天然气地球科学 ›› 2019, Vol. 30 ›› Issue (1): 74–82.doi: 10.11764/j.issn.1672-1926.2018.11.007

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地奥陶系马五5亚段白云岩储层形成机理与展布规律

张道锋,姚泾利,高星,席明利,赵会涛,闫小雄,付勋勋   

  1. 中国石油长庆油田分公司,陕西 西安  710018
  • 收稿日期:2018-09-29 修回日期:2018-11-19 出版日期:2019-01-10 发布日期:2019-01-31
  • 通讯作者: 高星(1983-),女,内蒙古鄂尔多斯人,工程师,主要从事天然气地质研究. E-mail:gxing_cq@petrochina.com.cn.
  • 作者简介:张道锋(1978-),男,江西萍乡人,高级工程师,主要从事天然气地质研究.E-mail:zhangdaofeng_cq@petrochina.com.cn.
  • 基金资助:
    中国石油天然气股份有限公司重大专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”项目(编号:2016E-0502)资助.

Formation mechanism and distribution regularity of Ordovician Ma55 dolomite reservoir in Ordos Basin

Zhang Dao-feng,Yao Jing-li,Gao Xing,Xi Ming-li,Zhao Hui-tao,Yan Xiao-xiong,Fu Xun-xun   

  1. PetroChina Changing Oil Field Branch Company,Xi’an 710018,China
  • Received:2018-09-29 Revised:2018-11-19 Online:2019-01-10 Published:2019-01-31

摘要: 以白云岩岩石结构分析为基础,结合白云岩碳氧同位素、锶同位素、有序度等地球化学测试资料,对鄂尔多斯盆地奥陶系马五5亚段白云岩形成机理进行了探讨。研究表明,马五5亚段具有储集意义的白云岩为粉晶白云岩和泥粉晶白云岩,其中泥粉晶白云岩有序度为0.71,阴极发光表现为不发光,δ13C值为-0.10‰,δ18O值为-6.30‰;粉晶白云岩阴极发光以暗红色为主,有序度为0.85,δ13C值为-0.68‰,δ18O值为-6.58‰。泥粉晶白云岩和粉晶白云岩的碳氧同位素值与全球中奥陶世海水值大体相当,反映了白云岩化作用流体与同期海水有关,具有渗透回流白云岩化作用特征。结合古地理背景,建立了渗透回流白云岩化作用模式,指出马五5亚段沉积期古气候干燥、炎热,同生期具备形成富镁卤水的能力,是马5亚段白云岩形成的关键,同生期白云岩化作用奠定了白云岩的展布格局,为浅埋藏期富镁卤水提供有效的下渗通道,同时有利于埋藏期孔隙的保存。马五5亚段白云岩在空间上有序分布,靠近古隆起区以整段白云岩为主,榆林—神木地区受伊盟古陆南斜坡影响,以中上段白云岩为主,靖边—安塞地区以中段白云岩为主,这些白云岩段是有利的勘探目标。



关键词: 鄂尔多斯盆地, 奥陶系马五5亚段, 白云岩成因, 渗透回流白云岩化作用, 白云岩储层展布

Abstract: Based on dolomite structure analysis,the formation mechanism of Ordovician Ma55 dolomite was discussed with geochemistry test data of carbon isotopes,oxygen isotopes,strontium isotopes,and order degree.The study showed that reservoir-effective lithology is mud-powder crystal dolomite and powder crystal dolomite.The mud-powder crystal dolomite is non-cathode luminescence with 0.71 order degree,0.1‰ , δ13C,and -6.3‰ δ18O,while the powder crystal dolomite is mainly dark-red cathode luminescence with 0.85 order degree,-0.68‰ δ13C,-6.58‰ δ18O.The carbon and oxygen isotopes of mud-powder crystal dolomite and powder crystal dolomite are roughly equivalent to the value of seawater in the Middle Ordovician.It reflected that dolomitization fluid is related to the same period seawater,with characteristics of reflux-seepage dolomitization.Combined with palaeogeographic background,the reflux-seepage dolomitization model was established.The dry and hot paleoclimate,which had the ability to form Mg-rich brine in Ma55 deposition period,is the key to form Ma55 dolomite.Syngenetic dolomitization prepared the ground for the spread of dolomite,provided effective seepage channel for supergene dolomitization,and was conducive to the preservation of pores in burial period.Near the paleouplift area,the whole segment is dominanated by dolomite.Influenced by southern slope of the Yimeng paleocontinent,the middle and upper segment is dominanated by dolomite in Yulin-Shenmu area,and the middle segment is dominated by dolomite in Jingbian-Ansai area.The whole dolomite segment and the middle dolomite segment are favorable exploration targets.

Key words: Ordos Basin, Ordovician Ma55, Genesis of dolomite, Reflux-seepage dolomitization, Dolomite reservoir distribution

中图分类号: 

  • TE122.2
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