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Fang H.,Institute of Geophysical and Geochemical Exploration | Fang H.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | Zhong Q.,Institute of Geophysical and Geochemical Exploration | Zhong Q.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources
Geological Bulletin of China | Year: 2013

MT and AMT profiling was conducted in Mangniuhai sag area of Tuquan basin so as to evaluate the potential of oil and gas resources associated with the late Paleozoic and Mesozoic strata. The results of MT and AMT profile survey shows that there are two thick and transverse continuous distribution conductive layers under the volcanic layer at the depth of 800-2000 m and 2000-8000 m, respectively. By combining drilling material and regional geological material, the authors consider that the first conductive layer represents the coal strata of early Jurassic, and the second conductive layer represents the mudstone layer of upper Paleozoic. Based on the results of ground hydrocarbon source rocks survey, it can be predicted that both the conductive layers could contain excellent hydrocarbon source rocks, which means that there exists great potential for detecting the upper Paleozoic and the early Mesozoic hydrocarbon resources in Tuquan basin.


Zhong Q.,Institute of Geophysical and Geochemical Exploration | Zhong Q.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | Fang H.,Institute of Geophysical and Geochemical Exploration | Fang H.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | And 10 more authors.
Geological Bulletin of China | Year: 2013

Through collecting specimens and testing the density, magnetic susceptibility, residual magnetism and resistivity of rocks, the authors found that, during the evaluation of hydrocarbon resources in the oil-gas bearing basin, the real rock physical properties of the exploration targets, especially the electrical parameters, can hardly be obtained by testing specimens conventionally, because the rocks contain too much mudstone and carbonaceous matters. A comparison of the near-well logging model with core and logging curve shows that the near-well sounding technology is an effective method for obtaining the real resistivity value. In combination with physical properties data available, the physical properties of strata and rocks in Wulangai basin and Tuquan basin were arranged statistically, and the histogram of the main strata and physical properties of the study area was established. In addition, the petrophysical characteristics of strata and rocks in the basins were analyzed. The results can provide the basic information for non-seismic geophysical measurements in this area.


Fang H.,Institute of Geophysical and Geochemical Exploration | Fang H.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | Zhong Q.,Institute of Geophysical and Geochemical Exploration | Zhong Q.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | And 8 more authors.
Geological Bulletin of China | Year: 2013

In order to further understand the development of Linxi Formation in Zhalute basin, Inner Mongolia, the authors arranged several magnetotelluric sounding (MT) profiles and audio magnetotelluric sounding (AMT) profiles. The residue thickness, buried depth and distribution of Linxin Formation were calculated based on the MT profile survey, and the results show that the strata of Linxi Formation are developed extensively in the basin, which can be further divided into five secondary segments, i.e., the north depression, the middle uplift, the middle depression, the south uplift and the south depression; among them the middle depression occpies the largest area of about 300 km2. Linxi Formation is well developed in depression zones, covered by early Mesozoic strata which become thinner in the west and thicker in the east, and the thickness of Linxi Formation is estimated to be generally over 1000 m. In combination with other geological and geophysical data, it is held that Linxi Formation in Zhalute basin has great potential for the exploration of hydrocarbon resources, especially for the exploration of unconventional hydrocarbon resources such as shale gas.


Qiu G.-G.,Institute of Geophysical and Geochemical Exploration | Qiu G.-G.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | Pei F.-G.,Institute of Geophysical and Geochemical Exploration | Pei F.-G.,Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources | And 14 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2014

According to South Korean media's comments that the Tianchi volcano in Changbai Mountain is likely to erupt in coming 2 years, we carried out an MT sounding observation profile about 103 km long at Tianchi volcano area for detecting the deep electrical structures. Since the electromagnetic interference from unknown sources is very strong in the research area, we used a number of advanced data processing techniques including remote reference, Robust processing, Rhoplus analysis, impedance tensor decomposition, and a mutual approximate calculation method between apparent resistivity and phase, finally obtained high-quality and more reliable electromagnetic data in the strong interference areas. Then we analysed the two dimensional structural trend and characteristics of induction vector at Tianchi volcano area in Changbai Mountain, using NLCG inversion technique to interpret the inversion data, then compared the inversion results with previous exploration results. The results show that there is an obvious magma channel at the bottom of Tianchi volcano, the magma channel is closed in depth about 5~8 km. At the bottom of the crater, near the north direction about 7 km deep exists an obvious low resistance body, the resistivity is less than 10Ωm, ^W connected with the magma channel. It is inferred that it may be the developing magma chamber in shallow surface. The abnormal region is between stations C07-C09 near the entrance gate of Changbai mountain and between C04-C05 station, there are two obvious nearly vertical low resistivity zones existing in the depth of about 7~17 km, connecting with below low resistance body directly, it is inferred that the low resistivity zone contains the magma. As the depth increases, the crust low resistivity anomaly bodies are widely developed in the depth of 13km to 30km, north to the position of 20 km south from Tianchi volcano, which may be the active magma chamber. Comparing the inversion results with the previous exploration results, the electrical characteristics are overall similar, but locally different. ©, Science Press. All right reserved.

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