Facies Controls on Sandstone Diagenesis

Füchtbauer, Hans

doi:10.1007/978-94-009-7259-9_5

Cited by 18 publications

(21 citation statements)

References 21 publications

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“…Pressure solution is a possible mechanism for the generation of silica cement from the interbedded mudstones [12,13]. Pressure dissolution of silica is minor in the upper 1500 m of the sediments, but increases in a roughly linear manner with depth [14].…”

Section: Discussion and Interpretationmentioning

confidence: 99%

“…Diffusion is considered to be the most important means of short distance migration of ions using the concentration gradient [e.g. 21,9,12]. Calculations show that diffusion alone accounts for most of mass transfer, and silica transport by diffusion is possible over 3-5 meters [e.g.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

“…In an arid environment, early carbonate cements contain iron and manganese oxides [21]. Calcite, ankerite and anhydrite cementation can represent either early stage or late stage precipitation [12]. Ferroan calcite and ferroan dolomite can precipitate in either early stage or late stage diagenesis depending upon the super saturation of the pore water with respect to iron ions.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

“…Some workers [e.g. 12,27,11] have stressed that the amount of pore fluids released from muddy and clayey sediments determine how, when, and to what degree sandstone diagenesis occurs. Mineralized pore waters are liberated during compaction from both the overlying and underlying mudstones [e.g.…”

Section: Means Of Pore Water and Mass Transfer (A) Mechanical Compactmentioning

confidence: 99%

“…A number of studies suggest that the dissolution of unstable grains by meteoric water as one of the sources for silica cement [e.g. 6,12,20]. Quartoze sandstones in intracratonic basins will retain considerable permeability after burial permitting long-term cementation by quartz [6,31].…”

Section: Means Of Pore Water and Mass Transfer (A) Mechanical Compactmentioning

confidence: 99%

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Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Ahmed

2002

Bull. Chem. Soc. Eth.

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ABSTRACT. Beds of siltstone, mudstone and shale are interbedded in the Permo-Triassic sandstones of the Ulster Basin, UK, at different stratigraphic levels. The paragenetic sequences of authigenic minerals both in the sandy and fine-grained sediments (mudstones and siltstones) indicate red bed diagenetic trend. Abundant authigenic quartz overgrowths and carbonate crystals observed near the sandstone-siltstone and sandstone-mudstone contacts, indicating that pore water and mass transfer from the fine-grained sediments to sandstone facies. The fine-grained sediments are the main source of ions for the authigenesis of quartz and feldspar overgrowths and carbonate precipitation. Mechanical compaction of fine-grained sediments, influx of gravity-driven acidic meteoric pore water, dehydration water, diffusion and convection are the most important means of mass transfer and pore water circulation. Pore water migration depends upon permeability distribution and pressure difference.

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Section: Discussion and Interpretationmentioning

confidence: 99%

Section: Discussion and Interpretationmentioning

confidence: 99%

Section: Discussion and Interpretationmentioning

confidence: 99%

Section: Means Of Pore Water and Mass Transfer (A) Mechanical Compactmentioning

confidence: 99%

Section: Means Of Pore Water and Mass Transfer (A) Mechanical Compactmentioning

confidence: 99%

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Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Ahmed

2002

Bull. Chem. Soc. Eth.

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A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

Wang

Zhang

et al. 2018

J Petrol Explor Prod Technol

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The sandstone from the Oligocene Xiaganchaigou Formation (E 3) in the Lengdong area, Qaidam Basin, China, is extensively distributed and acts as an effective regional reservoir for hydrocarbon accumulation. Based on thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD) image analysis and cathodoluminescence (CL), a comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of the Oligocene sandstone reservoirs of the Xiaganchaigou (E 3) Formation in the Lengdong area, Qaidam Basin, are studied. The sandstones in the Lengdong area are classified as argillaceous sandstone, silty sandstone, fine sandstone, medium sandstone, pebbly sandstone, conglomeratic sandstone and conglomerate based on their grain sizes, degrees of sorting, and matrix contents. Five sedimentary facies were identified in the Xiaganchaigou Formation (E 3) of the Lengdong area, Qaidam Basin: distributary channel, interdistributary bay, mouth bar, central bar and distal sand sheet facies. Their major diagenetic processes include compaction, carbonate cementation and feldspar and calcite cement dissolution. The porosity and permeability values of the fine sandstone, conglomerate, and conglomeratic sandstone are the highest, followed by those of the medium sandstone and silty sandstone, and the argillaceous sandstone and pebbly sandstone have the lowest porosity and permeability values. The diagenetic sequence in the study area ranges from the eodiagenesis B stage to the mesodiagenetic A stage. Compaction has significantly reduced the primary porosity. Carbonate cements, mainly calcite cements, occlude pores by precipitating in intergranular and intragranular spaces. Dissolution largely contributes to increasing the secondary porosity. The well-sorted and relatively coarser-grained sandstones that formed in higher-energy sedimentary facies (distributary channel, mouth bar and central bar) have a better reservoir quality than the poorly sorted, clay-rich sandstones that formed in low-energy environments (interdistributary bay and distal sand sheet). Based on the comprehensive analysis of petrographic data, diagenesis and sedimentary facies, the reservoir in the Lengdong area is classified into three types: type A, type B and type C. Type A, located in the center of the study area, is the most favorable reservoir, while type C sandstone is the last to consider when looking for a good reservoir. This study can guide hydrocarbon exploration in the Lengdong area, as well as in northwestern China and similar areas throughout the world.

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Petrography and diagenesis of Neoproterozoic Bhander Sandstones, Vindhyan Supergroup, Southeastern Rajasthan, India: Implications for provenance and reservoir characteristics

Ayaz

Hasan

Kadri

2023

J. Sediment. Environ.

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The Neoproterozoic Bhander Group, the youngest and most widely distributed group of Upper Vindhyans, consists of about 1000m thick succession of sandstone, shale, and limestone. Petrographic investigations reveal that the Bhander Sandstones are mineralogically mature and classi ed as quartzarenite and sublitharenite type which is composed of varieties of quartz with ultra-scarcity of feldspar, lithic fragments, micas, and heavy minerals. Average framework composition of the Lower Bhander Sandstone is Qt 98.68 F 0.10 L 1.22 and Upper Bhander Sandstone is Qt 95.92 F 0.12 L 3.96 .Quartz is a more abundant mineral, as shown by X-ray Diffraction Analysis. Petrofacies reveal that the Bhander Sandstones were derived mainly from the source rocks of a craton interior setting with a minor quartzose recycled sedimentary source material. A scarcity of feldspar and rock fragments suggests intense chemical weathering in a warm and humid paleoclimate. Mechanical compaction, cements, authigenic clays, and dissolution and modi cation of unstable clastic grains are the major diagenetic components identi ed based on the framework grain-cement relationships. Kaolinite and silica (quartz) overgrowth are found as pore-lling and lining cements. Compaction was more effective than cementation in affecting primary porosity. Cementation decreased porosity and permeability drastically. Kaolinite lls pore spaces, reducing the sandstone's porosity and permeability. Secondary porosity developed as a result of partial to complete feldspar dissolution. The diagenetic signatures observed in the Bhander Sandstones are suggestive of deep burial. The reservoir quality of the studied sandstones is degraded by authigenic clay minerals and cementations, but enhanced by alteration and dissolution of unstable grains.

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Facies Controls on Sandstone Diagenesis

Cited by 18 publications

References 21 publications

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

Petrography and diagenesis of Neoproterozoic Bhander Sandstones, Vindhyan Supergroup, Southeastern Rajasthan, India: Implications for provenance and reservoir characteristics

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