西加拿大盆地2WS组页岩地球化学与页岩油储层微观特征

发布时间：2018-04-30 13:12

本文选题：西加拿大盆地 + 2WS组　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：通过对9口井岩心样品岩石热解、X射线衍射分析、氩离子抛光-扫描电子显微镜分析、氮气等温吸附及可溶有机质的色谱-质谱分析,探讨了西加拿大盆地第二白斑组(2WS)富有机质页岩的地球化学以及页岩油储层微观孔隙结构特征。结果表明:饱和烃色谱质谱分析显示烃类以短链正构烷烃(n-C9—n-C19)为主,ααα20RC27规则甾烷占优势,奥利烷相对含量较低,有机质以藻类、浮游生物为主。Pr/Ph受成熟度影响比较小,基本记录了沉积阶段及成岩作用早期的氧化还原环境。二苯并噻吩/菲与姥鲛烷/植烷关系显示2WS组沉积环境-岩相东西方向上存在较大变化,在阿尔伯塔东部为强还原环境,中西部为弱还原环境,在西部还原性增强。另一方面,由于所有实验室热解产物通常含有大量的极性、高分子化合物,使得把惰性碳算在内的质量平衡模型高估烃源岩的生烃潜量。针对此问题,应用死碳矫正新方法对2WS组成熟—高成熟烃源岩原始有机碳含量、原始生烃潜量进行恢复。对2WS组页岩油储层微观孔隙结构特征研究结果显示,页岩内主体孔隙以中孔为主,发育少量微孔和大孔。孔隙类型多样,主要包括粘土矿物晶间孔、有机质粒内孔、微裂缝、次生溶蚀孔(黄铁矿)、晶间孔5类孔隙,它们为页岩油提供了主要存储空间。粘土矿物、石英、黄铁矿含量、有机质丰度及其成熟度、沥青含量是影响页岩油储层孔隙特征的主要因素,其中粘土矿物、石英有利于储层孔隙的发育;黄铁矿对大型孔隙贡献比较大,但总体上不利于孔隙发育;沥青质和方解石的大量存在会堵塞微孔吼道,降低储层孔隙空间。
[Abstract]:Through the rock pyrolysis of core samples in 9 wells, X ray diffraction analysis, argon ion polishing scanning electron microscope analysis, nitrogen isothermal adsorption and soluble organic matter chromatography-mass spectrometry analysis, the geochemical characteristics of the rich shale in the second white spot group (2WS) in the western Canada Basin and the microscopic pore structure characteristics of shale oil reservoirs are discussed. The analysis of saturated hydrocarbon gas chromatography-mass spectrometry (GC MS) shows that hydrocarbons are dominated by short chain n-alkanes (n-C9 - n-C19), alpha alpha 20RC27 regular sterane is dominant, the relative content of olrianes is low, organic matter with algae and plankton as the main.Pr/Ph is less affected by maturity, which basically records the oxidation and reduction environment at the sedimentary stage and early diagenesis. Two benzo The relationship between thiophene / phenanthrene and pristane / alkanes shows that the sedimentary environment of the 2WS group has great changes in the east-west direction of the lithofacies, the strong reduction environment in the eastern part of Alberta, the weak reduction environment in the Midwest and the reduction in the western region. On the other hand, because all the laboratory pyrolysis products usually contain a large number of polarity, high polymer compounds, make laziness. The mass balance model, including the carbon calculation, overestimates the hydrocarbon generation potential of the source rocks. In order to solve this problem, the dead carbon Jiao Zhengxin method is used to restore the original organic carbon content and the original hydrocarbon potential of the mature and highly mature source rocks of 2WS group. The microscopic pore structure characteristics of the shale oil reservoir in group 2WS show that the main pores in the shale are in the mesopore. There are a small number of micropores and large pores. The pore types are varied, mainly including intergranular pores of clay minerals, organic plasmids, microcracks, secondary dissolution pores (Pyrite) and intergranular pores, which provide 5 kinds of pores. They provide the main storage space for shale oil. Clay minerals, quartz, Huang Tie ore content, organic matter abundance and maturity, asphalt content is the influence page. The main factors of pore characteristics of rock and oil reservoirs, in which clay minerals and quartz are beneficial to the development of reservoir pores, the contribution of pyrite to large pores is relatively large, but in general it is not conducive to pore development, and a large number of asphaltenes and calcite will clog the micropore roar and reduce the space space of the reservoir.

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;TE311

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