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Abstract: The Integration of Geochemical, Geological and Engineering Data to Determine Reservoir Continuity in the Iagifu-Hedinia Field, Papua New Guinea

R. L. Kaufman, L. I. Eisenberg, R. E. Fitzmorris

A series of oil and gas fields, including Iagifu-Hedinia, occur along the leading edge of the Papuan fold and thrust belt. Formed during Pliocene to Recent compression, they are structurally complex, and typically broken into multiple reservoir compartments. The presence of the karstic Darai Limestone at the surface over most of the fold belt prevents acquisition of useful seismic data. Reservoir mapping, and establishment of reservoir continuity, is therefore based solely on 1) surface geologic data, 2) drilling data; initially dipmeter and RFT pressure data, and subsequently well production histories, and 3) geochemical correlation of reservoir fluids. During appraisal of the Iagifu-Hedinia discovery, these complimentary data sets demonstrated that 1) a single hydrocarb n column existed above a flowing aquifer in the main block of Iagifu-Hedinia field, 2) a separate accumulation existed in the Iagifu 3X/8X block, and 3) that two or more separate accumulations existed in the Usano area. Geochemical data have suggested the presence of reservoir compartments where other data were missing or inconclusive. Subsequently-acquired production history data have confirmed the geochemically-based interpretations. Geochemical data suggest that oils at Iagifu-Hedinia have a common source. The slight differences in oil composition between reservoirs are likely due to multiple phases of expulsion from the same source rock and/or migration-fractionation.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France