Sedimentation features of reservoir formation and leakage assessment of the Galmaz underground gas storage
DOI:
https://doi.org/10.24028/gzh.0203-3100.v42i6.2020.222301Keywords:
3D seismic cube, lithology cube, reservoirs, seismic signal length, seismic resolutionAbstract
The performed complex interpretation of the data of three-dimensional seismic exploration and geophysical study of wells (GIS) using the results obtained from the analysis of core material by laboratory and experimental methods, making it possible to identify paleo conditions for the formation of objects with collector and screening properties on the Galmaz area. The results of the study, which revealed the lithological features of the structure of natural reservoirs, served as the basis for assessing the reservoir properties of the reservoirs and the tightness of the shielding horizons, to which the Galmaz underground gas storage is confined. According to the authors, in the formation, which was in operation for a long time (1960—2006), the Galmaz gas field was mainly played by the eruptive channels of the mud volcano of the same name. At the same time, the maternal strata of the Oligocene—Miocene were the gas-generating source. The results of a comprehensive interpretation of seismic data and well logging showed that confined deposits to reservoirs of the productive stratum (PT-I), Akchagyl and Apsheron are communicated through eruptive channel of a mud volcano. Tire layers, represented by transgressive clays accumulated in shelf conditions, are reliable enough for storage of gas by covers.
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