Influence of temperature on electrical conductivity on shaly sands

Geophysics ◽  
1992 ◽  
Vol 57 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Pabitra N. Sen ◽  
Peter A. Goode
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Pore Space ◽  
Clay Content ◽  
Large Temperature ◽  
Measured Temperature ◽  
Water Conductivity ◽  
Influence Of Temperature ◽  
Counter Ions ◽  
Influence Of Temperature On

In boreholes, temperatures vary and to extract hydrocarbon saturation from conductivity measurements, the influence of temperature on water and rock conductivities must be accounted for. The mobility [Formula: see text] of the counter‐ions due to clays and the electrical conductivity of pore‐filling brine show large changes with variation in temperature, whereas the microgeometry of the pore space exhibits negligible change. Using this idea, the temperature dependence of [Formula: see text] is extracted using data on dc electrical conductivity of shaly sands (σ) containing varying amounts of clay. The mobility of [Formula: see text] counter‐ions is found to vary approximately linearly with temperature. This explicit relationship is tested by comparing the predicted temperature dependence against the measured temperature dependence of conductivity of a set of rocks with high and low clay content. While the rock conductivity shows a large temperature dependence, the resistivity index is less sensitive to temperature. An approximate formula, which is superior to Arps’s formula, for water conductivity as a function of temperature is obtained.

scholarly journals Temperature dependence of the indentation size effect

2010 ◽  
Vol 25 (7) ◽  
pp. 1225-1229 ◽  
Author(s):  
Oliver Franke ◽  
Jonathan C. Trenkle ◽  
Christopher A. Schuh
Keyword(s):  
High Temperature ◽  
Size Effect ◽  
Temperature Dependence ◽  
Thermal Activation ◽  
Indentation Size Effect ◽  
Inert Atmosphere ◽  
Length Scale ◽  
Indentation Size ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

The influence of temperature on the indentation size effect is explored experimentally. Copper is indented on a custom-built high-temperature nanoindenter at temperatures between ambient and 200 °C, in an inert atmosphere that precludes oxidation. Over this range of temperatures, the size effect is reduced considerably, suggesting that thermal activation plays a major role in determining the length scale for plasticity.

scholarly journals The electrical conductivity of jet fuels F–34 and F–35 (JET A–1) in distribution

2015 ◽  
Vol 36 (1) ◽  
pp. 123-134
Author(s):  
Tomasz Białecki
Keyword(s):  
Electrical Conductivity ◽  
Jet Fuel ◽  
Jet Fuels ◽  
Static Electricity ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Military Unit

Abstract The paper presents a changeability of electrical conductivity of jet fuels in distribution. Author described the methods used to prevent the formation of the dangers of static electricity. Research was carried out on two basic fuels used worldwide to power engines in civil (Jet A – 1) and military aircrafts (F – 34), during real fuel supplies in aviation military unit. Results of influence of temperature on the electrical conductivity of jet fuel are presented.

To: “Influence of temperature on electrical conductivity of shaly sands” by P. N. Sen and P. A. Goode (January 1992 GEOPHYSICS, p. 89–96)

Geophysics ◽  
1992 ◽  
Vol 57 (12) ◽  
pp. 1658-1658 ◽  
Keyword(s):  
Electrical Conductivity ◽  
Typographical Error ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

An error has been found in equation (9) that has caused difficulty to some readers. The term which reads 0.214*M should read 0214*sqrt(M). In addition, there is a typographical error in the title: It appears as “conductivity on shaly sands”.

Influence of Microgeometry on Membrane Potential of Shaly Sands

1990 ◽  
Vol 195 ◽  
Author(s):  
Pabitra N. Sen
Keyword(s):  
Electrical Conductivity ◽  
Membrane Potential ◽  
Pore Space ◽  
Geometrical Parameters ◽  
Formation Factor ◽  
Water Conductivity ◽  
Shaly Sand ◽  
Local Geology ◽  
Geometrical Factors

ABSTRACTThe microgeometry of the pore space influences the membrane potential Em. and theDC electrical conductivity σ of a shaly sand in a similar manner, independent of the details of the geometry: Em and σ being related via the conductivities of cations and σanions;σ=σcation + σ onion, and Em α σ cation/(σcation + σanion). This explicit relationship is used to investigate the role of the geometrical factors which influence both Em and σ in a related manner. The dependence of σ on the water conductivity σw can be well approximated with four geometrical parameters which can be obtained from the slopes and the interceptsof σ vs. σw curve at high and low salinities. We show that these geometrical factors appear in the expression for Em a well. These geometrical parameters (one of them is the formation factor) vary from rock to rock, and any trend in these parameters depend on the local geology.

Investigation of the Payne Effect and its Temperature Dependence on Silica-Filled Polydimethylsiloxane Networks. Part II: Test of Quantitative Models

2005 ◽  
Vol 78 (2) ◽  
pp. 232-244 ◽  
Author(s):  
F. Clément ◽  
L. Bokobza ◽  
L. Monnerie
Keyword(s):  
Temperature Dependence ◽  
Volume Fraction ◽  
Variable Temperature ◽  
Experimental Results ◽  
Influence Of Temperature ◽  
Payne Effect ◽  
Quantitative Models ◽  
Filler Volume Fraction ◽  
Influence Of Temperature On

Abstract The results obtained in Part I, on Polydimethylsiloxane (PDMS) networks filled with treated Aerosil A300 silica at variable temperature and various loadings, have been used to test the quantitative models of the Payne effect proposed by Kraus, Huber-Vilgis, and Maier-Göritz. Each model is able to account only for a part of the experimental results: Kraus and Maier-Vilgis for the variation of the Payne effect with filler volume fraction, Maier-Göritz for the influence of temperature on the Payne effect. But neither of these quantitative models is able to fit the whole set of experimental results on G′ and G″ with a unique set of parameters.

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