Potential of the Achimov Formation was evaluated in one milliard tonnes of oil
15:50 21 января 2019
Категории: News in English
The zonal conceptual geological model of sediments of the Achimov Formation in Noyabrsk region was created in the scientific and technical center of “Gazprom Neft”.
The work unprecedented by the amount was completed in record time — less than 7 months. The final estimate of the region’s resources in the optimistic version made about 1 milliard tonnes of oil.
At the end of last year “Gazprom Neft” created the first digital model of the Achimov formation, having identified 10 promising zones with resource potential exceeding 34 milliard tonnes of hydrocarbons. Specification of the model in Noyabrsk region is the next step in the study of resources of the Achimov Formation.
The model of Noyabrsk region covered 20 western license areas of the company “Gazpromneft-Noyabrskneftegaz” with the area 15 thousand 500 square kilometers, as the corporate communications department of the company reports. The data for modeling were obtained in the course of studies of different specialization. First the specialists performed linkage of the study area with regional structures of sedimentary rocks formed in ancient times within change of the sea line. Then they conducted seismic correlation of 30 independent layers in the study area and built the tectonic model. At the same time, the data on the interval of the Achimov Formation obtained within petrophysical studies of more than 400 wells in the region were updated. Special studies of logging and core material were fulfilled for each well. The received results were combined in the models of geological structure of all 30 layers.
In total more than 300 local objects were identified on the study area, more than 200 of them are promising for search, exploration and development of hydrocarbons. Due to the detailed study and consideration of all potential prospects, the estimated resource base of the Achimov Formation in Noyabrsk region was 4 times increased in comparison to the previous estimates and made about 1 milliard tonnes of oil. At that, potentially profitable reserves and resources make 70% of the resource base.
“Within the performed work the specialists of the unit of engineering and functional support of geological exploration managed quickly to understand the geological structure of the study area, to form the program of further study, to assess the resource base and the potential of the identified reserves. Confirmation of pre-conditions (laid down in the concept) with actual data and study of quality of these reserves should be the next logical step. The specific list of activities will be formed by specialists of “Gazpromneft GEO” and “Gazpromneft-Noyabrskneftegaz”, as the Executive Director for Engineering and Functional Support of Geological Exploration and Resource Base Development Vadim Shashel said.
“The work fulfilled by the geology function updates the task on the broader assessment of prospects of the assets being on the third and fourth stages. Well-established infrastructure and good level of exploration of mature extractive fields in the south of Yamal allows already today with high profitability to extract oil of the Achimov Formation, which was considered not recoverable 7-8 years ago. Introduction and replication of technologies for receiving of oil from unconventional reservoirs in the very near future will become the main drivers for increase in production of “Gazprom Neft-Noyabrskneftegaz”, the director general of the company Alexander Shushakov said.
The Achimov Formation includes layers located in the lower part of Cretaceous deposits practically directly above the Bazhenov Formation (a group of rock formations in Western Siberia lying at depths from two to three kilometers). On the territory of Noyabrsk region the Achimov Formation is represented with deep sea and slope sediments. Achimov layers are characterized with complex geological structure, what requires using technologically complex methods in development of these reserves.