Porosity Development Controlled by Deep-Burial Diagenetic Process in Lacustrine Sandstones Deposited in a Back-Arc Basin (Makó Trough, Pannonian Basin, Hungary)

Figure 7

SEM-SE images showing the features of diagenetic clay minerals. (a) Kaolinite occurs together with mixed-layer illite/smectite, well M7, 3421 m, Szolnok Fm. (b) Kaolinite and authigenic microcrystalline quartz, well M7, 3421 m, Szolnok Fm. (c) Pore-bridging illite, well M7, 3421 m, Szolnok Fm. (d) Mixed-layer illite/smectite forms intergrowths with diagenetic quartz, well M7, 3412 m, Szolnok Fm. (e) Pore-filling and grain-rimming chlorite locally forming intergrowths with authigenic quartz, well K1, 3023 m, Algyő Fm. (f) Thick layers of kaolinite/dickite with mixed-layer illite/smectite, well K1, 3012 m, Algyő Fm. Abbreviations: Cal: calcite; Qz au: authigenic quartz; Chl: chlorite.

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