Page 78 - Geochemical Remote Sensing of The Sub-Surface

Geoelectrochemistry and stream dispersion 5 5
TMGM

5t /,./ \~Ni ~_V\ I// "x,.~ _

Cr.lO -2 %
7"5 f.~ " rr M Cr ,t~
5
2.5
0

It
Zn/C M~C

Fb/C Cu/C

o Cl o,Tc ....

0 3km
,,oo
f
~

I ~ 2~ 3[m][ml]] ~ 5~
Fig. 2-35. Results obtained by the TMGM and MPF methods over an oil deposit in the Volga-
Ural oil-gas province, Russia: 1- Late Devonian clay, fractured limestones and dolomites; 2- Late
Devonian sandstones, aleurolites and argillites; 3- oil pool of the D3 seam; 4- profiles of the MPF
survey; 5- curves of concentration distribution of elements (from Vasilieva and Voroshilov,
1995).

samples are taken simultaneously and analysis of the products of electrochemical
reactions in solid, liquid and gaseous phases is carried out. In this way it was established
that a number of reactions of an electrochemical nature take place on the mineral
surface. In particular, studies of the cathodic processes have shown that the majority of
minerals have two wave steps on the polarisation curve. The first wave step, as a rule,
corresponds to potentials in the interval -0.3 to -1.2 V. For divalent metal sulphides this
step corresponds to the following electrochemical reaction,