天然气地球科学

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C5—C7轻烃在原油地球化学研究中的应用——以塔北隆起哈拉哈塘凹陷奥陶系原油为例

程斌,王铁冠,常象春   

  1. 1.中国石油大学油气资源与探测国家重点实验室,北京 102249;2.山东科技大学,山东 青岛 266510
  • 收稿日期:2012-06-07 修回日期:2012-07-27 出版日期:2013-04-10 发布日期:2013-04-10
  • 通讯作者: 程斌chengbin626@163.com. E-mail:chengbin626@163.com.
  • 作者简介:程斌(1987-),男,山东东营人,博士研究生,主要从事油藏地球化学研究. E-mail:chengbin626@163.com.
  • 基金资助:

    中国博士后科学基金(编号:20110490539;2012750190);教育部科学技术重点项目(编号:212100)联合资助.

Application of C5-C7 Light Hydrocarbons in Geochemical Studies:A Case Study of Ordovician Crude Oils from the Halahatang Depression,Tabei Uplift

CHENG Bin, WANG Tie-guan, CHANG Xiang-chun   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2.Shandong University of Science and Technology, Qingdao 266510, China
  • Received:2012-06-07 Revised:2012-07-27 Online:2013-04-10 Published:2013-04-10

摘要:

以C5—C7轻烃化合物为工具进行原油成熟度、烃源岩有机质类型、原油生成温度等方面的地球化学研究。哈拉哈塘凹陷奥陶系原油样品庚烷值和异庚烷值分别为31.0~38.3及1.0~2.5,均值分别为36.0及2.2,据此得出样品属于高成熟油,烃源岩有机质类型为Ⅰ型和Ⅱ型。原油样品C5—C7轻烃馏分相对组成以正烷烃占优势,C7轻烃化合物相对组成以异构烷烃占优势,推测原油样品烃源岩以腐泥型有机质为主。样品Mango稳态催化轻烃参数K1值为0.97~1.07,均值为1.03,符合K1值相对稳定性规律,K2值为0.18~0.22,均值为0.20,符合海相原油特点;样品具有3RP和6RP,推测烃源岩以腐泥型有机质为主;原油生成温度为119.0~125.9℃。

关键词: C5—C7轻烃, 哈拉哈塘凹陷, 庚烷值, 异庚烷值, Mango稳态催化理论

Abstract:

Based on the analyses of C5-C7 light hydrocarbons,geochemical studies including oil maturity,source rocks organic-matter types and hydrocarbon-generating temperature are carried out.The heptane and isoheptane values can be used to distinguish oils and source rock organic-matter types.These two values of the Ordovician crude oils from the Halahatang depression range from 31.0 to 38.3 and 1.0 to 2.5,with the average of 36.0 and 2.2,respectively.And according to both parameters,the samples are highly mature and the source rocks organic-matter type is type Ⅰ-Ⅱ.The composition characteristics of  C5-C7  light hydrocarbons are usually used to determine the source rock organic-matter types.In oil samples,the C5-C7  light hydrocarbon fraction is dominated by normal alkanes,while the C7 light hydrocarbons is dominated by isoalkanes.It is estimated that the source rock is dominated by sapropelic organic-matter.The Mango light hydrocarbon parameters including the K1,K2 values and RP are widely used to estimate the source rock organic-matter types and calculate the hydrocarbon-generating temperature.The K1 values for the oil samples range from 0.97 to 1.07 with an average of 1.03 and the K2 values range from 0.18 to 0.22 with an average of 0.20.The oil samples possess 3RP and 6RP,hence,it is concluded that the source rock is dominated by sapropelic organic-matter,which is the same to the result conducted from the  C5-C7  and C7 light hydrocarbons composition characteristics.Besides,the hydrocarbon-generating temperature ranges from 119.0℃ to 125.9℃. 

Key words: C5-C7 light hydrocarbons, Halahatang depression, Heptane value, Isoheptane value, Mango steady state catalytic theory

中图分类号: 

  • TE122.1+13

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