Changes

[[file:petroleum-systems_fig3-21.png|300px|thumb|{{figure number|1}}Cross section from the Papers Wash field from the San Juan Basin, New Mexico. From Vincelette and Chittum.<ref name=Vincelette&Chittum>Vincelette, R. R., and W. E. Chittum, 1981, [http://archives.datapages.com/data/bulletns/1980-81/data/pg/0065/0012/2500/2546.htm Exploration for Oil Accumulations in Entrada Sandstone, San Juan Basin, New Mexico]: AAPG Bulletin, vol. 65, p. 2546-2570.</ref>]]

[[file:petroleum-systems_fig3-21.png|300px|thumb|{{figure number|1}}Cross section from the Papers Wash field from the San Juan Basin, New Mexico. From Vincelette and Chittum.<ref name=Vincelette&Chittum>Vincelette, R. R., and W. E. Chittum, 1981, [http://archives.datapages.com/data/bulletns/1980-81/data/pg/0065/0012/2500/2546.htm Exploration for Oil Accumulations in Entrada Sandstone, San Juan Basin, New Mexico]: AAPG Bulletin, vol. 65, p. 2546-2570.</ref>]]

[[file:petroleum-systems_fig3-22.png|thumb|{{figure number|2}}(A) If mature source rock was located directly under the reservoir, then all traps would be filled an equal amount. (B) If the source was mature downdip to the north, then drill the deepest prospect, not the middle or shallowest prospect to the south. &copy; Barker.<ref name=Barker1992>Barker, C., 1992, The role of source rock studies in petroleum exploration, in K. S. Johnson and B. J. Cardott, eds., Source Rocks in the Southern MidContinent, 1990 Symposium: Oklahoma Geological Survey Circular 93, p. 3-20</ref> Courtesy Oklahoma Geological Society.]]

[[file:petroleum-systems_fig3-22.png|thumb|300px|{{figure number|2}}(A) If mature source rock was located directly under the reservoir, then all traps would be filled an equal amount. (B) If the source was mature downdip to the north, then drill the deepest prospect, not the middle or shallowest prospect to the south. &copy; Barker.<ref name=Barker1992>Barker, C., 1992, The role of source rock studies in petroleum exploration, in K. S. Johnson and B. J. Cardott, eds., Source Rocks in the Southern MidContinent, 1990 Symposium: Oklahoma Geological Survey Circular 93, p. 3-20</ref> Courtesy Oklahoma Geological Society.]]

Consider [[:file:petroleum-systems_fig3-21.png|Figure 1]], a cross section from the Papers Wash field from the San Juan Basin, New Mexico. The cross section shows that three separate prospects (traps) were tested (drilled). The deepest trap was filled to the spill point with oil, the middle trap was partially filled, and the shallowest trap was empty. This arrangement suggests that oil migrated to the traps from a mature source rock downdip to the north by filling the traps in sequence.

Consider [[:file:petroleum-systems_fig3-21.png|Figure 1]], a cross section from the Papers Wash field from the San Juan Basin, New Mexico. The cross section shows that three separate prospects (traps) were tested (drilled). The deepest trap was filled to the spill point with oil, the middle trap was partially filled, and the shallowest trap was empty. This arrangement suggests that oil migrated to the traps from a mature source rock downdip to the north by filling the traps in sequence.