Main factors influencing the expulsion of oil derived from coal zz:ZHAO Changyi; CHENG Keming

摘要

THE expulsion of hydrocarbons from coal is controlled by two main factors. The first is the properties inherited from coal itself and contains two implications. One is original potential of hydrocarbon generation from coal, which determines the degreeof oil-bearing saturability; the other is the molecular arranging framework and surface character of molecular particles of coal, which determine the reservoir space and flowing property of hydrocarbons. The second is an external geological agent, whichis necessary for the expulsion of hydrocarbon from coal. Appropriately tectono-compressive stress and conveying beds cutting through coal seams, such as fault, bedding and denudation plane, are the external conditions for the expulsion and migration ofhydrocarbons. The above two factors are indispensable. The expulsion of oil derived from coal in the Tuha Basin is controlled by both internal attributes of coals and the external tectonic-compressive stress.