中国石油勘探 ›› 2006, Vol. 11 ›› Issue (6): 104-112,131.

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正星介(Cyprideis)初现面对柴达木盆地上油砂山组和下油砂山组分界的意义

张海泉,孙镇城,景民昌,路艳丽,董宁,袁秀君,曹丽   

  1. 中国石油青海油田公司勘探开发研究院;中国石油大学(北京)资源与信息学院;中国石油青海油田公司勘探开发研究院 甘肃省敦煌市736202;北京102249;甘肃省敦煌市736202
  • 出版日期:2006-12-15 发布日期:2006-12-15

Significance of First Appearance Datum of Cyprideis for Division of Shangyoushashan and Xiayoushas han Formations in Qaidam Bas in

Zhang Haiquan,Sun Zhencheng,Jing Minchang,Lu Yanli,Dong Ning,Yuan Xiujun and Cao Li   

  1. Zhang Haiquan1,Sun Zhencheng2,Jing Minchang2,Lu Yanli1,Dong Ning1,Yuan Xiujun1 and Cao Li1//1 Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang City,Gansu Province 736202; 2 Faculty of Resources and Information, China University of Petroleum, Beijing 102249
  • Online:2006-12-15 Published:2006-12-15

摘要: 柴达木盆地磁性生物地层柱上标定介形类浪花介科正星介属(Cyprideis)出现,其爆发的时代为中中新世晚期,大约距今12Ma。这是该盆地上油砂山组/下油砂山组分界对比的重要依据,也是地震T2′反射界面在全盆地追索对比和验证的重要标志。正星介属爆发点在塔里木盆地和准噶尔盆地也清晰可辨,对该两盆地新近系内部对比划分以及与柴达木盆地对比发挥了重要作用。油气勘探过程中大量钻井少取心,多取岩屑,并绘制分析自岩屑的正星介丰度曲线,基本上可以划定上油砂山组和下油砂山组之间的分界。

关键词: 介形类, 生物爆发, 地层对比, 化石丰度曲线, 钻井岩屑录井, 柴达木盆地

Abstract: T he a ppearance of fossil Cyprideis was demarcated on the magnetic biostratigraphic column in Qaidam Basin. T he eruptible time of Cyprideis is at the later Middle Miocene, a bout 12Ma ago, which is the important evidence to divide the boundary between Shangyoushashan Formation and Xiayoushashan Formation, and also key mark that seismic T2 reflect interface is used to trace and validate whole basin. The eruptible point of Cyprideis can be recognized clearly in Tarimand Junggar Basins, which has been pla yed a n importa nt role in the stra tum classification and contra sting of Neogene inside in these two basins as well as comparing with that in Qa idam Basin. It is suggested that the boundary between Shangyoushashan and Xiayoushashan Formation would be determined basica lly through sampling few core and much debris a nd drawing the abundant curve of Cyprideis existed in debris.

Key words: ostracoda, eruption point of biology, stratigraphic correlation, curve of fossil abunda nce, debris log in drilling well, Qa idam Basin

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