Abstract
Salt crystallization will block the pores and fractures of shale reservoirs. It is one of the important reasons for the rapid decline of shale gas wells' initial production. Pressure pulse decay tests show that shale permeability is significantly decreased due to salt crystallization. Salt crystallization primarily block macropores and natural fractures, resulting in an average permeability reduction rate of 79.26%. The major salt crystallization formed after the salt crystallization experiment is CaSO4, and the overall size of the crystallization is 30–50 μm.
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