Geology, geography and global energy

Scientific and Technical Journal

MODERN VIEWS ON THE STRUCTURAL PLAN OF SUBSALT DEPOSITS OF THE CASPIAN BASIN

2019. №4, pp. 60-66

Fedorova Nadezhda F. - Ph. D. in Geology and Mineralogy, Associate Professor, Astrakhan State University, 1 Shaumyana Sq., Astrakhan, 414000, Russian Federation, nadezhda.fedorova.59@inbox.ru

The relevance of the work is due to the scientific justification of the modern representation of the distribution and increase of the forecast of oil and gas potential of the subsalt deposits of the South-Western part of the Caspian depression. The aim of the study is to recreate the model of the modern structural plan of the upper and middle Devonian complexes of the Astrakhan arch. This territory is one of the most important oil and gas regions, where huge potential hydrocarbon resources are concentrated. The methodology of the study was carried out on the basis of data processing of field Geophysics materials-seismic exploration and field-geological studies performed during parametric drilling. The author studied the features of distribution and regularities of formation of Devonian deposits in the South-Western part of the Caspian depression. Within the Astrakhan arch during the entire Paleozoic period, it was established that the modern structural plan of Devonian deposits has an inherited character below the underlying complexes. In the study of this issue were used materials of three-dimensional seismic 3D OGT-64 and areal seismic 2D, as well as core and slurry materials according to the drilling of parametric wells. Summary. In the modern structural plan, the surfaces (roofs) of the various tiers of the middle Devonian and upper Devonian departments generally retain their inherited development. Are a series of linearly elongated in the North-Western rhumb anticline zones, anticlines and individual local elevations, having different sizes and amplitudes and separated, as a rule, synclinals, mulds, deflections. The obtained views on the structure of Devonian deposits indicate the need for more rational placement of exploratory drilling and additional seismic studies, both in the South of the left-Bank periphery of the Devonian macrostructure, and in its right-Bank part, as well as in the interfluve of the Volga and Akhtuba rivers in order to clarify the single structural basis.

Key words: Прикаспийская впадина, Астраханский свод, девонские отложения, структурный план, осадконакопление, Caspian depression, Astrakhan arch, Devonian deposits, structural plan, sedimentation

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