GEOL472StratigraphicTrapsTypes of Stratigraphic Trap• Depositional– Channels–Bars– Pinch outs– Reefs• Unconformity Traps– Above unconf. •Onlap• Valley Fill• Channels• Diagenetic traps– Permeability barriersStratigraphic TrapsOnlapsFluvial Environments (Rivers)Braided StreamMeandering StreamMeandering StreamSandstoneMudstone3D seismic slice- Fluvial meander at ~2.3 seconds in the West Natuna Basin, Indonesia. ConocoPhillips, Indonesia Monterey CanyonStratigraphic Traps in North Sea Deep water slope Continued regional subsidence Interbedded shale and sandstone Submarine fan and turbidite depositsTertiaryNW SERogaland Group Structure MapJones Play8kmCI = 10msTimeSalt Diapir One exploratory well proposed  Targeting the structural high with faults creating a trap8kmWell 2Rogaland Group Turbidites3D Seismic CoherencyBarrier Island-Lagoon SystemBarrier IslandsShoreline SandsCoral Reef CarbonatesAtol ReefsBiddle and WielchowskyDiagenetic Traps- Permeability BarriersHydrodynamic