reduction states of the sedimentary environment were analyzed. The results show that element content and ratio have certain fluctuations from bottom to top, while in overall, it was formed in the warm and humid, freshwater, brackish water, weak layering and oxidizing environment. In addition, from T1b1  to T1b3 , the water temperature, humidity and salinity all have a tendency to increase, and the Si/Al ratio has a certain positive correlation with oil saturation.

Key words: virtual wells technology , PETREL-RE technology , segmentation and integration technology , numerical simulation , history matching , Longhupao Oilfield

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