By means of the theory elastic wave, this paper demonstrates direct field's being offset under fluid fluid matrix by secant integral in well.

The growth share matrix has been blamed for persuading companies to focus obsessively on market share. In a world where markets are increasingly fluid, this can blind them to the bigger picture.

The matrix pores in coal play a little role in fluid flow, therefore the permeability derived from well test is the reflection of the percolation flow capacity in cleat system.