BOREHOLE-SURFACE SEISMIC SURVEY METHOD Russian patent published in 2025 - IPC G01V1/00 G01V1/40 

FIELD: seismic survey.

SUBSTANCE: invention relates to the field of seismic exploration and can be used in the study of deep objects of isomeric and extended shape by the method of reflected seismic waves. It can be most used in studying underground gas storages (UGS) located in rock salt formations. Method of borehole-surface seismic exploration includes borehole seismic observations by modification of level VSP with location of points of excitation on profiles, fan-like diverging from investigated well and containing points of reception on the same profiles. Simultaneous recording of seismic vibrations inside the medium and in the near-surface zone makes it possible with minimal costs to obtain interconnected time and depth sections, which enable to form a data cylinder, from which sections and sections crossing the investigated deep object are then synthesized. In the case when the studied object has a horizontally elongated shape, due to washing in the rock salt of the gas injection tanks by means of the horizontal wells, at least one of the beam profiles on the earth's surface is directed along the direction of the horizontally elongated reservoir and resonance oscillations generated by this reservoir are recorded. Capacitance cross-section dimensions are determined from the resonance oscillation frequency. Processing of data obtained during integration of well and surface observations using the proposed method is based on information on the velocity model of the medium obtained by processing the investigated well by modifying the longitudinal VSP. This modification makes it possible to reasonably select the depth interval in the well for the VSP probe under the multiple-forming boundaries located in the upper thickness of the geological section, as well as to use a train of incident waves as a reference signal when suppressing multiple reflected waves in borehole and surface observations using the proposed method.

EFFECT: more efficient combination of borehole and surface seismic survey systems and more efficient use of information obtained during operations.

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