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[Basic principles]  [Resistivity prospecting]
[Logging]  [Well seismic surveying]

Basic principles

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Basic principles course, not yet available in english (33 pages) (649 Ko)
 
This written course takes again the basic concepts necessary to comprehension of the following modules. It treats bases of resistivity, seismic velocity and radioactivity. It also brings a further information on the densities.
 
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Chart 1 (1 page) (56 Ko)
 
This Chart makes it possible to obtain the resistivity of a solution for a given temperature and a NaCl salinity.
 
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Chart 2 (1 page) (17 Ko)
 
If we know the salinity of a water and its composition, we can with chart2, obtain coefficients which make it possible to pass from various salts to the NaCl equivalent.
 
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Chart 3 (1 page) (27 Ko)
 
Chart 3 connects porosity to the formation factor for various types of rocks.
 

[Basic principles]  [Logging]  [Well seismic surveying]

Resistivity prospecting

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Resistivity prospecting course, not yet available in english (102 pages) (4,7 Mo)
 
This course presents the resistivity methods in D.C. current .
 
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Bilogarithmic diagram (1 page) (64 Ko)
 
This bilogarithmic diagram helps for the representation of the electrical sounding.
 
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Sounding page (1 page) (17 Ko)
 
This sounding page enables you to raise your measurements at the time of an electric sounding.
 
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Chart CH1 (1 page) (67 Ko)
 
For sounding with 2 layers, the results can be compared with the Chart CH1 which contains precalculated curves for several models (thickness and varied resistivities).
 
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LCD curve of A type (1 page) (69 Ko)
 
Curve used for the interpretation of sounding with 3 layers or more.
 
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LCD curve of H type (1 page) (83 Ko)
 
Curve used for the interpretation of sounding with 3 layers or more.
 
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LCD curve of K type (1 page) (96 Ko)
 
Curve used for the interpretation of sounding with 3 layers or more.
 

Logging

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Aquiferous logging course, not yet available in english (127 pages) (9 Mo)
 
This course presents the logging methods(for water research): continuous recording of physical or chimical parameters in a borehole.
 
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Petroleum logging course, not yet available in english (78 pages) (8,9 Mo)
 
This course presents the logging methods(for oil research): continuous recording of physical or chimical parameters in a borehole.
 
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Chart 5 (1 page) (14 Ko)
 
Chart 5 is used to correct Rmfe for values lower than [0.1 Ohm.m], in order to calculate the Rw value.
 
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Chart 6 (1 page) (144 Ko)
 
Chart 6 is used to calculate the correction factor related with the the thickness of the layer which allows to correct the deflexion read on the S.P. log.
 
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Chart 7 (1 page) (173 Ko)
 
Chart 7 is used to find the Rwe value in function of the temperature and the Rmfe value.
 
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Chart 8 (1 page) (187 Ko)
 
Chart 8 is used to make the normal correction when the Ra/Rm ratio is higher than 2.
 
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Chart 9 (1 page) (14 Ko)
 
Chart 9 is used to determine the porosity and the lithology with the density and neutron log.
 
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Chart 10 (1 page) (241 Ko)
 
Chart 10 is a "MN plot" used to determine the lithology with a sonic, a neutron and density porosity.
 
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Chart 11 (1 page) (385 Ko)
 
Chart 11 is a"MID plot" used to compare the values matrix density and the velocity of the acoustic wave in the matrix.
 
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Chart 12 (1 page) (555 Ko)
 
Chart 12 is a"cross plot" between the porosity read on the limestone calibrated neutron and the density read on the calibrated gamma-gamma when the drilling fuild is mud.
 

[Basic principles]  [Resistivity prospecting]  [Logging]

Well seismic Surveying

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Well seismic course (43 pages) (1 Mo)
 
This course presents the vertical seismic profiles based on the recording of a seismic signal with a geophone placed in the borehole.