METHOD OF SEISMIC EXPLORATION Russian patent published in 2012 - IPC G01V1/00 

FIELD: mining.

SUBSTANCE: during seismic exploration seismographs are placed above the explored facility, seismic oscillations are excited in the range of 1-20 Hz, the signal is registered both before and after excitation of seismic oscillations, the seismic background is used as the seismic signal, deposit availability is identified by increased area under the curve of the mutual spectrum of identical components, when the record of the seismic background after excitation of seismic oscillations is compared with the record before excitation. Seismographs are placed into an isometric figure, linear dimensions of which are commensurable with the depth of exploration, seismographs are installed according to the diagram spread on the area with the distance between them that is less than the half of the length of the reflected wave, seismic excitation is carried out aside from the edge of seismographs installation at the distance commensurable with the depth of exploration during not more than 3 minutes in the continuous mode or 20 strokes in the pulse mode, seismic waves are radiated with registration of oscillations from the moment of radiation during the time providing for recording of the seismic background with duration of at least 3 seconds, repeated seismic excitation is carried out with duration of not more than 100 times higher than the first one, after it the second radiation of seismic waves is carried out with registration of oscillations during the same time period as during the first radiation, one of the proposed productive horizons is selected above the group of seismographs, it is broken into squares with the side equal to 25 m, cophased summation of seismic background tracks is carried out for each square, starting from the time of absence of reflected and other interference waves, the total energy of oscillations is determined for summary tracks, which is referred to the centre of the appropriate squares for the first and second radiation of seismic waves, the energy value from the first radiation is subtracted from energy values from the second radiation, produced differences are referred to the centres of the appropriate squares, using maximum values of energy differences, areas of higher fissuring are identified, tracks of seismic background that correspond to these areas are collected after cophased summation for the first and second radiations, averaged spectra are identified using them for the first and second radiations, availability of hydrocarbon deposits is confirmed with the increased area of spectrum from the second radiation compared to the area of spectrum from the first radiation, upon completion of calculations, work on another horizon is started.

EFFECT: higher accuracy of identification of most fissured sections in the explored horizon and detection of hydrocarbons availability in them.