Magnetotelluric sounding evidence of development of nappes in the Tuolai Sag, Yin-E Basin

• Autorzy: Penghui Zhang , Hui Fang , Xiaobo Zhang , Yaoyang Zhang , Haihong Xu , Yan Peng , Yongzhen Yuan

Identyfikatory

DOI

10.1007/s11600-019-00378-z

• Języki publikacji: EN

Abstrakty

EN

To explore the tectonic framework and features of stratigraphic distribution in the Tuolai Sag, Yin-E Basin, a 47-km-long magnetotelluric (MT) sounding measurement was performed around Well MAZD1 in the sag. During feld data acquisition, a remote reference technique was used to ensure data quality, with apparent resistivity and phase curves of all measuring points obtained using the Fourier transform, power spectrum selection, robust estimation and other methods. After MT data processing, dimensionality analysis and the degree of two-dimensional deviation indicated that the study area had the dimensionality needed for two-dimensional inversion. The major electrical axis in the sag was determined, using a multipoint–multifrequency point statistical imaging technique, to be in the WNW direction. Within the constraints of the resistivity log data for Well MAZD1, inversion results for TE and TM models were compared, after which the TM model, which corresponded well to geological conditions, was selected for conducting the nonlinear conjugate gradient method inversion and a reliable resistivity model was fnally obtained. Based on regional petrophysical properties, resistivity logging, and near-well bathymetric data, the electrical characteristics of diferent formations within the sag were obtained and a set of low-resistance clastic rock identifed in the lower Carboniferous strata. Based on an integrated analysis of the regional surface geology, tectonic setting, and depositional environment, and within the constraints of gravity to ft with electrical structure, a tectonic framework of two subsags sandwiched by an uplift is proposed for the Tuolai Sag. The scale of the northern subsag is large, with development of pre-Carboniferous nappe as well as of Carboniferous–Permian strata within the lower part of the nappe. The southern subsag is small and flled mainly with Carboniferous–Permian strata.

Słowa kluczowe

EN

magnetotellurics; electrical conductivity; nappe; Yin-E Basin

PL

magnetotelluryka; przewodnictwo elektryczne; płaszczowina

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2020
• Tom: Vol. 68, no. 1
• Strony: 91--104
• Opis fizyczny: Bibliogr. 35 poz.

Twórcy

autor

Penghui Zhang

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

autor

Hui Fang

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

autor

Xiaobo Zhang

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

autor

Yaoyang Zhang

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

autor

Haihong Xu

• Xi’an Geological Survey Center, Xi’an 710000, China

autor

Yan Peng

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

autor

Yongzhen Yuan

• National Research Center of Geo-exploration Technology, Langfang 065000, China
• Key Laboratory of Eelectromagnetic Detection Technology, Ministry of Land and Resources, Langfang 065000, China
• Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)