| Abstract |
Static fluid pressure profiles measured in wells are frequently quite different from those occurring naturally in the ground. Normally, true aquifer pressures will be measured only at the levels of greatest permeability. Careful interpretation of downhole pressures, measured in a group of wells penetrating various zones in an Indonesian geothermal field, confirmed that a 400m thick, water-filled formation overlies a vapour-dominated reservoir - although clearly no single well could reflect such a pressure distribution. |