The average percentage of pore space in the reservoir rock that is used for storage of natural gas in the subject field.
The Average Porosity is manually entered in the Gas Storage Field Summary. The value was originally obtained from the Field Operator, and subsequently reported in either IGS Special Report 01, Underground storage of natural gas in Indiana, 1963 or <IGS Special Report 59, Underground storage of natural gas in Indiana (revised), 1998> .
Dawson, T. A. and G. S. Carpenter,1963, Underground storage of natural gas in Indiana: Indiana Geological Survey, Special Report 01, 29 p.
Keller, S. J., 1998, Underground storage of natural gas in Indiana: Indiana Geological Survey, Special Report 59, 77 p.