TAMING THE THUNDER HORSE WITH AXES AND VECTORS
Paper Ref : SPWLA-2021-0008
Authors : Bernd Ruehlicke, Andras Uhrin, Zbynek Veselovsky, and Markus Schlaich (Eriksfiord)
Speaker : Bernd Ruehlicke
The Thunder Horse Field targets Middle Miocene deepwater turbiditic reservoirs. Despite of being prolific, the mapping of the ~180 m thick, partly amalgamated reservoir sandstones is challenging. Seismic quality is reduced by the presence of salt structures. The salt overburden and high formation pressure requires the use of heavy mud weights and oil-based drilling fluids, which limit the resolution and interpretation potential of borehole image logs (BHI).
Halokinetic movements caused significant postdepositional deformation of the already complex gravitydriven sediment stack and the reservoir beds drape against an E–W oriented salt wall. Consequently, the assessment and removal of the structural dip component is not trivial and the evaluation of paleotransport directions is considerably more complicated compared to undisturbed deepwater reservoirs.
The intention of this paper is to bring the main results from Henry et al. (2018) into context with the eigenvector methodology from Ruehlicke et al. (2019) and to emphasize its value for reservoir characterization.