基于界面反演增强的位场边缘识别方法

doi:10.11720/wtyht.2022.1116

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Abstract

One of the pivotal tasks in energy and resources exploration is identifying geological boundaries such as petroliferous structure, ore-controlling faults, and rock mass boundaries. The edge recognition of gravity and magnetic potential data has unique advantages in the detection of geological boundaries, and has become an indispensable and important means in energy and resources exploration. We have combined interface inversion and normalized vertical derivative of the total horizontal derivative (NVDR_THDR) for potential field data to improve the effect of the potential field edge recognition method for deep small-scale geological bodies. Firstly, we invert the gravity anomaly using density interface inversion method to make the anomaly more prominent of the small-scale geological structures, then the NVDR_THDR technique is used as an edge extraction and enhancement method to deal with the density interface inversion result. The results conducted with rifted basin model and the isolated bodies model show that the proposed method has obvious advantages of edge enhancement and can balance the deep and shallow anomalies to some extent. The real gravity data test of the northern Ordos Basin also show that our method can detect the small-scale faults in the basement of the basin, which indicates that this method can be successfully used in real data processing.

Key words： edge recognition density interface inversion gravity anomaly edge enhancement

Received: 05 March 2021 Published: 25 February 2022

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	Xu-Liang FENG
	Ze-Kun WEI

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Xu-Liang FENG,Ze-Kun WEI. An edge recognition technique enhanced with interface inversion for potential field data[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 130-140.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1116 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/130

A rifted basin model and its gravity anomaly

The edge recognition results of the rifted basin model

The edge recognition results of the rifted basin model with different density contrasts

The combination model and its gravity anomaly

The edge recognition results of the combination model

Gravity anomaly in northern Ordos Basin and the edge recognition results

The comparison between the edge recognition results and the seismic profile in northern Ordos Basin(The seismic profile is from reference [48])

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