Geochemistry of impurity elements of Upper Jurassic deposits of Kazan fields group

• Main Authors: Ksenia V. Gabova, Grigorii G. Kravchenko
• Format: Article
• Language: English
• Published: Perm National Research Polytechnic University 2016-06-01
• Series: Perm Journal of Petroleum and Mining Engineering
• Subjects: geochemical analysis; inductively coupled plasma; rare earth elements; Kazan oil-gas-condensate field; Boltnoe oil field; spectrum; impurity elements; normalization; standard
• Online Access: http://vestnik.pstu.ru/get/_res/fs/file2.pdf/5806/Geochemistry+of+impurity+elements+of+Upper++Jurassic+deposits+of+Kazan+fields+groupfile2.pdf

Both sandstones and fine-grain clastic debris have integrated information about factors controlling its formation processes. This information is contained in litho-geochemical characteristics. Obtained information complement and specify results of lithologic research carried by conventional methods. The subject of the research are deposits of Kazan oil-gas-condensate field and Boltnoe oil field that are located in Parabel territory of Tomsk region. In terms of structure Kazan and Bolotnoe fields are dedicated to dome uplifts of the same names and located in south-east part of Niurolsk depression within the border of 2nd class positive structure Kalgachskii Mesozoic uplift. Geological structure of the field is formed by metamorphosed basement rocks and siliciclastic deposits of different composition of Mesozoic-Cenozoic platform mantle. Productive deposits of Upper Jurassic are the field of interest. Upper series of Jurassic deposits on studied area is presented by Vasiugan, Georgiev and Bazhenov formations that are drilled and characterized in details by core. Obtained data proved the rule of change of rare earth elements composition between different conditions of marginal-marine line and showed tendency of some elements to grow and decrease of other going out from margin. Sedimentary rocks of south-east part of Niurolsk depression are differentiated in geochemical and mineral-petrographical compositions. Both are presented by wide range of variety. With use of obtained geochemical data and evaluation of indicators determined environments of sedimentation are proved. Fundamental parameters of sedimentary rocks such as composition and proximity of a source, salinity and paleoclimates are determined.