Gas-condensate migration and oil fractionation in deltaic systems
Gas-condensate migration and oil fractionation in deltaic systems
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DOI：
10.1016/0264-8172(88)90004-9
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发表时间：
1988-08
影响因子：
4.2
通讯作者：
K. Thompson
中科院分区：
文献类型：
--
作者：
K. Thompson
本文提出用热蒸发分馏来描述原油二次蚀变过程中的几种现象。第一，石油在储层中经常部分蒸发;第二，含有大部分溶解石油的天然气沿沿着流动，形成独立的凝析气聚集;第三，以这种方式形成的残余油具有分馏的内在证据。除轻馏分的明显损失外，渣油中相对于链烷烃的轻芳烃和环烷烃含量增加。蒸发分馏效应首次在美国矿务局常规方法油分析的蒸馏和物理性质数据中得到确认。分馏效应被假定为S形的原因，而不是正常的，曲线的，芳香的配置文件。蒸发分馏的影响在整个美国的油中广泛存在。它们在墨西哥湾沿岸地区约75%的石油和大部分的天然气凝析油中很明显。这一过程是石油蚀变和气体凝析油生成的一种主要手段，但显然未被认识到。实验证据表明，部分汽化导致残余油中轻质芳烃含量增加。在升高的压力和温度下，将油样在过量甲烷中部分蒸发，然后除去蒸气。再现了许多墨西哥湾沿岸石油的气相色谱特征。不同程度的轻馏分消耗和芳香性的增强。
The termevaporative fractionationis proposed to describe several phenomena involved in the secondary alteration of reservoired oil. Firstly, it is suggested that oil is frequently partially vaporized in the reservoir; secondly, that gas, bearing substantial portions of the oil in solution, is conducted along faults to form independent gas-condensate accumulations; thirdly, that residual oils formed in this fashion bear internal evidence of fractionation. In addition to the conspicuous loss of light ends, there is an increase in the content of light aromatic and naphthenic hydrocarbons relative to paraffins in the residual oil. Evaporative fractionation effects are recognized for the first time in the distillation and physical property data of US Bureau of Mines Routine Method Oil Analyses. Fractionation effects are postulated to be the cause of sigmoid, as opposed to normal, curvilinear, aromatic profiles. The effects of evaporative fractionation are widespread in oils throughout the United States. They are evident in approximately 75% of oils in the Gulf Coast region, and in a large proportion of the gas-condensate accumulations. The process is a major, and apparently unrecognized, means of petroleum alteration, and of generation of gas-condensates.Experimental evidence shows that partial vaporization results in enhanced levels of light aromatic hydrocarbons in residual oils. Oil samples were partially vaporized in excess methane at elevated pressure and temperature, followed by removal of the vapour. The gas-chromatographic features of many Gulf Coast oils were reproduced. Various levels of light-end depletion and enhancement of aromaticity were brought about.