8/8/2019 resisitivity

1/22

SEG070047

IntroductionThis research project is conducted as a partialfulfillment for attaining a Bachelors Degree inScience (Applied Geology) from the

department of Geology, University Malaya.

8/8/2019 resisitivity

2/22

SEG070047

ObjectivesMain objective is to establish electrical and

properties of soil with different porosity,moisture and weathering grade.

In order to achieve this, the study wouldinvolve:

1.Correlating resistivity values of electricalimaging to the values obtained from the soilsamples taken from the slope

2.Investigating the variation of resistivity valueof the subsurface and relate it to weatheringgrade

3.Analyzing how resistivity varies with moisturecontent and resistivity

4.Inferring weathering profile in subsurface with

information from resistivity imaging

8/8/2019 resisitivity

3/22

SEG070047

Study areaWhere??The study took place in cut slopes around

Seremban, Negeri Sembilan.

The slopes are located between the latitudes ofN2042 to N2047 and longitude of E102000 toE102059

8/8/2019 resisitivity

4/22

SEG070047

8/8/2019 resisitivity

5/22

SEG070047

General Geology

The Seremban area is underlain byigneous rocks of granitic composition.

The Sedimentary rocks are

metamorphosed to varying degreesconsisting of schist, phyllite, slate. Quartzite occupy around 20 percent of

the area.

A small portion, about 4 percent, iscovered by superficial deposits, whichcontains tin in certain areas.

8/8/2019 resisitivity

6/22

SEG070047

Methodology

Carried out in 3 major steps:

vLiterature Survey

vData Accumulation

vData Interpretation and report writing

v

8/8/2019 resisitivity

7/22

W ork

Flo w

S E G 0 7 00 4 7

8/8/2019 resisitivity

8/22

8/8/2019 resisitivity

9/22

SEG070047

Example of samplecollection

8/8/2019 resisitivity

10/22

SEG070047

RESULTS

8/8/2019 resisitivity

11/22

SEG070047

Resistivity value (k) againstmoisture content(%)

8/8/2019 resisitivity

12/22

SEG070047

8/8/2019 resisitivity

13/22

SEG070047

8/8/2019 resisitivity

14/22

SEG070047

Combined data

8/8/2019 resisitivity

15/22

SEG070047

This experiments clearly shows thatresistivity value get lowered when

moisture is added. Hence, resistivity is inversely

proportional to moisture content.

The percentage of volume ofmoisture content is 5-53%,resistivity range from 30 -4500 m.

This corresponds to granitic soil of

weathering grade VI. The relationship of resistivity against

moisture content shows powerrelation of y= ax-b where a ranges

from 114 to 517 while b ranges

8/8/2019 resisitivity

16/22

SEG070047

Geo-electrical image

8/8/2019 resisitivity

17/22

SEG070047

S lo p e 1

VV I IV III II

8/8/2019 resisitivity

18/22

SEG070047

S lo p e 2

IV III IIV I V

8/8/2019 resisitivity

19/22

SEG070047

Slope 3 and 4

Wrong assemble of cable.

8/8/2019 resisitivity

20/22

SEG070047

Grain size analysis

Important in determining the grain sizedistribution of soil sample.

Type of particle Size range (mm)

Clay Less than 0.002Silt 0.06-0.002

Sand 2.0-0.06mm

Gravel More than 2.0mm

,A fter B u sch 1 9 9 3

8/8/2019 resisitivity

21/22

SEG070047

The grain size analysis is still in

progress, only 12 of the 18 sampleshad been sieve.

The grain size analysis can only be

completed once all the data iscollected.

Expected results of the grain size

around the study area is fine tomedium grain with significantamount of clay minerals in somearea which could explain the lower

resistivity value

8/8/2019 resisitivity

22/22

SEG070047

Petrography Study