Microscale bioturbation as a first order control on distal prodelta to offshore mudrock reservoirs

Mud-dominated reservoirs exhibit significant heterogeneity driven by depositional processes and post-depositional modification, yet the role of micro-scale bioturbation remains poorly constrained. This study focuses on the impact of diminutive trace fossils ( Multina and Phycosiphon ) within event beds of the Lower Silurian Qusaiba Member (Qalibah Formation, Saudi Arabia) using micro-computed tomography (micro-CT), petrography, and QEMSCAN analyses. In the studied rocks, these diminutive trace f