摘要
断块油田由于断裂输导体系丰富,原油往往来自于多个生烃凹陷或多套烃源岩,从而使得成熟度不同的油性混杂。这不仅造成原油归类难度大,而且使原油成熟度评价困难,因此需要使用比往常更多指标进行了综合分析。此次选取了断裂体系丰富的断阶带上的多个油田,使用原油碳同位素、族组分、异构烷烃,以及很多非常规的甾类和萜类化合物指标,对多层位多区域的原油进行了归类,并对原油成熟度评估。测试发现原油的δ^(13)C在Es3层段较高,Es1较低,Ed最低。从族组分上看,饱和烃比例最大,即以优质原油为主。通过各类标志物分析可将原油可分3类,Ⅰ类油δ13C较轻,Pr占优势,Ts/Tm值约1.9,C_(27)、C_(28)、C_(29)甾烷呈L或V型,属于成熟油,来自Es3段生烃母质;Ⅱ类油δ^(13)C也较轻,Pr含量比Ph高,Ts/Tm小于1.0,甾烷呈V型或倒L型,来自Es1下段生烃母质,综合评价部分属于成熟原油,部分属于低成熟重质油;Ⅲ类油则为性质介于两者之间的混合型原油,总体评价为高成熟度优质原油。
In a fault block oil field with many pathways of fractures, crude oil is usually derived from multiple hydrocarbon sags or many oil-source layers, which results in mixed oils of different maturities. Therefore, characteristic description and classification of crude oil are difficult, and the maturity and quality of oil is not easy to be evaluated. In order to solve these problems, more indicators and parameters are found and used. In this paper, by using carbon isotopes, group compositions, isomeric alkanes, steranes and terpenes compounds, and corresponding analysis plots, the characteristics of crude oil were analyzed and classified, and the maturity was evaluated. The results show that the carbon isotopes of oil in Es3 layer are higher, that in lower Es1 is lower, and that in Ed is the lowest. As for group compositions, the saturated hydrocarbon content is high. Through comprehensive analysis of biomarkers, the crude oil can be classified into three classes. Type I oil is derived from Es3 oil-source rock and its carbon isotopic range is wide. Its Pr is dominant; Ts/Tm is around 1.9; C_（27）, C_（28） and C_（29） sterane is L or V shape, which is generally evaluated as matured oil. Type Ⅱ oil is mainly from Es1 hydrocarbon source rocks; its carbon isotope is low; Pr is dominant; Ts/Tm1.0 and sterane type is V or inverted L type; comprehensive evaluation shows that the oil type is partly matured light oil, partly low-matured heavy oil. Parameters of type Ⅲ oil are between them. It is overall evaluated as high-matured high-quality light oil.
出处
《当代化工》
CAS
2016年第4期742-745,共4页
Contemporary Chemical Industry
基金
国家油气专项
项目号2011ZX05011
关键词
原油类型
族组分
萜烷
甾烷
成熟度评价
Oil type
Group compositions
Terpenoids
Steroids
Oil maturity evaluation
作者简介
吴兆徽（1985-），男，山东省菏泽市人，博士生，2007年毕业于中国石油大学（华东）资源勘查工程专业，2010年毕业于中国石油大学（华东）矿产普查与勘探专业，目前主要从事油藏地质和开发方面科研工作。E-mail：325117168@qq．com。
