Elastic Properties of Cambrian Siliciclastic Rocks from the Baltic Basin

Shogenova, Alla; Sliaupa, S.; Jõeleht, Argo; Rasteniene, V.; Kirsimäe, Kalle; Bitjukova, L.; Lashkova, L.; Zabele, A.; Freimanis, A.; Hoth, Peer; Huenges, Ernst

doi:10.3997/2214-4609-pdb.15.n-24

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“…The initial and altered permeability of the clay-cemented sandstones from the E7 structure (0.13-0.18 mD) and the initial permeability of the carbonate-cemented sandstones from the South Kandava structure (0.001-0.28 mD) were in 'very low' reservoir quality class VIII. The reservoir quality of rocks decreases with increasing depth because of rock compaction, rising temperature, conformation of grains and increasing quartz cementation of sandstone with growing depth in the Baltic Basin (Shogenova et al 2001a(Shogenova et al , 2001b(Shogenova et al , 2009aSliaupa et al 2001). Our study confirms these results -the shallowest offshore structure E6 has the best reservoir properties of sandstones.…”

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confidence: 83%

“…5). The lowest acoustic velocity before the alteration was in the range of the lowest previously obtained values (Shogenova et al 2001a(Shogenova et al , 2001b, while after the experiment the P-wave velocity of sample E7-6 became the lowest among earlier and recently measured velocities (Table 4). The grain density, measured before the alteration experiment for 12 sandstone samples, was in the limits of 2664-2746 kg m -3 , decreasing after the experiment to 2635-2676 kg m -3 (Table 4).…”

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confidence: 47%

“…The physical properties of 139 samples from seven boreholes (offshore E6-1/84 and E7-1/82, onshore South Kandava 24 and 27, Dobele 91 and 92, Liepaja-San), measured recently or reported earlier, were used in this study. The K values of 127 samples and Ф values of 128 samples, grain density of 102 samples, bulk density of 129 dry samples, P-wave velocity (V P ) in 60 dry samples and S-wave velocity (V S ) in 10 dry samples comprised the recent and earlier data (Shogenova et al 2001b;Shogenov et al 2013aShogenov et al , 2013b.…”

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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

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: 47%

Section: Methodsmentioning

confidence: 99%

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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

Shogenov¹,

Shogonova²,

Vizika-Kavvadias³

et al. 2015

Estonian J. Earth Sci.

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Elastic Properties of Cambrian Siliciclastic Rocks from the Baltic Basin

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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

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Elastic Properties of Cambrian Siliciclastic Rocks from the Baltic Basin

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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

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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