Assessment of the Tectonic Factors Influence on the Deep Oil and Gas Source Rocks Formation at the Upper-Pechora Depression

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Abstract

The relevance of the work is due to the fact that in the coming years the oil and gas potential of deep deposits of the sedimentary cover, located at depths of more than 4 km, will have to be more fully studied. One of the methods that allows you to solve this problem most effectively is the construction of probabilistic statistical models. In this case, a comparison of average values and distribution densities (statistics – t and χ2), correlation analysis, regression analysis, including stepwise, as well as discriminant analysis are used. As a result of these calculations, fundamental differences in the tectonic conditions of the formation of the organic carbon initial concentrations (Ci org) before hydrocarbon (HC) generation processes were determined for the studied types of organic matter (OM) – sapropel, mixed and humus. Comparison of average Ci org values made it possible to establish the presence of statistical differences between types of OM in deep sediments at the Upper-Pechora depression. Since this structure had an asymmetrical structure typical of marginal troughs, a comparison was made of two tectonic zones - western and eastern, corresponding to its outer and inner sides. Correlation analysis showed that between the studied indicators there were connections of varying degrees of closeness and direction. Using linear discriminant analysis based on a set of tectonic indicators, differentiation by types of OM and tectonic zones was established. The performed stepwise regression analysis confirmed a significant difference in the processes of accumulation of OM of sapropel and humus types, as well as in the western and eastern regions. Thus, statistical analysis showed the decisive role of tectonic factors in the processes of Ci org concentrations formation. In addition, regression equations were constructed to describe the dependences on tectonic indicators that made it possible to predict this most important characteristic of oil and gas source rocks.

Keywords

Upper-Pechora depressiondeep sedimentsprobabilistic-statistical methodsbasin modelingoilgashydrocarbonsorganic matterorganic carbonoil and gas source rocksconcentrationtectonic characteristicsburial depthstatistical differencesforecast.

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Article information

Published
31 March 2024
Issue date
31 March 2024
Issue
Vol. 24, No. 1 (2024)
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