抄録
Peciko gas field is located in offshore area, southern part of Mahakam delta system, East Kalimantan, Indonesia. Mahakam delta has been developed in the region since the Oligocene to recent, and it had been proved as petroliferous area by the discovery of giant oil and gas fields. In the early delineation stage of Peciko gas field, northward deviation of the gas zones was recognized by the drilling results, and stratigraphic trap of sand pinch out was considered as the trapping mechanism to explain this phenomenon. But the accumulation of the formation pressure data and knowledge from the sequence stratigraphic study suggest that the distribution of Peciko gas zones are not controlled by the distribution of the sandstone layers, but by a hydrodynamic trapping mechanism. This trapping mechanism is generated by the expulsion of compaction water in prodelta muddy facies in the east and south of Peciko gas field. The recognition of hydrodynamic trapping mechanism in the early stage of delineation was significantly helped the field appraisal. Discovery of Peciko gas field by new play type of hydrocarbon accumulation highly graded up the potentiality of Mahakam delta, and the hydrodynamic trapping mechanism can be applied in other fields.
