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Volume 31 Issue 2
Jun.  2012
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Article Navigation >  CARSOLOGICA SINICA  > 2012  >  31(2): 220-226
CAO Jian-wen, JIN Yi-zhi, XIA Ri-yuan, LIANG Bin, ZOU Sheng-zhang. Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield[J]. CARSOLOGICA SINICA, 2012, 31(2): 220-226. doi: 10.3969/j.issn.1001-4810.2012.02.017
Citation: CAO Jian-wen, JIN Yi-zhi, XIA Ri-yuan, LIANG Bin, ZOU Sheng-zhang. Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield[J]. CARSOLOGICA SINICA, 2012, 31(2): 220-226. doi: 10.3969/j.issn.1001-4810.2012.02.017
shu

Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield

doi: 10.3969/j.issn.1001-4810.2012.02.017
  • 1.

    Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, MLR & GZAR

  • 2.

    Reserch Institute of Petroleum Exploration and Development, Northwest petroleum Bureau, Sinopec

  • Received Date: 2011-12-29
  • Publish Date: 2012-06-25
    Abstract
  • Ordovician carbonate is an important exploration area in Tahe oil field. The major reservoir type is karst seam and hole system in weathered crust formed by paleo-karstification. This paper analyzes core, well drilling, mud-logging, well-logging and seismic datas in the 4th block systematically. It is found that paleo karst with obvious karst marks is well developed in karst seam and hole system in the study area. The paleo karst marks including following features, such as infillings that different from the primary lithology in the core; the phenomena of lost circulation and kicking when drilling; great changes in physical property parameters in well-logging curves; irregular, weak or beaded reflection in seismic reflection profiling. The overall development degree of the paleo-karst is controlled mainly by soluble rock, unconformity plane, paleo landscape and climate. The spatial distribution of paleo-karst is controlled by soluble rock and unconformities; the weathering range, depth and intensity decided by paleo-land scape; and the paleo-climate decide the total extent of the paleo-karst. A lot of karst seam and hole systems are formed under the influence of these factors.

     

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