天然气地球科学

• 天然气地质学 • 上一篇    下一篇

柴达木盆地西南部凹陷特征及生烃潜力分析

张小军,曹正林,孙秀建,石亚军,常海燕   

  1. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020
  • 收稿日期:2011-11-02 修回日期:2012-06-25 出版日期:2012-10-10 发布日期:2012-10-10
  • 通讯作者: 张小军xj_zhang@petrochina.com.cn E-mail:xj_zhang@petrochina.com.cn
  • 作者简介:张小军(1967-),男,陕西洋县人,高级工程师,博士,主要从事油气地质综合研究工作.E-mail:xj_zhang@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份公司重大专项(编号:07-01Z-01-02)资助.

Characteristics of Depression and Their Hydrocarbon Generation  Potency in Southwestern Qaidam Basin

ZHANG Xiao-jun, CAO Zheng-lin, SUN Xiu-jian, SHI Ya-jun, CHANG Hai-yan   

  1. Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China
  • Received:2011-11-02 Revised:2012-06-25 Online:2012-10-10 Published:2012-10-10

摘要:

13个区块的三维大连片资料显示柴达木盆地西南部(简称“柴西南”)现今存在红狮、扎哈泉、阿拉尔和切克里克等4个主要凹陷(或次级凹陷)。通过对凹陷构造演化和生烃潜力分析,认为红狮凹陷、扎哈泉凹陷和切克里克东凹陷为早期持续沉降凹陷,发育古近系—新近系厚度较大的优质烃源岩,生烃潜力大。同时,结合油源对比和油气分布指出,柴西南具有大凹陷局部生烃中心,油气“环凹近源”聚集的特征,预算红狮和扎哈泉—切克里克2个生烃中心资源量为8.86×108t,临近生烃中心长期持续发育的七个泉—砂西、跃进、乌南、昆北等古鼻状凸起及外围斜坡带,不但有红狮凹陷和扎哈泉—切克里克凹陷2个生烃中心为其提供充足的油源,而且继承性发育多个三角洲沉积体系前缘相带、滨浅湖滩坝优质储砂体,源储配置好,是岩性、岩性—构造油气藏勘探的有利区带。

 

关键词: 柴西南区, 凹陷特征, 生烃潜力, 有利区带

Abstract:

According to 3D seismic data in southwestern Qaidam basin,it can be find that there are 4 secondary depression:Hongshi,Zhahaquan,Alaer and Qiekelike.Through research on structure evolution and hydrocarbon generation of the depression,we get a viewpoint that Hongshi,Zhahaquan and eastern Qiekelike depression are early sustained sedimentation,the source rocks in Tertiary System have a characteristics of multi-bed,great thickness and superior quality,and Zhahaquan and eastern Qikelike is an entire hydrocarbon generation depression in early time.Combined with oil source comparison and oil-gas,it can be indicated that there are two hydrocarbon generation center in Hongshi and Zhahaquan-Qiekelike with a figure of partly generating hydrocarbon in big depression and oil-gas accumulate near-source and around the depression.While,the two source center contain 8.86 hundred million tons oil and gas.Provided hydrocarbon by the two oil source center,Qigequan-Shaxi,Yuejin,Wunan,and Kunbei,which develop several delta frontal zones and beach bar sand zone,become a favorable area for lithologic hydrocarbon reservoir.

 

Key words: Southwestern Qaidam basin, Characteristics of depression, Hydrocarbon generation potency, Favorable area

中图分类号: 

  • TE122.1

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