Ion Diffusion Behavior between Fracturing Water and Shale and Its Potential Influence on Production

Table 1

Mineral concentrations (wt%) of the shale samples as determined by X-ray Diffraction.

Sample	Shale
Calcite	6
Quartz	44
Dolomite	3
Pyrite	3
Feldspar	2
Illite	23
Chlorite	12
Illite/smectite	7