water migration
2.On calculating the frost heave, the water migration content is determined by the relationship between the water influx content and the time, the original water frost displacement is determined by the relationship between the unfrozen water content and the temperature, thus, the emigrant and original water frost displacement is calculated by the thermal stress computing program of MARC in which the volume expantion coefficient induced by freezing is considered as negative thermal expansion coefficient;
3.This paper reveals the theory of the freezing imrove-ment used in the soft soil tunnel. Besides the freezing process increases the strength of the original soil directly, the water migration and soil consolidation of the unfrozen soil in the lower temperature area abutting the frozen soil play a important role in improving the stabili-ty of the shield excavation face.
8.The sedimentary water is the carrier and main driving force of petroleum migration and accumulation, which controls the fluid movement and appears centrifugal flow from the center to edge of basin, while penetrated water formed by infiltration of atmospheric precipitation and surface water appears centripetal flow from the edge to center of basin by gravity process.
10.In finding the rules of hydrocarbon accumulation in a basin,it is necessary to study systematically the organic geo-chemical characteristics and reservoir characteristics of reservoir fluid series (natural gas,crude oil,asphalt and organic matters in water) carried by the information concerning hydrocarbon generation,migration and accumulation,evolution and oxidation,destroy and preservation, etc.
