A previous study demonstrated that when the formation of new small pores was larger than the transformation degree of small pores to large pores, the R a would show a decreasing trend. 31 To deeply explore the changed characteristics of micro-, meso-, and macropores before and after reaction with fracturing fluid, the percentage of each type of pore was calculated ( Figure 5 ).
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Impact of Pyrite Oxidation on the Pore-Structure Characteristics of Shale Reservoir Rocks under the Interaction of Fracturing Fluid.
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