Oil and gas potential of the Devonian carbonate complex in the North of the Orenburg region

UDK: 553.98
DOI: 10.24887/0028-2448-2020-10-20-24
Key words: L.A. Nikolaeva (SamaraNIPIneft JSC, RF, Samara), E.V. Filippov (SamaraNIPIneft JSC, RF, Samara), S.A. Polivanov (SamaraNIPIneft JSC, RF, Samara)
Authors: L.A. Nikolaeva (SamaraNIPIneft JSC, RF, Samara), E.V. Filippov (SamaraNIPIneft JSC, RF, Samara), S.A. Polivanov (SamaraNIPIneft JSC, RF, Samara)

Currently reserve replacement is one of the key challenges in the oil industry. The discovery of a number of deposits confined to single Upper Devonian reefs indicates the need for a detailed study of such objects. In the article the North Kinel homocline is considered as the most potential area for this kind of deposits. Detailed research is complicated because of the area is underexplored by modern 3D seismic exploration, it covers only local areas, moreover the area is also unevenly explored by conventional 2D seismic survey. Insufficient knowledge makes necessary to continue geological exploration with forecasting the discovery of new oil reserves.

The article provides a detailed characteristic of the tectonics of the area under consideration, describes the model of sedimentation of the Upper Devonian formation, clarifies the lithological and stratigraphic features. Many local uplifts controlling deposits in the Carboniferous section are rootless and are absent in the underlying sediments of the terrigenous Devonian. Such uplifts are identified with the structures of differential compaction that formed over the Upper Devonian reefs. In the course of the work, a detailed analysis of the oil and gas potential of the reservoirs in the area under consideration was carried out, a description of their reservoir rocks and seals was given. The covers of reservoirs in the Famennian stage are developed everywhere, which indicates the prospects for these deposits. In the course of the performed analysis, the entire existing stock of wells that penetrated the Devonian formation was worked out. As a result of the assessment of well data, a research base was formed, which makes it possible to determine the priority areas of exploration. It is recommended to plan the top-priority areas of geological exploration relying primarily on 3D seismic exploration taking into account recently discovered deposits and fields in the northeastern and northeastern regions.

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