Seismic pore pressure prediction at the Halten Terrace in the Norwegian Sea
| Autor: | Tim Wynn, Ole G. Tveiten, Eyvind Aker |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Norwegian continental shelf
geography geography.geographical_feature_category 020209 energy Drilling Geology 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Pore water pressure Fuel Technology Geochemistry and Petrology 0202 electrical engineering electronic engineering information engineering Earth and Planetary Sciences (miscellaneous) Economic Geology Vector field Geohazard Cube Petrology 0105 earth and related environmental sciences Water well |
| Zdroj: | Petroleum Geoscience. 26:346-354 |
| ISSN: | 2041-496X 1354-0793 |
| DOI: | 10.1144/petgeo2019-053 |
| Popis: | Pre-drill pore pressure prediction is essential for safe and efficient drilling, and is a key element in the risk-reducing toolbox when designing a well. On the Norwegian Continental Shelf, pore pressure prediction commonly relies on traditional 1D offset well analysis, whereas velocity data from seismic surveys are often not considered. Our work with seismic interval velocities shows that the velocity field can provide an important basis for pressure prediction and enable the construction of regional 3D pressure cubes. This may increase the confidence in the pore pressure models and aid the pre-drill geohazard screening process. We demonstrate how a 3D velocity field can be converted to a 3D pore pressure cube using reported pressures in offset wells as calibration points. The method is applied to a regional dataset at the Halten Terrace in the Norwegian Sea; an area with a complex pattern of pore pressure anomalies which traditionally has been difficult to predict. The algorithm is searching for a velocity to pore pressure transform that best matches the reported pressures. The 3D velocity field is a proxy of rock velocity and is derived from seismic surveys, and is verified to checkshot velocities and sonic data in the offset wells. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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