重力异常及其梯度张量DEXP定量解释方法的影响因素分析

doi:10.11720/wtyht.2020.1360

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Abstract

Fast imaging inversion method has been a hotspot in quantitative interpretation of gravity and magnetic exploration in recent years. Because it does not need to add prior information in the calculation, it can quickly estimate the source depth, density and other related parameters. DEXP (Depth from Extreme point) imaging method adds the corresponding structural index to the depth scaling function in the calculation, making the imaging results more accurate. Based on the basic theory of the DEXP rapid imaging method, firstly, transformation formulas for gravity field and gravity gradient tensor regarding depth from the extreme point method were calculated and applied to the causative source interpretation in this paper. Then, through different synthetic models tests, the effects of sampling interval, data error, computing range and background field on the imaging results were analyzed, respectively. Finally, the imaging method was applied to the full gravity tensor gradient field data, and the results were compared with those provided by previous researchers in the literature. Both the synthetic tests and the field example show that the DEXP imaging method not only has good suppression on the noise in the observation data but also shows the characteristics of computing stability and accuracy. In addition, the data sampling interval, calculation range and background field all have certain influences on DEXP imaging results. Therefore, when actual field data are interpreted, it is necessary to comprehensively consider their influences on the imaging results and perform the corresponding pre-processing to improve the accuracy of the quantitative interpretation.

Key words： DEXP gravity anomaly gravity gradient tensor quantitative interpretation influence factor analysis

Received: 15 July 2019 Published: 24 June 2020

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Corresponding Authors: Jin-Song DU E-mail: jinsongdu@cug.edu.cn

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	Feng QIU
	Jin-Song DU
	Chao CHEN

Cite this article:

Feng QIU,Jin-Song DU,Chao CHEN. Influence factor analysis of quantitative interpretation for gravity anomaly and its gradient tensor by DEXP[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 540-549.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1360 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/540

Gravity anomaly (a) of the rectangular prism model and its DEXP transform results (b)

Gravity gradient tensor components of the rectangular prism model (a) and its DEXP transform results (b)

T_zz component anomaly of the rectangular prism model with different Gauss noise
(a) T_zz component with 0% Gauss noise; (b) T_zz component with 1% Gauss noise; (c) T_zz component with 2% Gauss noise;(d) T_zz component with 5% Gauss noise; (e) T_zz component with 10% Gauss noise

Fig. 3.
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DEXP transform results of T_zz component corresponding to Fig. 3.

DEXP transform results of T_zz component with data spaces of 1 m (a), 2 m (b) and 5 m (c)

DEXP transform results of T_zz component with data spatial ranges of -50~50 m (a), -60~60 m (b),-70~70 m (c), -80~80 m (d) and -100~100 m (e)

DEXP transform results of T_zz component with background fields of -1E(a)、-0.5E(b)、-0.2E(c)、0E(d)、0.2E(e) 和 0.5E(f)

Gravity anomaly (a) in Vinton Salt Dome region and its DEXP transform results (b)

The full gravity gradient tensor fields in Vinton Salt Dome region

DEXP transform results of the full gravity gradient tensor field data in Vinton Salt Dome region

The residual fields of ΔT_xx, ΔT_yy and ΔT_zz components after anomaly separation in Vinton Salt Dome region

DEXP transform results of the residual fields of ΔT_xx, ΔT_yy and ΔT_zz components after anomaly separation in Vinton Salt Dome region

The results of the corresponding structural index N_p

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