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- W1561560652 abstract "Geophysical methods, in conjunction with other tools, can provide the means to predict reservoir pressure in many cases. Over-pressured shales can act as good reservoir seals, but can also cause drilling difficulties, particularly in maintaining an adequate safety margin for the drilling mud weight. Geophysical techniques are based on the impact of reservoir pressure on the seismic velocities (primarily compressional waves). Many studies have demonstrated the effectiveness of geophysical methods for pore pressure prediction. One of the first of such studies was reported by Pennebaker. Subsequently, the Society of Exploration Geophysicists published Geopressure that included major geophysics-related methods for overpressure prediction. With the advent of 3-D seismic and, more recently, four components and 4-D seismic, it has become possible to make pressure predictions that are more reliable and create three-dimensional pressure profiles. In general, the seismic reflections are functions of acoustic impedance (velocity times density), and are influenced by reservoir pressure. On the other hand, the type of reservoir fluid impacts sonic velocities. Shear waves and compressional waves respond differently to various reservoir fluids (and lithology), as well as reservoir pressure. These phenomena offer the following two practical applications: (1) Prediction of abnormal pressure from seismic velocities before drilling; (2) mapping reservoir fluid movement and dynamic changes of reservoir pressure using time lapse (4-D seismic)." @default.
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- W1561560652 date "2002-01-01" @default.
- W1561560652 modified "2023-09-25" @default.
- W1561560652 title "Chapter 7 Seismic methods of pressure prediction" @default.
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- W1561560652 doi "https://doi.org/10.1016/s0376-7361(02)80028-0" @default.
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