The paper deals with the results of reservoir rocks research in complex geological sections of oil and gas fields in the southeastern part of the Precarpathian Trough. The reservoir formations are fractured-porous and porous sandstones and siltstones, which occur among mudstones in the form of layers with thicknesses ranging from several centimeters to 10-15 m and more. Collector and physical parameters (porosity, permeability, density, etc.) of reservoir of productive horizons vary widely due to different conditions of sediment accumulation, different degrees of pore space cementation and sorting of debris material. It has been established that the determination of the porosity coefficient in the southeastern part of the Precarpathian Trough based on the wells logging data is a difficult task. This is due to the fact that reservoir formations are characterized by a very wide range of clay and carbonate values. With the increase in carbonate and clay content, when the total value of cementing substance by weight is 15%, the sandy rock becomes a non-collector. As a result of the analysis of geological and geophysical information of reservoir rocks in this section, it was found that to increase the information content of acoustic logging, it is necessary to improve petrophysical models for the porosity coefficient estimating based on the this well logging method results. To solve the problem, in addition to the acoustic method, the results of electrical logging, spontaneous potential logging, gamma-ray logging and neutron gamma-ray logging were also used, as well as the conditions of occurrence of these reservoir rocks were taken into account