Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (3): 55-59.doi: 10.3969/j.issn.1673-8926.2011.03.011

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Study on physical property of Chang 611 reservoir in Wangyao area, Ansai Oilfield

WANG Fang1， ZHANG Chunsheng1， XIAO Menghua2， LI Li1， ZHAO Enzhang1   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources， Ministry of Education， Yangtze University， Jingzhou 434023， China； 2. Research Institute of Henan Oilfield Company， Sinopec， Nanyang 473132， China）
  • Online:2011-06-20 Published:2011-06-20

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Abstract:

Based on cast thin section, scanning electronic microscope and mercury penetration curves, the petrological characteristics, pore type, pore texture characteristics, reservoir properties and influencing factors of Chang 611 reservoir are systematically studied, and the favorable exploration target areas are pointed out. Through the comprehensive evaluation, it is considered that arkose is the main sandstone type of Chang 611 reservoir, and the pore types include primary intergranular pore, dissolved intergranular pore, dissolved intragranular pore and micro-fracture. The plane porosity of cast thin section of the sandstone reservoir ranges between 0.98% and 1.37%, the average throat radius is low, and the reservoir is of typical middle-low porosity and low permeability. The main factors that influence the reservoir properties are sedimentary environment and diagenesis.

Key words: high resolution sequence stratigraphy, electrofacies analysis, base level cycles, Xiasiwan area, Ordos Basin

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