Home – Home – Jornals – Russian Geology and Geophysics 2002 number 1

Flow regimes of pore fluid were studied, with the vapor-water phase transition near solidifying intrusions of dikes and sills in a sedimentary basin taken into account. The study was based on a computer program simulating a one- or two-phase flow of the vapor-water mixture depending on the phase state of the fluid. Under consideration is a real section of the Yenisei-Khatanga basin, northwest of the Siberian Platform. Two types of models were used: (1) intrusion of a sill into the basement of the basin, beneath a reservoir bed, and between two reservoirs; (2) the same situations but with a vertical dike and off-branching sill. Some numerical experiments were carried out to study the effect exerted on convection by pore fluid of a single sill or a dike combined with sill that are intruded into the sediment. The calculated results permit prediction of the beginning of convection depending on type of intrusion, its location in the section of sedimentary basin, initial temperature, and physical parameters of rocks. Patterns of evolution of temperature field and velocities of fluid flows in the sediment around solidifying intrusions have been obtained. The problem is important for predicting the behavior of both water and hydrocarbon fluids in basins where trap magmatism is expressed.