Based on the complex interpretation of seismic and gravitу data along profile 1-SB, the parameter of weighted density was considered for different levels of the crust in Transbaikalia, Baikal region, and the Siberian Platform. The character of the distribution of weighted density in the crust emphasizes differences in the geodynamic essence of these areas. For folded regions, unlike the Siberian Platform, there is a higher contrast in the variation of weighted density in the upper layer of the consolidated crust and in the upper mantle layer.

This paper presents an overview of stochastic seismic data inversion methods, briefly discussing the evolution of seismic inversion in general. Four key stochastic inversion methods are discussed, with a more detailed examination of one of the Monte Carlo algorithms – the 1D stochastic inversion process. All stages of its practical implementation are discussed in detail. The application of the algorithm to predicting the reservoir properties of target horizons is demonstrated. This paper can serve as a structured introduction to the field of probabilistic seismic inversion algorithms.

Using the results of seismic density modeling on the 1-SB profile, the stress-strain state arising under the influence of gravity forces in the Earth's crust of the Baikal folded region was numerically studied. It has been shown that the main role in the formation of inhomogeneities of the stressed state and its anomalies is played by variations in the thickness and depth of layers of rocks with different physical and mechanical properties.

This article presents examples of the application of a passive seismic method to solve engineering seismic problems. This method is based on the extraction from a seismoacoustic noise field of standing waves generated by such noise within confined objects. The studies were conducted on both natural and man-made objects at various scales – from a few centimeters (e.g., to assess the thickness of ice cover on water reservoirs) to tens of meters (specifically, to determine the natural frequencies and vibration modes of buildings and structures).

Electrical prospecting and geochemical studies were conducted in one of the intermontane depressions of Transbaikalia to assess its oil and gas potential. For many years, this area has been considered to have low hydrocarbon prospects. Recent field studies have revealed intensive butane concentration anomalies in rocks of the upper section. Layers with improved reservoir properties were identified based on electromagnetic sounding data. The assessment of forecast resources and recoverable natural gas reserves indicated the possible presence of a medium-scale gas field and a large-scale oil field, in terms of recoverable reserves, in the studied area.