METHOD OF DETERMINING EFFECTIVE DEPTH OF FRACTURE-FILLED FLUID Russian patent published in 2020 - IPC G01V1/28 

FIELD: physics.

SUBSTANCE: invention relates to seismic investigations and can be used to determine effective depth of a fracture-filled fluid. Summary: performing seismic waves instrument recording. Obtained data are processed to generate informative oscillation spectra during processing. Seismic monitoring of the fracture zone with sampling frequency of 100 Hz is used to analyse spectra and estimate effective fracture zone geometric dimensions. Data on the sample are processed with frequency of 0.00833 Hz. Spectra of low-frequency microseismic oscillations are plotted. Analysis of the graph of spectral relationships is used to determine the effective length of the fracture zone from the dependence of frequencies and periods of the fundamental mode of resonant oscillations on the length of the fracture. Besides, according to geological-geophysical materials, the main faults are identified in the vicinity of the point of instrumental registration of seismic waves. Surface lengths of the main geological and geophysical material fractures of this territory are compared to the above effective lengths of fracture zones. Among the effective lengths there found is a value which does not correspond to the lengths of the main fractures known from geological-geophysical material. Spectrum of the low-frequency microseismic oscillation spectrum is used to isolate the spectrum-requiring maximum correction for this value and find its period. Effective fracture depth is calculated based on the obtained data.

EFFECT: technical result is determination of effective depth of fracture-filled fluid.

1 cl, 5 dwg