Ecological Systems and Devices Annotation << Back Statistical Analysis of the Content of Petroleum Products in Moscow Groundwater Rozental O.M., Dubov N.D. The content of petroleum products on the territory of the South-Western Administrative District of Moscow in the underground aquifer of the Volzhsko-Albian terrigenous complex was studied. Using MODFLOW modeling and descriptive geostatistics methods, it was shown that there is an intensive exchange of this substance that pollutes the subsoil between observation wells. This is evidenced, in particular, by the discovered cause-and-effect relationships between time series of measurements at observation wells, even if the latter are separated by many kilometers of distances. These are the connections reaching 10 km in the territory adjacent to the shores of the Moscow River. It has been suggested that in the capillary-porous medium of the Teplostan Upland of the South-Western Administrative District there is a developed network of mass exchange of liquid petroleum products between the zones where observation points are located. The work discovered fragments of this network, knowledge of the structure of which as a whole and the kinetics of the transfer of water and pollutants in it is a necessary condition for the use and protection of subsoil. It was noted, however, that this requires complex engineering-geological surveys with an increase in the frequency of measurements, now carried out every six months, as well as an increase in the number of observation wells, the density of which is currently less than one per 10 km2. Keywords: geostatistical studies, MODFLOW model, pollution of the subsurface with petroleum products, water-bearing rocks, covariance of controlled indicators, cause-and-effect relationships. Pp. 22-34.