重力数据在德令哈地区区域性综合解释中的开发应用研究

doi:10.11720/wtyht.2021.1454

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Abstract

Based on the latest 1∶250 000 gravity data of Delingha area and combined with the relevant known data, the authors carried out the new extraction and inversion interpretation of gravity anomaly. The study shows that the current gravity anomaly characteristics in Delingha area can reflect the basement structure. In this paper, 14 regional fault structures were interpreted by wavelet fault analysis method, and the basement structure of "five depressions and three uplifts" in Delingha area was recognized by the density interface inversion calculation of Parker method. The uplift and depression pattern of the current regional basement in Delingha area was defined, the undulating change and depth of the uplift and depression of the basement were inferred, and the attribution and supplement of some previous achievements were made. The authors hope that the result of this study will play a guiding role in the deep structural analysis, mineralization research and oil and gas resource prediction in Delingha area, especially in the Chaidong basin.

Key words： Delingha area basement depression tectonic unit density interface inversion fault interpretation

Received: 17 September 2020 Published: 29 April 2021

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	Articles by authors
	Jun-Hai MENG
	Long MA
	Jin-Hai WANG
	Li-Ping ZHAO
	Li-Jun WANG
	Qiang FU
	Ming-Hui TONG

Cite this article:

Jun-Hai MENG,Long MA,Jin-Hai WANG, et al. The development and application of gravity data in regional comprehensive interpretation of Delingha region[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 369-378.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1454 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/369

Landscape image map of Delingha area
IV-2-1—middle Qilian magmatic arc(O-D₁); IV-2-2—Danghe Nanshan-Lajishan ophiolitic melange belt (O-S); IV-2-3—south Qilian magmatic arc(O-D₁); IV-2-4—Zongwulongshan-Xiahe-Ganjia continental margin rift(O-P); IV-3—Quanji block; IV-5-1—Tanjianshan magmatic arc(O); IV-5-2—northern Qaidam ophiolitic melange belt(∈-O);IV-6—Qaidam Basin block

Geological map of Delingha area

The formation density statistical results in Eastern Qaidam Basin

Bouguer gravity anomaly in Delingha area

Residual gravity anomaly in Delingha area

Aeromagnetic anomaly in Delingha area

Results of wavelet fracture analysis of gravity anomaly

Second order wavelet fracture analysis results

Interpretation of basement structural units in Delingha area

	布格重力异常特征	航磁异常特征	古地层或岩体出露情况	综合推断基底岩性	$中心平均深度 km$	$主体面积 k m 2$	中心部位	与断裂关系
阿木尼克隆起	高异常	中高异常	未出露	中酸性夹中基性火山岩与新太古界—古元古界变质岩	0.3	1730	阿木尼克附近	主体边界被f12和f13严格控制
黑石山—牦牛山隆起	高异常	中高异常	古元古界地层;局部花岗岩	岩浆岩为主,局部元古宇变质岩	1	1275	黑石山与牦之间,尕旺秀以北约20 km	北部和西部分别被f10-2、f11控制
宗务隆浅隆起带	中高异常	低异常	未出露		3.5	2063	沿宗务隆山东西向分布	南部被f10及f10-2控制
哈克图蒙克—扎哈山—哈尔达吾凹陷	低异常	低异常	二长花岗岩;边缘区域:新元古界地层	新元古界浅变质岩为主,局部花岗岩	7.1	2120	哈尔达吾南西约8 km	北部被f1控制
哈拉湖凹陷	低异常	弱异常	二长花岗岩、花岗闪长岩;边缘区域:新元古界地层	新元古界浅变质岩为主,局部二长花岗岩及花岗闪长岩	7.2	2353	哈拉湖及偏南部区域	北部被f2控制
怀头他拉—布罕芒安凹陷	中异常	中异常	未出露	元古宇深浅变质岩为主,局部沿断裂有侵入岩	5.4	1800	怀头他拉至布罕芒安中间一带	北、西、东部分别被f10-2、f12、f11控制
欧北凹陷	弱异常	低异常	南侧出露古元古界地层	新元古界浅变质岩为主	3.5	275	欧龙布鲁克山北侧	北侧被宗务隆山断裂(f10)控制
欧南凹陷	弱异常	中异常	未出露	新元古界浅变质岩为主	3	200	欧龙布鲁克山与阿木尼克山间	北侧被f12控制

Comprehensive interpretation results of base features

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