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→Unconformities and subcrops: no smw in fig
Surfaces of unconformity can be especially useful marker horizons for structure contour mapping (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 marker horizons mapped on the unconformity surface are invaluable for planning well placement and for reservoir development.
Surfaces of unconformity can be especially useful marker horizons for structure contour mapping (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 marker horizons mapped on the unconformity surface are invaluable for planning well placement and for reservoir development.
[[file:subsurface-maps_fig2.png|thumb|{{figure number|2}}Structure of the base of the Humber unconformity (top of the Brent Group), Dunlin field, U.K. Northern North Sea mapped with 1979 and 1989 vintage data. Contours are marked in ft subsea × 100; contour interval is [[length::100 ft]]. (From <ref name=pt06r16>Braithwaite, C. I. M., Marshall, J. D., Holland, T. C., 1989, Improving recovery from the Dunlin field, U., K. Northern North Sea, in Formation Evaluation and Reservoir Geology: 64th Annual Technical Conference of the Society of Petroleum Engineers, San Antonio, TX, Oct. 8–11, SPE 19878, 18 p.</ref>.)]]
[[file:subsurface-maps_fig2.png|thumb|{{figure number|2}}Structure of the base of the Humber unconformity (top of the Brent Group), Dunlin field, U.K. Northern North Sea mapped with 1979 and 1989 vintage data. Contours are marked in ft subsea × 100; contour interval is 100 ft. (From <ref name=pt06r16>Braithwaite, C. I. M., Marshall, J. D., Holland, T. C., 1989, Improving recovery from the Dunlin field, U., K. Northern North Sea, in Formation Evaluation and Reservoir Geology: 64th Annual Technical Conference of the Society of Petroleum Engineers, San Antonio, TX, Oct. 8–11, SPE 19878, 18 p.</ref>.)]]
===Pressure===
===Pressure===