Pore structure and gas migration characterization of tight sandstone in Kuqa depression of Tarim basin

doi:10.7523/j.issn.2095-6134.2014.01.016

Abstract

Abstract:

This study focuses on the pore structure and gas migration in tight sandstone reservoir in Kuqa depression of Tarim basin, based on microscopic observation and laboratory experiments. Results indicate that main pore types of tight sandstone in the study area are disslolved pores and slot pores, and the pore-throat radiuses are about 0.1 μm; there is no obvious correlation between permeability and porosity; gas migration in tight sandstone requires a certain starting pressure gradient; and the process of gas migration and accumulation in tight sandstone can be divided into the following three stages: accumulation of gas bubbles, formation of continuous state gas, and migration of the continuous state gas through pore system.

Key words: tight sandstone, migration, pore structure, Kuqa depression

CLC Number:

P618.13

FAN Junjia, ZHOU Haimin, LIU Shaobo. Pore structure and gas migration characterization of tight sandstone in Kuqa depression of Tarim basin[J]. , 2014, 31(1): 108-116.

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