The possibility of using river seismic data for oil and gas exploration to study the deep structure of the Earths crust is shown. This method uses water seismic source points and bank-mounted autonomous seismic recorders installed for continuous seismic recording. About 2700 km of seismic profiles were completed by the CDP-2D method along the rivers of Eastern Siberia (Lena, Nizhnyaya Tunguska, and Vitim). The structure of the upper part of the Earths crust (up to several kilometers) has been studied, while its deep structure remains unknown. It is shown that the materials of seismic river surveys carried out along a 60-km section of the profile in the lower reaches of the Lena River, using the method developed by the Geophysical Survey, Russian Academy of Sciences, contain data allowing us to construct cross sections throughout the thickness of the Earths crust up to the Moho boundary. Low-amplitude fluctuations of reflected waves from deep boundaries are distinguished due to the wide dynamic range of the devices used and the multiple summation, which is significantly higher than in the case of the traditional seismic surveys. The high multiplicity is achieved by reducing the distance between blast points, increasing the sounding bases and the binning area.
