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Ermolin E.,National Mineral Resources University | Ingerov O.,PHOENIX GEOPHYSICS LTD | Ingerov I.,AGCOS Inc.
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

The main parameters of isometric conductive 2-D bodies (shape of the body's cross-section, total longitudinal conductivity of the body's cross-section G, depth H, etc.) can be quickly and accurately determined using the frequency response and the vertical cross-section of the tipper. Research carried out by the authors for 3-D and quasi 2-D (ratio of body's length to width L/a (relative length) is 3-80) has shown that the main parameters for these bodies can also be quickly identified. Unlike 2-D bodies, the body's relative length L/a (the ratio of body's length to width) plays a very important role in this case. The authors have proposed a methodology for determining this parameter using characteristic data points of the tipper frequency response. Since values of the parameters for these bodies are strongly dependent on the body's relative length L/a, a technique for introducing corrections is proposed (correction factors) for determining the true values of anomalous body's parameters. Where the body's relative length is decreased, tipper anomalies (induction vectors) are weakened by several orders, thus highlighting the importance of accurate alignment of magnetic field component sensors to their respective axis's during the course of a field survey. Source

Senchina N.P.,St. Petersburg State Mining Institute | Ermolin E.U.,St. Petersburg State Mining Institute | Ingerov O.,PHOENIX GEOPHYSICS LTD | Savichev A.A.,St. Petersburg State Mining Institute
GEOBAIKAL 2014 - 3rd International Geobaikal Conference 2014: Exploration and Field Development in East Siberia | Year: 2014

Exploration of thin ore bodies covered by effusive rock presents a very difficult geophysical task. Goldbored veins prospecting forms are particularly distinct. Detailed modeling completed by the authors showed that 5-component audiomagnetotellurics (AMT) shows a strong potential for completing this tastk. In essence, the 5-component AMT combines two electroprospecting methods: 4-component (Ex, Ey, Hx, Hy) AMT and 3-component (Hx, Hy, Hz) magnetovariational profiling (MVP). The technology was tested in the field using more than 280 stations with 40-meter spacing along 8 profiles in the remote and difficult to survey Chucot region (Russia). Portable multifunctional 5-generation equipment was used. The use of precision tripods for induction magnetic sensor installations allowed for high productivity and low environmental impact of the work. As a result of data interpretation, the authors propose constructing geology of dykes and defusive host rocks, as well as covering them with tuff and lava. The positions of fault zones were determed. The ore zones are detected as a high resistivity zones. It position define at AMT-MVP maps parameters reliably. The resume of this research is the AMT-MVP is a high-effective technology for gold ore exploration in Chucot Region. Precession tripod using to insatiate magnetic sensors is a very important. Source

Senchina N.P.,National Mineral Resources University | Savichev A.A.,St. Petersburg State Mining Institute | Ingerov O.,PHOENIX GEOPHYSICS LTD | Ermolin E.,Mining University | Kozlov A.,Mining University
GEOBAIKAL 2014 - 3rd International Geobaikal Conference 2014: Exploration and Field Development in East Siberia | Year: 2014

Examples of integrated use of geochemical and mineralogical techniques together with electroprospecting survey of the objects with a complex geological structure in Eastern Siberia are considered. Exploring by regional profiles of magnetotelluric sounding in the area of world-class Pb-Zn deposits Ozernoe allowed to map the deep structure, mineralogical and geochemical studies gave the possibility to forecast Au-Ag, Au-Ba, Au-As and Au-Mo-U mineralization in the territory. Local AMTS-profiling revealed flooded fault zone controlling intersecting auriferous quartz-vein bodies. Integration of AMTS, gamma-ray spectrometry and geochemical survey for secondary dispersion halos overlapped on the lake-marsh deposits territories enabled prediction of indigenous sources of alluvial gold-brannerite mineralization. Geological and geophysical studies of volcano-like Patom Crater and his structure showed his complex deep structure characterized by the presence of carbonaceous rock formations-potential generators of methane, permafrost zone of carbonate rocks under the crater is considered as a buffer for the phase transitions of methane hydrate methane and vice versa, which led to the excavation of limestone boulders on the surface the material cone and subsequent subsidence of its central hill. Source

Bazinet R.,PHOENIX GEOPHYSICS LTD | Jacas A.,CSIC - Institute of Materials Science | Confalonieri G.A.B.,CSIC - Institute of Materials Science | Vazquez M.,CSIC - Institute of Materials Science
IEEE Transactions on Magnetics | Year: 2014

We introduce a low-noise fundamental-mode orthogonal fluxgate magnetometer for use in magnetotelluric surveys. The fluxgate makes use of rapidly quenched amorphous wire having vanishing value of saturation magnetostriction constant (λ ≈ 10-7) and displaying ultrasoft magnetic behavior. The design of the fluxgate consists of multiple U-shaped sensor heads where pairs of wire pieces are inserted as core material. The novelty of this system resides in the use of a quadruple sensor head. Digital signal processing with effective electronic noise suppression allows this magnetometer to achieve a noise floor of 0.8 pT/Hz1/2 for frequencies above 10 Hz. The possibilities of in situ application are discussed and guidelines on noise suppression strategies are given. © 2013 IEEE. Source

PHOENIX GEOPHYSICS Ltd | Date: 2001-06-12

electronic geophysical survey equipment, namely, electric field sensors, magnetic field sensors, electronic data recorders, calibration equipment, transmitters and motor generators and battery power supplies, receivers, global positioning receivers with auxiliary timing and synchronization circuitry, data communications circuitry, and auxiliary computers and software for use therewith. geophysical exploration for the oil, gas, geothermal, mining, ground water exploration, and geophysical and geological research industries.

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