METHOD OF SEISMIC PROSPECTING FOR OIL AND GAS FIELDS Russian patent published in 1998 - IPC

FIELD: seismic prospecting for oil and gas. SUBSTANCE: seismic vibrations are excited and recorded by interference systems under continuous profiling. Simultaneously vibrations of induced and inherent seismoacoustic emission in oil and gas fields are recorded. Quasi-harmonic signals of induced seismoacoustic emission in frequency range from 1.0 to 10.0 Hz are isolated from recorded seismic wave field, amplitude, frequency and time of arrival of isolated quasi-harmonic signals in sliding time window of analysis are measured. Value of time window is found by formula , where T_i is time interval of sliding window; f_i is predominant frequency of quasi-harmonic signals of induced seismoacoustic emission. Obtained information is used to judge presence of oil and gas pools, depth and outlines of oil and gas pools are determined by time of recording of signal of induced seismoacoustic emission maximal in amplitude and by velocity characteristic of section. EFFECT: improved authenticity of method. 1 dwg