含气地层弹性性质及其波场响应

doi:10.11743/ogg20050605

Abstract

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

CLC Number:

P631.445

Wang Shangxu. Elastic properties of gas-bearing strata and seismic response[J]. Oil & Gas Geology, 2005, 26(6): 730-735.

References

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Elastic properties of gas-bearing strata and seismic response

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