Abstract:

Light hydrocarbon geochemical field is one of the manifestations of hydrocarbon.Geochemical field is composed of field source and field effect.The field source is the material base of light hydrocarbon remigration;the field effect, which is effected by the solubility of formation water and country rock property,is the interaction of light hydrocarbons and soil substrate.During migration,light hydrocarbors possess the behaviour of dynamical equilibrium and divergence,the migration direction is determined by the contrast between passages and resistance.It is suggested that,in geochemical exploration,one should not only consider the property of field source,but also the preservation state,the composition and contents of light hydrocarbons,and carry out comprehensive analysis in time-space.

Key words: Light hydrocarbon, geochemical field, field source, field force, field effect