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→Mapping surfaces
==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 [[Field development|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.
[[file:subsurface-maps_fig1.png|left|thumb|{{figure number|1}}Structure map of the top of the T5 marker, Frlo Formation, Brazoria County, Texas. (After <ref name=pt06r12>Bebout, D. G., Loucks, R. G., Gregory, A. R., 1978, Frio Sandstone reservoirs in the deep subsurface along the Texas Gulf coast—their potential for production of geopressured geothermal energy: The Univ. of Texas Bureau of Economic Geology Report of Investigations, n. 91, 93 p.</ref>.)]]
[[file:subsurface-maps_fig1.png|left|thumb|{{figure number|1}}Structure map of the top of the T5 marker, Frlo Formation, Brazoria County, Texas. (After <ref name=pt06r12>Bebout, D. G., Loucks, R. G., Gregory, A. R., 1978, Frio Sandstone reservoirs in the deep subsurface along the Texas Gulf coast—their potential for production of geopressured geothermal energy: The Univ. of Texas Bureau of Economic Geology Report of Investigations, n. 91, 93 p.</ref>.)]]