Changes

Reservoir properties are mapped to promote optimal field development. Subsurface maps dictate well placement and enable engineers to calculate reserves and monitor trends in reservoir performance. Geologists play a key role in subsurface mapping by using interpretations of depositional environments and diagenetic events to project reservoir data away from relatively few well control points (see other chapters). In this sense, subsurface mapping is in great contrast to geological mapping of the earth's surface. Whether using traditional concepts<ref name=pt06r71>Landes, K. L., 1951, Subsurface maps and sections, in Petroleum Geology: New York, John Wiley, 660 p.</ref> or “high technology” computer contouring hardware/software systems<ref name=pt06r60>Jones, T. A., Hamilton, D. E., Johnson, C. R., 1986, Contouring geologic surfaces with the computer: New York, Van Nostrand Reinhold, 320 p.</ref>, mapping interwell areas places a premium on interpretation rather than straightforward plotting of precise data. “Mapping” is here limited to projections in plan view.

Reservoir properties are mapped to promote optimal field development. Subsurface maps dictate well placement and enable engineers to calculate reserves and monitor trends in reservoir performance. Geologists play a key role in subsurface mapping by using interpretations of depositional environments and diagenetic events to project reservoir data away from relatively few well control points (see other chapters). In this sense, subsurface mapping is in great contrast to geological mapping of the earth's surface. Whether using traditional concepts<ref name=pt06r71>Landes, K. L., 1951, Subsurface maps and sections, in Petroleum Geology: New York, John Wiley, 660 p.</ref> or “high technology” computer contouring hardware/software systems<ref name=pt06r60>Jones, T. A., Hamilton, D. E., Johnson, C. R., 1986, Contouring geologic surfaces with the computer: New York, Van Nostrand Reinhold, 320 p.</ref>, mapping interwell areas places a premium on interpretation rather than straightforward plotting of precise data. “Mapping” is here limited to projections in plan view.

==Mapping SurfaceS==

==Mapping surfaces==

A number of surfaces are typically mapped during reservoir development to show closure and other limits to reservoir production. Maps of top of pay and bottom of pay can also be “subtracted” to determine pay thickness.

A number of surfaces are typically mapped during reservoir development to show closure and other limits to reservoir production. Maps of top of pay and bottom of pay can also be “subtracted” to determine pay thickness.