Full text loading...
-
Improved Pore Pressure Prediction from Seismic Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010, Jun 2010, cp-161-00199
- ISBN: 978-90-73781-86-3
Abstract
The objective of this study is to develop improved methods for predicting pore pressure from seismic data. Basin modelling techniques have been combined with Rock Physics velocity modelling to obtain an accurate and robust prediction of pore pressures prior to drilling. The seismic wave velocities depend on porosity, pore pressure and the burial history of the sediments. Knowledge of velocity-depth trends is important when predicting pore pressure from seismic data. Information provided by basin modelling can help establish the appropriate velocity-depth relation. Shales make up over 80% of sediments and rocks in sedimentary basins. Hence, a proper description of velocities in the shaly intervals is therefore important for seismic data interpretation and for accurate estimation of the overburden properties. We have taken a model-based approach in order to make pore pressure predictions away from well-control. Rock Physics based models are used for calculating velocities at a given state of stress, mineralogy and diagenesis. The burial and diagenetic histories are used as input to the velocity model. The pressure predictions from seismic velocities have been coupled with pore pressure predictions from basin modelling. The model has been successfully applied to case studies from the North Sea.