Overview of Lower Cretaceous Achimov Formation: Physical Properties and Their Distribution Pattern in West Siberian Basin, Russia

Table 1

Geological and physical characteristics of the Achimov Formation reservoirs in the West Siberian petroleum basin (modified based on [12]).

Parameters	Unit	Value
Average depth of reservoirs	m	2900
Average effective thickness of reservoirs	m	18.9
Porosity	%	18
Average initial oil saturation	%	52
Permeability	mD	3
Average permeability in the vertical direction	mD	0.1
Content of sandstone	%	27
Density of water under standard conditions	kg/m^3	1016
Viscosity of water under reservoir conditions	mPa·s	0.34
Initial stratum temperature	°С	95
Saturated pressure of stratum	MPa	9
Density of the oil under reservoir conditions	kg/m^3	758
Density of crude oil under standard conditions	kg/m^3	844
Initial gas content in oil	m^3/t	74.3
Volumetric coefficient of petroleum	m^3/m^3	1.26