УДК 550.8::622.691.24
(UDK 550.8::622.691.24)
(GEOLOGICAL BACKGROUND FOR UNDERGROUND GAS STORAGE FACILITIES’ CONSTRUCTION IN MIDDLE AMUR DEPRESSION)
The article considers the geological aspects of the underground gas storage facilities’ construction in the Far East. This is a pressing challenge as PJSC Gazprom plans to develop production facilities in the region, and there is no redundancy system at the existing main gas pipeline. The geological structure of the Far East is markedly different from the regions with existing underground gas storage facilities. In addition, the areas under study are characterized by a low degree of geological and geophysical exploration maturity, which predetermines the lack of prepared structures (underground gas storage facilities).
Within the Far Eastern region, where Sakhalin – Khabarovsk – Vladivostok gas transmission system is operated, the following basins are promising for underground gas storage facilities’ construction: Middle and Lower Amur depressions, as well as Primorskaya group of depressions.
Basement of Middle Amur depression includes crystalline complexes of Khingan-Bureya massive and dislocated rocks of Paleozoic and early Mesozoic age, the sedimentary cover includes terrigenous and volcanogenic-terrigenous sediments of Cretaceous and Cenozoic age up to 3.0 km thick. Natural reservoirs are associated with Paleogene complexes, but they are unstable due to their composition and are discontinuous along strike and at depth.
Basement of Primorskaya group of depressions includes Precambrian formations of Khanka massive and folded Paleozoic and Mesozoic rocks. The sedimentary cover is composed of terrigenous and volcanogenic-terrigenous Mesozoic and Cenozoic sediments. These sites are not considered in the article due to their borderline location and small size.
The most studied site of a Lower Amur group of depressions is Kizi-Lazarevskaya depression, which as per the geophysical data is covered by volcanites and composed of sedimentary and tuffogenic-sedimentary deposits up to 5.0–6.2 km thick. Composition and structure of the latter are unknown, and no local structures were specified. This depression is also beyond the scope of the study due to its remoteness from the gas pipeline and gas consumers.
PJSC Gazprom. Sakhalin – Khabarovsk – Vladivostok gas pipeline. Available from: https://www.gazprom.com/projects/skhv/ [Accessed: 27 November 2022].
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