塔里木盆地S74井稠油热模拟实验研究(一)——模拟产物地球化学特征

对塔里木盆地S74井稠油开展了热模拟实验,对原油、模拟残渣抽提物、排出油的族组分及其碳同位素进行了测试,并对饱和烃进行了气相色谱与气相色谱—质谱分析,同时进行了烷烃气碳同位素分析。研究表明:1)模拟残渣抽提物饱和烃结构组成、甾萜烷生物标志化合物随模拟温度的变化具较大幅度的变化,而排出油除在350℃出现异常外,饱和烃结构组成、甾萜烷生标特征随模拟温度的变化不大;2)模拟残渣抽提物及其馏分碳同位素随模拟温度的增高而逐渐变重,而排出油及其馏分碳同位素随模拟温度的变化规律不明显;3)烷烃气碳同位素随模拟温度的增高而逐渐变重,各模拟温度点烷烃气碳同位素呈正常组合序列分布。 

THERMAL SIMULATION STUDY OF CRUDE OIL FROM WELL S74 IN THE TARIM BASIN(Ⅰ)-GEOCHEMICAL CHARACTERISTICS OF THE SIMULATION PRODUCTS

A thermal simulation experiment of the heavy crude oil from Well S74 in the Tarim Basin has been conducted.The hydrocarbon families and the isotopes of the crude oil,the residual extract and the expelled oil have been analyzed.The saturated hydrocarbons have been detected by gas chromatography and gas chromatography-mass spectrometry,and the carbon isotope analysis of the alkane gases has been carried out.The results indicate that: 1) The compositional structure of the saturated hydrocarbons and the biomarkers of sterane and terpane of the residual extract change significantly with the increase of the simulation temperature,whereas the compositional structure of the saturated hydrocarbons and the biomarkers of sterane and terpane of the expelled oil do not change so significantly with the simulation temperature,except at 350 ℃ where anomalies occur.2) The carbon isotopes of the residual extract and its fractions increase gradually with the simulation temperature,whereas those of the expelled oil do not change so regularly with the simulation temperature.3) The carbon isotopes of the alkane gases also increase gradually with the simulation temperature,and the carbon isotope values at various simulation temperature points distribute as the normal sequence.