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| 未熟—低熟油研究现状与存在的问题 | |
| 引用本文： | 李素梅,庞雄奇,金之钧,黎茂稳.未熟—低熟油研究现状与存在的问题[J].地质论评,2003,49(3):298-304. |
| 作者姓名： | 李素梅 庞雄奇 金之钧 黎茂稳 |
| 作者单位： | 1. 石油大学盆地与油藏研究中心,北京昌平,102249;石油大学石油天然气成藏机理教育部重点实验室,北京昌平,102249 2. 石油大学石油天然气成藏机理教育部重点实验室,北京昌平,102249 3. 加拿大联邦地质调查局卡尔加里分部,T2L,2A7 |
| 基金项目： | 国家重点基础研究项目(编号G199943310) |
| 摘 要： | 目前存在多种未熟-低熟油成烃机理的说法，但现有未熟-低熟油生烃模式能否用于指导勘探仍然有待于进一步检验。富类脂可溶有机质生烃被认为是未熟-低熟油生烃模式之一，但依据舀烷(特别是甲藻舀烷)的分布特征，东营凹陷牛庄洼陷南斜坡沙四段富藻类未熟-低熟页岩与八面河油田的原油几乎没有可比性，充分说明低演化阶段的藻类类脂物并非该区原油的主要成烃母质。未熟-低熟油田总与邻近的有利生油凹陷相伴以及某些未熟-低熟油的混合成熟度性质，暗示未熟-低熟油区的成熟油贡献，该结论已为中国两个典型未熟-低熟油田即东营凹陷八面河油田与苏北盆地金湖凹陷的最近研究结果所证实。现有资源量计算方法不太适用于未熟-低熟油，这可能导致了部分油田未熟-低熟资源量计算结果偏高。生物标志物标样定量技术是识别原油未熟-低熟性及油源追踪的有效途径，在油气勘探过程中还应加强地化与地质的有机结合。 |
| 关 键 词： | 未熟－低熟油 成烃机理 生烃模式 成熟度 混合油 有机质 生物标志物 油气勘探 干酪根 |
Present Studies and Problems of Immature Oils |
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| LI Sume,PANG Xiongqi,JING Zhijun,LI Maowen Basin & Reservoir Research Center,University of Petroleum,Beijing,China Key Laboratory of Hydrocarbon Accumulation,Ministry of Education,Beijing,ChinaGeological Survey of Canad,Calgary,TL,A,Canada.Present Studies and Problems of Immature Oils[J].Geological Review,2003,49(3):298-304. | |
| Authors: | LI Sume PANG Xiongqi JING Zhijun LI Maowen Basin & Reservoir Research Center University of Petroleum Beijing China Key Laboratory of Hydrocarbon Accumulation Ministry of Education Beijing ChinaGeological Survey of Canad Calgary TL A Canada |
| Abstract: | Several genetic mechanisms of less mature oils have been proposed by previous researchers, and solvable organic matter generating hydrocarbons in early evolution stage has been suggested as one of the most important mechanisms for considerable immature reserves in rifted-basins such as the Jinhu depression, North Jiangsu-South Yellow Sea basin and Bamianhe oilfield, Bohai Bay basin of East China. However, our recent investigations show that some of the genetic models of less mature oils cannot be used to guide oil exploration. Oil-rock corrections have indicated that the so-called immature oils of the two basins are mainly derived from intervals located in normal oil-windows. There is hardly correlation between the alga-rich Es4 shale developed in brackish environments of the south slope of the Nuzhuang sag, Dongying depression and Bohai Bay basin and the crude oils in Bamianhe Oilfield in terms of the distribution patterns of steroids especially dinostanes. The results suggest that solvable organic matter in shale with buried depths less than 2700 m of the area, which was considered to be the main source rock of Bamianhe Oilfield in previous studies, is unlikely to be the essential source of the oils. Immature oils mostly coexist with adjacent favorable oil-kitchens in East China and the fact that the so-called immature oils of the typical immature oilfield i. e. the North Jiangsu-South Yellow Sea basin have features of mature oils infer that oil-mixing is a common phenomenon in some Tertiary rifted-basins of East China. Some methods of resource assessment may not be suitable for less mature oils if other genetic mechanisms rather than the traditional kerogen degradation account for immature oils. A new assessment method showes that the amount of immature resources in the area studied is not as large as previously calculated. Reinvestigation is necessary in basins bearing immature oils, adopting new analysis techniques such as biomarker quantification. It will be useful in determining the real maturity and the proportion of mixed oils with different sources. |
| Keywords: | immature oil mixed oil maturity genetic mechanism petroleum resource |
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