On the fundamental possibility of using the bacterial and catagenetic hypotheses of the origin of oil in assessing its resources

Research subject. The estimations of oil resources in Western Siberia obtained using a basin modeling the Bazhenov formation as an source stratum indicated significant deficit its potential, calculated based on pyrolytic kinetic parameters catagenesis. Aim. To search for possible additional generating mechanisms parallel to catagenesis, thus clarifying conceptual foundations modern theory organic origin oil. Key points. Based review literature publications, hypothesis was formulated about evolution matter from sedimentary flow floccules injection proto-oil into microcracks autofluid fracturing rocks. In upper unconsolidated bottom sediment layers, biofilms appear whose microbial matrix forms basis future kerogen. Proto-oil bitumoids by-product biofilm metabolism under anaerobic conditions at diagenesis stage. Рroto-oil are encapsulated and absorbed surfaces inside chambers conducting channels polymer (future kerogen). Local ultra-high pressure (LUHP) kerogen grains appears final “smectite – illite” transition stage host clays, acting driving force bitumoid expulsion grains. On walls microcracks, undergo hydropyrolysis, consuming cohesive film water changing surface philicity. Microphotographs SEM images thin sections provided order illustrate LUHP-expulsion traces. Two types rocks differentiated possibility LUHP expulsion: those with plastic mineral framework rigid framework. Conclusion. presence porous spaces filled established immature potentially This mass is resource generation within “oil window”. Their volume can be estimated attributed certain temperature range. Directions further research outlined.