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Passive seismic data processing methods to identify contrast intrasalt interlayers in the geological section of the Astrakhan Arch

E.V. Biryaltsev, A.A. Vikhоreva, V.A. Zakharchuk, A.Yu. Komarov, V.V. Pykhalov, O.V. Tinakin

Original article

DOI https://doi.org/10.18599/grs.2021.3.14

109-117
rus.

open access

Under a Creative Commons license
The article examines the problem of processing microseismic noise (MN) to identify and evaluate occurrence depth of contrasting geological objects – intersalt interlayers with a potentially high formation pressure. If it is impossible to use artificial wave sources, statistic processing of passive seismic data becomes critical. Due to the accumulation of power spectral density (PSD) during a long-term recording of MN the deterministic medium effect on a random signal spectrum is identified. PSD modulation when the surface or the bottom of the layered medium is exposed to white noise is expressed in terms of the Green’s function (GF) of a wave equation. Relevant GF variations corresponding to the layers form the basis for accumulated PSD approximation, and indicate the depth and contrast of the target features.
 
hydrodynamically isolated layers, intersalt interlayers, formation pressure, passive seismic, low-frequency seismic sounding, microseismic noise, Green’s function of a wave equation, power spectral density, collection of statistical information, maximum likelihood method
 
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Evgeny V. Biryaltsev
Gradient Technology LLC
Of. 516, 50, Petersburgskaya St., Kazan, 420011, Russian Federation

Alexandra A. Vikhoreva
Octopus LLC
10A, Gub. A. Guzhvin Av., Astrakhan, 414014, Russian Federation

Vasily A. Zakharchuk
Gazprom Dobycha Astrakhan LLC
30, Lenin St., Astrakhan, 414000, Russian Federation

Alexey Yu. Komarov
Gazprom Dobycha Astrakhan LLC
30, Lenin St., Astrakhan, 414000, Russian Federation

Viktor V. Pykhalov
Octopus LLC
10A, Gub. A. Guzhvin Av., Astrakhan, 414014, Russian Federation

Oleg V. Tinakin
Gazprom Dobycha Astrakhan LLC
30, Lenin St., Astrakhan, 414000, Russian Federation

 

For citation:

Biryaltsev E. V., Vikhоreva A. A., Zakharchuk V. A., Komarov A. Yu., Pykhalov V. V., Tinakin O. V. (2021). Passive seismic data processing methods to identify contrast intrasalt interlayers in the geological section of the Astrakhan arch. Georesursy = Georesources. 23(3), pp. 109–117. DOI: https://doi.org/10.18599/grs.2021.3.14