Diagenesis of sand stone

Jun 30th, 2015
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Diagenesis is the term used for all the physical and chemical changes taking place in a sediment or sedimentary rock between deposition and either: a) metamorphism, or b) uplift and weathering. Sediment converted into consolidated sedimentary rock. Low temperature near-surface processes to higher temperature subsurface processes

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DiagenesisDiagenesis is the term used for all the physical and chemical changes taking place in a sediment or sedimentary rock between deposition and either: a) metamorphism, or b) uplift and weathering. Sediment converted into consolidated sedimentary rock. Low temperature near-surface processes to higher temperature subsurface processes (<300C and 1-2 kb)The multifarious processes that come under the term diagenesis are chemical, physical, and biological. They include compaction, deformation, dissolution, cementation, authigenesis, replacement, recrystallization, hydration, bacterial action, and development of concretions. The study of diagenesis continues to be an active field of research in sedimentary geology, in part because the variety and complexity of the processes involved has left many uncertainties, but also because of the importance of diagenesis to petroleum geology, in as much as diagenesis is a significant control on porosity and permeability of deeply buried sedimentary rocks, comprising the fine siliciclastic source beds, the coarser reservoir rocks, and the seals that cause those reservoir rocks to be petroleum reservoirs. Diagenesis is an essential aspect, although quite different in processes and effects, of mudrocks, sandstones, and carbonate rocks. Controls on Diagenesis Movement of pore fluids Meteoric/surface waters into sedimentary basinsPotentiometric head defined by ground water table above sea level, pore fluids will rea

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