Time-lapse (4D) seismic is a modern technology for monitoring production-induced changes in and around hydrocarbon reservoirs. Perhaps the most important challenges related to this technology are to perform quantitative time-lapse and to interpret time-lapse effects in thin layers. This book presents an integrated study of saturation and pressure effects on elastic properties. A workflow is developed to test the validity of Gassmann fluid substitution in real geological environments and it is applied on a turbidite reservoir from the Campos Basin, offshore Brazil. The magnitude of pressure...