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Li W.-J.,Institute of Geophysical and Geochemical Exploration IGGE
Wutan Huatan Jisuan Jishu

A frequency domain airborne electromagnetic (AEM) survey collects EM data continuously and forms huge volume EM anomaly. The traditional manual anomaly detection and classification technique can not meet the needs of identification of AEM anomaly. Based on the EM data character of the HDY-402 tri-frequency EM system, and referred to the traditional manual anomaly detection technique and the related technology at home and abroad, this paper introduce the digital methods to detect and classify AEM anomaly. A software was developed and applied to about 423 000 survey kilometer AEM data acquired in the Inner Mongolia using the new technique. Its anomaly detection and classification efficiency and accuracy was validated. Source

Li W.,Institute of Geophysical and Geochemical Exploration IGGE | Xiao D.,Institute of Geophysical and Geochemical Exploration IGGE
Geological Engineering and Mining Exploration in Central Asia - Proceeding Source: The XVIII Kerulien International Conference on Geology, KICG 2013

The iFTEM airborne electromagnetic (AEM) system is a new fixed-wing, towed-bird AEM system which is being developed for conductivity mapping and the detection of mineral at considerable depths. It filled in the gaps in the fields of the time-domain AEM system in China. This paper presents the design philosophy and describes the design features. The system is now in the initial test-flying stages. The iFTEM system has a high power transmitter that the peak dipole moment is about 500,000 Am2 at 25 Hz. The system bandwidth is from 25 Hz to 20 kHz and the EM sensor is a 3 perpendicular dB/dt air-cored coils in towed bird. As the data acquisition unit can recording full-waveform of the 3-component response and Tx current, the multi-components data can be used to do the bird motion compensation and target geometry discrimination. Source

Lu J.-Q.,Institute of Geophysical and Geochemical Exploration IGGE | He M.-X.,Institute of Geophysical and Geochemical Exploration IGGE | Fang H.,Institute of Geophysical and Geochemical Exploration IGGE | Bai D.-W.,Institute of Geophysical and Geochemical Exploration IGGE | And 3 more authors.
Wutan Huatan Jisuan Jishu

The application of magnetotelluric sounding in the north section of the Selincuo - shenza line is introduced in this paper. A preliminary understanding of basin boundary, the basement depth and basic tectonic framework of the Cuoqin basin have been given according to the electrical characteristics. Analysis shows that the region of Selincuo the depth of the basin appears higher in the south and lower in the north, the maximum depth of north-central sag is close to 5 km. The southern uplift of basement buried depth is less than 2 km. The main stratum of this area is Langshan group and Duoni group, and there are multiple faults develop in Cuoqin basin, which control the form of the basin. Source

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