| 江陵凹陷下第三系两个含油系统油源岩的地化特征 |
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| 引用本文： | 江荣沛,江继纲.江陵凹陷下第三系两个含油系统油源岩的地化特征[J].沉积学报,1997,15(2):19-25. |
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| 作者姓名： | 江荣沛 江继纲 |
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| 作者单位： | 江汉石油管理局勘探开发研究院 湖北潜江 433124 |
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| 摘 要： | 本文论述了江陵凹陷下第三系两个含油系统中原油地化特征截然不同是由两套烃源岩成烃母质不同和成熟度不同造成的。第一含油系统新沟咀组下段Ⅱ油组中、下部-泥隔层上部为主力烃源岩，已达到中等-好生油岩级别，可提供较丰富的油源。研究表明，这套主力烃源岩在不同区带存在自身单一油源供油或自身与外来双重油源供油两种模式，石油运移距离可达１０ｋｍ以上，它基本上控制了新沟咀组油田和荆沙组油藏的分布范围。第二含油系统潜江组烃源岩尽管埋深多浅于２０００ｍ（Ｒｏ＜０.５%）不成熟，但在潜江组潜三、四段地层中发现了有机质丰度很高，母质类型为ⅠＳ型和Ⅰ型干酪根的烃源岩，具有早期生成未成熟油的潜力，可以形成原生油藏，应在勘探中给予重视。
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| 关 键 词： | 含油系统 原油地化特征 烃源岩 江陵凹陷 |
| 收稿时间： | 1996-10-12 |
Oil Source Analysis of Two Paleogene OilSystems in Jiangling Depression |
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| Institution: | Exploration and Development Institute of Jianghan Petroleum Bureau Qianjiang City Hubei Province P R China 433124 |
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| Abstract: | This paper dealt with that oils from tow Paleogene oil systems in Jiangling Depression have greatlydifferent geochemical properties due to different source matter and different maturities of two sets of hy-drocarbon source rocks. In the first oil system, the principal souce sequence is ranging from the middleand lower parts and the upper partor the mudstone, barrier in the formation, it is of medium to goodsource rock and has generated relatively abundant hydrocarbons. Studies showed that in different areasor zones this oil system has two different oil souse models, i. e. oueis, the system itself alone; the other isthe system with allochthonous source. Oil migration distance may he as far as over 10 km. The source models and migration distance arebasically responsible for the distribution of Xingouzui. Formation and Jingsha Formation oil reservoirs.In the second oil system,source rocks in Qianjiang Formation, though being shallowly buried less than2000 m(Ro<0.5%),had been found to haven high abundance of organic matter in the 3rd and 4th mem-hers of Qianjiang Formation. kerogens are of Typel and Typel S, having the potential to generate im-mature oil inshould he paidearly stage of transformation, soas to constitute oil reservoirs in situ.Properattentiont should be paid to them in exploration. |
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