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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


23rd Annual Convention Proceedings (Volume 1), 1994
Pages 323-338

The Geometry and Seismic Character of Mid-Late Miocene Carbonate Sequences, SS Area, Offshore Northwest Java

David Carter, Marihot Hutabarat

Abstract

The geometry and distribution of lithofacies are important factors in the geological understanding of subsurface carbonate sequences. High-resolution 3D seismic data commonly provides many geometric and stratigraphic relationships, and is therefore an ideal tool to assess these two factors. A 3D volume from Offshore Northwest Java (ONWJ), illustrates the geometry, Previous HitamplitudeNext Hit and reflection configurations within two Mid-Late Miocene carbonate sequences. One carbonate sequence, informally named Pre-Parigi in ONWJ, is interpreted as a stack of low-relief sheet-like units containing a series of carbonate buildups which form a small elliptical complex. The overstepping of low-angle clinoforms along the complex's eastern margin, combined with back-stepping of the western margin, suggest that the complex has shifted eastward through geological time. An overlying carbonate sequence, the Parigi Formation, is interpreted as a series of well defined, sub-elliptical buildups with several low-relief linear to slightly sinuous buildups extending to the north. In map view, the linear buildups locally have a geometry similar to that of the tail of a comet, with respect to the elliptical buildups. The linear buildups probably represent the deposition of material in a relatively low-energy setting, leeward of the main elliptical buildups. Seismic facies are mapped within the Pre-Parigi carbonate sequence using a new technique which involves the automated zone-averaging of seismic attributes. Both zone-averaged Previous HitRMSNext Hit Previous HitamplitudeTop and frequency attributes provide images that represent the carbonate sequence as a whole. These results have implications for further use of the zone-averaging technique as a general exploration tool where lateral facies changes are associated with changes in reservoir quality.


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