5 - Diagenesis

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Porosity/Permeability• Characterization of porosity andpermeability may be a an importantpart of thin-section description• How much?• What is origin?• Is porosity connected? (impliespermeability)Burial and PorosityBoggs 2001Primary Porosity• Amount of void spaces within a rock• Primary porosity: a function of grain size, sorting,and packing
Secondary Porosity• Development of pore spaces in rockthrough diagenesis• Deep diagenetic fluids dissolve lessstable framework grains or cement suchas carbonate, plagioclase, pyroxene,amphiboles, and rock fragments• Compression produces fracturesSecondary Sandstone PorosityPorosity & Permeability• Porosity: % of void space in rock/sedimentthat may contain fluids• Total porosity – all pore spaces• Effective porosity – connected pores• Permeability: ability to transmit fluids• Units – Darcies• Absolute/relative permeability a function ofporosity, texture, diagenesis, etc.
Page 1 and 2: DiagenesisChapters 5, 6, 7Diagenesi
Page 3 and 4: Boggs 2001BioturbationCarbonates•
Page 5 and 6: Diagenetic ProcessesMcIlreath and M
Page 7 and 8: Factors influencing the solubility
Page 9 and 10: Chlorite CementBoggs 2001Illite cem
Page 11 and 12: Mineral Replacement• Dissolution
Page 13 and 14: Diagenetic Structures• Liesegange
Page 15: SEM image of quartzovergrowth (Q),c
Page 19 and 20: Secondary porosity - Dakota Fm.Inte
Page 21 and 22: van Krevelen plotSummary• Diagene

5 - Diagenesis

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