轻烃星图在石油勘探中的应用

Application of light hydrocarbon star diagrams in petroleum exploration.

利用轻烃Ｃ６、Ｃ７化合物编制两种星图。一种是轻烃蚀变星图，用来研究原油由于水洗作用、生物降解作用和蒸发分馏作用等次生蚀变作用对轻烃化合物组成的影响；另一种是轻烃对比星图，用来进行原油之间的地球化学参数对比研究。应用这两种星图对塔里木盆地同一口井和同一个油气田的凝析油与原油之间进行了对比研究，同时探讨了同一个构造中相同成因原油之间的次生蚀变作用，收到了较好的效果。图３表２参１２（梁大新摘）

Two star diagrams (light hydrocarbon transformation star diagram, light hydrocarbon correlation star diagram) have been developed based on C 6 and C 7 compounds of light hydrocarbon. Light hydrocarbon transformation star diagram is used for studying compositional variations of C 6 and C 7 compounds in light hydrocarbon caused by transformation, e.g. water washing, biodegradation and evaporation fractionation. Light hydrocarbon correlation star diagram is used for studying the geochemical correlation between crude oils, especially, both condensate and oil, this star diagram is more convenient and effective. According to light hydrocarbon transformation star diagram and light hydrocarbon correlation star diagram in this paper, we have already done correlation of both condensates and crude oils for the Well YH3 and the Hongqi field in Tarim basin, at the same time, and approached secondary transformation of same genetic oils in the same structure in Tarim basin.