Searcher Seismic in conjunction with project partner TGS acquired over 12,000 km of 2D long-offset seismic data over the south eastern Papuan Basin.
The survey was acquired in water depths ranging from 30 m to 2,500 m and is still regarded as one of the most comprehensive seismic exploration datasets in the Gulf of Papua.
The original processing greatly improved understanding of the deep compressional fold belt and changed the industry’s prospectivity outlook by showing potential for new pre-Tertiary petroleum systems.
However, the area is plagued with a complex overburden and pushed the limits of traditional PSTM imaging. By applying broadband deghosting and a modern PSDM processing sequence, previous understanding of the basin is being fundamentally changed and there is fresh insight on old plays.
New PSDM data is available now. Gravity and magnetic data was also acquired and processed and available now.
Prior to the acquisition of the Lahara Non-Exclusive 2D Seismic Survey, Searcher Seismic and TGS reprocessed approximately 27,000 km of existing 2D seismic data – both Post-Stack and PSTM. View the Gulf of Papua 2D Reprocessing Package for further information.
2D Digital Solid Streamer
S/V Polar Duke (Fugro)
Gravity and magnetic data acquired and processed
Sample Rate: 2 ms
Record Length: 8 sec
Streamer Length: 7200 m
|Key Processing Parameters||
Anisotropic Kirchhoff PSDM
7 iterations of tomographic velocity model building
Final Full Angle Volume (AGC) (in time and depth)
Final Full Angle Volume (Raw) (in time and depth)
True Amplitude Angle Volumes (Near, Mid, Far, Ultra Far) (in time and depth)
Final PSDM CDP gathers with residual RMO
Final migration interval velocity field
Final anisotropic parameter fields
Gravity and magnetic data
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.