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采用高温模拟技术,对原油、氯仿沥青“A”、烃源岩、干酪根和原油族组分样品进行热模拟实验,分析不同样品在裂解过程中产物碳同位素组成的变化特征,研究其地球化学意义。原油、氯仿沥青“A”、干酪根、烃源岩和饱和原油族组分随热演化温度的增加,热模拟气态烃碳同位素演化规律是由重变轻再变重的演化趋势,700℃以前碳同位素分布呈正碳同位素系列分布,750℃以后出现丙烷碳同位素倒转,芳烃馏分和沥青质馏分的碳同位素值和正碳同位素系列分布出现差异;各样品随热模拟温度的增加,Δδ13C2-1值都呈增大的趋势;Δδ13C3-1、Δδ13C3-2对原油、氯仿沥青“A”、饱和烃馏分与芳烃馏分和沥青质馏分随模拟温度的变化有差异;δ13C2-δ13C3值和LN(C2/C3)值随模拟温度的增加呈正相关性。
The thermal simulation of crude oil, chloroform bitumen “A ”, source rock, kerogen and crude oil components was carried out by using high temperature simulation technique to analyze the variation characteristics of carbon isotope composition of different samples during the cracking process, Geochemical significance. Crude oil, chloroform bitumen “A ”, kerogen, source rock and saturated oil family components with the thermal evolution temperature increase, thermal simulation of gaseous hydrocarbon carbon isotope evolution from heavy to light again heavy weight evolution trend, 700 ℃ before carbon isotope distribution was positive carbon isotope distribution, after 750 ℃ carbon isotope inversion propane hydrocarbon, aromatic fraction and asphaltene fraction carbon isotope values and positive carbon isotopic series distribution differences; each sample with the heat simulation temperature increases, Δδ13C2-1 Value of δ13C3-1 and Δδ13C3-2 are different with the change of simulated temperature for the crude oil, chloroform bitumen “A ”, saturated hydrocarbon fraction, aromatic fraction and asphaltene fraction; the value of δ13C2-δ13C3 and LN (C2 / C3) values positively correlated with the increase of simulated temperature.