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→Unconformities and subcrops
===Unconformities and subcrops===
===Unconformities and subcrops===
[[Mapping unconformities|Surfaces of unconformity]] can be especially useful marker horizons for structure contour mapping ([[:file:subsurface-maps_fig2.png|Figure 2]]). In many fields, unconformities are the location of sealing shales and/or source rocks above reservoir pay. Subcrop maps, traces of productive zones, barriers, or [[Markers|marker horizons]] mapped on the unconformity surface are invaluable for planning well placement and for [[Field development|reservoir development]].
[[Mapping unconformities|Surfaces of unconformity]] can be especially useful [[Markers|marker horizons]] for structure contour mapping ([[:file:subsurface-maps_fig2.png|Figure 2]]). In many fields, unconformities are the location of sealing shales and/or source rocks above reservoir pay. Subcrop maps, traces of productive zones, barriers, or [[Markers|marker horizons]] mapped on the unconformity surface are invaluable for planning well placement and for [[Field development|reservoir development]].
===Pressure===
===Pressure===