h is gross thickness multiply by NTG to get the netgross thickness

A drainage area of the well, for instance, since we bet the N for the well only

i belive you was asking about the well not the reservoir!

it is an assumption to solve for drainage area so from the volume we get the area V = A*h

for porous materials, V = A*h*por*So as pore volume

i hope it is clear, i belive if you read some spe papers it can help

i have some that would really better explain

i will uplaod them to 4 shared, i will share the link

if you dont mind remind me by a post to my forum mail




good luck