Abstract
The article presents the results of studying petrophysical rock properties of the Bazhenov Formation of the South-Eastern part of Kaymysovsky Vault with the Gas Research Institute (GRI) method. The authors have constructed dependence charts for bulk and grain density, open porosity and matrix permeability vs. depth. The results of studying petrophysical properties with the GRI method and core description have allowed dividing the entire section into three intervals each of which characterized by different conditions of Bazhenov Formation rock formation. The authors have determined a correlation between the compensated neutron log and the rock density vs. depth chart on the basis of complex well logging and petrophysical section analysis. They have determined a promising interval for producing hydrocarbons from the Bazhenov Formation in the well under study. Besides, they have determined the typical behavior of compensated neutron logs and SP logs on well logs for this interval. These studies will allow re-interpreting available well logs in order to determine the most promising interval to be involved in Bazhenov Formation development in Tomsk Region.
Highlights
Oil companies have recently started paying greater attention to unconventional reserves due to the depletion of conventional hydrocarbon resources
The Gas Research Institute (GRI) method allows significantly reducing the time of permeability experiments (2,000 seconds) and excluding the impact of natural fracturing on the values of the parameter under consideration
Conclusion the GRI method was first applied in Russia at the laboratory of Tomsk Polytechnic University to study reservoir rocks with ultra-low reservoir properties
Summary
Oil companies have recently started paying greater attention to unconventional reserves due to the depletion of conventional hydrocarbon resources. The biggest unconventional oil reservoir in Russia is the Bazhenov Formation located in the West Siberian Basin. The oil pools of this formation are considered one of the most important targets to replenish hydrocarbon resources in Russia [1, 2]. The uniqueness of the Bazhenov Formation consists in the fact that it, on the one hand, is the main source rock of the West Siberian Basin and, on the other hand, it is reservoir. Bazhenov Formation rocks are a source of both existing and potential oil, which indubitably should be taken into account during the selection of oil production technologies for such complicated reservoirs [3]. The main technology used to produce movable oil from the Bazhenov Formation is horizontal drilling with a subsequent multistage hydraulic fracturing [3]. The thermal gas treatment technology is being tested for producing potential oil from kerogen-containing rocks in Russia [4, 5]
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