HIGH QUALITY SOURCE ROCKS OF NANTUN FORMATION IN WUERXUN DEPRESSION, THE HAILAER BASIN
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摘要: 运用钻井岩心及测井资料,对海拉尔盆地乌尔逊凹陷烃源岩的生物发育、地球化学特征进行研究,认为乌尔逊凹陷南屯组发育有薄层优质烃源岩,它们有机质丰度高,类型好,生烃潜力大。结合研究区地质条件,并参考前人的研究成果,建立了适合本区优质烃源岩的评价标准;认为本地区烃源岩在生烃潜量(S1+S2)大于20mg/g,氯仿沥青"A"大于0.3%,TOC大于5.0%,总烃(HC)大于700×10-6的情况下为优质烃源岩;同时,运用有机碳测井评价方法,结合研究区优质烃源岩评价标准,分析了区内诸多钻井优质烃源岩的分布特征。结果表明,研究区优质烃源岩主要发育在南屯组,特别是该组的上部,南屯组一段烃源岩的厚度大于南屯组二段。总的来说,本区优质烃源岩的发育对盆地油气成藏产生较大的生烃贡献。Abstract: Source rocks of Wuerxun Depression of the Hailaer Basin were investigated to characterize their biological developments,organic geochemistry.Together with wire logs and well cores analyses,three series of high quality source rocks in Nantun Formation were discovered.They all have good organic types,high abundance of organic materials and high hydrocarbon potentials.Combined with geological setting and referred previous study,the criterion of high quality source rocks was established[(S1+S2) 20mg/g,chloroform bitumen "A"> 0.3%,TOC>5.0% and HC>700×10-6],which was fit for the whole study area.Through the method of organic carbon log,the distribution of high quality source rocks was confirmed,which showed that the high quality source rock was mainly developed as thin layere in the Nantun Formation,especially in the upper part.In short,the development of the high quality source rocks contributed greatly to the pool forming.
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