LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (2): 83-91.doi: 10.3969/j.issn.1673-8926.2015.02.013

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Logging evaluation technology and application of tight tuff reservoir in Santanghu Basin

JIAO Lixin， LIU Juntian， LI Liuzhong， HAN Cheng， ZHANG Pin， LONG Fei   

  1. Logging evaluation technology and application of tight tuff reservoir in Santanghu Basin
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

 The tuff reservoir of Tiaohu Formation obtained industrial oil flow in many wells in Santanghu Basin, which makes it become a new hot field of exploration in Tuha Oilfield. Research shows that except tuff, the reservoir lithologies include biodetritus, charcoal and a few muddy strips, with some sedimentary characteristics, and the tuff has abundant organic carbon, with large thickness, as good source rocks. The reservoir porosity ranges from 5.5% to 24.0%, the permeability is generally less than 0.5 mD, and the average oil saturation is above 70%, so it belongs to tight tuff reservoir with large pores, ultra-low permeability and high oil saturation. Based on Δlog R logging technology, this paper carried out a quantitative evaluation of hydrocarbon source rocks; on the basis of rock slices and whole-rock mineral analysis, established and improved the identification methods and standards of tuff and mudstone by core logging; combined with core analysis, CT scanning and mercury capillary pressure data, studied microscopic characteristics of the reservoir; conducted effective reservoir evaluation and porosity calculation by combined logging data; on the basis of the reservoir lithology, carried out oil-bearing property evaluation, basically formed a set of techniques and methods of logging evaluation for tight tuff reservoir, and achieved good effects in production.

Key words:  sand body distribution, genetic types, controlling factors, Chepaizi area, Chunguang Oilfield

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