Origin and significance of redistributional secondary porosity

Giles, M. R.; Boer, R. B. de

doi:10.1016/0264-8172(90)90016-a

Cited by 192 publications

(74 citation statements)

References 28 publications

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“…Thus, in these rocks, there is little or no net increase in porosity as a result of the dissolution of the feldspar. Porosity created by feldspar dissolution in these rocks is thus redistributional secondary porosity (after Giles & de Boer, 1990).…”

Section: Diagenetic Sequencementioning

confidence: 99%

Controls on Clay Mineral Distribution and Chemistry in the Early Permian Rotliegend of Germany

Platt

1993

Clay miner.

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Authigenic clay minerals in the German Rotliegend formed mainly at burial depths >1.5 km. Illite is the dominant cement, although kaolinite, dickite and early radial chlorite are abundant locally. Illites contain more AI and late chlorites more AI and Fe in sequences showing extensive grain dissolution. This relationship between clay chemistry and grain dissolution suggests that clay cementation is linked to grain dissolution. Sequences at relatively shallow burial depths (<3-5 km) contain less clay cement. In the more deeply buried sections, increased illite and kandite cementation, together with extensive grain dissolution, is evident where the Rotliegend is juxtaposed against Carboniferous Coal Measures. Faults also acted as important conduits for acidic fluids. Illite and kandite growth occurred at similar depths and from waters of similar isotopic composition (618O = 1-6‰ SMOW) throughout most of the Southern Permian Basin. However, the timing of illite growth varied between areas and corresponded to periods to tectonic activity.

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Section: Diagenetic Sequencementioning

confidence: 99%

Controls on Clay Mineral Distribution and Chemistry in the Early Permian Rotliegend of Germany

Platt

1993

Clay miner.

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“…5G). Kaolinite forms in an acidic en vi ron ment (Osborne et al, 1994) where a sig nif i cant role is played by mete oric wa ters, slightly acidic due to dis so lu tion of CO 2 and organic ac ids (Giles and de Boer, 1990). Dur ing the change from suboxic to anoxic con di tions, berthierine is re placed by py rite in the zone of sul phate re duc tion.…”

Section: Origin Of Berthierinementioning

confidence: 99%

Berthierine in the Middle Jurassic sideritic rocks from southern Poland

Kozłowska¹,

Maliszewska²

2015

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“…Mineral dissolution has been linked to meteoric water penetration (Bj0rlykke 1983), acids generated by inorganic reactions within shales (Bj0rlykke 1983), cooling formation waters (Giles and de Boer 1989) and to the natural thermodynamic instability of feldspars and other high temperature aluminosilicates in the diagenetic realm (Giles and de Boer 1990). These mechanisms are all valid hypotheses and no definite causal link to secondary porosity is established.…”

Section: Introductionmentioning

confidence: 98%

How Important Are Organic Acids in Generating Secondary Porosity in the Subsurface?

Giles

Boer

Marshall

1994

Organic Acids in Geological Processes

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SummaryThe hypothesis that organic acids are responsible for the creation of significant volumes of secondary porosity and the enhancement of aluminium mobility in the subsurface is reviewed against data from reservoir intervals, laboratory experiments and mass-balance considerations. The hypothesis appears to fail on all counts, notably:1. Observational evidence does not support a sudden increase in abundance of secondary porosity over the temperature range at which carboxylic acids are most abundant. 2. Experimental data on the dissolution of feldspars in the presence of organic acids show little evidence to support either enhanced dissolution kinetics or increased Al mobility unless the pH of the experiment was unrealistically low for natural pore fluids. 3. Increased Al mobility due to complexing by organic acids is unlikely in natural pore waters due to the competing effects of other ions for the organic acid ligands. 4. Simple mass-balance considerations show that source rocks would have to be unreasonably abundant to generate enough carboxylic acids to account even for a few percent secondary porosity.

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Origin and significance of redistributional secondary porosity

Cited by 192 publications

References 28 publications

Controls on Clay Mineral Distribution and Chemistry in the Early Permian Rotliegend of Germany

Controls on Clay Mineral Distribution and Chemistry in the Early Permian Rotliegend of Germany

Berthierine in the Middle Jurassic sideritic rocks from southern Poland

How Important Are Organic Acids in Generating Secondary Porosity in the Subsurface?

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