Jurassic Landscapes of West Siberia As the Determining Factor in the Formation of Highly Biologically Productive Thicknesses

Research results are based on the analysis of microbenthos paleocenosises, along with geochemical factors and morphostructure of thick characteristics of individual rock types, as well as particular features of the West Siberian Basin subaqueous environments are recreated taking into account seismic facies construction. Examined paleolandscapes have high bioproductivity of the primary organic matter, and paleorelief types promising for formation of sand bodies are defined.

Fulfilled investigations show that the main generation potential of the primary organic matter in the Early Jurassic associates with depression zone sediments, and by the end of the Middle Jurassic, considerable bulk of organic matter accumulated on submarine elevations and their slopes. Permeable strata were formed in environments of insular sea dissected topography with potentially extensive development of offshore and alongshore bars -improved reservoirs.