Lithology and features of formation of Cambrian deposits in South-East part of the West Kiberian geosyneclise

Abstract

In the South-Eastern part of West-Siberian geosyneclise in recent years the spread of the Cambrian deposits was observed on larger territory than it was considered before. The aim of the research is to study lithological composition, conditions of formation and accumulation of Cambrian formations and to identify the types of rocks that may be associated with the opening of oil and gas fields. Methods of work: The authors have applied the paleontological methods for determining organic residues studying which the early Cambrian age was determined for the rocks exposed by drilling; lithofacial research methods, which were used to determine the conditions of formation of the lower Cambrian sediments, land and distribution zoning of the revealed lithological types of rocks within the studied area. Results: The formation of the carbonate platform deposits, started in the late Wend in the South-Eastern part of West-Siberian geosyneclise, continued during the early Cambrian. The territory of carbonate platform grew at first but to the end of the early Cambrian the carbonate platform ceased to exist. The carbonate platforms deposits are represented by sedimentary Dolomites, which grade to relatively deep-water deposits in the East and in the West. Further works may establish the development areas of the carbonate platform deposits in the Northern direction from the area studied.

Keywords

• West-Siberian geosyneclise
• Cambrian sedimentary rock
• carbonate platform
• sedimentary dolomite rocks
• cracking and leaching