石油与天然气地质 ›› 2009, Vol. 30 ›› Issue (1): 85-89.doi: 10.11743/ogg20090112

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济阳坳陷民丰地区天然气成因

胡晓庆1, 金强2, 王秀红3, 林腊梅2, 王力2, 王娟2, 王婷婷4   

  1. 1. 中国海洋石油总公司, 北京石油研究中心, 北京, 100027;
    2. 中国石油大学, 地球资源与信息学院, 山东, 东营, 257061;
    3. 中国石油化工股份有限公司, 胜利油田分公司, 地质科学研究院, 山东, 东营, 257015;
    4. 中国石油天然气集团公司, 辽河石油勘探局, 辽宁, 盘锦, 124010
  • 收稿日期:2008-09-10 出版日期:2009-02-25 发布日期:2012-01-16
  • 基金资助:

    国家自然科学基金项目(40572084)

Origin of natural gas in Mingfeng area,the Jiyang Depression

Hu Xiaoqing1, Jin Qiang2, Wang Xiuhong3, Lin Lamei2, Wang Li2, Wang Juan2, Wang Tingting4   

  1. 1. CNOOC Research Center, Beijing 100027, China;
    2. China University of Petroleum, Dongying, Shandong 257061, China;
    3. Research Institute of Geological Sciences, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257100, China;
    4. CNPC Liaohe Petroleum Exploration Bureau, Panjing, Liaoning 124010, China
  • Received:2008-09-10 Online:2009-02-25 Published:2012-01-16

摘要:

济阳坳陷民丰地区天然气存在源岩热解和原油裂解成因的争议,利用古近系沙四段烃源岩、原油样品的热模拟实验与地质分析相结合的方法,提出了源岩热解气和原油裂解气的鉴别标志。源岩热解气以甲烷的快速生成为特征,成熟阶段,源岩热解气的环烷烃和苯含量低,高成熟阶段,源岩热解气和原油裂解气均以环烷烃和苯含量高为特征。民丰沙四段凝析油和天然气的ln(C1/C2)比ln(C2/C3)变化大,且环烷烃、异构烷烃和芳烃含量较高,具有高成熟阶段源岩热解气的特征,研究认为民丰地区天然气为源岩热解成因。

关键词: 源岩热解气, 原油裂解气, 轻烃, 热模拟实验, 济阳坳陷

Abstract:

It is controversial about the origin of the natural gas in Minfeng area.A set of indexes for differentiating kerogen-pyrolysis gas and oil-cracked gas is presented based on geologic analysis and thermal simulation experiments on source rocks and crude oil samples from the Es4.In mature phase,the kerogen-pyrolysis gas features in rapid generation of methane and low contents of cyclane and benzene.While in high mature phase,both kerogen-pyrogenic gas and oil-cracked gas are characterized by high contents of cyclane and benzene.The condensate oil and natural gas in Mingfeng area show a larger scope of ln(C1/C2) ranging from 2 to 6 than that of ln(C2/C3) varing from 1 to 1.5 and have relatively high contents of cyclane,isoalkane and aromatic hydrocarbon,revealing the characteristics of kerogen-pyrolysis gas in high mature phase.Therefore,it is believed that the natural gas in Minfeng area is of kerogen-pyrolysis gas.

Key words: kerogen-pyrolysis gas, oil-cracked gas, light hydrocarbon, thermal simulation experiment, Jiyang Depression

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