多种重磁位场边缘识别方法及在南黄海北部断裂构造识别中的应用研究

doi:10.11720/wtyht.2020.0043

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Abstract

In order to study the contact relationship of geological bodies and the distribution locations and trends of fault structures on the plane in the northern basin of the South Yellow Sea and its adjacent areas, the authors studied the related means used to solve the related geological structures in the study area. The principles of multiple gravity and magnetic potential field boundary detection methods were systematically analyzed, and the gravity data was processed by various methods in the study area. The fault structure was re-identified and re-extracted to study the system of faults and analyze the characteristics of faults, and the tectonic zoning was conducted in combination with seismic data and related geological recognition in the study area. The results indicate that the joint NVDR-Theta, normalized standard deviations and NVDR-THDR, based on the traditional processing methods, are effective methods for dividing faults. The planar characteristics and depth information of the faults can be more quickly, effectively and accurately reflected by the methods in the study area. NE (NNE)-, NW-, nearly EW- and nearly SN-trending fault structures are developed in the study area, which are hierarchical, regional, and different in activity. The NE (NNE)-trending faults form the main structural framework of the area are the main tectonic bodies of the study area. Under the action of long-term severe activity, NE (NNE)-trending faults are distributed throughout the fault area, and are mainly spread in the northern basin and the northwestern area outside the basin, while nearly EW-trending faults are mainly distributed in the central uplift area. The structure and stratigraphic distribution of the foreland basin were formed in the northern basin under the special tectonic stress environment. Six tectonic zones were recognized in combination with the gravity anomalies and seismic data in the study area, which include Luxi uplift, Jiaolai basin, Jiaonan uplift, Qianliyan uplift, the northern basin of the South Yellow Sea, and the central uplift of the South Yellow Sea.

Key words： NVDR-Theta normalized standard deviations NVDR-THDR fault structure gravity anomaly the northern basin of the South Yellow Sea

Received: 03 February 2020 Published: 28 August 2020

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	Wen-Qiang XU
	Bing-Qiang YUAN
	Bi-Liang LIU
	Chang-Li YAO

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Wen-Qiang XU,Bing-Qiang YUAN,Bi-Liang LIU, et al. Multiple gravity and magnetic potential field edge detection methods and their application to the boundary of fault structures in northern South Yellow Sea[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 962-974.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0043 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/962

26]
①—Tancheng-Lujiang fault belt;②—Wulian-Qingdao-Rongcheng fault belt;③—Qianliyan fault belt;④—Jiashan-Xiangshui fault belt;⑤—Jiangshan-Shaoxing fault belt
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Sketch map of the tectonic location of the northern basin of the South Yellow Sea and its adjacent areas^[26]
①—Tancheng-Lujiang fault belt;②—Wulian-Qingdao-Rongcheng fault belt;③—Qianliyan fault belt;④—Jiashan-Xiangshui fault belt;⑤—Jiangshan-Shaoxing fault belt

The map of Bouguer gravity anomaly in the northern basin of the South Yellow Sea and its adjacent areas

Result maps of approaches of Bouguer gravity anomaly in the northern basin of the South Yellow Sea and its adjacent areas
a—the Theta map of Bouguer gravity anomaly;b—the NVDR-Theta of of Bouguer gravity anomaly;c—the NVDR-THDR of Bouguer gravity anomaly;d—the NSTD of Bouguer gravity anomaly

12,26,29,40]
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Determined fault (a) and the results of previous studies (b)&(c)^{[12,26,29,40]}

36])
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The seismic velocity inversion profile of OBS2013-SYS line in the South Yellow Sea Basin(Modified from Wu et al ^[36])

29])
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Seismic geological interpretation profile (modified from ZhangXunhua^[29])

Tectonic division of the study area

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