Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (6): 730-735.doi: 10.11743/ogg20050605

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Elastic properties of gas-bearing strata and seismic response

Wang Shangxu   

  1. China University of Petroleum, Beijing
  • Received:2005-07-27 Online:2005-12-25 Published:2012-01-16

Abstract:

Based on analysis of variation of elastic properties of natural gas and formation water under reservoir conditions,calculation of compressional velocity and shear velocity through gas-bearing strata,and physical si-mulation and experimental analysis,it is believed that gas-bearing strata are characterized by the following seismic responses: compresional velocity of gas with larger specific gravity is higher than that of gas with smaller specific gravity;compresional velocity in rocks containing saline water increases with increasing water salinity;and fluid properties have relatively large influence on compressional velocity,but have little influence on shear velocity.There would be a certain different seismic responses in strata bearing different fluids.Reflected energy in gas-bearing strata is relatively strong,while that in water-bearing strata is relatively weak.Seismic response in he-terogeneous gas-bearing strata would be characterized by relatively well developed diffracted wave.

Key words: bulk modulus, density, velocity, seismic response, gas-bearing strata

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