Diagenesis and reservoir quality evolution of palaeocene deep-water, marine sandstones, the Shetland-Faroes Basin, British continental shelf

Mansurbeg, Howri; Morad, S.; Salem, Alaa; Marfil, R.; El‐Ghali, Mohamed A.K.; Nystuen, Johan Petter; Caja, M.A.; Amorosi, Alessandro; García, Daniel; Iglesia, Á. La

doi:10.1016/j.marpetgeo.2007.07.012

Cited by 176 publications

(81 citation statements)

References 71 publications

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“…Various cements (carbonates, clay minerals and quartz) as well as compaction have collectively controlled the reservoir quality evolution of the sandstones (Lima & DeRos, 2002;Mansurbeg et al, 2008). Compaction and cementation have played an important part in reducing original porosities to their present values (Higgs et al, 2007;Ehrenberg et al, 2008;Taylor et al, 2010).…”

Section: Compaction and Sandstone Porositymentioning

confidence: 99%

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

et al. 2015

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Deeply buried Lower Cretaceous Bashijiqike sandstones are important gas exploration targets in the Kelasu thrust belt, Kuqa Depression of Tarim Basin in China. The sandstones are characterized by low porosity, low permeability and strong microscopic heterogeneity due to diagenesis during their geologic history. Mineralogical, petrographic, and geochemical analyses combined with high-pressure mercury injection analysis have been used to investigate the diagenesis, diagenetic minerals, and their impact on reservoir quality. This article addresses the controls exerted by depositional parameters and diagenetic modifications on pore-network characteristics (porosity, pore types, sizes, shapes, and distribution), with the aim to unravel the formation mechanisms of this complex pore structures, and to improve the characterization and classification evaluation for the Bashijiqike sandstone reservoirs. The Bashijiqike sandstones are dominated by lithic arkoses and feldspathic litharenite. The pore system consists of intergranular macropores, intergranular micropores, and intragranular pores. Framework grains are generally heavily compacted. Authigenic quartz, authigenic feldspar, clay minerals and carbonates are the major pore-filling constituents. The pore structure is characterized by small pore radius and poor interconnectivity. Entry pressure reflects the microscopic pore network and macroscopic reservoir property characteristics. Pore structure characteristics are linked to the depositional parameters, type and degree of diagenesis. Clays do not control reservoir pore networks alone, and pores and pore throats are wider in coarser grained sandstones. Entry pressure decreases with the content of the rigid quartz. Compaction and cementation continue to decrease the pore-throat size, while dissolution enlarges pores and pore-throats radius. Considerable amounts of microporosity associated with clay minerals and altered grains contribute to the high entry pressure. Comprehensive Coefficient of Diagenesis (CCD), which considers the integrative effect of diagenesis, shows strong statistical correlations with entry pressure. CCD is an integrative modulus of diagenesis and physical property, and generally the higher the values are, the better the pore structure. It is suitable for quantitatively characterizing pore structure in tight gas sandstones. The results of this work can help assess pore-network characteristics like the Bashijiqike sandstones which had experienced strong diagenetic modifications during their geological history.

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Section: Compaction and Sandstone Porositymentioning

confidence: 99%

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

et al. 2015

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“…How ever, intragranular po ros ity ex ists mostly as a re sult of par tial or com plete dis so lu tion of feld spar and vol ca nic rock frag ments ( Fig. 6A, A1; Mansurbeg et al, 2008) and var ies in size be tween 45 and 199 mm. Mouldic pores are ob served in both coarse-and fine-grained sand stone but are more com mon in coarse-grained beds.…”

Section: Ta Blementioning

confidence: 99%

“…Grain re arrange ment is also an im por tant po ros ity re duc tion fac tor in the ab sence of lithic grains, par tic u larly in quartzose sam ples (Worden et al, 2000). Po ros ity in fine-grained de pos its is mainly re duced by me chan i cal com pac tion (e.g., Mansurbeg et al, 2008). In the sand stone rich in de tri tal quartz, pore spaces are preserved be cause me chan i cal com pac tion is pre vented by the de tri tal grain frame work.…”

Section: Influence Of Diagenetic Alteration and Composition On Reservmentioning

confidence: 99%

“…Thus, they con trib ute to the pres erva tion of po ros ity in these de pos its (cf. Storvoll et al, 2002;Mansurbeg et al, 2008;Abouessa and Morad, 2009). This supports the abun dance of quartz overgrowths in sand stone that has low grain-coat ing clays.…”

Section: Authigenic Clay Mineralsmentioning

confidence: 99%

“…This may be due to more abun dant cir cu la tion of me te oric wa ter in the Narra been Group (e.g., Mansurbeg et al, 2008).…”

Section: Authigenic Clay Mineralsmentioning

confidence: 99%

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The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

Gahtani¹

2013

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The in flu ence of diagenetic al ter ations on po ros ity in the Tri as sic Narra been Group, South ern Syd ney Ba sin, Aus tra lia Pe trog ra phy of the Tri as sic Narra been Group (South ern Syd ney Ba sin of Aus tra lia) was de scribed by thin sec tion, scan ning elec tron mi cro scope and X-ray dif frac tion tech niques. Sand stone com po si tion in cludes mostly lithic grains with mi nor quartz, feld spar, mica and heavy min er als; litharenites and sublitharenites are com mon and quartzarenites are rare. Quartz in cludes monocrystalline and polycrystalline grains while the feld spar in cludes both K-feld spar and plagioclase. Vol ca nic, sed i mentary and chert rock frag ments are pres ent. In thin sec tion po ros ity is vis i ble in all units, par tic u larly the coarse-grained de posits. Sec ond ary po ros ity is greater than the pri mary po ros ity. The diagenetic al ter ations in clude com pac tion, quartz overgrowths, authigenic clay min er als, car bon ate ce ment and authigenic feld spar. Com pac tion oc curred in all units dur ing diagenesis. Both early and late diagenetic car bon ate ce ment is im por tant in the Narra been Group. Pore-fill ing car bon ate cement re duced po ros ity whereas dis so lu tion of car bon ate re sulted in sec ond ary po ros ity. Authigenic clay min er als are widespread in all units fill ing pores and oc cur ring as grain-coat ings on de tri tal and authigenic grains. Where they coat quartz grains they pre serve po ros ity by pre vent ing growth of quartz overgrowths. Dis so lu tion of un sta ble feld spar and lithic grains pro vided sec ond ary po ros ity. In the Narra been Group, shale and siltstone are abun dant in the Wom barra Claystone, Stanwell Park Claystone, Bald Hill Claystone and New port For ma tion, form ing lithological seals and con fin ing lay ers. Mi nor sandstone beds oc cur in the Wom barra Claystone and con tain more po ros ity. Me dium-and coarse-grained sand stone is com mon in the Coal cliff Sand stone, Scarborough Sand stone and Bulgo Sand stone and shows low to mod er ate po ros ity. Thus, these sand stone units prob a bly con tain gas or wa ter.Key words: pe trog ra phy, diagenesis, pri mary po ros ity, sec ond ary po ros ity, quartz over growth, car bon ate ce ment. INTRODUCTIONIn the Syd ney Ba sin (Aus tra lia), the Narra been Group is the low er most of three Tri as sic rock units and is lo cated be tween the Up per Perm ian Illa warra Coal Mea sures and the Hawkesbury Sand stone (Ward, 1971a). Fine-grained sed i ment in the Narra been Group was pre vi ously stud ied by sev eral authors (e.g., Baker, 1956;Loughnan et al., 1964Loughnan et al., , 1974Goldbery and Hol land, 1973;Retallack, 1977). Ward (1972) noted quartzose, quartz-lithic and vol ca nic sand stones as the three sed i ment suites in the Narra been Group. Prov e nance mark ers of fore land ba sin-fill sed i ments were de ter mined by Cow an (1993). The com po si tion and tex ture of the Narra been Group were de scribed by McElroy (1954). De scrip tions of the pe trology in the N...

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Linking Diagenesis to Sequence Stratigraphy: An Integrated Toolfor Understanding and Predicting Reservoir Quality Distribution

Morad

Ketzer

Ros

2013

Linking Diagenesis to Sequence Stratigraphy

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Diagenesis and reservoir quality evolution of palaeocene deep-water, marine sandstones, the Shetland-Faroes Basin, British continental shelf

Cited by 176 publications

References 71 publications

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

Linking Diagenesis to Sequence Stratigraphy: An Integrated Toolfor Understanding and Predicting Reservoir Quality Distribution

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