羌塘盆地白云湖凹陷航空重磁异常特征及其油气勘探意义

doi:10.11720/wtyht.2024.1339

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Abstract

Airborne gravity-magnetic data are effective in revealing the deep structures of a basin.Based on the latest airborne gravity-magnetic data,combined with field-measured physical property data,this study expounded the characteristics and geological origin of airborne gravity-magnetic anomalies present in the Baiyunhu sag.Using the airborne gravity-magnetic data,this study identified the distribution of faults and magmatic rocks in the Baiyunhu sag.Furthermore,it calculated the burial depth of the magnetic basement and the structural morphologies of the Mesozoic basement in the sag using the artificial tangent method, power spectrum analysis method,and Parker-Oldenburg iterative inversion algorithm.Additionally,this study verified the structural stratification results through the integrated interpretations of gravity and magnetism in target sections.The findings suggest that the undulations of the Mesozoic and Paleozoic sediments in the Baiyunhu sag are the primary cause of gravity anomalies,while the regional airborne magnetic anomaly primarily reflects the distribution features of the Precambrian basement.The deeply buried basement of the Baiyunhu sag,featuring continuously distributed,thick Mesozoic strata and the lack of regional faulting and magmatic activity,is scarcely affected by tectonic movements and possesses great potential for oil and gas exploration.

Key words： Baiyunhu sag airborne gravity-magnetic anomaly structural stratification significance of oil and gas exploration Qiangtang Basin

Received: 27 September 2023 Published: 26 February 2024

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	Articles by authors
	Zhong-Rong LIU
	Yue HU
	Zhi-Wei FAN
	Hong-Bing HE
	Dao-Qing ZHOU
	Zhi-Hong GUO
	Bao-Bao CAO
	Yan-Yan WEI

Cite this article:

Zhong-Rong LIU,Yue HU,Zhi-Wei FAN, et al. Airborne gravity-magnetic anomalies in the Baiyunhu sag,Qiangtang Basin:Characteristics and implications for oil and gas exploration[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 48-57.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1339 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/48

Location of the research area

Regional geological map of research area

Magnetic determination results of rocks and density distribution of the strata in the research area

Reduced-to-pole regional aeromagnetic (ΔT) anomalies in the Baiyunhu sag

Diagram of the vertical first derivative for reduced to pole regional aeromagnetic (ΔT) in the Baiyunhu sag

Color grid of the airborne Bouguer gravity in the Baiyunhu sag

Diagram of the vertical first derivative for airborne Bouguer gravity in the Baiyunhu sag

Tectonic map of igneous rocks in the Baiyunhu sag

Color shaded grid of the depth of the top of the magnetic basement in the Baiyunhu sag

Burial depth of the Mesozoic bottom in the Baiyunhu sag

Interpretation of gravity and magnetic anomaly profiles

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