MAPPING UN-EXPLORED RESISTIVE GEO-BODIES USING 3D CSEM TECHNOLOGY: A CASE STUDY OF CSEM GEO-BODY CHARACTERIZATION FROM RAPAK-GANAL AREA IN KUTAI BASIN, MAKASSAR STRAIT, INDONESIA

摘要

The Kutai basin is a prolific hydrocarbon producing basin. One of the challenges in these kind of basins is to quantify the size of the prize before drilling a costly well. A 3D CSEM survey in such scenario can serve dual purpose. Provided that the reservoir is sufficiently thick and sufficiently saturated with hydrocarbon, it will be imaged in inverted CSEM data. This will not only increase 'Chance of Success' (COS) but also allow accurate estimate of areal extent of the resistive geobody and a better handle on size. On various occasions previously it was stated that 'CSEM is only successful in places like Barents sea where the resistivity is high and the contrast between background and target is sufficient enough. In areas such as South-East Asia with low resistive sediments, this technology fails'. Critics have argued there was no solid example where a survey was done over a discovered field and hence could have served as a calibration point.