The results of regional geological exploration at the expense of the federal budget on the territory of the Central Tunguska prospective petroleum region located in the Republic of Sakha (Yakutia) over the past 17 years are analyzed. To date, the territory of the Yakut part of the Central Tunguska PPR is closed by modern regional geological exploration by 77.9 %, which allows us to speak about the completion of the regional stage of geological exploration here. It was shown that Vendian terrigenous deposits and Vendian carbonate, subsalt deposits of the Lower Cambrian, as well as carbonates of intersalt deposits of the Cambrian have the greatest prospects for oil and gas potential. Riphean deposits have a limited distribution. Based on the results of these works, promising objects for prospecting work were identified.

An important application of the multichannel surface wave (MASW) method is seismic safety assessment. The key parameters in the calculation of increments in the input of seismic microzoning are the thickness and average velocity of the soil mass lying on the base of more rigid rocks. To determine these parameters, we propose a new method for constructing horizontally layered models of the upper part of the geological section using the features (positions of extrema of the second derivative) of the dispersion curves of phase velocities of the Rayleigh surface wave, which, as shown by numerical experiments, are associated with the position of contrasting boundaries in the medium under study. (e.g., the boundary between soils and rocks). This approach is much simpler than the problem of recovering a horizontally layered model traditionally solved in the MASW method from a set of phase velocities for a sequence of frequencies and does not require an initial approximation and/or any restrictions on the possible values of the model parameters. In the case of two-layer and three-layer media, our approach is reduced to a simple and fast application of explicit formulas.

The paper considers PP-wave attenuation in an anisotropic fractured medium covering the target layer. Azimuthal and offset variations of inverse quality factor (QVOA) were estimated from 3D seismic data by a software module developed in IPGG SB RAS. Spectral ratio method was used to estimate attenuation. We used developed QVOA inversion module on 3D CDP data from one of the fields in the Republic of Serbia. The distributions of fracturing orientation and attenuation anisotropy degree in the layer of Neogene rock are presented as results. This layer covers Paleozoic basement, which is the main target layer for oil exploration in this area. The obtained distributions should be considered during AVAZ inversion interpretation of reflections from Paleozoic basement due to possible footprints.

The article discusses the method of petrophysical research, which was developed at the beginning of the XXI century. The study provides data related to the study of the Volga–Ural oil and gas province. Using the example of the Romashkinskoe field, it is shown how the use of petrophysical characteristics made it possible to clarify the interpretation of geophysical studies of wells. The conclusion is made about the relevance of using this method in analyzing the state of mineral reserves in the deposits of the Volga-Ural province.

We present a simple and robust approach for calculating frequency-dependent rays in three dimensional media. The proposed method simulates propagation of locally plane fragment of a wavefront. Ray properties depends on velocity distribution in some sub-volume around the ray and on wavelength in each point. Numerical experiment demonstrates the applicability of the proposed method to calculate travel-times and ray-based acoustic wavefields in complex 3D environments with the presence of slat intrusion.