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随烃类横向运移路程的增加,石油的含气量减少,这是石油中的轻组分在地层中扩散的结果。孔壁吸附烃类也导致石油含气量的减少。石油的重组分——胶质和沥青质极易被吸附,而气体组分被吸附的就少得多。如实验结果表明,当丙烷滤过岩石时,部分地凝结在岩石的颗粒表面。苏联《石油与天然气地质》杂志1977年第3期41—44页中对天然气在岩石细小孔隙中的吸附能力作了阐述。甲烷是天然气各组分中吸附力最小的,所以,石油在横向运移中,其伴生气中的甲烷含量将增高,而石油中所含天然气总
As hydrocarbon lateral migration increases, the gas content of the oil decreases, as a result of the diffusion of the light components in the oil in the formation. Hole wall adsorption of hydrocarbons also led to the reduction of oil gas content. Heavy fractions of petroleum - gums and asphaltenes - can be easily adsorbed, while the gas components are much less adsorbed. As experimental results show, when propane is filtered through the rock, it partially condenses on the particle surface of the rock. The adsorption capacity of natural gas in fine pores of rock is expounded in Soviet Union’s “Oil and Gas Geology”, No. 3, 1977, pp. 41-44. Methane is the least adsorptive component of natural gas. Therefore, the horizontal shift of oil will increase the methane content of its accompanying gas, while the total amount of natural gas contained in oil