Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin

Neagu, R. C.; Cartwright, Joseph Albert; Davies, Richard J.; Jensen, L. N.

doi:10.1016/j.marpetgeo.2010.09.003

Cited by 19 publications

(56 citation statements)

References 51 publications

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“…Some of these diagenetic reactions change substantially the acoustic properties of rocks, and therefore produce prominent reflections on seismic data. On this aspect, particularly well documented are the Opal A/CT and CT/Quartz diagenetic transition (Berndt et al, 2004;Davies and Cartwright, 2002;Meadows and Davies, 2007;Neagu et al, 2010), the smectite/illite and kaolinite/illite transformation (e.g. Hower et al, 1976;Bjorlykke, 1998), and in evaporitic basins, the gypsum/anhydrite and carnallite/sylvite transition (Jowett, 1993).…”

Section: 15-diagenetic Reactions and Polygonal Faultingmentioning

confidence: 99%

Messinian evaporites and fluid flow

Bertoni

Cartwright

2015

Marine and Petroleum Geology

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Section: 15-diagenetic Reactions and Polygonal Faultingmentioning

confidence: 99%

Messinian evaporites and fluid flow

Bertoni

Cartwright

2015

Marine and Petroleum Geology

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“…Davies, ) and the MB : Møre Basin (e.g. Neagu et al ., ), (b) Basemap showing the surface well locations and 3‐D seismic surveys used in this study, (c) Geoseismic section illustrating the major faults and stratigraphic units and (d) Simplified stratigraphic column for the North Viking Graben. Location of the basemap (b) and geoseismic section (c) is illustrated in (a).…”

Section: Geological Settingmentioning

confidence: 99%

“…These changes typically cause the embrittlement of fine‐grained sedimentary rocks and can thereby influence the hydraulic fracturing potential of unconventional reservoirs (see review by Passey et al ., ). These diagenetic changes in bulk density and p‐wave velocity often produce distinct seismic reflections that can be observed and mapped over several hundreds to thousands of kilometres (Hein et al ., ; Davies & Cartwright, ; Lee et al ., ; Volpi et al ., ; Meadows & Davies, ; Neagu et al ., ; Ireland et al ., ). Mapping these reflections using 3‐D seismic data revealed that silica diagenesis can influence fluid flow, overpressure and compaction and may trigger submarine slope failures, sediment remobilisations and injections (Davies, ; Davies & Clark, ; Davies et al ., , ; Cartwright, , ; Neagu et al ., ; Davies & Ireland, ).…”

Section: Introductionmentioning

confidence: 99%

Silica diagenesis in Cenozoic mudstones of the North Viking Graben: physical properties and basin modelling

et al. 2015

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Silica diagenesis can significantly change physical properties of the host strata and release large volumes of water. Predicting these changes and their timing is essential to understanding compaction, fluid flow and rock deformation in sedimentary basins. In this paper, the influence of silica diagenesis (opal-A/CT transformation) on physical properties is determined, the sediment volume affected by these changes is mapped, and a new technique to model silica diagenesis is introduced. A petrophysical analysis of 16 exploration wells shows that the opal-A/CT transformation leads to a porosity reduction of c.20% (from 49 to 29%) in Cenozoic mudstones of the North Viking Graben. Using three-dimensional seismic reflection data, it is shown that the c.50 m thick opal-A/CT transformation zone covers an area of >1500 km2, equating to a minimum volume of 75 km3. The spatial and temporal evolution of opal-A/CT transformation is simulated using an innovative basin modelling approach, the results of which indicate that the transformation started around Middle-to-Late Eocene times and then migrated upwards until it gradually fossilised between the Miocene and present. These findings are important, as they help understanding how these sediments compact and when fluids are released by diagenesis

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“…Current research on silica diagenesis can be divided into two fields: (1) the study of opal‐CT and quartz precipitation at micrometer scale using mineralogical analysis techniques [e.g., Peltonen et al ., ; Kazerouni et al ., ; Thyberg et al ., ; Weibel et al ., ; Thyberg and Jahren , ; Worden et al ., ; Kalani et al ., ] and (2) the study of the kilometer‐scale structures of the opal‐A/CT transformation using seismic reflection data [e.g., Davies and Cartwright , ; Davies , ; Meadows and Davies , ; Davies et al ., ; Neagu et al ., ; Ireland et al ., ]. At the micrometer scale, analytical techniques, such as scanning electron microscopy and X‐ray diffraction, have allowed the recognition of a variety of quartz precipitates (e.g., chains, rings, and sheets) that may impact host rock properties [ Peltonen et al ., ; Kazerouni et al ., ; Thyberg et al ., ; Weibel et al ., ; Thyberg and Jahren , ; Worden et al ., ; Kalani et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Wrona

Taylor

Jackson

et al. 2017

Geochem Geophys Geosyst

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Silica diagenesis has the potential to drastically change the physical and fluid flow properties of its host strata and therefore plays a key role in the development of sedimentary basins. The specific processes involved in silica diagenesis are, however, still poorly explained by existing models. This knowledge gap is addressed by investigating the effect of silica diagenesis on the porosity of Cenozoic mudstones of the North Viking Graben, northern North Sea through a multiple linear regression analysis. First, we identify and quantify the mineralogy of these rocks by scanning electron microscopy and X‐ray diffraction, respectively. Mineral contents and host rock porosity data inferred from wireline data of two exploration wells are then analyzed by multiple linear regressions. This robust statistical analysis reveals that biogenic opal‐A is a significant control and authigenic opal‐CT is a minor influence on the porosity of these rocks. These results suggest that the initial porosity of siliceous mudstones increases with biogenic opal‐A production during deposition and that the porosity reduction during opal‐A/CT transformation results from opal‐A dissolution. These findings advance our understanding of compaction, dewatering, and lithification of siliceous sediments and rocks. Moreover, this study provides a recipe for the derivation of the key controls (e.g., composition) on a rock property (e.g., porosity) that can be applied to a variety of problems in rock physics.

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Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin

Cited by 19 publications

References 51 publications

Messinian evaporites and fluid flow

Messinian evaporites and fluid flow

Silica diagenesis in Cenozoic mudstones of the North Viking Graben: physical properties and basin modelling

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

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