Abstract: The giant Ordovician buried hill in Lunnan area was characterized by wholly oil-bearing and locally enriched oil. It is difficult to be explored because of the high heterogeneity of carbonate reservoirs and the complexity of fluid in the weathering crust. The key factors for hydrocarbon accumulation including source rocks, reservoirs and oil-gas migration systems were systematically researched by the new theories and methods in petroleum geology, geophysics and organic geochemistry. Furthermore, according to the tectonic evolution of the buried hill and multi-period accumulation of oil and gas, a hydrocarbon accumulation model for the giant buried hill in Lunnan area was proposed. This model has played a guiding role in finding and proving the giant oil field in the Lunnan buried hill. The proved reserve in this field is more than 600 million tons.

Key words: Lunnan area, Ordovician System, buried hill, source rock, carbonate reservoir, migration system, hydrocarbon accumulation model

摘要： 轮南奥陶系大型古潜山具有整体含油、局部富集的特点,但由于风化壳碳酸盐岩储集体非均质性极强,流体十分复杂,油气藏类型特殊,勘探难度很大。利用石油地质、地球物理、有机地球化学理论和方法,研究了该区潜山烃源岩、储集体、输导体系等成藏关键事件,并从潜山构造演化和多期成藏的角度提出了轮南大型古潜山的油气成藏模式。该模式应用于轮南潜山,发现了储量超6×10⁸t特大型油气田。

关键词: 轮南地区, 奥陶系, 古潜山, 烃源岩, 碳酸盐岩储集体, 输导体系, 油气成藏模式