有机烃类和油气田的通用定量模型

General Quantitative Model for Organic Hydrocarbons and Oil-Gas Fields

提出了液态烃和气态烃与生烃母岩关系的基本定量模型,地层中的液态烃和气态烃在沉降的不同阶段、烃类运移阶段以及成藏阶段,当温压条件发生变化时是相互影响的。根据原始有机质成因类型(腐泥质、腐殖质和腐泥-腐殖质),以及深部温压条件对烃类相态的影响,确定了天然气—凝析气—石油从开始生成(原生后生阶段)到变后生阶段这一系统中的定量变化。PVT所取烃类样品的系统计算表明,在有机质不同的后生演化阶段,液态烃和气态烃的体积比是很有特点的。因而也确定了地层条件下烃类系统的定量指标——天然气饱和度,原油体积分量以及地面标准条件下相应烃类的相态组分。

This paper presents a principal quantitative model for relation of liquid and gaseous HC generated by oil source rock interacting under formation conditions while changing thermobaric condtions at the stages of dipping as well as in process of HC migration and pools formation. Based on the assumption about the governing effect of genetic type of original OM （sapropel, humas, combined） and thermobaric conditions in the subsurface on the phase state of generated HC, the author has established quantitative changes in the system gas-gascond- ensate-oil from the start of generation （stage of protocatagenesis） up to apocatagenesis, the systemiatic calculations obtained in studying HC samples at apparatus PVT characterize the volumetric relations of liquid and gaseous HG at different degree of catagentic trasformation of OM. As a result it was established a quantitative characteristic of HC system under formation condtions-- gas saturation, volume of oil as well as corresponding phase composition of HC in standard conditions on the surface.