technical report wra83039 · 2019-08-14 · technical report wra83039 viewed at 04:02:22 on...

Technical Report WRA83039

Viewed at 04:02:22 on 18/02/2010 of 23.

I I I I I I I I I I I I I I I I I I I I

GEOPHYSICAL REPORT 83/6

RESISTIVITY SURVEY : KINTORE RANGE, 1983

Prepared by :

TERRY RITCHIE water Division Department of Transport Alice Springs, N.T.

20 July 1983

and Works

'.


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CONTENTS :

1. Introduction

2.

3.

4.

5.

6.

Geology of the area

Survey objectives

Instru-'1lentation

Field techniques

Results


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1. INTRODUCTION

During the period 27.6.83 to 5.7.83 a resistivity survey was conducted in the Kintore Range area by staff of the Water Division, Northern Territory DeparL~ent of Transport and Works.

In this time II vertical electrical soundings (VES) and 10.5 line-kilometres of horizontal profiling were completed by a crew of 1 geophysicist and 3 field assistants.

The above activities were undertaken as part of the department's investigation of the groundwater resources of this area. .


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2. GEOLOGY OF THE AREA

Broad details of the geology of the Kintore Range area may be found on the Mt. Rennie, N.T. I : 250 000 Geological 'Series map.

The Range trends NE/SW and is formed by the steeply dipping proterozoic Heavitree guartzite faulted against basalts and granites of similar age. The base of the range on the NW side is mainly covered by a tertiary conglomerate.

A NW flowing water course almost equally divides the range and it was along the northRrn ~argin of this creek, where the scree-conglomerate ~s absent, that the present investigation was located.


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3. SURVEY OBJECTIVES

"

The purpose of the resistivity survey was to investigate the areas immediately adjacent to existing bores R~ 12634 and RN 12638 (Map 2) in order to map the extension of any prospective indications.

RN 12634 had been sited to intersect a regional fault and a good supply of water struck at 5 m. The specific aim in this area was to accurately determine the strike of the fault and consequently delimit the extent of the shallow supply.

RN 12638 was not sited on any geological structure and was drilled to 60 m before obtaining a supply. Work ,in this area was aimed at better understanding the subsurface conditions.


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4. INSTRUMENTATION

The resistivity instrumentation used is fully documented in Geophysical Report 82/1. Briefly, it consisted of a 300 W DC/DC convertor employed as a transmitter while a high impedance digital volmeter was used as a receiver.


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5. FIELD TECHNIQUES

5.1 Sounding

11 Schlumberger VES were completed at sites indicated in Figures 12 and 13. Generally the halfcurrent electrode distance (AB/2) was expanded to 300 and occasionally 460 metres while the halfpotential electrode separation was moved from .3 to 30 metres (keeping AB/MN ~ 5). The frequency of sampling was 6 points/decade.

5.2 Surveying

Traverses 1-5 (map 1) were marked using a compass and were generally marked at 100 m intervals using a tape. Exceptions to this procedure were traverse 5, where distances were estimated using the vehi.cle odometer and traverse 4 which was located along a made road.

5.3 Profiling

The pole-dipole array was used throughout the survey. Details of electrode separations and plotting points are given in Figures 12 and 13. On all traverses the remote current electrode was located 1000 ID from the beginning of the traverse.

The geometries used were chosen from the VES results and _.ere chosen essentially to reflect bedrock depth. The multi-separation work on traverses 1-3 was done to more confidently locate the fault position.


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6. RESULTS

6.1 Sounding

Figures 1-11 summarise the VES results. The interpretations given are mathematically convenient (optimal in a least-squares sense) rather than physically meaningful. When further drilling information becomes available these solutions may be constrained to estimate depths. They may, however, be used to characterise 3 broadly defined areas :

Bedrock Depth VES No.

Shallow 6 Intermediate I, 4, 8, 9, 10, 11 and 12 Deep 2, 3 and 7

6.2 Profiling

The resistivity profiles, Kintore 1-3, Figure 12 indicate the presence of a fault at 212 m, 312 m and 375 m respectively, measured from the base line. These positions have been derived using both sets of results, by comparison with theoretical curves for an outcropping fault. Because the correspondence between theoretical and observed data is very good except for profile 3, n = 4 where the field data is poor, the locations are theught accurate and that RN 12634 actually lies on an area of very shallow basement that extends from the fault to abeut grid 650 m on each traverse.

On profiles 4 and 5, Figure 13, three features have been observed that require comment.

There is a general decrease in apparent resistivity with increasing chainage. This is regarded as due to an increase in basement depth and a division between intermediate and deep bedrock has been assigned atllOO m on traverse No.5 and 1800 en traverse No.4. This does not imply a sharp transition at these locations; rather an arbitrary level (100 ohm-metre) has been chosen for the purposes of describing a general trend.

The second feature is a small basement depression centred at about 400 m (profile 5) and 1025 m (profile 4) whose trend is parallel to the above.

Lastly the much 'noisier' appearance.of profile 5 is due to a consistent misplacement of one potential electrode up until 1300 m when it was noticed and rectified. Although the effect is obvious it does not obscure the more obvious trend of the data.


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DEPARTMENT OF TRANSPORT AND WORKS

WA TER DIVISION COPYRIGHT RESERVED

BORES # 1 RN 12634, # 2 (NGUTJURNGA) RN 12637,# 3 (KAPATURNYA) RN 12658 8 SANDY BLIGHT JUNCTION

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technical report wra83039 · 2019-08-14 · technical report wra83039 viewed at 04:02:22 on...

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