Rheological aspects of underground fluid dynamics and mass exchange processes

摘要

Mechanics of porous media has theoretical basis provided by scientific disciplines such as rock mechanics, soil physics and so on. In the current knowledge, some complex processes in the geo-systems lack full theoretical description. The example of such processes is metamorphosis of rocks, filtration process in swelling soils, earthquakes and correspondent variations of stress-strain state. Chemical transformation of solid and fluid components, heat release and absorption, phase transitions, rock destruction occurs in such processes. Extensive use of computational resources in scope of traditional models of the mechanics of porous media cannot guarantee full accuracy of obtained models and results. In this work complete description of processes of mass exchange between fluid and poly-mineral materials in porous media from various kinds of rocks (primarily sedimentary rocks) have been examined. It was shown that in some important cases there is a storage equation of non-linear diffusion equation type. In addition, process of filtration in non-swelling soils, swelling porous rocks and coupled process of consolidation and chemical interaction between fluid and granulated materials are considered. In the latter case equations of physical-chemical mechanics of conservation of mass for fluid and granulated material are used. Rheological properties of different kinds of rocks are described.