Understanding Porosity Variations through Simulating Quartz Cementation of Cambrian Sandstones

Sliaupa, S.

doi:10.3997/2214-4609.201401789

Cited by 2 publications

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“…Porosity in Middle Cambrian reservoir rocks is also controlled by mechanical and chemical compaction which is directly related to burial depth and palaeo temperature. In Western Lithuania and the adjacent offshore, the Cambrian succession was buried to depths of 1000-1300 m by the end of Caledonian deformation and was exposed to palaeo temperatures of ~ 55-65 °C (Sliaupa, 2006;Zdanaviciute et al, 2006). During the Hercynian, Cambrian sediments were buried to depths of 1900-2100 m and palaeo temperatures increased to 100°C (Sliaupa et al, 2001;Zadanaviciute and Lazauskiene, 2004).…”

Section: Middle Cambrian Reservoir Rocks In the Central Baltic Basinmentioning

confidence: 99%

The Middle Cambrian Succession in the Central Baltic Basin: Geochemistry of Oils and Sandstone Reservoir Characteristics

Zdanaviciute

Lazauskienė

Khoubldikov

et al. 2012

Journal of Petroleum Geology

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Some 36 oilfields, all producing from Middle Cambrian (Deimena Group) sandstones, are located in the central Baltic Basin in an area covering onshore Lithuania and Kaliningrad (Russia) and the adjacent offshore. This paper presents new data on the composition of crude oils from fields in this area and reviews the reservoir properties of the Deimena Group sandstones.Twenty-one crude oil samples from fields in Lithuania and Kaliningrad were analysed by standard techniques including GC and GC-MS. The oils had densities of 790.5 to 870.0 kg/m 3 , and had low asphaltene (<2.2%) and sulphur (<0.44%) contents. The gasoline fraction (b.p. >200 o C) ranged from 12-34%. The saturated hydrocarbon content was 35.3 to 77.8%, and the ratio of saturate to aromatic hydrocarbons was 2.1-5.2, indicating long-distance migration or high thermal maturities. GC analyses of saturate fractions indicated a composition dominated by n-alkanes with a maximum at C 13 -C 15 and reduced abundance in the C 20 -C 35 range. The analysed crude oil samples are characterized by relatively low concentrations of steranes and triterpanes.Biomarker data indicated an algal origin for the precursor organic matter and a clasticdominated source rock. Sterane isomerization ratios imply that the oils are in general relatively mature. Exceptions are samples from the Juzno Olempijskoye and Deiminskoye fields, Kaliningrad, which were early mature. Oil from well Gondinga-1 (Lithuania) was lightly fractionally evaporated and has a relatively higher density, higher viscosity, higher asphaltene content and lower content of saturated fractions.Stable carbon isotope ratios of crude oils and saturated and aromatic fractions were analysed. Whole oils showed little carbon isotope variation, but there were significant differences in δ 13 C ratios for saturated and aromatic fractions. The geochemical data show differences in oil sourcing and indicate the possible existence of different kitchen areas in the Kaliningrad region.Vertical and lateral variations in Deimena Group reservoir properties are controlled by variations in quartz cementation. In fields in western Lithuania, sandstone porosity ranges from

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Section: Middle Cambrian Reservoir Rocks In the Central Baltic Basinmentioning

confidence: 99%

The Middle Cambrian Succession in the Central Baltic Basin: Geochemistry of Oils and Sandstone Reservoir Characteristics

Zdanaviciute

Lazauskienė

Khoubldikov

et al. 2012

Journal of Petroleum Geology

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“…On the other hand, quartz cementation models based on empirical rate laws for porosity loss in terms of physical parameters (such as initial grain size, temperature, and surface area) can also be found in literature (e.g., Canals & Meunier, ; Walderhaug, ; Wangen, , ). Although the preceding mathematical models have been quite successful in the quantitative estimation of reservoir porosity (see ; Bjørkum et al, ; Lander & Walderhaug, ; Marchand et al, ; Sliaupa, ), they do not provide any insights into the evolving microstructures as a result of syntaxial quartz overgrowths. In order to trace the burial history and make accurate future predictions of porosity and permeability, a deep understanding of the underlying microstructural processes is imperative.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Phase‐Field Investigation of Pore Space Cementation and Permeability in Quartz Sandstone

et al. 2018

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The present work investigates the dynamics of quartz precipitation from supersaturated formation fluids in granular media, analogous to sandstones, using a multiphase‐field model. First, we derive a two‐dimensional (2‐D) Wulff shape of quartz from the three‐dimensional (3‐D) geometry and simulate the unitaxial growth of quartz in geological fractures in 2‐D in order to examine the role of misorientation and crystal c to a axis ratios (c/a) in the formation of quartz bridge structures that are extensively observed in nature. Based on this sensitivity analysis and the previously reported experiments, we choose a realistic value of c/a to computationally mimic the 3‐D anisotropic sealing of pore space in sandstone. The simulated microstructures exhibit similarities related to crystal morphologies and remaining pore space with those observed in natural samples. Further, the phase‐field simulations successfully capture the effect of grain size on (I) development of euhedral form and (II) sealing kinetics of cementation, consistent with experiments. Moreover, the initially imposed normal distribution of pore sizes evolves eventually to a lognormal pattern exhibiting a bimodal behavior in the intermediate stages. Furthermore, computational fluid dynamics analysis is performed in order to derive the temporal evolution of permeability in numerically cemented microstructures. The obtained permeability‐porosity relationships are coherent with previous findings. Finally, we highlight the capabilities of the present modeling approach in simulating 3‐D reactive flow during progressive sealing in porous rocks based on innovative postprocessing analyses and advanced visualization techniques.

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Understanding Porosity Variations through Simulating Quartz Cementation of Cambrian Sandstones

Cited by 2 publications

References 0 publications

The Middle Cambrian Succession in the Central Baltic Basin: Geochemistry of Oils and Sandstone Reservoir Characteristics

The Middle Cambrian Succession in the Central Baltic Basin: Geochemistry of Oils and Sandstone Reservoir Characteristics

Three‐Dimensional Phase‐Field Investigation of Pore Space Cementation and Permeability in Quartz Sandstone

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