GRAVITY FIELD TRANSFORMS AT THE EXPLORATION FOR HYDROCARBON FIELD IN THE SOUTHERN PART OF THE USTYURT REGION
Abetov A.E. Yessirkepova S.B. Ma J.C.
2022National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022#3Issue 45317 - 31 pp.
The article discusses the results of the interpretation of gravity survey data in the southern part of the Ustyurt region in order to identify zones and areas heterogeneous in terms of the density properties of rocks. An attempt was made to relate the nature of the distribution anomalous gravity field with areas potentially productive for the discovery of hydrocarbon (HC) accumulations. To this end, the following transforms were calculated: modules of vertical and horizontal potentially productive of Bouguer anomaly, local gravity anomaly (recalculated in the upper half-space at a height of 2.5 km), anisotropy transform, the accent of maximum gravity anomaly and Euler points. The distribution of Euler points clearly demonstrates different depths of bedding of gravitational-disturbing boundaries in the crust of the Central Ustyurt dislocation system, the Shakhtakhty step and the Assakeaudan depression. The depths of the latter are observed to coincide with the reflecting boundaries according to common depth point (CDP)-2D seismic data (surfaces of pre-Jurassic rock complexes, basement, and boundaries in the sedimentary cover). A high total thickness of the sedimentary cover and pre-Jurassic rock complexes of the Shakhpakhty step has been established. This statement is confirmed by the airborne gamma-ray spectrometer (radiometric) data, processed and interpreted by the thorium normalization method, as well as the results of interpretation and modeling of the aeromagnetic survey data. The results of the integrated interpretation of gravity and magnetic field transforms, airborne gamma spectrometry and seismic CDP-2D data unambiguously indicate the prospects of oil-and-gas bearing of the local structures at the Shakhpakhty step with due regard for favorable historicalgeological, structural and lithofacies factors.
Bouguer anomaly , density model , gravity survey , transforms
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Kazakh National Research Technical University named after K.I. Satpayev, Almaty, Kazakhstan
University of Brasilia, Brasilia, Brazil
Kazakh National Research Technical University named after K.I. Satpayev
University of Brasilia
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