Geological structure, lithological and petrophysical properties of Neft Daşlari deposit: patterns of changes in the reservoir properties of productive strata depending on the depth of their occurrence (northwestern part of the South Caspian depression)

   Background. In this article, we investigate geological, geophysical, and physical aspects that affect the reservoir capacity of oil, gas, and gas condensate fields in the area of the Neft Daşları deposit.   Aim. The aim was to study the lithologic and petrographic features of deep-seated strata, as well as their reservoir properties, and to reveal regularities of their change with depth.   Methods and materials. To that end, the parameters of carbonation, porosity, permeability, density, granulometric composition, and longitudinal seismic wave propagation velocities were determined. Rock specimens of the Neft Daşları field were collected from exploration wells.   Results. The minimum, average, and maximum limits of the physical properties of rocks were established. The dependence of reservoir properties and other physical factors on the depth of rock occurrence was considered. The results obtained allow us to assume the oil and gas bearing capacity of deep-seated strata along with those already under operation.

rocks, formation, porosity, depth, well, density, petrophysics, horizon, drilling, geophysics, oil and gas accumulation