Deep Pore Pressure Prediction in Challenging Areas, Malay Basin, SE Asia

Abstract

Rapid burial and high rates of sedimentation in the Malay Basin has lead to development of overpressure by disequilibrium compaction. Overpressure developed by this process can be quantifi ed using industry-standard techniques that rely on porosity/effective stress relationships. However, where thermally-driven secondary processes create overpressure, porosity-based analysis that uses sonic (or seismically-derived velocity data) and resistivity data as a measure of porosity change underestimate overpressure. These processes will be active in relatively shallowly-buried shales in basins with high geothermal gradient such as the Malay Basin.