MT in Siberia

An important geophysical event of recent years in Russia was the realization of regional works in the Asian part of Russia along geotraverses 1-SB, 2-SB, 3-SB and 2-DV.

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Geotravers 1-SB

Shown below is resistivity cross-section of the Earth's crust along the 800 km long segment of 1-SB profile.

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In the region of Siberian Craton, within the Baykit Anteclise, a conductive layer of resistivity 100 Ohm·m and thickness 10-15 km is clearly distinguished in the middle crust. The nature of anomalous conductance of this layer is probably associated with the presence of fluids in the region of rock disintegration at the depths of brittle to flowing rock state transition.

At present, works aimed at studying the geoelectric structure of the Earth's crust in oil- and gas-bearing provinces are carried out. In this connection, of great practical interest is the mid-crustal conductive layer detected within the Baykit Anteclise of the Siberian Craton (where the Yurubcensk-Tokhomsk deposit, the largest one in the East Siberia, is located) and in the region of huge Romashkinsky deposit within the East-European Craton.

Geotravers 3-SB

Figure below illustrates the sedimentary cover geoelectrical structure of the Siberian Craton along the “3-SB” line (shown part is about 700 km in length). Highly conductive layer corresponding to the Riphaean mainly conductive sediments within the Angara Foldbelt (southern part of the profile) in the depth range of 7-11 km. The high conductivity of this layer is likely due to it’s increased porosity and water mineralization. The conductive layers of the similar nature are also observed in the Kureika Syneclise.

At the same time the Riphaean sediments become more resistive in the Baikit Anteclise, showing an evidence for different lithology of the Riphaean within the various tectonic structures.

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