Patent ID: 7542853

Claim:
A method of performing geobaric analysis of a subterranean formation, the method comprising: (a) acquiring a weighting value and at least three of a formation pressure, an excavation pressure, an in situ gas volume, and an excavated gas volume wherein at least one of the at least three is acquired from a characteristic associated with a drilling fluid returned from said subterranean formation by means of a sensing system; and (b) utilizing the relationship P Formation = P Excavation - ( a 1 - ( V InSitu - V Excavated V InSitu ) ) , to determine the one of formation pressure, excavation pressure, in situ gas volume, and excavated gas volume not acquired in (a), where P Formation is said formation pressure, P Excavation is said excavation pressure, a is said weighting value, V InSitu is said in situ gas volume, and V Excavated is said excavated gas volume.