Abstract
The phenomena of seismic inelasticity of oil and gas fields has been experimentally discovered by us in more than 30 productive wells drilled in different geological conditions. Seismic waves attenuation and velocity dispersion were calculated from vertical seismic profiling data (VSP). After dozens experiments we obtained that the presence of hydrocarbon (HC) fluid in pores results in sharp increasing of abnormal seismic waves attenuation and velocity dispersion (velocity increases with frequency) at pay-zone depths. We did not measure this effect on water-filled reservoirs. The comparison of the results obtained from surface seismic data and VSP confirmed that this effect could be experimentally measured from 2D and 3D seismic data. The modern modication of AVD (Attenuation and Velocity Dispersion) technique has been tested un different regions of Russia, China, Vietnam, India, Colombia.
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