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应用烃类包裹体偏光-荧光镜下特征、盐水包裹体均一温度及油包裹体红外光谱特征,研究塔里木盆地哈拉哈塘凹陷奥陶系油藏成藏流体特征及演化历史.实验结果表明:油藏主要经历2期成藏,早、晚两期包裹体均一温度峰值分别在为72.5～78.5℃和92.1～99.7℃;油包裹体红外光谱实验再次表明,油包裹体内普遍含有水;还发现原生包裹体水/油相比值较大(4.6～2.1),烃类成熟度参数较低(CH2/CH3比值为7.3～4.5);次生包裹体水/油比值较小(1.1～0.4),烃类成熟度较高(CH2/CH3比值为2.9～1.9);原生包裹体普遍含有硫醇类化合物,而次生包裹体几乎不含有.对比奥陶系原油地球化学特征发现,含硫醇类化合物为油藏早海西期生物降解作用形成,海西晚期较高成熟度原油的大量充注,使硫醇类化合物含量不断降低,同时部分硫醇类化合物开始发生裂解生成少量H2S.
The characteristics of hydrocarbon accumulation fluid and evolution history of Ordovician reservoirs in Halahatang sag, Tarim Basin, are studied by using the characteristics of polarization-fluorescence microscopy of hydrocarbon inclusions, the homogenization temperature of brine inclusions and the infrared spectra of oil inclusions.The experimental results show that: The reservoirs mainly experienced two stages of hydrocarbon accumulation. The homogenization temperature of early and late phase inclusions were 72.5-78.5 ℃ and 92.1-99.7 ℃, respectively. Infrared spectra of oil inclusions again showed that oil inclusions generally contained water. The water / oil ratios of the primary inclusions were relatively large (4.6-2.1), and the hydrocarbon maturity parameters were lower (the ratio of CH2 / CH3 was 7.3-4.5). The water / oil ratio of the secondary inclusions was small (1.1-0.4) Hydrocarbons are more mature (CH2 / CH3 ratio of 2.9 ~ 1.9); primary inclusions generally contain thiols, while secondary inclusions contain almost no comparison of Ordovician oil geochemical characteristics found that thiols The compounds are formed in the early Hercynian period of the reservoir, and the heavy charge of the higher mature crude oil in the late Hercynian phase leads to the continuous decrease of the thiol compounds. At the same time, some thiols begin to crack and generate a small amount of H2S.