回帖：In most cases, the keys for success are as follows,
(1)Three rock types. Tight coarse siltstone(type 1), middle grain size siltstone (TYPE 2)and organic-rich siltstone(Type 3). Type 2 is the target
(2) lamination types:
(A) Rock type1 + rock type 2
(B) Rock type1 + rock type 3
(C) Rock type2 + rock type 3

Lamination type A is the best one for production by fracking