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Discussion on Development Regularities of Karst Cave on Top of the Ordovician of Tahe Oilfield and Relation in OilGas

JING Jian-en1, WEI Wen-bo1,MEI Zhong-wu2   

  1. 1.School of Geophysics and Geoinformation Systems，China University of Geosciences，Beijing 100083,China;2.College of GeoExploration Science and Technology，Jilin University, Changchun 130026,China
  • Received:2004-10-08 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
  • Contact: JING Jian-en

Abstract: In Tahe oilfield, reservoir room of oil and gas is mainly composed of solution pores and cavities. In order to analyze distributing characteristics of oil and gas in the Ordovician carbonate of Tahe oilfield, the authors studied development regularities of karst cave of the area. The recognition markers of karst cave in drilling, core, logging, seismic data are introduced and karst caves in 14 boreholes are recognized. And karst topography of this region in early Hercynian is recovered. Through the research work, it has been founded that karst caves, which appear in depth range of 40 to 80 m, 110 to 130 m, 150 to 190 m, 230 to 260 m below the top of twinpeaklike carbonate, are conserved on side of karst slope near karst and valley, and the oil and gas is productive in developed part of karst cave in most boreholes.

Key words: Tahe oilfield, Ordovician, karst topography, karst cave, welllogging

CLC Number: 

  • P618.13
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