APPLYING SEISMIC ATTRIBUTE ANALYSIS AND INVERSION TECHNIQUES TO UNDERSTAND THE TRAPPING MECHANISM IN THE GAJAH ABU ABU FIELD, WEST NATUNA OFFSHORE

摘要

The Gajah Abu Abu structure, a faulted anticline located in the West Natuna Basin of Southeast Asia was formed by Late Miocene inversion. The anticline is bisected by a major normal fault, which divides the structure into the western, down-thrown and the up-thrown, eastern fault blocks. The Gajah Abu-Abu-1 discovery well was drilled on the up-thrown, eastern fault block by Amoseas Indonesia in 1992.rnPrevious studies assumed that the Gajah Abu Abu trap was controlled by structural elements only. This study, integrating geological/engineering data with the application of the latest geophysical technology, provides new insights into the hydrocarbon-trapping mechanisms of this area and indicates that a significant element of the Gajah Abu Abu trap formation is stratigraphic.rnStudies of seismic attributes, including amplitude extractions, Acoustic Impedance (AI), Elastic Impedance (EI) and delta anomaly (AI - EI) support this analysis. The attribute maps show a similarrnshape of the probable oil distribution area, which isrnindicative of channel system geometry.