Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (1): 94-97.doi: 10.3969/j.issn.1673-8926.2011.01.016

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Seismic response of 40m caves with different distances from limestone top bounday

SUN Dong1， WANG Hongbin1， YONG Xueshan1， ZHANG Huquan1， GAO Jianhu1， DONG Ruixia2   

  1. 1. Research Institute of Petroleum Exploration & Development-Northwest（NWGI）， PetroChina， Lanzhou 730020，China； 2. Research Institute of Exploration and Development， Tarim Oilfield Company， PetroChina， Korla 841000， China
  • Online:2011-02-20 Published:2011-02-20

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Abstract:

The Upper Ordovician reservoirs mostly are close to the limestone top boundary where seismic reflection is strong, which causes influence on the seismic response of the reservoir. Forward modeling result shows that: the seismic reflection at the limestone top boundary is absent or decreased obviously with disorder inside reflection when the distance from fracture-cavity to the limestone top boundary ranges from 0 to 30 m; the seismic reflection at the limestone top boundary softens with strong inside reflection when the distance fromfracture-cavity to the limestone top boundary is 60m; the seismic reflection at the limestone top boundary has no change when the distance from fracture-cavity to the limestone top boundary is over 150 m, and the inside reflection presents moniliform. Based on the fine calibration of the actual drilling, the forward modeling result is verified.

Key words: problem discussion, research approach, key technologies, petroleum seismogeology

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