Geochemical features and classification of crude oil in the southern margin of Junggar Basin,Northwestern China

doi:10.7623/syxb201511001

Acta Petrolei Sinica ›› 2015, Vol. 36 ›› Issue (11): 1315-1331.DOI: 10.7623/syxb201511001

• Petroleum Exploration • Next Articles

Geochemical features and classification of crude oil in the southern margin of Junggar Basin,Northwestern China

Chen Jianping^1,2,3, Wang Xulong⁴, Deng Chunping^1,2,3, Zhao Zhe¹, Ni Yunyan^1,2,3, Sun Yongge⁵, Yang Haibo⁴, Wang Huitong^1,2,3, Liang Digang^1,2,3

1. Petrochina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. State key laboratory of enhanced oil recovery, Beijing 100083, China;
3. Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China;
4. Petrochina Xinjiang Oilfield Company, Xinjiang Karamay, 834000, China;
5. School of Earth Sciences, Zhejiang University, Zhejiang Hangzhou 310027, China

Received:2015-06-09 Revised:2015-10-05 Online:2015-11-25 Published:2015-12-05

准噶尔盆地南缘油气生成与分布规律——原油地球化学特征与分类

陈建平^1,2,3, 王绪龙⁴, 邓春萍^1,2,3, 赵喆¹, 倪云燕^1,2,3, 孙永革⁵, 杨海波⁴, 王汇彤^1,2,3, 梁狄刚^1,2,3

1. 中国石油勘探开发研究院北京 100083;
2. 提高石油采收率国家重点实验室北京 100083;
3. 中国石油天然气集团公司油气地球化学重点实验室北京 100083;
4. 中国石油新疆油田公司新疆克拉玛依 834000;
5. 浙江大学地球科学学院浙江杭州 310027

通讯作者: 陈建平,男,1962年10月生,1983年获山东矿业学院学士学位,2003年获中国矿业大学(北京)博士学位,现为中国石油勘探开发研究院教授级高级工程师、中国石油天然气集团公司油气地球化学重点实验室副主任,主要从事油气地球化学研究工作。Email:chenjp@petrochina.com.cn
作者简介:陈建平,男,1962年10月生,1983年获山东矿业学院学士学位,2003年获中国矿业大学(北京)博士学位,现为中国石油勘探开发研究院教授级高级工程师、中国石油天然气集团公司油气地球化学重点实验室副主任,主要从事油气地球化学研究工作。Email:chenjp@petrochina.com.cn
基金资助:
中国石油天然气股份有限公司科学研究与技术开发项目(06-01A-01-02、2011A-0201、2014A-0211)资助。

Abstract

Abstract:

Crude oil is widely distributed at the southern margin of Junggar Basin, which presents different geochemical characteristics in various areas. According to carbon isotope and biomarker composition characteristics, crude oil herein can be divided into four typical types. The first type is characterized by light carbon isotope compositions, whole oil δ¹³C generally less than -29‰, gentle carbon isotopic distribution of n-alkane, δ¹³C generally less than -28‰, abundant β-carrotane, sterane dominated by regular sterane C₂₈ and C₂₉, low diasterane content, and great changes in gammacerane content. The second type is characterized by heavy carbon isotope compositions, whole oil δ¹³C generally ranged within -28‰ and -26‰, gentle carbon isotopic distribution in n-alkane, δ¹³C generally greater than -28‰, high Pr/Ph ratio, sterane dominated by regular sterane C₂₉ and diasterane, tricyclic terpane dominated by C₁₉, and very low gammacerane content. The third type is characterized by light carbon isotope compositions, whole-oil δ¹³C generally less than -29‰, carbon isotopic distribution in n-alkane (above C₉) dramatically decreased with the carbon number increasing, δ¹³C ranged within -27‰ and -34‰, Pr/Ph ratio less than 1.0, sterane C₂₇, C₂₈ and C₂₉ in "V" shaped distribution, high contents of isocholestane and diasterane, as well as Ts, C₂₉Ts and C₃₀ rearranged hopanes, Ts/Tm >1, high content of gammacerane with two isomers, and high sterane/terpane ratio. The fourth type is characterized by heavy carbon isotope compositions, whole-oil δ¹³C generally ranged within -28‰ and -26‰, carbon isotopic distribution in n-alkane (above C₉) dramatically decreased with the carbon number increasing, δ¹³C ranged within -23‰ and -29‰, sterane C₂₇, C₂₈ and C₂₉ in "V" shaped distribution and dominated by ααα-20R, low abundance of isocholestane, extremely abundant dinosteranes, tricyclic terpane dominated by C₁₉, and low content of gammacerane.

Key words: Junggar Basin, southern margin, crude oil, carbon isotope, sterane, terpane

摘要：

准噶尔盆地南缘地区原油分布广泛,不同地区原油具有不同的地球化学特征。按照碳同位素与生物标志物组成特征可以分为4种典型类型:1第1类原油典型特征是碳同位素组成轻,全油δ¹³C值通常小于-29‰,正构烷烃分子碳同位素分布比较平缓,δ¹³C值通常小于-28‰,含有较丰富的β-胡萝卜烷,甾烷以C₂₈、C₂₉规则甾烷为主,重排甾烷低,伽马蜡烷含量变化较大;2第2类原油碳同位素组成重,全油δ¹³C值通常在-28‰~-26‰,正构烷烃分子碳同位素分布比较平缓,δ¹³C值通常大于-28‰,Pr/Ph比值高,甾烷以C₂₉规则甾烷和重排甾烷为主,三环萜烷以C₁₉为主,伽马蜡烷含量很低;3第3类原油碳同位素组成轻,全油δ¹³C值通常小于-29‰,C₉以上正构烷烃分子碳同位素分布随碳数增高大幅下降,δ¹³C值在-27‰~-34‰,Pr/Ph比值小于1.0,C₂₇、C₂₈、C₂₉甾烷呈"V"型分布,异胆甾烷、重排甾烷含量高,Ts、C₂₉Ts、C₃₀重排藿烷高,Ts/Tm >1,伽马蜡烷含量高且具有两个异构体,甾/萜烷比值高;4第4类原油碳同位素组成重,全油δ¹³C值通常在-28‰~-26‰,C₉以上正构烷烃分子碳同位素分布随碳数增高下降幅度大,δ¹³C值在-23‰~-29‰,C₂₇、C₂₈、C₂₉甾烷呈"V"型分布且以ααα-20R为主,异胆甾烷丰度低,甲藻甾烷尤为丰富,三环萜烷以C₁₉为主,伽马蜡烷含量较低。

关键词: 准噶尔盆地, 南缘, 原油, 碳同位素, 甾烷, 萜烷

CLC Number:

TE122.1+13

Chen Jianping, Wang Xulong, Deng Chunping, Zhao Zhe, Ni Yunyan, Sun Yongge, Yang Haibo, Wang Huitong, Liang Digang. Geochemical features and classification of crude oil in the southern margin of Junggar Basin,Northwestern China[J]. Acta Petrolei Sinica, 2015, 36(11): 1315-1331.

陈建平, 王绪龙, 邓春萍, 赵喆, 倪云燕, 孙永革, 杨海波, 王汇彤, 梁狄刚. 准噶尔盆地南缘油气生成与分布规律——原油地球化学特征与分类[J]. 石油学报, 2015, 36(11): 1315-1331.

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Geochemical features and classification of crude oil in the southern margin of Junggar Basin,Northwestern China

准噶尔盆地南缘油气生成与分布规律——原油地球化学特征与分类

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