ROLE OF ELECTROMAGNETIC FIELDS IN DEVELOPMENT OF OIL AND GAS GENERATION PROCESSES IN UNCONVENTIONAL RESERVOIR ROCKS

Abstract

The specifics of the Bazhenov Formation sediments, which are fundamentally different from traditional Green River oil shales, is that the processes of organic matter (kerogen) transformation into hydrocarbons have not yet been completed in them. The achieved paleotemperatures allowed the studied sediments to enter the main phase of oil formation during the regional catagenetic transformation of kerogen, but they failed to realize their oil-maternal potential to the full extent. At present, there are several unsolved problems for these rocks, related both to the genesis of oil and to the search for commercial hydrocarbon deposits in them and the development of technologies for their further development. The processes of «proto-oil» formation in the Bazhenov Formation sediments are still poorly understood. In fact, these processes are a system of equations with many unknowns, the correct solution of which is still impossible at the current stage of study. In our opinion, an important role in the development of oil formation processes in the Earth’s subsurface is played by magnetic fields formed under the action of a number of reasons (in particular, during the development of numerous tectonic disturbances). Our laboratory experiments by gas chromatography showed that in bitumoids of the studied samples there is a progressive shift of the «naphthenic hump» associated with internal transformations in the magnetic field. As a result of these studies, a decrease in the naphthenic fraction of hydrocarbons in samples heated in a magnetic field was recorded compared to samples without exposure to a magnetic field. Significant differences were found in paired samples of most geochemical characteristics - n-C23/24, n-C25/26, n-C26/27, n-C29/30, OEP, CPI, naphthene sum. Taking into account the influence of electromagnetic fields on the development of oil and gas generation processes allows us to create a completely new technology of «maturation» of hydrocarbon compounds (proto-oil) directly in the oil-maternal sediments and the formation of «artificial/technogenic» oil deposits.