| 摘要: |
| 对奈曼凹陷奈1区块源与原油的族组分、饱和烃GC-MS特征进行系统分析，研究奈曼凹陷奈1 K块源岩与 原油的地球化学特征,并且进行油源对比分析。结果表明:原油与九下段源岩的正构烷烃分布完整，峰形呈双峰态， 主峰碳为nC23,次主峰碳为C17,具有明显的植烷优势，w(Pr)／w(Ph)分布在0．36—0．53；甾烷以规则甾烷为主,孕甾 烷、升孕甾烷、重排甾烷含量偏低,规则甾烷呈“V”型分布，C29C。甾烷W(20S)／w(20S+20R)和W(ββ)／w(aa+ββ)分别为0．27～0．49和0．23—0．39；萜烷以C。藿烷系列为主，三环萜烷比较发育，重排甾烷含餐低。伽马蜡烷含昔高，在原油样品中检测出含量较高的B一胡萝b烷，W(Ts)<"(Tm)，C，．升藿烷∞(22S)／w(22S+22R)、C，，W(22S)／w(22S+22R)分别为0．51～0．57和0．48～0．59，这螳特征表明该区原油主要来源于咸水深湖相强还原沉积环境:成油母质既有低等水生生物，又有陆生高等植物，母质类型为混合型；原油成熟度较低，主曼处了低熟一中等成熟阶段:奈曼凹陷奈l区块原油主要来源于下白孚统九下段源岩。。 |
| 关键词: 奈曼凹陷 奈丨区块 原油 生物标志物 地球化学特征 油源对比 |
| DOI：10.3969/j.issn.1673-5005.2012.03.008 |
| 分类号:TE 122.2 |
| 基金项目:中国石油辽河油田分公司项目 |
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| Geochemical characteristics of crude oil and oil-source analysis in Nai 1 block for Naiman depression，Kailu Basin |
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ZHAO Xing-qi1,CHEN Jian-fa1,ZHANG Chen1,2,GUO Wang1,SHI Sheng-bao1
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(1. State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum，Beijing 102249, China;2. PetroChina Tarim Oilfield Company, Korla 841000，China)
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| Abstract: |
| Based on systematic analysis of group compositions，saturated hydrocarbon GC—MS for source rocks and crude oil in Nai 1 block，the geochemical characteristics and oil—source correlation were studied．The follwing are the characteristics ofcrude oil and lower Jiufotang formation flource rocks:The distribution of alkane is complete，possessing double peaks whicha”aC23 and C17 respectively．Content ofphytane is obviously higherthan pristane"(Pr)／w(Ph)=0．36-0．53．For sterane series，the content of regular sterane，distributing in the shape of?V，is also obviously higher than the counterpart of pregnane and rearranged sterane．Besides，the value ofthe parameters ofC29埘(20S)／w(20S+20R)and w(ββ)／w(aa+ββ)81"e respectively 0．27—0．49 and 0．23—0．39．The terpane$erie$is characterized by major part of C30Hopane，relatively higher coflteat of tricyclic diterpane and gammacerane but lower content of rearranged sterane，W(Ts)<"(Tm)．The values of C”W(22S)／w(22S+22R)and C32W(22S)／w(22+22R) arerespectively 0．51—0．57 and 0．48-0．59．All ofthese charac—teristics mentioned above show that the crude oil in research area mainly origins from strong reducing environment of salt—water deep lacustrine tacies．Parent materials come from both lower aquatic plants and terrestrial higher plants．Maturity of crude oil is low and mainly distributes from lower to middle stage．The crude oil in Nai 1 block is mainly from lower Jiufotang formation in Lowar Cretaceous．. |
| Key words: Naiman depression Nai 1 brock crude oil biomarkers geochemical characteristics oil source correlation |
