Physical Properties and Composition of Devonian Carbonate and Siliciclastic Rocks from Estonia

Shogenova, Alla; Kleesment, A; Jõeleht, Argo; Shogenov, V.; Vaher, R.

doi:10.3997/2214-4609-pdb.6.p258

Cited by 4 publications

(7 citation statements)

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“…2). This corresponds to the results reported for the northern shallow part of the basin, where carbonate cementation has higher influence on the reduction of the porosity of Cambrian sandstones than clay cement, and grain-size influences the porosity of these rocks to a lesser degree than cementation (Shogenova et al 2001a).…”

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confidence: 90%

Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin

Shogenov¹,

Shogonova²,

Vizika-Kavvadias³

et al. 2015

Estonian J. Earth Sci.

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The objectives of this study were (1) to review current recommendations on storage reservoirs and classify their quality using experimental data of sandstones of the Deimena Formation of Cambrian Series 3, (2) to determine how the possible CO 2 geological storage (CGS) in the Deimena Formation sandstones affects their properties and reservoir quality and (3) to apply the proposed classification to the storage reservoirs and their changes during CGS in the Baltic Basin.The new classification of the reservoir quality of rocks for CGS in terms of gas permeability and porosity was proposed for the sandstones of the Deimena Formation covered by Lower Ordovician clayey and carbonate cap rocks in the Baltic sedimentary basin. Based on permeability the sandstones were divided into four groups showing their practical usability for CGS ('very appropriate', 'appropriate', 'cautionary' and 'not appropriate'). According to porosity, eight reservoir quality classes were distinguished within these groups.The petrophysical, geochemical and mineralogical parameters of the sandstones from the onshore South Kandava and offshore E6 structures in Latvia and the E7 structure in Lithuania were studied before and after the CO 2 injection-like alteration experiment. The greatest changes in the composition and properties were determined in the carbonate-cemented sandstones from the uppermost part of the South Kandava onshore structure. Partial dissolution of pore-filling carbonate cement (ankerite and calcite) and displacement of clay cement blocking pores caused significant increase in the effective porosity of the samples, drastic increase in their permeability and decrease in grain and bulk density, P-and S-wave velocity, and weight of the dry samples. As a result of these alterations, carbonate-cemented sandstones of initially 'very low' reservoir quality (class VIII), 'not appropriate' for CGS, acquired an 'appropriate' for CGS 'moderate' quality (class IV) or 'very appropriate' 'high-2' reservoir quality (class II). The permeability of the clay-cemented sandstones of 'very low' reservoir quality class VIII from the lower part of the E7 reservoir was not improved. Only minor changes during the alteration experiment in the offshore pure quartz sandstones from the E6 and E7 structures caused slight variations in their properties. The initial reservoir quality of these sandstones ('high-1' and 'good', classes I and III, respectively, in the E6 structure, and 'cautionary-2', class VI in the E7 structure) was mainly preserved.The reservoir sandstones of the Deimena Formation in the South Kandava structure had an average porosity of 21%, identical to the porosity of rocks in the E6 structure, but twice higher average permeability, 300 and 150 mD, respectively. The estimated good reservoir quality of these sandstones was assessed as 'appropriate' for CGS. The reservoir quality of the sandstones from the E7 offshore structure, estimated as 'cautionary-2' (average porosity 12% and permeability 40 mD), was lowest among the studied structures a...

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confidence: 90%

Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin

Shogenov¹,

Shogonova²,

Vizika-Kavvadias³

et al. 2015

Estonian J. Earth Sci.

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“…The absolute value of correlation is relatively low owing to shallow depth of the Estonian sedimentary basin. Such a correlation should be stronger in the deeper central and southern parts of the Baltic sedimentary basin, as has been described for the Baltic Cambrian rocks (Shogenova et al 2001(Shogenova et al , 2002.…”

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confidence: 61%

Lithology and evolution of Devonian carbonate and carbonate-cemented rocks in Estonia

Kleesment¹,

Shogenova²

2005

Proceedings of the Estonian Academy of Sciences. Geology

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“…The above-mentioned dependence supports the idea of early diagenetic dolomitization of the studied rocks. The higher porosity, which is out of the porosity/insoluble residue correlation, is interpreted as secondary porosity, associated with late diagenesis of lithified sediment -rock (Shogenova & Puura 1997, 1998Shogenova 1998;Shogenova et al 2003;Kleesment & Shogenova 2005). Dolomitic rocks of different ages vary in porosity (Fig.…”

Section: Resultsmentioning

confidence: 99%

Dolomitization and sedimentary cyclicity of the Ordovician, Silurian, and Devonian rocks in South Estonia

Kallaste¹,

Shogenova²,

Teedumäe³

2006

Proceedings of the Estonian Academy of Sciences. Geology

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Physical Properties and Composition of Devonian Carbonate and Siliciclastic Rocks from Estonia

Cited by 4 publications

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Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin

Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin

Lithology and evolution of Devonian carbonate and carbonate-cemented rocks in Estonia

Dolomitization and sedimentary cyclicity of the Ordovician, Silurian, and Devonian rocks in South Estonia

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Physical Properties and Composition of Devonian Carbonate and Siliciclastic Rocks from Estonia

Cited by 4 publications

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Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO2storage in the Baltic Basin

Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO2storage in the Baltic Basin

Lithology and evolution of Devonian carbonate and carbonate-cemented rocks in Estonia

Dolomitization and sedimentary cyclicity of the Ordovician, Silurian, and Devonian rocks in South Estonia

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Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin

Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO₂storage in the Baltic Basin