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目前的观点认为腐泥型于酪根来源的凝析油均是成岩作用晚期有机质高成熟阶段(R_0>1.3%)或早期大分子烃类热裂解的产物;近来的研究表明,原油蒸发分馏机制是一种非常重要且发生频率很高但仍未得到充分重视和深入认识的原油蚀变及凝析油成因机制;作者的研究表明塔里木盆地具备发生原油蒸发分馏的若干地质地球化学条件且有相关残油和凝析油形成.本文选择沙18井石炭系(C)海相凝析油和与之相关性最密切的沙14井奥陶系(O)海相高蜡原油进行重点讨论.沙18井和沙14井位于塔北桑塔木断块构造中部,沿构造发现诸多油气藏的事实表明其两侧断裂可充当原油蒸发分馏的通道.
The current view is that the sapropelic condensates in the kerogen are the products of pyrolysis of late mature organic matter (R0> 1.3%) or early macro-hydrocarbons in diagenesis. Recent studies have shown that the crude oil evaporation fractionation mechanism It is a very important and frequently occurring mechanism of crude oil alteration and condensate that has not yet been fully valued and deeply recognized. The author’s research indicates that there are some geo-geochemical conditions in the Tarim Basin where there is a correlation between the occurrence of crude oil evaporation and fractionation Residual oil and condensate oil.The paper chooses the Carboniferous (C) marine condensate in Sha 18 well and the closely related Ordovician (O) high-wax marine oil in Sha 14 well. Well Jinghe 14 was located in the middle of the Santaam fault block in northern Tarim, and the fact that many reservoirs were discovered along the tectonic formation shows that faults on both sides of the well can serve as a channel for crude oil evaporation and fractionation.