Gas potential of Senonian deposits in the north of Western Siberia

Alexander S. Perezhogin LLC "Gazprom geologorazvedka" Tyumen, Russian Federation a.perezhogin@ggr.gazprom.ru
Alexey A. Nezdhanov LLC "Gazprom geologorazvedka" Tyumen, Russian Federation a.nezhdanov@ggr.gazprom.ru
Alexander S. Smirnov LLC "Gazprom geologorazvedka" Tyumen, Russian Federation a.smirnov@ggr.gazprom.ru
Due to the depletion of the significant part conventional reserves of Cenomanian gas deposits in the north of Western Siberia (WS) there was a need to find new, alternative gas production facilities. One of such promising facilities are Senonian deposits from which PJSC "Gazprom" managed to get industrial gas inflows on Medvezhie oil-gas condensate field. Regional structural features and gas-bearing Cenomanian deposits are considered. A technique for mapping Senonian gas deposits increased productivity zones by CDP seismic data 2D and 3D using dynamic analysis,time thickness detailed analysis and fracture mapping. The effectiveness of a technique is proved by the example of Medvezhie Field. Using of this technique in complex with shale technologies will allow ultimately maintain the level of gas production in the fields of PJSC "Gazprom" in WS with declining production of Cenomanian gas.
Materials and methods
Well and CDP seismic 2D and 3D data on the license areas of PJSC "Gazprom" in Western Siberia, seismostratigraphic analysis, field-geological research.
Results
In this paper it is proved that gazsalinsk member and russko-rechenskaya stratum form a single sedimentary body. Were also refined distribution limits and age range of the gas gazsalinsk member. Defined pool outline of Senonian gas deposits in a number of fields in the Yamal-Nenets Autonomous District. The method of the forecast production zones Senonian gas deposits based on tectonic and diagenetic fracturing clay-siliceous reservoirs and the results of detailed analysis of time thickness. According to the study selected coordinates laying prospecting and appraisal well, which gave commercial gas inflow from the Senonian deposits.
Сonclusions
The results of the research show a significant potential gas-bearing Senonian complex north of Western Siberia. They are used for the preparation of the geological exploration project on Senonian deposits Medvezhieoil-gas condensate field. Application of high-density 3D seismic CDP for the study of dynamic anomalies, detailed analysis of the time thickness and mapping zones of intense fracturing has allowed to choose the best sites for laying special Senonian wells and select their trajectory. Using of this technique in complex with shale technology will allow, ultimately, maintain the level of gas production on the fields of PJSC "Gazprom" in the WS with declining production of Cenomanian gas.
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сейсморазведка МОГТ3D Western Siberia the Yamal-Nenets Autonomous District gas Senon 3D seismic CDP time thickness clay-siliceous res