STATIC CORRECTIONS CALCULATION METHOD Russian patent published in 2020 - IPC G01V1/36 G01V1/28 G01V3/08 G01V11/00 

FIELD: physics.

SUBSTANCE: invention relates to a complex of geophysical survey methods, which includes seismic exploration by reflected waves method of the common depth-point (RVM CDP) and electrical survey by shallow sounding by the formation of a near-field field (sSNFF), and can be used to account for high-speed anomalies of upper part of section (UPS). Disclosed is a method of determining static corrections, including excitation of a seismic signal, recording a wave pattern of a seismic field, processing and interpretation of the obtained data, conducting additionally on combined electric exploration profiles to study the structure of the upper part of the section in the low velocity zone. Change of electromagnetic field is recorded, at the same time electric exploration is performed by means of near-depth probing by field formation in near zone by high-density observation networks. After the low-depth probing data are processed, formation of the field in the near zone is used to perform inversion of the obtained data. Based on the inversion results, the longitudinal electrical resistance is determined, then the obtained data are used to identify single stratigraphically linked geoelectric complexes, structural interpretation of upper part of section is carried out and geoelectric model of upper part of section is built. Then, using Faust's empirical relationship, coefficients of which are determined based on well geophysical studies or vertical seismic profiling data, geoelectric models obtained by inversion of shallow probing data by field formation in the near zone are recalculated into acoustic models. Obtained acoustic models are used to construct a velocity cube of the upper part of the section, from which static corrections are calculated for subsequent use in processing seismic survey data of the method of reflected waves at a common depth point.

EFFECT: technical result is high accuracy, information value of the method of determining static corrections owing to taking into account local heterogeneities of the structure of UPS in the thick zone of permafrost rocks (PFR) up to 600 m.

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