DNME onshore technology
DNME onshore observing system can be represented by a profile or area option. Source grounding is done with iron electrodes. For grounding of the receiver station the brass electrodes are used. In winter in the Russian North AB power supply dipole is grounded by wells and drilling depth is 2-3 m. Leach is poured into the holes for best conductivity achievement.
Example of the area data acquisition
In addition we developed unique technology of studying section polarization properties using inductive excitation in conditions of desert and ever frost areas.
DNME works were carried out on the territory of Russia and abroad it. For example, work was carried out in Tatarstan. It was a problem of the prospects of local elevation within the major reef, characterized by the variation of reservoir properties. As a result zones, prospective for the presence of hydrocarbon deposits, were allocated. One of the wells take up position over the reef building trap, which was considered hopeless in relation to oil and gas by seismic data. The presence of deposit is confirmed after drilling, and complex DNME – seismic has been regarded as an effective way for exploration of oil and gas.
The DNME method is applicable in the most different geological and geophysical conditions, including in search of deposits under the halogen-carbonate a show weak conducting complex and in conditions of widespread trap magmatism, in regions of ancient and recent platforms, continental depressions, fore deep and shelf. The results of method do not depend on the types of traps (structural, structural-tectonic, lithological, etc.) and reservoirs (terrigenous, carbonate).
DNME offshore technology
Development of technology of deep-sea surveys began over 15 years ago from measuring system towed on the sea surface. This technologyis effective at depths from 10 to 100 m. In 2015, for LUKOIL in the Caspian Sea for the first time the works were performed with an underwater towed system, sunk to a depth of over 500 meters. And in 2016, a similar works were conducted in the Romanian sector of the Black Sea. At present, the developed method allows to carry out DNME marine works in the sea depths up to 1 km.
IP аnomalies are formed at the level of geochemical barriers, confined to the upper regional impervious layer.
Underwater towed observing system for deep-sea wo r k s
In 2006, Schlumberger conducted a test of the DNME technology on the North-Gulyaevskoe field. As a result of these works geoelectric sections, IP distribution map and resistivity map was constructed. IP anomaly was fixed on the IP section, at the depths corresponding to the upper regional impervious layer.
DNME – result examples (North-Gulyaevskoe field, Barents Sea)
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Application of DNME for geological engineering
Simultaneously with HC deposit exploration DNME technology allows to solve other issues. In the Far North information on areal allocation of permafrost rocks and gas-hydrates accumulations is relevant.
Permafrost rocks thickness map
Permafrost rocks thickness map
Gas-hydrates thickness map
The distribution of the permafrost rocks thickness were obtained on the basis of the DNME works. These data allow us to adjust the velocities in the seismic section and, thus, to correct structural maps. In addition, these data are used in the installation of pipelines.