ИСТИНА

The unconventional shale reservoirs of the Eastern and Central Ciscaucasia have extremely low permeability. Therefore, the sweet spots of study rocks are the intervals with natural fractures and high brittleness values. In such rocks, hydraulic fracturing is commonly used to increase hydrocarbon production. To study unconventional shale reservoirs, it is necessary to develop and use more complex petro-elastic models that allow taking into account the standard measurements of the elastic rock properties and the microstructure of the pore space and the anisotropy parameters. The dynamic brittleness index can be calculated using dynamic Young modulus and Poisson ratio as the results of pre-stack seismic inversion. The seismic geometrical attributes give information about the fractured zone. This work shows how to identify sweet spots using complex analysis of the results of anisotropic petro-elastic modelling and seismic interpretation.