The Tangguh gas fields are offshore Irian Jaya in eastern Indonesia. The depth conversion approach described here was used to locate and provide the depth predictions for the last seven certification wells drilled on the Vorwata structure (Figure 1). Two seismic events were picked on the seismic data and were converted to depth—the Top Kais and the Base Cretaceous (Figure 2). The Plio-Pleistocene clastic section overlies the Miocene Kais carbonate. Both carbonates and clastics are present between the Top Kais and the Base Cretaceous. The Base Cretaceous horizon is the top of the Late Jurassic shale,...

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