Publications

The basic theories to predict abnormal pressure zone introduced by Hottman & Johnson (1965) and Bellotti & Giacca (1978) have been applied inPERTAMINAUnit EP I11 area. The study started from making a theoretical mud weight curve derived from seismic stacking velocities. This curve is then compared to the actual mud weight, which is believed to overcome the formation pressure, at the corresponding well.The study which was made from 36 wells (33 wells are located in West Java and 3 in East Java) has led to the conclusion that 61% of the predictions relatively meet the needs, however, after some corrections were made, this figure rose to 83%. The remaining less suitable figures obtained might be caused by some factors which are, among others, the poor quality of the seismic data, the poor analysis of the shale velocity, the incorrect positioning of the ",normal trend",, etc.The aim of this study was to aid in casing and mud weight designing for PERTAMINA exploration wells.