Quantitative Evaluation of Micro Pore Throat Characteristics in Extra Low Permeability Sandstone Oil Reservoir of Yanchang Group in Ordos Basin Using Constant Rate Mercury Penetration Technique

Abstract:

Micro pore throat characteristics of extra low permeability sandstone oil reservoir of Yangchang group in Ordos basin are analyzed using constant rate mercury penetration technique. The results show that pore radius distributes similarly, in 100～200μm, peak values are about 140μm in extra low permeability sandstone oil reservoir. The lower the permeability is, the narrower the distribution ranges of throat are, content of smaller throats become high and variation is more sensitive to permeability, distribution ranges of pore throat radius ratio are wide and permeability has bigger influence on input mercury saturation of throat in extra low permeability sandstone oil reservoir. The difference of pore throat characteristics mainly depends on throat in extra low permeability sandstone oil reservoir. The impacts of pore and throat on total capillary curve are various to different permeability cores, Throat development should be paid more attention in middle or later stage of oil development to extra low permeability sandstone oil reservoir.

• Periodical: Advanced Materials Research (Volumes 361-363)
• Pages: 408-413
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.361-363.408
• Online since: October 2011
• Authors: Hui Gao, Wei Sun
• Keywords: Constant Rate Mercury Penetration, Extra Low Permeability Sandstone Oil Reservoir, Ordos Basin, Pore Throat Characteristics, Quantitative Evaluation

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