Abstract
The report is devoted to the study of conditions for the formation of organic porosity–void spaces of organic origin formed during transformation of the organic matter into hydrocarbons, and their role in the formation of hydrocarbon accumulation in low-permeability shale strata. The experience of studying and developing known shale formations of the world testifies to the fact that such strata are hybrid phenomena, that is, they are both oiland gas-bearing strata containing traditional and non-traditional accumulations of hydrocarbons. Based on the results of the programmed pyrolysis by the Rock-Eval-6 method, an estimate has been performed to quantify organic (kerogen) porosity. This estimate allows for determining the forecast retention volume of HCs generated during catagenesis.
Highlights
The purpose of this paper is to investigate the conditions for the formation of organic porosity and its role in the formation of hydrocarbon accumulations in low-permeability shale strata
The Caucasus Maykopian series kerogen containing shale sequences is represented by a number of compact multilayered pelite rocks enclosing all possible forms of organic matter (OM) at various maturation stages [1,2,3,4,5,6]
The Rock-Eval pyrolysis method was used for studying the organic matter (OM) of the shale sequence
Summary
The purpose of this paper is to investigate the conditions for the formation of organic porosity and its role in the formation of hydrocarbon accumulations in low-permeability shale strata. It was recently revealed that oil and gas deposits are a source of HC formation and a place of HC accumulation. As examples of this phenomenon in the territory of Russia may be mentioned sequences of the Khadum and Bazhenov Formations and the Domanik horizon which are hybrid phenomena combining both conventional and unconventional hydrocarbon accumulations. The Khadum Formation in the Maykopian series (the Oligocene – Lower Miocene deposits of the Paleogene system in the Cenozoic erathem) is broadly developed in the Caucasus territory (Fig. 1).
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