Print this pagePhysical-Chemical Investigation of the Recent Soils as a New Method of Detection in Oil and Gas Deposits
Polivtsev, Anatoliy V., Lesia A. Buzhuk, Svyatoslav V. Kushnir, Myroslava B. Yakovenko, Ukrainian State Geological Research Institute, Kyiv, Ukraine
The investigation objects were patterns from various units of chernozems and darkishgrey soils
(podzolised, salted etc.) from the flanks of Dnieper-Donets Depression covering oil and gas-bearing and
non-productive structures. The research was aimed to ascertain optimal
circumstances for laboratory measurements to reveal the specific physical-chemi-cal conditions made up by hydrocarbons microseepage effect.
The feature of investigations is their supplement by new
procedures (Polivtsev, 1999):
a.
o
Eh-pH of soil solutions were measured during various periods – from several
minutes to several weeks at different temperature. So, we obtain more reliable
data than those obtained from ordinary static measurements.
b.
o
Regulation of biochemical activity by adding various liquids and gases enable
inhibit or catalyse redox
reactions and restrict the effect of oxygen system.
c.
o
Eh-pH dynamic measurements performed in different phases of system “solid
soil–solution”. That enabled observe the effect of principal for equilibrium
adjustment reactions between the compounds of various phases. Hence, we
determine the dominant at the moment Eh-pH-conditions with their gradients from
one phase to another and obtain more helpful information.
The
results. The feature
of soils covering hydrocarbons fields and zones of faults is anomalous
character of redox reactions caused by hydrocarbons microseepage. That reflects in anomalous Eh-pH dynamics.
The optimal time of soil solutions preparatory exposition was determined.
Employment the specific additions to solutions enable sensibly reduce the
biochemical activity fluctuations and get more typical experiment conditions
for patterns with different storage time. The reagents increasing hydrocarbons microseepage effect in soils should be employed in
geochemical exploration.