Bollettino di Geofisica Teorica e Applicata
OGS Website BGTA homepage
About the Journal
Contacts
To Authors
On-line Submission
Subscriptions
Forthcoming
On-line First
The Historical First Issue
Issues

2021 Vol. 62
1 / Suppl. 1

2020 Vol. 61
1 / 2 / 3 / 4 / Suppl. 1

2019 Vol. 60
1 / 2 / 3 / 4 / Suppl. 1 / Suppl. 2 / Suppl. 3

2018 Vol. 59
1 / 2 / 3 / 4 / Suppl. 1

2017 Vol. 58
1 / 2 / 3 / 4

2016 Vol. 57
1 / 2 / 3 / 4 / Suppl. 1

2015 Vol. 56
1 / 2 / 3 / 4

2014 Vol. 55
1 / 2 / 3 / 4

2013 Vol. 54
1 / 2 / 3 / 4 / Suppl. 1 / Suppl. 2

2012 Vol. 53
1 / 2 / 3 / 4

2011 Vol. 52
1 / 2 / 3 / 4 / Suppl. 1

2010 Vol. 51
1 / 2-3 / 4 / Suppl. 1

2009 Vol. 50
1 / 2 / 3 / 4

2008 Vol. 49
1 / 2 / 3-4 / Suppl. 1

2007 Vol. 48
1 / 2 / 3 / 4

2006 Vol. 47
1-2 / 3 / 4

2005 Vol. 46
1 / 2-3 / 4

2004 Vol. 45
1-2 / 3 / 4 / Suppl. 1 / Suppl. 2

2003 Vol. 44
1 / 2 / 3-4

2002 Vol. 43
1-2 / 3-4

2001 Vol. 42
1-2 / 3-4

2000 Vol. 41
1 / 2 / 3-4

1999 Vol. 40
1 / 2 / 3-4

1998 Vol. 39
1 / 2 / 3 / 4

1997 Vol. 38
1-2 / 3-4

1995 Vol. 37
145 / 146 / 147 / 148 / Suppl. 1

1994 Vol. 36
141-144 / Suppl. 1

1993 Vol. 35
137-138 / 139 / 140

1992 Vol. 34
133 / 134-135 / 136

1991 Vol. 33
129 / 130-131 / 132

 
 

Vol. 62, n.1, March 2021
pp. 119-134

Discussion on monitoring and characterising group drilling pumping test within a massive thickness aquifer using the time-lapse transient electromagnetic method (TEM)

J. Zhang, K. Chen, H. Huang, L. Zhen, J. Ju and S. Du

Received: 25 February 2020; accepted: 25 June 2020

Abstract

To investigate underground hydrogeological conditions and to obtain accurate aquifer parameters, the time-lapse transient electromagnetic method (TEM) is applied to image groundwater drawdown within a massive thickness sandstone aquifer (thickness over 100 m) in Inner Mongolia, China. 2D geophysical models are established based on the hydrostratigraphy of the survey site and, then, the induced electromotive forces (EMF) pre- and post-pumping test are analysed. Multiple aquifers can be detected by 2D forward modelling and the unsaturated region can be distinguished by the variation of electromagnetic responses. Furthermore, the measured electromotive force curves before (pre-) and after (post-) pumping deviate from each other and the groundwater drawdown has a positive correlation with the deviation degree, namely relative variation. The raw EMF data are processed with Occam's inversion method and two 2D resistivity data volumes are obtained. The resistivity-depth cross-sections from the data volume show that the groundwater drawdown is larger in the east of the TEM area due to the large permeability and water content. The centre of the depression cone is located at east Pumping Well 1 and the drawdown is 70 m, which is basically coincident with the group drilling pumping test result.



Download PDF complete


back to table of contents