Аннотация
The article presents an integrated study of the crystalline basement of the Syrdarya sedimentary basin, located at the junction of platform structures and Paleozoic fold belts of the South Tien Shan. The study is motivated by uncertainties in basement morphology and internal architecture due to the absence of direct well data and ambiguous interpretation of regional potential fields. Using integrated interpretation of seismic (CDP, VSP), gravity, aeromagnetic, and magnetotelluric data, a reconstruction of the basement surface was performed, and its block structure, lateral heterogeneity, and physical property distribution were refined. Seismic data provided the main structural framework, while gravity and magnetic data constrained density and magnetic heterogeneities, and magnetotelluric data delineated deep conductive anomalies and potential zones associated with fluid saturation It is shown that the basement occurs at depths of 9–13 km and has a blocky, dissected morphology with vertical offsets up to 2–3 km. No evidence of large-scale rift grabens or classical rift systems is identified. The magnetic field reflects variations in rock magnetization and is not directly linked to the crystalline basement surface. Magnetotelluric results indicate a high-resistivity basement with localized conductive zones associated with tectonic disturbance and potential fluid saturation. The proposed model defines the basement as a consolidated, structurally differentiated, laterally heterogeneous medium formed under intraplate tectonic activation and differential vertical movements. The results refine the geodynamic framework of the basin and improve the assessment of hydrocarbon prospectivity in the Paleozoic complexes of the region.