Searcher, in partnership with PeruPetro, is applying modern broadband reprocessing to ~23,100 km of vintage 2D field data as part of the Huayno Broadband 2D Reprocessing project. The regional 2D reprocessing project has revealed a huge uplift, in particular, the improvement in imaging internal geometry and fault blocks in the shallow section. The dataset provides a much-improved, consistent, regional grid covering the offshore basins of Peru, tying as many wells, leads and prospects as possible.
Offshore Peru Prospectivity
Offshore Peru already has a proven prolific oil play and prospectivity within multiple basins containing both thick reservoir seal pairs and a rich array of structural traps, yet offshore Peru remains dramatically under-explored. Hydrocarbon fields both on and offshore along the north coast in the Tumbes-Progreso and Talara extensional basins currently contribute over 1.8 billion barrels of domestic oil production. To the south of these producing fields lie 5 additional offshore basins where little to no exploration activity has been undertaken to date.
With only 4 exploration wells, the Trujillo and Salaverry Basins have proven source and the Lobos-1 and Morsa North-1 exploration wells encountered significant oil shows during drilling. Hydrocarbon samples recovered from natural slicks on the sea surface demonstrate the existence and veracity of active petroleum systems within these basins. Numerous large undrilled structures in a variety of trap types have been identified on legacy seismic data that has been recently rectified by Searcher.
The Lima and Pisco basins are interpreted as strike slip (pull-apart) basins with significant extensional horst and graben structures present. Geological and geophysical studies carried out on just under 50 samples collected for geochemical analysis indicate that the Carboniferous Ambo Group is likely to be one of the main source rocks within these basins, with Eocene and Oligocene sandstones being proven reservoirs onshore and therefore interpreted to be effective reservoirs offshore as well.
To the south, no exploration wells have been drilled to date in the Mollendo basin. This frontier basin comprises a long narrow forearc basin located mostly on the continental slope. Asphalt layers encountered onshore in Lower and Middle Jurassic formations indicate the presence of potential source rocks which extend offshore. Even with limitations of the available offset information multiple leads have been identified on Searcher’s rectified seismic dataset, suggesting that the Mollendo Basin may yet prove to be the dark horse of Peruvian exploration.
Offshore Peru has proven hydrocarbon systems and strong evidence of significant untapped hydrocarbon potential. The Searcher rectified seismic is a consistent regional dataset that can be leveraged to gain a comprehensive understanding of the basins, geology, plays and ultimately build up a leads inventory within these basins, making the dataset an essential tool for unlocking the massive hydrocarbon potential of offshore Peru.
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|Key Processing Parameters||
Broadband source and receiver deghosting
Shallow water demultiple
Pre-Stack Time Migration
Final PSTM stack
True amplitude PSTM angle stacks (Full, Near, Mid, Far, Ultra-Far)
Final PSTM CDP gathers with residual RMO
PSTM velocity field
Stacking velocity field
What does it mean when Bottom Simulators are Black Swans
Author: Karyna Rodriguez, Neil Hodgson, Julia Davies (Discover Geoscience)
GEO ExPro – June 2021
Determining the geothermal gradient in an undrilled region has direct implications for basin modelling and remains one the largest areas of uncertainty in frontier basin exploration today. Bottom Simulating Reflectors (BSRs) occur at the base of a shallow gas hydrate layer in many of the worlds deep water basins and by calculating the geothermal gradient from the sea floor to base hydrate, quantitative and qualitative inference of the deeper heat flow can assist basin modellers in their work. However, BSRs do not always simulate the seabed and such deviant behaviour can lead them to be interpreted as ‘anything but’ the base of the gas hydrate. Yet such black swans suggest BSRs may be even more useful in mapping variations in heat flow and geotherm than we had previously recognised.