Changes

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Fourth- or fifth-order moderate sea level cycles (20–50 m) occurred when global climate was transitional between major continental glaciation (commonly but not necessarily icehouse times) and greenhouse times.<ref name=ch09r49>Read, J., F., 1995, Overview of carbonate platform sequences, cycle stratigraphy and reservoirs in greenhouse and ice-house worlds, in Read, J., F., Kerans, C., Webber, L., J., Sarg, J., F., Wright, F., M., eds., Milankovitch Sea-level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-house Worlds: SEPM Short Course 35, 183 p. Good summary of concepts of climatic effect on sea level cycles, carbonate deposition, and reservoir development.</ref> Arid and humid zones existed simultaneously at different parts of the globe during transitional periods.

Fourth- or fifth-order moderate sea level cycles (20–50 m) occurred when global climate was transitional between major continental glaciation (commonly but not necessarily icehouse times) and greenhouse times.<ref name=ch09r49>Read, J. F., 1995, Overview of carbonate platform sequences, cycle stratigraphy and reservoirs in greenhouse and ice-house worlds, in Read, J. F., Kerans, C., Webber, L. J., Sarg, J. F., Wright, F. M., eds., Milankovitch Sea-level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-house Worlds: SEPM Short Course 35, 183 p. Good summary of concepts of climatic effect on sea level cycles, carbonate deposition, and reservoir development.</ref> Arid and humid zones existed simultaneously at different parts of the globe during transitional periods.

==General characteristics==

==General characteristics==

==Arid vs. humid zone sequences==

==Arid vs. humid zone sequences==

[[file:predicting-reservoir-system-quality-and-performance_fig9-82.png|300px|thumb|{{figure number|1}}Modified. Copyright: Read, 1995; courtesy SEPM.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-82.png|300px|thumb|{{figure number|1}}Comparison of moderate-amplitude carbonate sequences from arid zones with carbonate sequences from humid zones. Modified from Read;<ref name=ch09r49 /> courtesy SEPM.]]

The diagram in [[:file:predicting-reservoir-system-quality-and-performance_fig9-82.png|Figure 1]] compares moderate-amplitude carbonate sequences from arid zones with carbonate sequences from humid zones. Arid zone grainstones tend to be oolitic, while humid zone grainstones tend to be skeletal. Humid zone sequences show the effects of repeated sea level changes by their distinctive cement zones precipitated in thick meteoric water lenses.

The diagram in [[:file:predicting-reservoir-system-quality-and-performance_fig9-82.png|Figure 1]] compares moderate-amplitude carbonate sequences from arid zones with carbonate sequences from humid zones. Arid zone grainstones tend to be oolitic, while humid zone grainstones tend to be skeletal. Humid zone sequences show the effects of repeated sea level changes by their distinctive cement zones precipitated in thick meteoric water lenses.