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Study on pore structure changes during shale hydration
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DOI：10.1080/19386362.2026.2676618.png)
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Abstract
En 中文
Fracturing fluid contacting shale reservoirs triggers spontaneous imbibition and clay hydration, altering shale matrix structures and causing fracture generation or blockage, which hinders reservoir evaluation and production planning. Taking Sichuan Basin shale cores as research objects, this study conducted imbibition, clay hydration, pore testing and well soaking experiments to clarify matrix and fracture evolution during imbibition. The results indicate montmorillonite and illite water absorption and expansion dominate shale imbibition. Clay hydration deformation lags hydration stress, with dual effects on fracture extension. Montmorillonite's sustained hydration promotes fracture propagation. The optimal soaking time is 30 days for montmorillonite-rich Block B and 20 days for illite-rich Block A.
Keywords:
Water-rock interaction
natural seepage
clay swelling
pore structure
stewed wells
Journal
I
IF:
1.3
Papers:
61
Citations:
1.7K
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