键合态生物标志化合物受热成熟作用的影响及其在贵阳倪儿关地区与剑河地区烃源对比中的应用

发布时间：2018-02-15 12:52

本文关键词： 催化加氢热解人工熟化实验油源对比倪儿关剑河　出处：《中国科学院研究生院(广州地球化学研究所)》2015年博士论文　论文类型：学位论文

【摘要】：催化加氢热解技术所释放的键合态生物标志化合物具有产率高、重排异构化程度低特征,得到了广泛的应用。但热成熟作用对催化加氢热解法从干酪根上提取的键合态生物标志化合物特征的影响还没有深入研究。为此,本研究人工熟化了不同类型的低熟烃源岩样品,再对其进行干酪根催化加氢热解实验,比较不同成熟度样品的抽提物和干酪根催化加氢热解产物的差别,并与前人对不同成熟度的固体沥青及天然地质样品的研究资料进行对比,研究结果表明,大量键合态甾萜烷化合物等烃类在350°C之前(Ro小于1.0%)均已排出;但在350°C-480°C阶段(Ro为1.0-2.4%之间),干酪根中的键合态甾萜烷生源参数比值均较为稳定,受到热成熟作用的影响较小;而键合态与游离态甾萜烷热成熟度参数比值均趋近于平衡值,均不宜用于热成熟度的评价。基于以上研究结果,将催化加氢热解法运用到贵阳倪儿关地区下三叠统大冶组油苗/源岩及剑河地区中寒武统石冷水组油苗/源岩的对比研究中。倪儿关地区下寒武统烃源岩处于高-过成熟阶段而其它潜在烃源岩仍处于生油窗内,作为储层的下三叠统大冶组泥灰岩自身也具有一定的生烃能力,还有这些油苗还受到了生物降解作用的强烈改造。为了减少强烈的热成熟作用和生物降解作用对油源对比的干扰,本文采取催化加氢热解实验从处于过成熟阶段的下寒武统牛蹄塘组泥岩干酪根中提取出键合态生物标志物;从下三叠统大冶组泥灰岩中依次提取出了氯仿沥青“A”、氯仿沥青“C”;并进行了大冶组烃源的干酪根热解。其油源对比结果表明,下三叠统大冶组油苗主要源自下寒武统烃源岩,同时混合了部分下三叠统大冶组泥灰岩的贡献。与麻江-凯里古油藏相邻的剑河地区发育中寒武统石冷水组油苗,这些油苗遭受了严重的生物降解作用。前人均认为这些油苗来源于下寒武统泥质烃源岩,但剑河地区还发育有处于高-过成熟阶段的上震旦统陡山沱组泥质烃源岩。为了减少热成熟作用和生物降解作用对油源对比的干扰,本文采取催化加氢热解技术释放上震旦统-下寒武统泥质烃源岩干酪根中的键合态生物标志物,并与麻江-凯里地区烃源岩样品和油苗进行了对比研究。其研究结果表明,石冷水组油苗为生物降解油与未生物降解油的混合物,来源于上震旦统-下寒武统泥质烃源岩。
[Abstract]:The bond biomarkers released by catalytic hydropyrolysis have the characteristics of high yield and low degree of rearrangement isomerization. However, the effect of thermal maturation on the characteristics of bonded biomarkers extracted from kerogen by catalytic hydropyrolysis has not been thoroughly studied. In this study, different types of low-mature source rock samples were artificially aged, and then the kerogen catalytic hydropyrolysis experiments were carried out to compare the difference between the extracts of different maturity samples and the products of kerogen catalytic hydropyrolysis. Compared with the previous studies on solid asphalt and natural geological samples with different maturity, the results show that a large number of bonded steroterpene compounds and other hydrocarbons have been discharged before 350 掳C (Ro < 1.0). However, at 350 掳C-480 掳C, the ratio of Ro is between 1.0-2.4%, the ratio of the source parameters of bonded steroterpenes in kerogen is stable, and it is less affected by thermal maturation, while the ratio of thermal maturity parameters of bonded and free steroterpenes approaches the equilibrium value. Based on the above results, The catalytic hydropyrolysis method was applied to the comparative study of oil Miao / source rock of Lower Triassic Daye formation in Nierguan area of Guiyang and oil seedling / source rock of Middle Cambrian Stone Cold Water formation in Jianhe area. Lower Cambrian source rock is high in Nierguan area. -over maturation while other potential source rocks are still in the oil generation window, The Lower Triassic marl of Daye formation, which is a reservoir, also has certain hydrocarbon generating ability. These seedlings have also been strongly modified by biodegradation. In order to reduce the interference of intense thermal maturation and biodegradation on oil source correlation, In this paper, the binding biomarkers were extracted from the kerogen of mudstone of Niulitang formation in the lower Cambrian by catalytic hydropyrolysis experiment. Chloroform bitumen "A" and chloroform asphalt "C" were extracted from the Lower Triassic mudstone of Daye formation, and the kerogen pyrolysis of the hydrocarbon source of Daye formation was carried out. The oil source comparison results show that the oil seedlings of the Lower Triassic Daye formation are mainly derived from the Lower Cambrian source rocks. At the same time, the contribution of mudstone from the Lower Triassic Daye formation is mixed. The Jianhe area adjacent to the Majiang-Kaili paleoreservoir has developed oil seedlings of the Meso-Cambrian Shi-Cold Water formation. These oil plantlets have been subjected to severe biodegradation. It is believed that these oil seedlings originated from the lower Cambrian shaly source rocks. However, shaly source rocks of the Doushantuo formation of the Upper Sinian are also developed in Jianhe area. In order to reduce the interference of thermal maturation and biodegradation on oil source correlation, In this paper, the catalytic hydropyrolysis technique was used to release the bonded biomarkers from kerogen of the Upper Sinian and Lower Cambrian muddy source rocks, and the results were compared with those of the source rock samples and oil seedlings in the Majiang-Kaili area. The oil seedling of the Shijiangformation is a mixture of biodegradable oil and non-biodegradable oil, which is derived from the shaly source rocks of the Upper Sinian and Lower Cambrian.
【学位授予单位】：中国科学院研究生院(广州地球化学研究所)
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE62

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