Fluid escape pipes and blow out structures represent important seal bypass system (SBS) affecting the overburden. Most of those structures have been proven major fluid conduits that may reveal important hints on the fluid migration and fine-tuning our understanding on the main process controlling their genesis can be crucial in elucidating subsea hazard aspects during exploration stage. However, due to the lack of direct geological evidence and clear geophysical imaging, there are still uncertainties concerning they main architecture (root, conduit and seal). In order to contribute to the seismic interpretation of those subsurface structures, we propose a forward seismic modeling aiming at exploring the nature of certain seismic structure responses and architectures observed across the Loyal field (Shetland basin) and using different petrophysics properties. We first build a geological model with essential rock profiles and well logging data constrained. Then, we employ three approaches, i.e., forward modeling, ray-tracing analysis and time-to-depth conversion, to unravel and explore some of the main internal structures observed within the interpreted fluid pipe seal by-pass structures present in the Loyal field. The results allow us to put some constrains on the origin and nature of some specific seismic features observed in the seal bypass structures: (i)Â the absorption effects in the conduit result in the lacking resolution in the internal-pipe and root structures, (ii)Â the upward deflections are almost formed by the real upward dragging intrusive material and (iii)Â the internal pipes are affected by low velocities related to fluid-rich solid material.
Presentation Date: Wednesday, September 18, 2019
Session Start Time: 1:50 PM
Presentation Time: 2:15 PM
Location: Poster Station 4
Presentation Type: Poster
