Shale is not Porous because it is a sedimentary rock.,
of course it's not true ,shale is a porous rock but it's pores are not connected in other words it's not permeable .here is a reason for that:
http://www.kgs.ku.edu/Dakota/vol1/petro/petro04.htm
(to a depth of 50 ft the formation is made of shale and it's porosity is around 50 percent
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