Changes

}}

}}

==Type of water flushes==

==Type of water flushes==

Much diagenesis occurs in open chemical systems whose initial chemistry is set at deposition. After that, the chemistry of the system changes as flowing water moves chemical components through pores and causes either leaching or cementation of grains. Diffusion also moves chemicals in and out of rocks, although at significantly lower rates. During deep burial, chemical systems close and diagenesis is primarily by pressure solution and quartz overgrowths.<ref name=ch09r66>Wilson, M., D., 1994a, Non-compositional controls on diagenetic processes, in Wilson, M., D., ed., [[Reservoir quality]] Assessment and Prediction in Clastic Rocks: SEPM Short Course 30, p. 183–208. Discusses the effect that variables such as temperature and pressure have on diagenesis of sandstones. A good reference for predicting sandstone reservoir system quality.</ref>

Much diagenesis occurs in open chemical systems whose initial chemistry is set at deposition. After that, the chemistry of the system changes as flowing water moves chemical components through pores and causes either leaching or cementation of grains. Diffusion also moves chemicals in and out of rocks, although at significantly lower rates. During deep burial, chemical systems close and diagenesis is primarily by pressure solution and quartz overgrowths.<ref name=ch09r66>Wilson, M., D., 1994a, Non-compositional controls on diagenetic processes, in Wilson, M., D., ed., [[Reservoir quality]] Assessment and Prediction in Clastic Rocks: SEPM Short Course 30, p. 183–208. Discusses the effect that variables such as temperature and pressure have on diagenesis of sandstones. A good reference for predicting sandstone reservoir system quality.</ref>

* '''Thermobaric flow'''—water moves in response to pressure gradients caused by generation of hydrocarbons, release of mineral-bound water, and/or increased heat flow.

* '''Thermobaric flow'''—water moves in response to pressure gradients caused by generation of hydrocarbons, release of mineral-bound water, and/or increased heat flow.

[[:file:predicting-reservoir-system-quality-and-performance_fig9-48.png|Figure 1]] shows the water movement processes mentioned above.

 

[[file:predicting-reservoir-system-quality-and-performance_fig9-48.png|thumb|{{figure number|9-48}}After .<ref name=ch09r19 /> and <ref name=ch09r27>Harrison, W., J., Tempel, R., N., 1993, Diagenetic pathways in sedimentary basins, in Horbury, A., D., Robinson, A., G., eds., Diagenesis and Basin Development: AAPG Studies in Geology 36, p. 69–86.</ref>]]

==Pore-water chemistry==

==Pore-water chemistry==

==Eh-pH graph==

==Eh-pH graph==

[[file:predicting-reservoir-system-quality-and-performance_fig9-49.png|thumb|{{figure number|9-49}}. Copyright: Shelley, 1985; courtesy W.H. Freeman and Co.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-49.png|thumb|{{figure number|2}}. Copyright: Shelley, 1985; courtesy W.H. Freeman and Co.]]

 

==Pore-water chemistry and cements==

==Pore-water chemistry and cements==

==Subsurface dissolved solids==

==Subsurface dissolved solids==

[[file:predicting-reservoir-system-quality-and-performance_fig9-50.png|thumb|{{figure number|9-50}}. Copyright: Shelley 1985; courtesy W.H. Freeman and Co.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-50.png|thumb|{{figure number|3}}. Copyright: Shelley 1985; courtesy W.H. Freeman and Co.]]

 

==See also==

==See also==