Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (6): 66-71.doi: 10.3969/j.issn.1673-8926.2012.06.012

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Fracture characteristics of the Triassic Yanchang Formation in the midwest of Ordos Basin

LIU Weigang1， ZHOU Lifa1， GAO Shujing2   

  1. 1. Department of Geology， Northwest University， Xi’an 710069， China； 2. The Second Geophysical Exploration Team， Shaanxi Bureau of Geology and Mineral Resources， Xi’an 710016， China
  • Online:2012-12-20 Published:2012-12-20

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Abstract:

The Triassic Yanchang Formation is the main layer for oil and gas exploration in Ordos Basin and it mainly belongs to low porosity and super-low permeability reservoir. The development stages and characteristics of fractures greatly affect the hydrocarbon migration, accumulation and reservoir forming, and also control the later reformation of the reservoir. Based on the fracture data interpreted fromFMI and STARII imaging logging data, combined with drilling core observation, this paper synthetically analyzed the development characteristics of fractures. It was found out that there mainly developed high angle fractures and vertical fractures of the Triassic Yanchang Formation in the midwest ofOrdos Basin, the principal fracture orientation concentrates on near EW, NE, near SN and NW, and the fractures randomly distributed in longitudinal direction in the study area. This paper also analyzed the controlling factors of fracture development, and it is considered that lithology and strata thickness are the dominant factors which influence the development degree of fractures ofYanchangFormation in this area.

Key words: compacted sandstone, gas reservoir recognition, well log, open flow capacity, Tai 2member, DaniudiGas Field

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