9 /. : ,**.

ῌ25῍῎ῐ῍ῌῒ῔ΐ῏ῑ+,1-ῌ**- ,1-ῌ**-- 0/2ῌ, 0/2ῌ,,+  ,+/ ! . " , #$ 

,+0 ! / " ,* #%Conductivity Logging for Thermal Spring Well
Koji SATO+, Tadashi TAKAYA,, Tadashi CHIBA,+

Nihon Chika Kenkyuusho Co. Ltd., 0/2ῌ,, Hongo, Funabashi, Chiba ,1-, Japan,
Nihon Chika Tansa Co. Ltd., 0/2ῌ,, Hongo, Funabashi, Chiba ,1-, Japan

Abstract
Formerly, we-the present authors reported on the loggings of the self-ﬂowing thermal well (Sato et al, +333), and estimated the inﬂowing depth, temperature, volume andconductivity of thermal water ﬂowing into the well. This estimation was based on thechanges of the temperature, ﬂow rate and electric conductivity of the thermal water.
We report the results of loggings of ﬂuid temperature and ﬂuid conductivity
performed inside the casing pipe of two thermal spring wells.
At &Y” spring well, after the drilling of +,/** m, the loggings of temperature, di#erential temperature, natural gamma, self potential, electric resistivity, ﬂuid conductivity anddi#erential conductivity are carried out. From the results of these loggings, we proposed
the set up depths of strainer. When the uplifting of the thermal water (temperature .*',
ﬂow +0* l/min, water level-/* m) is stopped temporally, the loggings of ﬂuid temperatureand ﬂuid conductivity are done inside the casing pipe. The e#ective strainer andine#ective strainer are distinguished mainly by the change of the ﬂuid conductivity.
At &S” spring well (+,*,- m depth), as the temperature of the uplifted thermal water
has been lowered largely (/../'(ca-*') ; the uplifting is stopped and the loggings of
ﬂuid temperature and ﬂuid conductivity are tried inside the casing pipe. The invasion of
the di#erent water (perhaps the sea-water) through the broken part of the casing pipe isinferred from the changes in ﬂuid temperature and in ﬂuid conductivity. It is supposedthat the steel casing pipe is corroded by the salty water ﬂowing outside of the pipe.
Key words : Thermal water well, Logging of conductivity, Logging of temperature,Inﬂow of water)*+*, : -./ 01234 -234 5678

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Rwn+ῌEC

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,/ BU$8 >§o .~# ¨G$? Y/© [# Q$% dX$H  >EC? x >TSM?
 S  ªkQ ~« $Dm DklQ$%
EC>Sῌm?¬1­TSM>gῌl?

pHq j KCl > )*
$? BDE NaCl

- ® 7y$ [.H0¯D7Q$ HCl HNO- H, SO. NaOH CuSO. NH-Hq H y$D7Q$%~!  )*[. $ KCl 1°Hq '\+±²³´G$
Fig. ,D KCl

D$ 2µHq D$2µYXc$% Hqr x :}23  }d$% d x3}3¶: 0¯7Y ,/
3+.1·+.2 43¶[Gd$% ¸¹ >+30-?

> e\?  kl '\+[# *·/*KCl



237
*

2NaCl q 8fg

7 'º klY/© [#$ >Fig. -?% 0¯7Y}:$  8fg ».: > ¶:?
$d[. $% /.  ,**.

Fig. +2*&'(27Relation between Concentration of Soluble Matter and Electric Conductivity.
+- 

       !"#$%&'( + m )*+,&'( -./01 2(345 + m )*+,2(6789:;<=>?@  Fig. . A;B &CDEFG-.&H678I;J K* 6";4#JLMN";B &'(*78OPAS -./01/*Q/*,*** mSῌcmR*.*/Q/* mSῌcmR*.**/Q/ SῌmNaI TL ?TOU6"N + V)*WXY CPS +Z[;B2( \']^_`6"N";B  *abkg AS fg2(+,/h fi-2 mm cZ ,... m de 1.1,+* kgfῌcm, A;B &'(*78j(*./ Sῌm *kl,./ῌ AS 2(*j( l*./h A;B *mn op q(6 -* mῌmin rstu[;XvT6" 2 mῌmin *mnq(78B L3&'(*w 2(xyz{|[N"L"* y}J 78~(J3;2(JzMN*xy6{|L[LuL"B

% 

28Fig. ,-+Electric Conductivity of KCl Solution.
, KClY +,/** m !"#$%  &'%  ()*+, ()-. -/012 34-5 678&'-5 9 :;< =>?@A BC

"DE F GH Fig. /78MJA -/012 N012A &'34-5
UVUQWXY

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!6U<% "#V-5 "# $cde mSῌcm
Fig. 0f. &gh<U9 ViQGH

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hY aj!% j+,,/* m 

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 /.  H,**.

>?NO29

Fig. - Relation between Concentration of Na-Cl Solution and Electric Resistivity at di#erent
Temperature (Yamaguchi, +30-).
- NaCl   H  +30- ,2 gῌl  +,.03 m !"#$%&

 +,-03+,-2* m +,./2&'$ ()*+,-$.(/012/34567.89:;'<=.>?&45@ >?12 *.,/ Sῌm A7B12/3 CD:;7E +,,/* m FG>? H..+ Sῌm A7 &IJ>?12K.(LM3' 4567NO.& 3** m PQ>RSTUVWXYZ[\ ]%- ^O_`abK/cd%-/3 $ +,-+* m PQVW>e[\ ,12K$&f%$.'3-,S gh(/i .( E +,*** m j.45k7lmn1o!pqrn H22*m F& !" s/../t pH 0.2 u +1.-2 gῌl  Na-Cl

min 1 vw!xyqz{:;k  0 |7 -+./. gῌl  Na-Cl  [k HTable + 3,0* lῌ

-+.,t }~ pH 0.3 u

¡¦§

30

Fig. .



Equipment of the Well Logging.
῎ . ῍῏ῌῐ῎  

!"#

$ %&'()*+%, Fig. 1 - ./01 23 456789: ;<=$>? @A + BC ( DEF4 -,* m GH<# IJ#% K  LMNO4PQ89 3.* m GH<P-R4ST$ +UVPQ84 A , B + R#+ 2WXYZ[\] ,, (^4_`#( PQ8$ % LMNO ab#WXcd+ -- @WX /** cc 4efghijklmnSoUC WXpq+ +.*, <=K$ @A , B +C )*+ Fig. 2 @G +.* mr2,* mCu\Xvw,/ m  ,.xs 4 t)*; R

+yJ#%4 w-.* m  -,.,x H<yz#] {J# w-1*r/-/m ^+ ,1r,3x R% $ |G+yz#9w/1* m < -2x R%} t]+~ yz#9w2/* m .3x R% $ 8 #9 @<v *.3 SῌmmSῌcm v<s789: C +u\X

yJ#%4 w-.* m  +.0/ Sῌm H<yz#] w-1*r.** m  +./ Sῌm R{J# |G<+yz#9w.2* m  ..0 Sῌm R% $ B:<Sῌm R%} |G+{J#w/1* m < +.2/yz#9w2/* m < ,./ Sῌm R%K] yJ#%43** m |G,.* Sῌm R% $G ,+* m -** m -0/r.** m %<+ 4{J 8{J8 4 G .2* m RR:K14; + 4#9:%:<R+%4; 8R % $)* jG @22* m |GC }:<= G .2* m ¡XR+¢X42£ n¤#9: R; 8$ n¤X + ,../x ¥ n /.  ,**.

Fig. /

Logging Chart of Y” Spring Well (++1*ῌ+/** m depth).
ῒ / ῌY῍ ῐΐ῏῎ῑ῔ῒ +,+1*ῌ+,/** m 31



32

Fig. 0

Logging Chart of Y” Spring Well (2**ῌ+.2* m depth)-before and after uplifting.
ῒ 0 ῌY῍ ῐΐ῏῎ῑ῔ῒ 2**ῌ+,.2* m  

v /.  ,**./itu

33

Chemical Composition of Thermal Water of S” Spring4Table + + S /+Date (Year, Month)+33.4 2,**,4 3

Temperature ()/.4/-+4,Flow (l/min),0*7

PH, on site, in laboratory
7+*

Rn+*

042

0423

Ci/kg

E4R4 g/kg
Component
Sodium ion
Potassium ion



Na

K

043

042,

*42,*40+14-2-+4/.

mg/kg

mval῍

mg/kg

mval῍

/-**4*

1.413

3*014*

114*3,.24,,4*0-./4++41-
.

Ammonium ion

NH,+42*4-3+*4.

*4++

Magnesium ionMg,

-0,433403

32.4*+/42-Calcium ion

Ca,

1334*+,43.

/,14*/4+.

Ferrous ion

Fe,

24*

*4*3

343

*4*1

Manganese ion

Mn

Fluride ion
Chloride ion

F,

-40*4*.

+4-*4*+

7*4,*4**+4/*4*,

732+34*3-4/2+0-3*4*

3*43-.14.

*4,*/.43*4+.

/,-4+-402+22+4*

141*./14/,4/--1/4-+4,+*4,*4**Cl

7Bromide ion

BrSulphate ion

SO.

Bicarbonate ion

,7HCO

7-7-

Nitrate ion

NOmeta-silicate

H, SiO-+2/4+,.14*

meta-boric acid

HBO,24*.*4*

Free carbon dioxide

CO,+0042

3,4*

Na-Cl spring

Conc4Na-Cl spring

Characterictic ..0 Sῌm !"  -,., gῌl   

 -.#-/ gῌl $! %&'(" +331 ()*+,-$./01 !23) 4567.2* m 8-//
9:" ;<" =>)?@ABCDE FE GHῌIJK!L1 !23) >>MN7.,*#/0* m OPQR) >S5TUVWX$9/Y" Z)?@ABCDE[U*\]!9/K!^_`1 4" 9/ῌ9ab:*cd23e$ fghi1jk lmnopq .- rO sWtu Fig. 2 v , w , 1" fgx()yMNzxY>{|U}<7.,*#0/* m {|X4

>q" fghi~A EU //* m x1fgtu v - w

HIRS

34

Fig. 1 Fig. 2

Columnar Section of QS” Spring Well.
ΐ 1 ῌS῍ ῏῔῎ῐῑ῕ῒΐ

 //* m  .2* m  !"#$%&&' ( //* m) *+,-./ 01234 /**50/* m 678/12349:;<7 => ?6@ABCD!"#$%&E ?
6@ABFGHIJKLM;N8OP.8/h /. i #,**.%

g35

Fig4 2 Logging Chart of fS” Spring Well (+.*ῌ2,* m depth)4 2 S  #+.*ῌ2,* m Q%.  ,  #$"% &'(")*& #+% 567)89:;<=>?@A="@BC /
#E"% &FGH&IJ)!",-./01234'
D:"'K>LM4):"=3:"C =NO!P:"(QQ""RS(TQUVIJ) W@XYZ[= #,***% \23(B ]"^_`(a/!P aB:

b.cFdeclmn36        !"#$%&'( )*+ , -.  -/012324 56'(7-+24894$ %&' :#;# <=>?28@ABCDEF
G H32 IJ-K"#LM$NO4PLPL'()AQ32 : RSA"T12QU6P$VO WXY 8@Z[\H32 ]-^P_`a#6$ b12cdAeF4 $fgh +/ i 3 j ,0 k k lmnop /0 q^ores

῍ῌt uvw f+332s : mie p 1+ x y` z{$|}~ῌ ῌ f+333s : lH 0l7   lmn .2f.s$ ῌ} ῌ f,***s :  ll P2   p 1+ $ ῌ  ῌ ¡¢ ῌ £ ῌ ¤¥¦ ῌ (}~ ῌ §

f+331s : 7 ªm«¬ y` z{$­®¯ f+31/s : °±² l ­®¯³b´o$µ¶·[ f+30-s : a+l ¸¹ º»¼ z{$¨ ῌ g©

