根据重力资料定性与定量解释银川平原断裂体系

doi:10.11720/wtyht.2019.1149

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Abstract

The Yinchuan plain is a region of active faults which are closely related to earthquake disasters. The study of active faults in the Yinchuan plain is of great significance for the development of the city. In this paper, the gravity anomaly characteristics of the area are analyzed and the fracture system is divided by the method of gravity boundary recognition based on the re-processing of 1∶200 000 Bouguergravity anomaly data of the Yinchuan plain. The quantitative inversion of the 83503 line section of the study area is carried out by using the method of fracture parametric graph, the Euler homogeneous equation, the optimal inversion and the 2.5D inversion. The inversion results and the seismic interpretation are coincident. Using the existing gravity data, the authors probed into the method of interpreting the plane fracture system and the quantitative inversion of the section fracture and, as a result, some new understanding was obtained such as the north extension of the Yinchuan fault and westward migration of a part of Yellow River fault. The result provides a new reference for the research on active faults.

Key words： Yinchuan plain gravity data boundary recognition quantitative inversion of fracture active fault

Received: 08 April 2018 Published: 20 February 2019

P631

Corresponding Authors: Yu-Shan YANG E-mail: samyys@126.com

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	Cheng LIU
	Yu-Shan YANG
	Tian-You LIU
	Dan ZHU
	Bai-Zhou AN

Cite this article:

Cheng LIU,Yu-Shan YANG,Tian-You LIU, et al. Qualitative and quantitative interpretation of fracture system in Yinchuan plain based on gravity data[J]. Geophysical and Geochemical Exploration, 2019, 43(1): 28-35.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1149 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I1/28

Regional geology of Yinchuan plain (from Regional geology of the Ningxia Hui Autonomous Region)
1—Holocene and Pleistocene;2—Miocene;3—Oligocene;4—Cretaceous;5—Jurassic;6—upper Triassic;7—middle Triassic;8—lower Triassic;9—Permian;10—lower Permian and upper Carboniferous;11—Carboniferous;12—Ordovician;13—Cambrian;14—Proterozoic quartz diorite;15—main fracture;16—the Yellow River

Local gravity anomalies and major geological structural information in Yinchuan plain
F₁—Helanshan fault;F₂—Luhuatai fault;F₃—Yinchuan fault;F₄—the Yellow River fault

Theoretical step model recognition results of boundary recognition methods
a—gravity anomaly of theoretical step model;b—THDR;c—TA;d—TA-THDR;e—TA-(θ map)

Comparison and analysis of common boundary recognition methods

The gradient inversion method coordinates and the map of Elliptical parameter.

Division and correlation of faults in Yinchuan plain (according to the TA-θ map. The red lines represent the faults changed from Changqing Petroleum Exploration Bureau,the blue lines are the result of this paper)
F₁—Helanshan fault;F₂—Luhuatai fault;F₃—Yinchuan fault;F₄—the Yellow River fault;F₅—the IV class faults

Gravity extended section of line 83503

Gravity quantitative inversion of Yinchuan fault 25 000~37 000 m
a—inversion result of Yinchuan fault parameter diagram;b—analysis of relationship between structural index and top depth of step model;c—inversion results of each method in Yinchuan fault

2.5D inversion result of gravity extension line and seismic profile of line 83503
a—2.5D inversion result of line 83503 gravity extension line(the black solid line is the measured anomaly) and the red dashed line is the fitting anomaly;b—seismic reflection profile of line 83503

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