Ranking deepwater subsalt prospects is challenging. Although salt and sediment have large contrasts in properties, translating measurements into useful information is difficult. Services that exploit their differences to answer specific parts of the puzzle reduce the unknowns. Seismic and complementary measurements, combined with 3D full-tensor gravity measurements, help identify salt bodies and associate their structures and boundaries with those of sedimentary targets. Combining these measurements constrains models and helps to speed the well-ranking and placement process.
Gravimetry
Structures conducive to hydrocarbon accumulations can be spotted by combining cost-effective gravity surveys and ocean-bottom profiling, which uses density measurements to highlight salt domes and depositional features such as ancient riverbeds.
Successful E&P in complex geologies and environments requires integration of seismic, electromagnetics, and magnetotellurics data, calibrated with well data. The Integrated Services for Exploration group, spanning Oilfield Services and WesternGeco, provides the expertise needed for both integration and interpretation. Two issues are key in exploration: an evaluation of charge risk and the relative timing of trap formation and hydrocarbon migration. PetroMod petroleum systems modeling software produces a model of basin evolution through geologic time using seismic information, well data, and geologic knowledge. The prediction of hydrocarbon generation, migration, and entrapment reduces the exploration uncertainties.
Petrel seismic-to-simulation software helps increase reservoir performance by improving asset team productivity. Geophysicists, geologists, and reservoir engineers can develop collaborative workflows and integrate operations to streamline processes.
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