轻烃地球化学场的形成和特征

FORMATION AND CHARACTERISTICS OF LIGHT HYDROCARBON GEOCHEMICAL FIELDS

李广之

Li Guangzhi

轻烃地球化学场是油气藏地球化学场的一种表现形式,由场源和场作用构成。场源是轻烃进行运移的物质基础,场作用则是轻烃与环境介质的各种反应,主要受地层水溶解度和围岩性质的影响。轻烃在运移过程中具有动态平衡和分异效应的特点,其运移方向取决于运移通道和运移阻力的对比。因此,在进行地球化学勘探时,不仅要考虑场源的性质,而且更应注意轻烃的赋存状态、组成及含量,在时空上进行综合分析。

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.

10.11743/ogg19990115