Home – Home – Jornals – Russian Geology and Geophysics 2002 number 3

Lithological and geochemical interpretation of standard log data for the Bazhenov Formation (southeastern and central West Siberian Plate), their classification and 1:500,000 mapping show an argillaceous-siliceous-sapropelic composition and high organic matter (colloalginite) content of the highly resistive and gamma-active parts of the sections. The Bazhenov deposition was controlled, among other factors, by the bottom topography and the depth of the ocean which transgressed to the south-eastern West Siberian Plate in its early and, especially, intermediate evolution stages. The distribution of rock groups reflected in depth-dependent variations in apparent resistivity made a basis for distinguishing different types and classes of sections within the formation, including those promising for oil and gas.