Even with traditional resources, finding new oil reservoirs is a difficult and expensive task. When working in uncharted, difficult-to-reach areas, exploration and mistake expenses skyrocket. Basin modeling allows for the elimination of a large number of uncertainties prior to the start of field work. Basin modeling entails reenacting the creation and modification of geological layers over millions of years to establish when they first emerged, where they accumulated, and how hydrocarbons were redistributed.
Within the framework of this technology, on the basis of all the available information about the geology of the region, with the help of mathematical and analytical methods, the processes of formation and change of geological layers are recreated, which makes it possible to identify the places of accumulation of hydrocarbons.
Exploration activity is carried out by JSC Gazpromneft MZSM in order to expand the resource base. Advanced exploration techniques and the selection of the most prospective regions based on research results have regularly produced positive results in exploratory activities. JSC Gazpromneft MZSM is working on a series of exploration and experimental projects, as well as measures to develop its own geophysical service. To provide the best monitoring systems for projects in the Moscow area, field seismic modeling methods were introduced.
From the collecting and analysis of seismic data to the generation of dynamic field models for the placement of exploration and production wells, the Company takes a methodical and comprehensive approach to the exploration and development of its fields and licensing regions. To maximize the final recovery of hydrocarbons in a cost-effective and environmentally responsible manner, we use current geology and hydrodynamic modeling, as well as new well drilling and completion techniques. Step-by-step application of sophisticated technology for processing and interpreting seismic data has continued to improve the success of exploration drilling.
The RT Technology 2 wireless radio telemetry data logging system is used in green seismic. The compact logging equipment is supplied to the installation location without the use of heavy machinery, which typically necessitates cutting apertures of at least four meters wide. A 1-1.5 m broad track is sufficient for Green Seismic. As a result of refusing to use the cable, the volume of cut wood is reduced by half, and the information gained is as accurate as standard seismic exploration data.
The second version of the technology is now being tested on the fields of JSC Gazpromneft MZSM . Green Seismic 2.0’s major goal is to narrow the clearings, which are cut not only for the receiving lines but also for the excitation lines. The company’s experts do this by using tiny drilling rigs with a thin chassis. Furthermore, the project team created a slalom-profile technology that allows light vehicles to bend around massive trees, reducing the volume of tree removal even more.
JSC Gazpromneft MZSM initiated the development of a domestic complex for conducting marine seismic studies using bottom stations – the Crab. In addition to JSC Gazpromneft MZSM, the Marine Arctic Geological Exploration Expedition, Marine Technical Center, as well as the RF Ministry of Industry and Trade took part in the project. 2,800 bottom stations, manufactured for the 2019 field season, were used in seismic exploration at the Neptune field located in the Ayashsky license area in the Sea of Okhotsk. 3D 4C studies with the use of KRAB bottom stations on an area of 515 km2 lasted more than four months and became the largest in Russia and the only ones using the 3D 4C method in 2019. At the moment, the project of the new generation stations “Crab 2.0” is being developed. In 2021, it is planned to test them on the Arctic shelf.
High-density electrical exploration
Various electromagnetic methods are widely used at all stages of prospecting, exploration and development of deposits, due to their high efficiency and relatively low cost of work. With a high density of measurement points, modern electrical prospecting actually falls into the category of 3D technologies. In 2019, JSC Gazpromneft MZSM, for the first time in Russia, tested controlled source electrical exploration (CSEM) on a continental asset to find and clarify the boundaries of the productive zone of the Bazhenov reservoir. This method is usually used in offshore fields, but the company’s specialists have been able to adapt it to prospecting onshore.
The method is based on the fact that oil- and gas-bearing rocks usually have higher electrical resistivity compared to water-saturated rocks. On an area of 347 sq. km over 1100 observation points were installed. As a result, the specialists managed to improve the quality of the comprehensive forecast of the productivity of the Bazhenov formation. After analyzing the data obtained, it is planned to use electrical exploration to work with other hard-to-recover reserves.