Applying the Tilt depth and Tilt Euler techniques of gravity data to decipher the basement depth in Sichuan Basin, China

• Autorzy: Chen Qing , Dong Yunpeng , Tan Xianfeng , Wang Jiabei , Huang Xiaoyu , Chen Hao

Identyfikatory

DOI

10.1007/s11600-021-00680-9

• Języki publikacji: EN

Abstrakty

EN

The tilt angle (i.e., TDR) provides an efficient way to recognize the horizontal locations of multi-source geological bodies at different depths and inclination angles. The tilt-depth method was initially derived by applying magnetic formulas and used to calculate the depth of magnetic sources. Recently researchers have attempted to extend this method to interpret depths in gravity field data. The tilt-depth method of gravity anomalies (i.e., GTilt-depth) could capture the depth of a buried source effectively, which makes it superior at deciphering the basement relief. Meanwhile, Tilt-Euler deconvolution (i.e., Euler deconvolution of TDR) has been utilized for estimating a source’s position from gridded data automatically, which requires no structural index. However, analytical singularities can be produced when performing inversion with the Tilt-Euler deconvolution owning to the derivatives of TDR being incalculable when the horizontal derivative is zero. The improved Tilt-Euler deconvolution provided an efficient way to eliminate analytical singularities and obtain more stable solutions. The results from the theoretical model show that the GTilt-depth method and improved Tilt-Euler deconvolution could be applied to calculate the buried depths more accurately and effectively. Application of these methods shows that they are able to capture more detailed features, and provide more straightforward and accurate results of depth, than traditional methods. Furthermore, the results obtained from the gravity data in Sichuan Basin show that the basement depth ranges from 3 to 11 km, and 3 to 7 km in the central uplift, which contains a local depression with a depth of 8 km. The basement exhibits a general pattern of “shallow in middle and deep in east and west”, which is consistent with the results revealed by gravityseismic jointly interpreted profile. This research provides a better indication of the basement structure when interpreting the regional geology in Sichuan Basin.

Słowa kluczowe

EN

tilt angle; Euler deconvolution; depth estimation; Sichuan Basin; gravity anomaly

PL

kąt pochylenia; dekonwolucja Eulera; estymacja głębi; dorzecze Syczuanu; anomalia grawitacyjna

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 6
• Strony: 2173--2186
• Opis fizyczny: Bibliogr. 34 poz.

Twórcy

autor

Chen Qing

• Department of Geophysics, Chongqing University of Science and Technology, Chongqing 401331, China

autor

Dong Yunpeng

• State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China

autor

Tan Xianfeng

• Department of Geophysics, Chongqing University of Science and Technology, Chongqing 401331, China

autor

Wang Jiabei

• Department of Geophysics, Chongqing University of Science and Technology, Chongqing 401331, China

autor

Huang Xiaoyu

• Department of Geophysics, Chongqing University of Science and Technology, Chongqing 401331, China

autor

Chen Hao

• College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
• Chongqing 208 Geoenvironmental Engineering Survey and Design Institute Co. Ltd, Chongqing 400700, China

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