Evolution of sediment permeability during burial and subduction

摘要: We assembled a data set of permeability measurements from 317 subduction zone and reference site samples worldwide made over nearly 25 years scientific drilling. This allowed us to examine the influence grain size, structural domain, measurement type on permeabilities ranging 10−21 10−14 m2. found that porosity–permeability behavior is function clay-size fraction, which consistent with previous work. Sediments within slope, accretionary prism, fault-zone domains are strongly affected by shearing, alters burial. Consolidation, flow-through, transient pulse decay all provide comparable results. Measurements horizontal vertical show significant cm-scale anisotropy (ratio >10) in slope prism domains, further indicating shear deformation these domains. Laboratory consolidation trends match large-scale (102 m) field negligible shear, but tend underestimate rate reduction porosity loss where significant. Comparison downhole shows controlled higher-permeability (>10−15 m2) layers at meter tens meters scale, while wireline formation tester closely laboratory underthrust exhibit similar trends, suggests shallow (total burial <1 km) does not significantly alter incoming sediments. deeper analog 14 passive-margin maintained through diagenesis porosities <10%, suggesting observed informative for predicting depth following subduction.