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轮西地区奥陶系溶缝洞型潜山油藏中的原油以重油为主,为源自中、下寒武统烃源岩和中、下奥陶统烃源岩的混合油,经历了以侧向运移和聚集为主的加里东晚期—早海西期油气聚集和破坏,即有沿断裂向上调整又有侧向运移和聚集的海西晚期油气聚集并在海西末期降解形成重油的成藏过程.轮西地区奥陶系潜山油藏不存在燕山晚期—喜山期油气充注,却受该期深部轻质油气扩散的影响,表现为重油与原油裂解形成的干燥系数为0.91~0.96的溶解气伴生.通过对该地区奥陶系潜山成藏过程的研究,对塔里木盆地克拉通地区早期充注形成的油气藏的勘探潜力的认识具有重要的意义.
The crude oil in the Ordovician dissolution fractured-hole buried hill reservoirs in the western part of the western wheel is dominated by heavy oil and is a mixture of oil derived from middle and lower Cambrian source rocks and middle and lower Ordovician source rocks. Early Late Caledonian-Early Hercynian hydrocarbon accumulation and destruction dominated by lateral migration and accumulation, that is, late Hercynian hydrocarbon accumulation following the uplift and lateral migration and accumulation of faults and the formation of late Hercynian Heavy oil accumulation process.The Ordovician buried hill reservoirs in the western part of Tibet do not exist in the Late Yanshanian-Himalayan period but are affected by the deep light oil and gas diffusion during this period, which is characterized by the drying coefficient of heavy oil and crude oil cracking Which is associated with the dissolved gas of 0.91 ~ 0.96.The study of the Ordovician buried hill formation in the area is of great significance to the exploration potential of the early filling of oil and gas reservoirs in the Craton area in the Tarim Basin.