Through microscopic analyses(e.g.,organic macerals,thin section observation,scanning electron microscope(SEM)imaging of fresh bedding planes via argon ion milling,and energy spectrum tests)combined with Rock-Eval anal...Through microscopic analyses(e.g.,organic macerals,thin section observation,scanning electron microscope(SEM)imaging of fresh bedding planes via argon ion milling,and energy spectrum tests)combined with Rock-Eval analyses,this study systematically investigated the organic matter and pyrites in the continental shales in the 3^(rd)submember of the Chang 7 Member(Chang 7^(3)submember)in the Yanchang Formation,Ordos Basin and determined their types and the formation and evolutionary characteristics.The results are as follows.The organic matter of the continental shales in the Chang 7^(3)submember is dominated by amorphous bituminites and migrabitumens,which have come into being since the early diagenetic stage and middle diagenetic stage A,respectively.The formation and transformation of organic matter is a prerequisite for the formation of pyrites.The Ordos Basin was a continental freshwater lacustrine basin and lacked sulphates in waters during the deposition of the Chang 7 Member.Therefore,the syndiagenetic stage did not witness the formation of large quantities of pyrites.Since the basin entered early diagenetic stage A,large quantities of sulfur ions were released as the primary organic matter got converted into bituminites and,accordingly,pyrites started to form.However,this stage featured poorer fluid and spatial conditions compared with the syndepositional stage due to withdraw of water,the partial formation of bituminites,and a certain degree of compaction.As a result,large quantities of pyrrhotite failed to transition into typical spherical framboidal pyrites but grew into euhedral monocrystal aggregates.In addition,pyrites are still visible in the migrabitumens in both microfractures and inorganic pores of mudstones and shales,indicating that the pyrite formation period can extend until the middle diagenetic stage A.展开更多
介绍了某炼油厂利用15万t·a^(-1)柴油加氢精制装置试生产3^(#)喷气燃料的具体实施过程,通过对原料油馏程、操作参数的调整,采取降低反应温度、反应压力及分馏塔温度等一系列措施,以常减压装置常一线油为原料,成功生产出3^(#)喷气...介绍了某炼油厂利用15万t·a^(-1)柴油加氢精制装置试生产3^(#)喷气燃料的具体实施过程,通过对原料油馏程、操作参数的调整,采取降低反应温度、反应压力及分馏塔温度等一系列措施,以常减压装置常一线油为原料,成功生产出3^(#)喷气燃料。实践发现,140~255℃常一线馏分是生产3^(#)喷气燃料的适宜原料,操作参数相较于生产柴油时偏低,将反应压力从3500 k Pa降低至3200 k Pa,3^(#)喷气燃料的芳烃体积分数由7.33%上升至9.27%,满足大于体积分数8.50%的内控指标要求。3^(#)喷气燃料试生产的成功,证明柴油加氢精制装置具备在线切换生产柴油和3^(#)喷气燃料产品的能力,有效提升装置的经济效益和社会效益,对柴油加氢精制装置的产品转型提供了良好的工业范例。展开更多
基金funded by the subproject of the National Science and Technology Major Project(No.2017ZX05036004).
文摘Through microscopic analyses(e.g.,organic macerals,thin section observation,scanning electron microscope(SEM)imaging of fresh bedding planes via argon ion milling,and energy spectrum tests)combined with Rock-Eval analyses,this study systematically investigated the organic matter and pyrites in the continental shales in the 3^(rd)submember of the Chang 7 Member(Chang 7^(3)submember)in the Yanchang Formation,Ordos Basin and determined their types and the formation and evolutionary characteristics.The results are as follows.The organic matter of the continental shales in the Chang 7^(3)submember is dominated by amorphous bituminites and migrabitumens,which have come into being since the early diagenetic stage and middle diagenetic stage A,respectively.The formation and transformation of organic matter is a prerequisite for the formation of pyrites.The Ordos Basin was a continental freshwater lacustrine basin and lacked sulphates in waters during the deposition of the Chang 7 Member.Therefore,the syndiagenetic stage did not witness the formation of large quantities of pyrites.Since the basin entered early diagenetic stage A,large quantities of sulfur ions were released as the primary organic matter got converted into bituminites and,accordingly,pyrites started to form.However,this stage featured poorer fluid and spatial conditions compared with the syndepositional stage due to withdraw of water,the partial formation of bituminites,and a certain degree of compaction.As a result,large quantities of pyrrhotite failed to transition into typical spherical framboidal pyrites but grew into euhedral monocrystal aggregates.In addition,pyrites are still visible in the migrabitumens in both microfractures and inorganic pores of mudstones and shales,indicating that the pyrite formation period can extend until the middle diagenetic stage A.
文摘介绍了某炼油厂利用15万t·a^(-1)柴油加氢精制装置试生产3^(#)喷气燃料的具体实施过程,通过对原料油馏程、操作参数的调整,采取降低反应温度、反应压力及分馏塔温度等一系列措施,以常减压装置常一线油为原料,成功生产出3^(#)喷气燃料。实践发现,140~255℃常一线馏分是生产3^(#)喷气燃料的适宜原料,操作参数相较于生产柴油时偏低,将反应压力从3500 k Pa降低至3200 k Pa,3^(#)喷气燃料的芳烃体积分数由7.33%上升至9.27%,满足大于体积分数8.50%的内控指标要求。3^(#)喷气燃料试生产的成功,证明柴油加氢精制装置具备在线切换生产柴油和3^(#)喷气燃料产品的能力,有效提升装置的经济效益和社会效益,对柴油加氢精制装置的产品转型提供了良好的工业范例。
