Influence of Mercury Injection Pressure on Lower Limits Analysis of Tight#br#
Sandstone Reservoirs

doi:10.11885/j.issn.1674-5086.2013.08.29.06

Abstract

Abstract:

The minimum flow pore throat radius method is often used to determine the lower limits of porosity and permeability
of tight sandstone gas reservoirs. This method is based on mercury intrusion method. It can determine the lower limits
by quantitative analysis of relationship between micro pore structure and permeability. Researches indicate that high mercury
injection pressure may affect rock pore structure，which triggers the pondering over whether mercury injection pressures influences
lower limits and how to choose appropriate mercury injection data to acquire lower limits suitable for practical geological
situation. These problems have not been deeply discussed by far. So this paper focuses on these problems，taking the tight
sandstone reservoirs in P area of the central part of Sichuan Basin as an example. The research results show the lower limit of
porosity determined by minimum flow pore throat method falls when the selected mercury injection pressure rises from 30 MPa
to 200 MPa. The calculated results and production testing results are in good agreement when the mercury injection pressure is
close to the formation pressure.

Key words: mercury injection pressure, minimum flow pore throat radius, lower limits, central part of Sichuan Basin, tight
sandstone gas reservoirs

CLC Number:

TE132

Li Ye*, Sima Liqiang, Wu Feng, Huang Dan, Li Qing. Influence of Mercury Injection Pressure on Lower Limits Analysis of Tight#br# Sandstone Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.08.29.06.

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Influence of Mercury Injection Pressure on Lower Limits Analysis of Tight#br# Sandstone Reservoirs

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