石油学报 ›› 2011, Vol. 32 ›› Issue (3): 411-416.DOI: 10.7623/syxb201103006

• 地质勘探 • 上一篇    下一篇

塔河油田加里东中期第Ⅲ幕岩溶作用

严  威 1  王兴志 1  张廷山 1  丁  勇 2  刘存革 2  吕海涛 2   

  1. 1 西南石油大学资源与环境学院  四川成都  610500; 2 中国石化西北分公司勘探开发研究院  新疆乌鲁木齐  830011
  • 收稿日期:2010-08-22 修回日期:2010-12-02 出版日期:2011-05-25 发布日期:2011-07-19
  • 通讯作者: 严 威
  • 作者简介:严 威,男,1981年2月生,2008年获西南石油大学硕士学位,现为西南石油大学在读博士研究生,主要从事沉积及储层地质学研究。
  • 基金资助:

    国家科技重大专项(2008ZX05049-01-002)“阿克库勒凸起奥陶系缝洞型储层发育规律研究”资助。

Investigations of the karst during the Episode Ⅲ of the mid-Caledonian in the Tahe Oilfield

YAN Wei 1  WANG Xingzhi 1  ZHANG Tingshan 1  DING Yong 2  LIU Cunge 2  LÜ  Haitao 2   

  • Received:2010-08-22 Revised:2010-12-02 Online:2011-05-25 Published:2011-07-19

关键词: 塔河油田, 奥陶系, 加里东中期, 岩溶, 第Ⅲ幕, 识别标志, 桑塔木组

Abstract:

Researches on the karst stage of Ordovician carbonates in the Tahe Oilfield have been ceaselessly renewed. Predecessors considered that there were mainly mid-Caledonian (Episode Ⅰ, Episode Ⅱ) karst and early-Hercynian karst in the Tahe Oilfield. However, through the study of petrology, sedimentology and seismology, this paper concluded that the Episode Ⅲ karst of mid-Caledonian existed in the Tahe Oilfield. The evidence indicated a series of recognition markers, such as there developed a corroded valley of a NS-trend paleo-river at the top of the Sangtamu Formation and the residual thickness of the formation within the Silurian coverage became thinner from southeast to northwest, etc. The main layer and area affected by the Episode Ⅲ were in the middle-lower Ordovician pure limestone stratum and the northwestern paleo-geographic high, respectively. Restricted by an aquifuge of the Sangtamu Formation and the global ice age from the end of Ordovician to early Silurian, this karst was represented by an exposed weathering crust and the karstification occurring along fractures, respectively in the north and the south to the wedge out of the Sangtamu Formation.

Key words: Tahe Oilfield, Ordovician, mid-Caledonian, karst, Episode Ⅲ, recognition mark, Sangtamu Formation