Relate to any object located below the Earth's surface or Earth's sea level.
In Petroleum Upstream it usually refers to wellbore and geological formations.
See also
Natural Science / Physics / Measuring / Positioning
[ Surface ]
Relate to any object located below the Earth's surface or Earth's sea level.
In Petroleum Upstream it usually refers to wellbore and geological formations.
Natural Science / Physics / Measuring / Positioning
[ Surface ]