ICE 2022


The Peruvian offshore Trujillo Basin is an under-explored frontier region with significant exploration potential. Many Eocene age low-impedance seismic anomalies, associated with apparent flat events, have been identified on 3D seismic volumes and, to a lesser extent, on sparse 2D seismic data. Regionally, exploratory wells have been located on paleo-structural highs and have not targeted the Eocene turbidite facies which are focused in the basin centers. The amplitude anomalies strongly suggest the presence of hydrocarbons and, by extension, provide supporting evidence for the presence of reservoir and seal pairs as well as a working hydrocarbon system. Seafloor piston core data suggest the presence of both Cretaceous and Tertiary-aged oils and thereby contribute additional evidence and further reduce the risk of a discovery. In some prospects the (interpreted) fluid contact crosses both stratigraphy and faults, suggesting that the reservoirs may be relatively high net/gross. The Miocene is not the most prospective sequence in the region – with high play risk for both reservoir and seal. However, in at least one instance, a high-impedance Miocene target exhibits dimming in an updip position and appears to conform to structure. This feature is interpreted to represent a well-imaged Miocene shoal complex. High-impedance reflectors typically represent highly compacted and/or cemented clastic rocks or other lithologies such as salt or limestones; however, if the rocks are porous, and pore spaces are filled with low-density fluids or gas, then the overall density can be reduced to generate a dim spot where hydrocarbons are present. Miocene targets could represent another new play type in the deeper offshore basins along the Peruvian margin. Future plans include the possible acquisition of new 3D seismic data which will add much needed data to develop these concepts across a broader area.