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Rock Mechanics and Rock Engineering

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21.12.2019 | Original Paper

Experimental Investigation of the Effect of Salt Precipitation on the Physical and Mechanical Properties of a Tight Sandstone

verfasst von: Dujie Zhang, Yili Kang, A. P. S. Selvadurai, Lijun You

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 10/2020

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Abstract

Salt precipitation in rocks is a strongly coupled physico-chemical process, which has implications on natural gas extraction efficiency. The paper examines the effect of salt precipitation on porosity, permeability, permeability-stress sensitivity and elastic wave velocities of the rock matrix in tight sandstone with high salinity. Results show that the porosity and permeability decrease significantly after salt precipitation, and the permeability-stress sensitivity was aggravated by the salt precipitation. Following salt precipitation, the elastic wave velocities decreased significantly, the dynamic Young’s modulus of the rock decreased, and the dynamic Poisson’s ratio increased. Microstructural analysis suggests that following salt precipitation, the smaller pores and pore throats become the main seepage channels. The crystalline salt was deposited in the pores, the micro-fractures and on the surface of clay minerals, which not only reduces porosity and permeability, but contributes to the development of secondary cracks that weaken the rock matrix.

Vorheriger Artikel Experimental Study on Nano-/Microparticles Transport to Characterize Structures in Fractured Porous Media

Nächster Artikel Dynamic Mechanical Properties of Dry and Water-Saturated Siltstones Under Sub-Zero Temperatures

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Titel: Experimental Investigation of the Effect of Salt Precipitation on the Physical and Mechanical Properties of a Tight Sandstone
verfasst von: Dujie Zhang
Yili Kang
A. P. S. Selvadurai
Lijun You
Publikationsdatum: 21.12.2019
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 10/2020
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-019-02032-y

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