Patent ID: 9234971
Filing Date: 2016-01-12
CPC Classification: G01V

Claim Text:
1. A method, comprising: transmitting, from a first seismic source, a swept wave into a subterranean reservoir at a first time; receiving, at a seismic sensor, a first return seismic signal in response to the swept wave; transmitting, from a second seismic source comprising an array of seismic stations, a monofrequency signal into the subterranean reservoir at a second time different from the first time; receiving, at the seismic sensor, a second return seismic signal in response to the monofrequency signal; detecting, in the second return seismic signal, a Drag Wave frequency corresponding to elastic nonlinear interactions of the monofrequency signal propagating through the subterranean reservoir; calculating a ratio between the monofrequency signal and the Drag Wave frequency; generating a synthetic signal by converting the swept wave using a transfer function based, at least in part, on the calculated ratio between the monofrequency signal and the Drag Wave frequency; correlating the synthetic signal and the first return seismic signal to obtain an image of the extent and location of the subterranean reservoir; and determining a presence of fluid in the image of the extent and location of the subterranean reservoir from the elastic nonlinear interactions of the monofrequency signal propagating through the subterranean reservoir based, at least in part, on a result of correlating the synthetic signal and the first return seismic signal.