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THE GRAVITY FIELD POWER SPECTRUM AND THE DEEP STRUCTURE OF THE AJINOUR REGION (AZERBAIJAN)
Geology and Geophysics Institute, Ministry of Science and Education of the Azerbaijan Republic
Journal: Geophysical research
Tome: 25
Number: 1
Year: 2024
Pages: 57-68
UDK: 550.831.015.072
DOI: 10.21455/gr2024.1-4
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Kadirov
A.H A.H. THE GRAVITY FIELD POWER SPECTRUM AND THE DEEP STRUCTURE OF THE AJINOUR REGION (AZERBAIJAN)
// . 2024. Т. 25. № 1. С. 57-68. DOI: 10.21455/gr2024.1-4
@article{Kadirov
A.HTHE2024,
author = "Kadirov
A.H, A. H.",
title = "THE GRAVITY FIELD POWER SPECTRUM AND THE DEEP STRUCTURE OF THE AJINOUR REGION (AZERBAIJAN)
",
journal = "Geophysical research",
year = 2024,
volume = "25",
number = "1",
pages = "57-68",
doi = "10.21455/gr2024.1-4",
language = "English"
}
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Keywords: power spectrum, Spector-Grant method, Hartley transformation, Butterworth filter, gravity anomaly, Ajinour region
Аnnotation: The results of the study of gravity anomalies using numerical methods and the deep structure of the Ajinour re-gion with expected oil and gas potential are presented. The analysis of gravitational field anomalies was carried out using the Hartley transformation and the Butterworth filter. The deep position of the masses creating the anomaly was calculated using the Spector–Grant method based on the values of the gravitational field power spectrum.
The results of studying the power spectrum of the gravitational field made it possible to determine the frequency (wave number) of the cutoff and the average depth of the sources of gravitational anomalies. It was revealed that the geodensity boundaries that create gravitational anomalies in the studied region are located at the depths of 5 and 18.5 km.
The regional and local components were identified using high-frequency and low-frequency filtering of gravitational field and compared with the results of geophysical seismic observations. It was assumed that the boundary forming local anomalies is located on average at the depth of 5 km and is associated with the surface relief of Mesozoic deposits. This is independently confirmed, since according to seismic exploration and drilling data in the Ajinour region, Mesozoic deposits occur at a depth of 5–6 km.
An analysis of the gravity anomalies in the study area reveals that there are no pronounced anomalies such as the Ismayilli maximum and the Middle Goychay protrusion throughout the Alazan-Ayrichay minimum zone. Although there are morphological signs of quite numerous weaker anomalies, manifested as distortions in the isolines on the gravity map.
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Bracewell R., The Hartley Transform, New York, Oxford University Press, 1986, 160 p.
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Gadirov V.G., Primenenie gravi-magnitnoj razvedki pri poiske neftegazonosnyh struktur v Kurinskoj vpadine Azerbajdzhana (The use of gravity-magnetic exploration in the search for oil and gas bearing structures in the Kura depression of Azerbaijan), Baku, Pravo, 2010, 224 p. [In Azerbaijani].
Gadjiev R.M., Glubinnoe geologicheskoe stroenie Azerbajdzhana (Deep geological structure of Azerbaijan), Baku, Azerneshr, 1965, 200 p. [In Russian].
Geologija Azerbajdzhana. T. II, Fizika Zemli (Geology of Azerbaijan. Vol. II, Earth physics), Baku, Nafta-Press, 2015, 372 p. [In Azerbaijani].
Hajizade F.M., Geologicheskoe stroenie i neftegazonosnost' Srednekurinskoj vpadiny Azerbajdzhana (Geologi-cal structure and oil and gas potential of the Middle Kura depression of Azerbaijan), Baku, Adiloglu, 2003, 380 p. [In Azerbaijani].
Huseynov B.B., Salmanov A.M., Magerramov B.I., Neftegazogeologicheskoe rajonirovanie na territorii Azerbajdzhana (Oil-gas-geological zoning on the territory of Azerbaijan), Baku, Mars Print, 2019, 309 p. [In Azerbaijani].
Kadirov F.A., Application of the Hartley transform for interpretation of gravity anomalies in the Shamakhy–Gobustan and Absheron oil-and gas-bearing regions, Azerbaijan, Journal of Applied Geophysics, 2000, vol. 45, pp. 49-61.
Kadirov F.A., Gravitacionnoe pole i modeli glubinnogo stroenija Azerbajdzhana (Gravity field and models of the deep structure of Azerbaijan), Baku, Nafta-press, 2000a, 112 p. [In Russian].
Kadirov F.A., Filtering of gravity data using the Hartley transform: A case study of the Kura intermontane trough, Izvestiya. Physics of the Solid Earth, 2000b, vol. 36, no. 10, pp. 866 871.
Kamto P.G., Lemotio W., Tokam A.K., Yap L., Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Explora-tion, International Journal of Geophysics, 2021, vol. 2021, pp. 1-14. DOI: https://doi.org/10.1155/
2021/5554528
Keith J.J., The Regularized Fast Hartley Transform. Low-Complexity Parallel Computation of the Fast Hartley Transform in One and Multiple Dimensions, Switzerland, Springer Nature, 2021, 320 p. DOI: 10.1007/978-3-030-68245-3
Mamedov S.G., Application of high-precision gravimetry in mapping the surface of Cretaceous deposits in the eastern part of the Srednekurinskaya Depression, Azerbajdzhanskoe neftjanoe hozjajstvo (Azerbaijan Oil Industry), 1980, no. 10, pp. 16-20. [In Russian].
Muhathir M., Muliono R., Khairina N., Harahap M.K., Putri M.A., Analysis Discrete Hartley Transform for the recognition of female voice based on voice register in singing techniques, Journal of Physics: Conference Series, 2019, vol. 1361, pp.1-7. DOI: 10.1088/1742-6596/1361/1/012039
Nikitin A.A., Teoreticheskie osnovy obrabotki geofizicheskoj informacii (Theoretical foundations of geophysi-cal information processing), Moscow, Nedra, 1986, 342 p. [In Russian].
Sadigova G.R., Gravitational anomalies of the South-eastern Caucasus, Geofizicheskij zhurnal (Geophysical Journal), 2020, vol. 42, no. 2, pp. 138-151. [In Russian]. DOI: 10.24028/gzh.0203-3100.v42i2.2020.201746
Spector A., Grant F.S., Statistical models for interpreting aeromagnetic date, Geophysics, 1970, vol. 35, no. 2, pp. 293-302.
Tsimelzon I.O., Amiraslanov T.S., Geological efficiency of gravity exploration in combination with magnetic and seismic exploration in the study of the Mesozoic deposits tectonics of the Middle Kura depression (on the example of the Amirarkh-Laki-Udzhary square), Azerbajdzhanskoe neftjanoe hozjajstvo (Azerbaijan Oil Industry), 1981, no. 7, pp. 17-22. [In Russian].
Yusifov Kh.M., Aslanov B.S., Neftegazovye bassejny Azerbajdzhana (Oil and gas basins of Azerbaijan), Baku, Mars Print, 2018, 324 p. [In Azerbaijani].
Yusifov Kh.M., Suleymanov A.M., Geologicheskie osnovy poiska nefti i gaza v mezozojskih otlozhenijah Azerbajdzhana (Geological bases of search for oil and gas in the Mesozoic deposits of Azerbaijan), Baku, Mars Print, 2015, 308 p. [In Azerbaijani].
