Compressibility of unconsolidated, arkosic oil sands

Sawabini, C. T.; Chilingar, George V.; Allen, B.R.

doi:10.1016/0148-9062(74)91156-5

Cited by 2 publications

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“…The difference remains conspicuous until around fifty percent saturation where the difference in the ε b -S relationships for the two conditions becomes insignificant. We believe this behaviour has to do with the compressibility of the unconsolidated porous media (Sawabini et al 1974) and the CO 2. Increasing Figure 6.…”

Section: Effect Of Pressurementioning

confidence: 99%

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow

Abidoye

Das

2015

Geophys. J. Int.

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S U M M A R YThe relative permittivity (ε r ) and the electrical conductivity (σ ) of porous media are known to be functions of water saturation (S). As such, their measurements can be useful in effective characterisations and monitoring of geological carbon sequestration using geoelectrical measurement techniques. In this work, the effects of pressure, temperature and salt concentration on bulk ε r -S and σ -S relationships were investigated for carbonate (limestone) and silicate porous media (both unconsolidated domains) under dynamic and quasi-static supercritical CO 2 (scCO 2 )-brine/water flow. In the silica sand sample, the bulk ε r (ε b ) for scCO 2 -water decreases as the temperature increases. On the contrary, slight increase was seen in the ε b with temperature in the carbonate sample for the scCO 2 -water system. These trends are more conspicuous at high water saturation. The ε b -S curves for the scCO 2 -water flow in the silica sand also show clear dependency on the domain pressure, where ε b increases as the domain pressure increases. Furthermore, the bulk σ (σ b ), at any particular saturation for the scCO 2 -brine system rises as the temperature increases with more significant increase found at very high water saturation. Both ε b and σ b values are found to be greater in the limestone than silica sand porous samples for similar porosity values. Based on different injection rates investigated, we do not find significant dynamic effects in the ε b -S and σ b -S relationships for the scCO 2 -brine/water system. As such, geoelectrical characteristics can be taken as reliable in the monitoring of two-phase flow system in the porous media. It can be inferred from the results that the geoelectrical techniques are highly dependent on water saturation. This dependence is more conspicuous at higher water saturation. Different mathematical models examined show their reliability at different water saturation ranges. The polynomial fit developed in this work takes into consideration the fluid pressure in the system as well as the initial bulk relative permittivity prior to the injection of CO 2 . The polynomial fit shows a good reliability in the prediction of the geo-electrical properties of the CO 2 -water-porous media system, especially at higher water saturation. In comparison, the mixing model from the literature shows more reliability in the prediction of similar property at lower water saturation.

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Section: Effect Of Pressurementioning

confidence: 99%

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow

Abidoye

Das

2015

Geophys. J. Int.

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“…Compressibility values for sands obtained in a hydrostatic compaction apparatus are usually about twice as high as those determined on using uniaxial compaction equipment. Sawabini et al (1974) found that compressibility increases with increasing feldspar content. Geertsma (1957) Chilingarian et al, 1973, p.…”

Section: Vb Apt!'mentioning

confidence: 96%

A Review of the Importance of Gravitational Sediment Compaction in Oil Producing Areas

Rieke

Chilingarian

Fertl³

1978

Energy Sources

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During the past quarter of a century, the exploitation of oil and gas reserves, associated with thick sequences of very fine-grained and coarsegrained rocks in the Tertiary Basins, have become increasingly important for fulfilling the world's energy needs. Many exploration and reservoir development problems have arisen which demand an analytical solution. The solution of many scientific and technological problems associated with these geologically young basin sediments requires knowledge of the origin, maintenance, and distribution of abnormally high pore-fluid pressures, chemical changes induced in the interstitial water by compaction, origin and migration of hydrocarbons, temperature gradients, clay minerals phase changes, and subsidence of the surface. Successful drilling to depths greater than 20,000 ft in these sediments and the amounts of hydrocarbons discovered and produced depend to a great extent on our knowledge of the physical and mechanical properties and deformation .characteristics of the sediments and the interrelationships among the various properties of sediments and associated interstitial fluids. This paper is a historical review of studies dealing with the effects of gravitational compaction of sediments on hydrocarbon reservoirs and souroe beds. Specific attention is given to the generation of abnormal pore-fluid pressures, chemistry of interstitial fluids compaction models, compressibility of the reservoir rocks, and surface subsidence.

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Compressibility of unconsolidated, arkosic oil sands

Cited by 2 publications

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Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow

A Review of the Importance of Gravitational Sediment Compaction in Oil Producing Areas

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Compressibility of unconsolidated, arkosic oil sands

Cited by 2 publications

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Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO2–water flow

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO2–water flow

A Review of the Importance of Gravitational Sediment Compaction in Oil Producing Areas

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Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO₂–water flow