Study on the Movable Fluid Saturation and its Influencing Factors of
Low Permeability Volcanic Gas Reservoir

doi:10.11885/j.issn.1674-5086.2012.02.16.02

Abstract

Abstract:

In view of the factors that the diagenetic mechanism of volcanic reservoir is different from the conventional depositional
sandstone reservoir，the micro-pore structure of the volcanic is more complex than that of sandstone reservoir. The movable
fluid saturation of Xushen，Changling and Dixi volcanic gas reservoirs were systematically studied by using the centrifugal
experiment，NMR，constant-rate mercury injection and CT technology. The experimental results indicate that the suitable centrifugal
force used to obtaining the irreducible water saturation in centrifugal experiment is 2.76 MPa. The micro-distribution
feature of the movable fluid corresponding to different permeability reservoir is different. The larger the permeability，the
greater the proportion of the movable fluid controlled by the larger throat. 0.100 mD is one of the critical permeability values
when the reservoir permeability larger or less than it，the micro-distribution feature of the movable fluid is different. The average
of the movable fluid saturation of the three gas reservoir is 23.62%. The CT image and constant-rate mercury injection
experimental results suggested that the reservoir fracture and pore-to-throat ratio are the main factors affecting the movable
fluid saturation.

Key words: low permeability volcanic gas reservoir, movable fluid saturation, centrifugal experiment, nuclear magnetic
resonance, fracture

Liao Zuocai1，2, Sun Junchang3, Yang Zhengming2，3, Xiong Shengchun3, He Ying3. Study on the Movable Fluid Saturation and its Influencing Factors of
Low Permeability Volcanic Gas Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.02.16.02.

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