METHOD OF GEO-PHYSICAL PROSPECTING OF OIL AND GAS DEPOSITS Russian patent published in 2010 - IPC G01V1/00 

FIELD: mining.

SUBSTANCE: there are excited seismic waves; further they are recorded along traverse network of not less, than two crosses in boundaries of expected object. There is used a combined arrangement of groups of seismographs adjusted to simultaneous recording of two various types of waves: ascending reflected ones - for reflecting time sections of common depth point and speed model of a section and waves of seismic fluorescence of oil and gas deposits. To record the first type of waves there are used standard parametres of seismograph group arrangement with maximal explosion-instrument removal equal or exceeding 1500 m and a step between centres of seismograph groups up to 50 m. To record the second type of waves there is used arrangement with maximal explosion-instrument removal 800 m and a step between centres of seismograph groups not more, than 10 m. There are registered amplitude, frequency and time of seismic waves coming from a common source with one or two parallel seismic stations. Spectral densities for sequence of unit values of frequency are calculated at processing data obtained from the second arrangement of seismographs with consideration of data processing results from the first arrangement. A conclusion on presence of oil and gas deposit is drawn in case of establishing correlation relationship of abnormal high values of calculated amplitudes for sequence of homonymous values of frequency on several crossing sections in crossing points, while there is observed a condition A/Ā≥3 in vicinity of crossing points of profiles (A is current value of amplitude, Ā is average value of amplitude calculated along profile in a specified time interval).

EFFECT: upgraded reliability at reduced time for oil and gas deposits prospecting.

2 dwg