STRUCTURE OF THE GRAVITATIONAL FIELD AND GRAVITY-DISTURBING OBJECTS OF THE SOUTH TORGAY SEDIMENTARY BASIN
Структура гравітаційного поля та гравізбурюючі об’єкти Південно-Торгайського осадового басейну
Abetov A.E. Mukanov D.B.
2025Natsionalnyi Hirnychyi Universytet
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu
2025Issue 213 - 25 pp.
Purpose. Study of the distribution of density heterogeneities at various slices of the Earth’s crust in the South Turgay sedimentary basin (STSB). Identification of the correlation relationships of these heterogeneities with the structure, geodynamic processes, and tectonic evolution of this basin. Methodology. Geological interpretation of regional, intracrustal, and local gravity field anomalies, incorporating data from seismic and magnetic surveys, geothermal studies, and neotectonic dislocations. Findings. The spatial distribution of density heterogeneities at different lithospheric slices of the STSB has been identified, along with the locations of gravity-disturbing mass centers, as well as the extent, shape, and intensity of anomalous bodies and their burial depths. In the depth range of 30–150 km, a pronounced block heterogeneity of the STSBs lithosphere is observed, revealing significant differences in the intensity, morphology, polarity, orientation, and gradient variations of the transformed gravity anomaly (Δgreg) compared to the adjacent areas of the Lower Syrdarya Horst and the Shu-Sarysu Depression. At depths of up to 25–30 km in the consolidated crust, manifestations of horizontal shear deformations have been established, along with the internal structure and contrast of intra-crustal interblock boundaries. No significant differences between the STSB and the Lower Syrdarya Horst have been identified in the intra-crustal gravity transform field, while distinctions from the Shu-Sarysu Depression have been observed. At depths of up to 7 km, local gravity-disturbing objects show a clear correlation with the depth to the top of Paleozoic formations, effectively tracing fold belts concealed beneath Mesozoic-Cenozoic deposits Originality. For the first time, assumptions have been made for the region about significant differentiation in the depths and ages of major faults, which indicates amplitudes of shifts at the level of regional, intracrustal and local heterogeneities of the lithosphere. At the base of the earth’s crust of the STSB along the Moho discontinuity, a trough is recorded, under which an active mantle zone is observed, increased horizontal gradients of the base of the earth’s crust are fixed. A unique geological phenomenon has been revealed, according to which the main geonomic boundaries of the earth’s crust are conformable, which clearly confirms the rift nature of the STSB. Practical value. The obtained data can be utilized for developing new approaches to geological exploration, its planning and assessing the oil and gas potential of the STSB; as well as to optimize the location of exploration and appraisal wells and design wells targeting new oil and gas prospective formations within the complexes of the quasi-platform structural level. The research results will contribute to a better understanding of the distribution patterns of deep-seated density, structural, geomagnetic, and geothermal heterogeneities at various levels of the lithosphere, their correlation with modern tectonics and the geological evolution history of the STSB. Moreover, they can serve as a foundation for future scientific research aimed at studying geodynamic processes in this basin as well as for adapting the proposed methodology to other oil and gas basins.
geothermal studies , gravitational field , heterogeneities of the lithosphere , magnetic surveys , neotectonic dislocations , seismic surveys , transformants
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Satbayev University, Almaty, Kazakhstan
Satbayev University
10 лет помогаем публиковать статьи Международный издатель
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