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Vertical effective stress and temperature as controls of

Petrographic examination of 247 thin sections from 13 cores from the south-plunging arch and adjacent deep basin is the basis for diagenetic investigation of sandstones ranging in depth from 2 km to almost 5 km.Major diagenetic events were (1) mechanical compaction by grain rearrangement and deformation of ductile grains,(2) formation of Title Forsker ved Institutt for geofag,Location Oslo,Oslo,NorgeFault-controlled carbonate cementation a case study from Mar 02,2021 Mechanical compaction of deeply buried sandstones of the#0183;The subsurface distribution of carbonate cements in sandstones is cornerstone in understanding the fluid regime and origin of cements to shed the lighThe Distribution and Origin of Carbonate Cements in Deep Extremely high porosities and permeabilities are commonly discovered in the sandstones of the Xishanyao Formation in the central Junggar Basin with the burial depth greater than 5500 m,from which hydrocarbons are currently being produced.High content of carbonate cements (up to 20%) is also observed in a similar depth range.Our study aimed to improve our understanding on the origin of

Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextSandstone reservoir quality prediction The state of

such early diagenesis on deep reservoir quality can be substantial deeply buried,well-sorted quartz-ose sandstones in the Norphlet Formation with very continuous early grain coats may have inter-granular porosities of more than 20%; whereas depositionally comparable samples with less con-tinuous coatings have porosities of less than 2%Reservoir quality in the Jurassic sandstone reservoirs Apr 01,2019 Mechanical compaction of deeply buried sandstones of the#0183;The presence of high porosity in deeply buried sandstones is an indication that the processes of dissolution and leaching out have compensated for the effects of compaction and cementation (Nabawy et al.,2009b).5.1.Effect of clay coats on reservoir quality

Reservoir quality controls in deeply buried Rotliegend

Reservoir quality controls in deeply buried Rotliegend sandstones and their outcrop analogs.Tagung such as authigenic mineral precipitation as well as chemical and mechanical compaction have a major impact on the reservoir quality and need to be understood for reservoir quality assessment (Taylor et al.,2010; Busch et al.,2017 Reservoir quality controls in deeply buried Rotliegend Reservoir quality controls in deeply buried Rotliegend sandstones and their outcrop analogs.Tagung such as authigenic mineral precipitation as well as chemical and mechanical compaction have a major impact on the reservoir quality and need to be understood for reservoir quality assessment (Taylor et al.,2010; Busch et al.,2017 Quartz Cementation in Oil Field Sandstones A Review of Despite quartz cement being the most important poreoccluding mineral in deeply buried ( Mechanical compaction of deeply buried sandstones of thegt; 2500 m) sandstones,its origin and the controls on its distribution are still subject to disagreement and debate. Fluid overpressure as a control on sandstone reservoir quality in a mechanical compaction dominated setting Magnolia Field,Gulf of

Preservation of anomalously high porosity in deeply buried

@article{osti_6106967,title = {Preservation of anomalously high porosity in deeply buried sandstones by grain-coating chlorite Examples from the Norwegian Continental Shelf},author = {Ehrenberg,S N},abstractNote = {Five Lower to Middle Jurassic sandstone reservoirs from the Norwegian sector provide examples of deep porosity preservation caused by grain-coating,authigenic chlorite.Preservation of Anomalously High Porosity in Deeply Buried Preservation of Anomalously High Porosity in Deeply Buried Sandstones by Grain-Coating Chlorite Examples from the Norwegian Continental Shelf1 S.N.Ehrenberg.S.N.Ehrenberg but after grain contacts had become adjusted by mechanical compaction.The Norwegian examples demonstrate that a wide range of nearshore marine sand-body types is Overpressure development in sedimentary basins inducedOverpressure development in sedimentary basins induced by chemo-mechanical compaction of sandstones.March 2019; Marine porosity-occluding quartz cement in deeply buried sandstones

Mechanicalcompactionsometimes affects reservoir sandstonesduring deepburialin response to hydrocarbon production (Donaldson et al.,1995,Schutjens et al.,1994).In these cases,mechanicalcompactionoccurs because hydrocarbon production lowers the pore pressure and hence increases the effective stress on the sandstoneframework.Author:Quentin J.Fisher,Martin Casey,M.Ben Clennell,Robert J.KnipeCited by:71Publish Year:1999Mechanical compaction of deeply buried sandstones of the

Was this helpful?Mechanical compaction of deeply buried sandstones of the Mechanical compaction of deeply buried sandstones of the#0183;Extensive distribution of porosity-preserving chlorite coatings in the investigated channels provides a unique natural laboratory to study mechanical compaction in deeply buried sandstones.Mechanical compaction experiments should be conducted on sand with the same textural and mineralogical composition as Uralian-sourced sandstones,in order to improve maximum burialLina Hedvig Line - Forsker - Universitetet i Oslo (UiO Chlorite coatings occupy potential quartz nucleation sites on the framework grain surfaces and likely prevent significant chemical compaction in deeply buried sandstones.Porosity-reduction is believed to follow mechanical compaction trends of similar sandstone compositions.KIT - AGW Conferences - The impact of pore-occluding The impact of pore-occluding cementation and chemical compaction on the reservoir quality of deeply buried sandstones.Name 6th European Geothermal Workshop Our samples mainly consist of sublitharenites,feldspathic litharenites and litharenites after Folk (1980).Besides mechanical compaction,pore-occluding authigenic quartz and chemical

KIT - AGW Conferences - Reservoir quality controls in

Reservoir quality controls in deeply buried Rotliegend sandstones and their outcrop analogs.Name GeoM Mechanical compaction of deeply buried sandstones of the#252;nster 2019 Annual Conference of the Deutsche Geologische Gesellschaft Geologische Vereinigung .Venue M Mechanical compaction of deeply buried sandstones of the#252;nster.Date 22.09.-25.09.2019.Fluid overpressure as a control on sandstone reservoir The reservoir quality (porosity and permeability) of deeply buried hydrocarbon reservoir sandstones in sedimentary basins is significantly affected by burial diagenesis.Many deep reservoirs develop anomalous fluid overpressures during burial.Previous studies on the effect of fluid overpressure on reservoir quality in these deep reservoirs have been inconclusive because of the difficulty in Fluid overpressure as a control on sandstone reservoir The reservoir quality (porosity and permeability) of deeply buried hydrocarbon reservoir sandstones in sedimentary basins is significantly affected by burial diagenesis.Many deep reservoirs develop anomalous fluid overpressures during burial.Previous studies on the effect of fluid overpressure on reservoir quality in these deep reservoirs have been inconclusive because of the difficulty in

Fluid overpressure as a control on sandstone reservoir

The reservoir quality (porosity and permeability) of deeply buried hydrocarbon reservoir sandstones in sedimentary basins is significantly affected by burial diagenesis.Many deep reservoirs develop anomalous fluid overpressures during burial.Differential hydrocarbon enrichment in deep Paleogene Jan 21,2021 Mechanical compaction of deeply buried sandstones of the#0183;The diagenesis that affects the development of the deep Paleogene reservoirs in Wendong areas mainly includes compaction (Figure 8(a)),cementation (Figure 8(b) to (e)) and dissolution (Figure 8(f) and (g)).The compaction effect is most significant when the buried depth of the sandstone reservoir is less than 1500 m,and the porosity of the Diagenetic Heterogeneity of Deep Sandstones and Its The mechanical compaction of lithic sandstones is controlled by the amount and type of lithic fragments [11,37,38].Volcanic rock fragments are the dominant framework component of sandstones in the Toutunhe Formation and are commonly altered. Anomalously high porosity and permeability in deeply buried sandstone reservoirs origin and

Diagenetic Heterogeneity of Deep Sandstones and Its

AbstractIntroductionGeological SettingSamples and MethodsResultsDiscussionConclusionsAcknowledgmentsThe Middle Jurassic Toutunhe Formation at depths of approximately 40006000m has increasingly come into focus as a current deep reservoir target in the central Junggar Basin (NW China).Based on petrography,SEM,stable isotopes,and fluid inclusion analyses,the goals of this study were to investigate the effect of depositional lithofacies on sandstone diagenetic heterogeneity and to examine the relationship between diagenetic evolution and oil charge within a heterogeneous reservoir.Grain siSee more on hindawiPorosity/depth trends in reservoir sandstones assessing Correlated with mineralogical analyses,the reservoir sandstones show a trend towards lower porosity with increasing clay content at shallow burial,probably due to more extensive mechanical compaction.At depths Mechanical compaction of deeply buried sandstones of thegt;3.03.5 km,the porosity loss is highest in sandstones with low clay contents.Diagenesis of sandstone reservoirs of Pattani basin,Gulf Petrographic examination of 247 thin sections from 13 cores from the south-plunging arch and adjacent deep basin is the basis for diagenetic investigation of sandstones ranging in depth from 2 km to almost 5 km.Major diagenetic events were (1) mechanical compaction by grain rearrangement and deformation of ductile grains,(2) formation of Diagenesis and reservoir quality of deeply buriedporosity preserving mechanisms for deeply buried ( Mechanical compaction of deeply buried sandstones of thegt;4 km) sandstones in North-Sea.High porosity ( Mechanical compaction of deeply buried sandstones of thegt;10%) and low porosity ( Mechanical compaction of deeply buried sandstones of thelt;10%) zones have been marked in deeply buried Upper Jurassic sediments.It has been observed that micro-quartz and illite coatings are present in all of the samples.Presence of illite coating around the detrital grains is

Diagenesis and reservoir quality of deeply buried

The reservoir quality of sandstones at any buried depth is controlled by (1) the initial depositional porosity and permeability,(2) the extent of both mechanical and chemical compaction,and (3) type and amount of pore-filling cement (Worden and Morad 2009).Mechanical compaction causes the porosity reduction until chemical compaction starts.AtDiagenesis and Origination of Carbonate Cements inAs deeply buried sand- stones rich in more reactive grains have higher susceptibil- ity to mechanical compaction and more potential cements,dating authigenic mineral is relatively easier to understand the processes and patterns of diagenetic events when com- bining with compacted features.Diagenesis and Origination of Carbonate Cements in Deeply Diagenesis is one of the most predominant factors controlling reservoir quality in the deeply buried siliciclastic sandstones of the third member in the Eocene Shahejie Formation (Es 3),in the Raoyang Sag,the Bohai Bay Basin.In this study,thin section,cathodoluminescence (CL),scanning electron microscope (SEM),X-ray diffraction (XRD),Raman spectrum,carbon and oxygen isotopes,and fluid

Diagenesis and Its Effect on Reservoir Quality of Silurian

26.6%.The Tabei sandstones lost a little more porosity by compaction than by cementation.Quartz cementation,especially syntaxial quartz overgrowth,is a major cause of porosity-loss in many reservoirs in moderately to deeply buried sandstone.Calcite cementation played a key role in the porosity evolution of sandstones.At the early stage ofDEPARTMENT OF THE INTERIOR U.S.GEOLOGICALmechanical compaction,and pressure solution (Houseknecht,1987; 1988).Values of intergranular volume for the deep sandstones of the upper part of the Minnelusa average 42%,with a low of 27%,and a high of 64% (Figure 3).The average value of 42% indicates that,overall,little compaction has occurred in these sandstones as initial (depositional)Coupling of diagenetic alterations and mechanical Initial detrital composition and authigenic alterations during diagenesis of three sandstone types are related to their mechanical properties.Sandstones were prepared for geotechnical standard tests [density,uniaxial compressive strength (UCS),Youngs modulus (E),strain at failure ()] and thin sections for petrographic analyses (point counting).UCS ranges from 3 to 62 MPa and

Compaction microstructures in quartz grains and quartz

Sandstone diagenesis involves porosity loss by mechanical and chemical compaction.In this study we have examined relations of diagenesis and microstructures in quartz grains and quartz cement in sandstones from relatively deep burial depths offshore mid Norway.Electron backscatter diffraction analysis (EBSD) has been combined with optical and cathodoluminescence petrography study ofCompaction in sandstones influence on reservoir quality During progressive burial,terrigenous sandstones compact by (1) packing readjustments without changes in grain shape,(2) ductile deformation of clayey and micaceous grains,chiefly rip-up-clasts,fecal pellets,and fragments of shale,mudstone,slate,and schist,(3) bending of flexible micas,(4) pressure solution,and (5) fracturing of feldspar,quartz,and chert grains.Compaction (consolidation) of sediments SpringerLinkCompaction may be defined as the process by which the sediment volume is reduced and the sediment density increased.Sediments change their physical properties after deposition due to the stress from the overburden (gravitational compaction) and as a result of biological or chemical reactions involving dissolution and precipitation of minerals.

Cited by 7Publish Year 2018Author Lina Hedvig Line,Jens Jahren,Helge Hellevang,Helge HellevangReservoir quality of deeply buried sandstones a

2) Vertical effective stress,although a fundamental factor in mechanical compaction,cannot be used as a predictor of porosity for lithified sandstones.3) Meteoric water may alter the primary mineralogy during shallow burial.Ones sandstones are buried below the reach of meteoric waterCited by 7Publish Year 2018Author Lina Hedvig Line,Jens Jahren,Helge Hellevang,Helge HellevangImages of Mechanical Compaction of deeply buried sandston pubs.geoscienceworldPetroleum reservoir quality prediction overview and researchgate.neta.Photomicrograph showing long intergranular concavo researchgate.net(PDF) Reservoir quality controls in deeply buried britannicarock Definition,Characteristics, Types Britannicalink.springerDiagenetic and geochemical studies of the Buchan Formation www2.lbl.govHow did the oil get into the rock? How can the oil get out? imagesMechanical compaction in chlorite-coated sandstone Chlorite coatings occupy potential quartz nucleation sites on the framework grain surfaces and likely prevent significant chemical compaction in deeply buried sandstones.Porosity-reduction is believed to follow mechanical compaction trends of similar sandstone compositions.Cementation of Simpson and St.Peter Sandstones in Parts A.Revil,D.Grauls,O.Br Mechanical compaction of deeply buried sandstones of the#233;vart Mechanical compaction of sand/clay mixtures,Journal of Geophysical Research Quentin J.Fisher,Martin Casey,M.Ben Clennell,Robert J.Knipe Mechanical compaction of deeply buried sandstones of the North Sea,Marine and Petroleum Geology 16,

AAPG Datapages/Archives Preservation of Anomalously

Volume 77 (1993) Issue 7.(July) First Page 1260 Last Page 1286 Title Preservation of Anomalously High Porosity in Deeply Buried Sandstones by Grain-Coating Chlorite Examples from the Norwegian Continental Shelf Author(s) S.N.Ehrenberg (2) Abstract Five Lower to Middle Jurassic sandstone reservoirs from the Norwegian sector provide examples of deep porosity preservation caused by 12345NextDiagenesis and reservoir quality of deeply buriedOljeselskap) on reservoir quality in deeply buried sandstone reservoirs in the South Viking Graben.Mechanical compaction reduces porosity until the onset of quartz cementation.The degree of mechanical compaction may vary depending on textural characteristics and the composition of(PDF) Reservoir quality controls in deeply buried Reservoir quality controls in deeply buried Rotliegend sandstones and their outcrop analogs. such as authigenic mineral precipitation as well as chemical a nd mechanical compaction have a major .

(PDF) Mechanical Compaction of Porous Sandstone

The mechanical attributes of compaction in nominally dry and saturated samples have been studied under hydrostatic and nonhydrostatic loadings over a broad range of pressure conditions.(PDF) Deeply Buried Sandstones - Diagenesis and Reservoir petrophysical properties of deeply buried Rotliegend sandstones 1) Primary porosity was chiefly decreased by mechanical compaction and precipitation of cements.(PDF) Chapter 2 Mechanical compaction TENG-FONGChapter 2 Mechanical compaction.International Geophysics,2003.Teng-fong Wong.Download PDF.Download Full PDF Package.This paper.A short summary of this paper.37 Full PDFs related to this paper.READ PAPER.Chapter 2 Mechanical compaction.Download.Chapter 2 Mechanical compaction.

Does oil emplacement stop diagenesis and quartz

Reservoir quality relates to the presence of porosity and the connectivity of the pores of the reservoir rock which controls permeability.Deeply buried sandstones in sedimentary basins lose their reservoir quality due to compaction and cementation.Quartz cement is the most volumetrically important porosity occluding cement in sandstones buried to depths greater than about 3000m.

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