J. 

Library of Congress Cataloging in Publication Data: 

Schatzel, Steven J 

Methane content of Gulf Coast domal rock salt. 

(Report of investigations; 8889) 

Bibliography; p. 16. 

Supt. of Docs. no.: I 28.23:8889. 

1. Salt mines and mining-Gulf States-Safety measure s. 2. Methane-Safety measures. 3. Salt domes-Gulf States. I. Hyman, D. M. 

(David Me). II. Title. III. Series: Report of investigations (United 

States. Bureau of Mines) ; 8889. 

TN23.U43 [TN902 ... All 6228 [622 .. 8] 84 ... 600124 
CONTENTS 

Abs tract .... e .... " .................................... .. ........................................... Introduction .... " .. " " ........ " ............................ " ........ " " .. " .. (> .. II ........ " ............ " .. II ........ " .. " .......... " " " 

Background ................................................................ II .. II .. It .............. " ......................................... .. 

Acknowledgments .. ~" " " " .. " " " ...... II .. II .............................. It " .... '" " " .. "It ........ "" .. ,. .... "",. .... """ .. "" .. .. 

Experimental tests and procedures ............ " ... "... .. ....................................... " 

Crushing method"" ... " ...... " ...... "" ............ .. 

Dissolution method .............................. .. ........ ., fit ••• e .... ., •••••••• ., e ••• If .... 

Estimations 

Application 

strategy 

of accuracy for the dissolution test ............ " ......... " ••••• " .... . 

of methane content testing as part of a methane prediction 

Disctlssion of test results ••• " .......... . 

Field test of methane 

Results and conclusions."" ............................. " ...................... " •• " •• 

References 

A&~~~u~.~~,,--Sample data base 

1. 

2. 

3. 

4 

5 .. 

6 

7 

8 .. 

9 .. 

10 .. 

1 " 

ILLUSTRATIONS 

Location of domal salt mines on Louisiana gulf coast •• " .................... . 

for dissolution " •••••••• " •••••• " •• " ..... . 

Distribution of methane contents for 80 domal salt tested. 

Salt categorization and corresponding methane content of 82 samples 

tested .......... . 

Methane content distribution and in 

each interval ................ 1>. • .... I> • I> ..... " " " .. " .. " .... " ... " ....... """ .. " .... " .. " ..... ",, .. .. 

Salt for each content interval ............................. .. 

Methane contents of domal and corresponding 

Methane contents and occurrence with 

for normal salt samples..... .. ................................................ . 

Location of holes 1 and 2 and the band of anomalous salt ected to the 

of methane at vent hose outlet" ........................... .. 

TABLE 

Gas of two control salt samples ... 

1 

2 

3 

4 

4 

4 

5 

5 

6 

6 

11 

15 

16 

17 

2 

5 

7 

8 

9 

11 

12 

13 

14 

6 
UNIT OF MEASURE ABBREVIATIONS USED IN THIS REPORT 

cm centimeter liter per second 

cubic centimeter m meter 

°c Celsius cubic meter 

g gram It cubic meter per metric ton 

md 

km kilometer mm millimeter 

kPa 
Steven Schatzel 1 and Davi d 

Research Center Bureau of Mines , PA" 
2 

INTRODUCTION 

volumes of methane have been 

into domal salt mines as a 

result of an outburst of salt followa face blast. Outbursts 

blasts that release methane gas have 

been known to occur in four of the Five 

Island domal salt mines of the Louisi-

" 1) .. 

ous gas outburst data 

do not appear in the literature, a Mine 

Safety and Health Administration 

suggests that a large outburst 

about 13,600,000 kg of salt. Gas was released at an estimated pressure of about 

8,000 kPa and expanded to a volume of 

2,800 at 

\ 

) 

I 

• 

pressure 1 e 2 outbursts appear to have accounted for the 

of methane hazards in these 

mines, other mechanisms do exist for 

the release of methane into the mine 

environment 

The Bureau has conducted extensive research in coal mines aimed at 

methane hazards 

the coal 

methane 

to or 

hazards in domal 

from 

Resalt 

2Underlined numbers in parentheses refer to items in the list of references 

preceding the appendix. 

, 

1. .. Location of domal salt mines on Louisiana gulf coast. 
mines very different 

from coal because of different gas occurrence, retention, and release properties Salt domes are not with 

a natural fracture network 

to coal cleat, 

the 

is considered many authorities values from 

zero to about 600 md have 

domes .. 

strata outside the salt 

into the dome 

is the result of 

3 

of included sediments is ect to debate.. Problematic methane emissions have 

been associated with certain unusual 

or anomalous features .. g .. , included 

nonsalt bands, interconnected void zones, 

outbursts) 3 .. 

Some 

ods are 

of salt dome mining methsuited to with 

methane hazards.. intake and 

return air is difficult in many areas of 

domal salt mines because of their relaIn coal mines, 

which have much smaller 

of air 

continue to serve their purpose in 

but the most severe crisis situations 

BACKGROUND 

to their unusual structure and 

the association with 

rences salt domes 

been the ect of scientific and economic interest .. 

of salt domes are 

on in domestic and 

However methane occurrences 

salt dome seem to be 

and 

concern .. 

are not 

and 

a 

utilization 

methane occurrences 

in detail in the 

literature does document some 

work in 

domal salt rock. 

contents have been 

content in 

some methane 

, related geoinformation has not been 

limits the usefulness and 

internal The authors 

that hazardous methane occurrences are distributed 

evidence exists 

methane in the dome 

volumes of 

rial that 

formation are not 

rich Gulf Coast 

distribution of 

to be nonuniform .. 

source matemethane 

in the haliteThe same 

methane 

resist uniform distribut ion escape of any gases 

in a salt dome@ 

and its associated gas 

must be addressed 

the methane content of 

structure 

content variabilwhen 

domal 
zones 

brines 

not 

of methane released into the mine 

However such a 

still be enriched in methane 

of salts 

TESTS A..ND 

METHOD 

The first in 

lem of methane in domal salt 

of a new 

determine the amount of gas 

volume of salt@ Two tests were 

the Bureau and are described 

8 " 

to release methane upon 

the first method inof salt 

in a ball mill was 

continuous or conventional 

Some of the 

is used for determinations of coal gas 

modifications were necessary 

tation to salt The 

Certain 

any gas 

reactions and reduces the interference 

gases 

results of gas 

tions the modified 

tus exhibited a considerable 

data 

ball mille 

solution method 

the 

determinaapparascatter of 

Rethe 

dis-
DISSOLUTION METHOD 

Dissolution in a controlled 

has been cited as a means of gas content 

determination in literature and 

tests had been conducted 

the Bureau The noncorrosive construction of the dissolution 

chamber allows for easier maintenance and 

space to 

the dissolution 

time between tests. 

Whatever 

chamber 

is much smaller in 

as 

with the 

is higher concentrations 

The result 

of released 

gases 

chamber, 

error 

which 

within the 

decreases the 

dissolution 

effect of 

factors over the course 

disso 

5 

of the 

conducted at a 

The 

than 

side contamination atmosnear atdecreases errors 

and decreases 

the 

pressure also 

in chamber gauge 

errors in Standard 

ature and Pressure ( ( C, 760 rom 

conditions. 

ESTIMATIONS OF ACCURACY FOR 

THE DISSOLUTION TEST 

An indication of the dissolution test 

low-end resolution was in 

its Chemical reagent sodium 

) was obtained as an expercontrol. The reagent is 

is 

controlled 

the 

of 

.98 pure NaCI. The reagent 

in a 

environment, which precludes 

of methane Two samples 

out at near the 

for the dissolution 

chamber. to be the poorest operating condition for the experiment. Gas volumes were then 

a data established 

for all The procedure gas samples before and after dissolution of a 

salt sample to be drawn from the chamber 

The shows 0.0002 

of the three gas samof one of the 

I) .. The othno detectable methane. 

For a conservative estimate of the gas 

detection limit, .. conditions Instead of averfrom 

methane content was 

the methane conof was calcuworst case conditions as to the methane 

limit Data reduction indicated 0 0003 

/100 g to be 

is considered an estimate 

resolution 

exceeded to be as 
6 

TABLE 1. - Gas of two 

Before dissolution •• eee 0 .. 57 1.78 0.015 ND 

.. 53 1,,72 .014 1<2 

After dissolution." .... " 1.13 023 .. 0002 

.47 1 .. 17 .022 ND 

1 .. 15 .. 022 ND 

2: 

Before dissolution ••••• 1 .. 24 4 .. 30 .. 016 ND 

1 .. 47 5 .. 10 .012 ND 

After dissolution.e e• e • 1,,61 4 .. 68 e020 ND 

1 62 4.70 ,,021 ND 

1,,63 4 .. 71 ,,021 ND 

ND Not detected. lparts per million" 

NOTE .. --Carbon monoxide and 

not detected .. 

Errors from measurements 

all phases of the experiment and combined 

in data reduction have 

been found to methane 

content error of about 5 

APPLICATION OF METHANE CONTENT TESTING 

AS PART OF A METHANE PREDICTION STRATEGY 

A field test of methane hazard evaluation procedure was planned. In a Louisiana domal salt mine, plans were made for 

two holes to be core drilled at nearly 

from within mine workings. The first hole was to be drilled 

in an area that was from a zone 

that had emitted very small amounts of 

methane during The second hole 

was oriented to intercept a continuous 

zone of anomalous argillaceous salt known 

to have been related to increased methane 

emissions .. 

were 

Mine emission rates for methane from 

normal salt and the same band of anomalous argillaceous salt were measured below 

this level while a develdecline. Normal salt emitted less 

than 0,,16 Measurements of mine 

emissions of methane in the anomalous 

salt ranged from 0.47 to 2.18 

Average gas contents of of 

two types of salt from the two Belle Isle 

core holes were 0.0046 and 0.021 CH4 / 

100 g NaCI, 

Both holes were to be monitored for 

emissions during drilling. gas flows 

encountered would be measured and 

for gas composition The cores 

were to be tested for gas content and 

compared to determine the of 

potential methane hazard prediction 

gas content .. 

DISCUSSION OF TEST RESULTS 

A histogram of methane contents for all 

samples tested is presented in figure 3. 

The horizontal scale shows methane content on a five-cycle logarithmic axis required to accommodate all of the data 

points. The vertical scale shows the 

number of samples in each methane content 

interval. 

The various domal salt rock lithologies 

were grouped into three major classes 

based on geological association and methane emission history during mining. The 

types were defined as follows: 

1 .. 

parent 

Normal salt--white to gray, transto translucent, very rich in 
7 

30 I I I II I I I I I I I" II I , , I 1'1'1' , I I 

z 

20 

15 

10 

5 

iIi--

i--

i--

-

-

-

-

o I I I I I I II I I I I I I I I I I I I I I I I I I I I I I 

sodium chloride, few 

medium 

2.. Outburst 

gray, sometimes 

crystal size and 

E 

white to 

sometimes showing curved cleavage traces continuous 

over a few centimeters, gas bubbles sometimes included in the salt mass. The 

essential criterion for all outburst 

salts is that are associated with an outburst .. 

3 Anomalous salt--includes central 

and edge anomalous zones, dark and relatively continuous, frequently with 

brine and gas seeps, occasionally with 

petroleum seeps, argillaceous 

sandy.. This also includes lithologies such as sandstone breccias and 

vite as bands that can be continuous or may be discontinuous and 

out over distances of 30 to 

70 m. Other non-NaCI materials are included in this 

salts, gypsum, 

etc .. ) 

4 shows these 

with some additional delineationsG Core 

are 

abcissa 

9 

sah 

normal salt and anomalous salt 

in normal salt are categorthe same criteria as the other 

The cored were obtained 

holes to 

and 

in a sectionG The 

salt control samples are 

less methane 

100 g NaCI, the estilow-end resolution, 

intersection of the 

ordinate 

are considered to have essentially zero 

methane content .. 

Some of methane contents can 

be seen between the salt types.. However, anomalous salts and outburst salts 

represent the of 

methane-content salts. Normal salts 

represent the of low-methanecontent salts.. Some of the normal salts 

indicated methane contents of the same 

magnitude as the control samples. Outburst range from 0.0 

to 7 4 NaCI Anomalous 

salts range from to 2 6 

100 g NaCI. Methane contents for normal 

salts vary from less than 0 .. 0003 to 0.31 

cm3 /100 g NaCI. 
8 

sets 

tics of domestic 

shared more than 

been noted in the 

related to 

ardous conditions 

that some 

o 0 

hazardous conditions in salt mines are 

are 

as precursors to 

conditions Because one of 

features can 

others 

were used 

to aid 

methane enriched 

, the presence 

the molecular 

ratio is less than ,and 

enrichment were examined for correlation 

with methane enrichment@ The presence of 

appears to be 

icant and it is associated with 

methane contents This 

in a tabular format in 

Carbon dioxide enrichment 

methane content salts 

of some 

was observed; 

in 

methane 

cates that if a dissolution test 

are , the mine operator should be alerted to a methane enriched zone 

for the individual salt the gas 

content distribution among 

contained 

NaCI 

The 

are also shown 

normal salt 

less than 0.1 

Of all 

classified as normal, 

All 
fil1""'''''--I"'''''''''' content d 

sa 
10 

contained 

NaGI. No 

served within this interval. 

of the normal salt samples tested 

contained between 0.001 and 0.01 / 

100 g NaGI with 23 pct of those samples 

7 pct 

of the normal salt samples contained between 0.01 and Oel cm3 CH4/l00 g NaCI 

with two of the four in this interval higher hydrocarbons. One 

salt sample was between 0.1 and 

/100 g NaGI and it showed 

content. Of the 54 

normal salt samples tested, 17 contained 

The methane contents of the anomalous salts are shown in figure 5ee A 

salt sample is included here because it is geologicalrelated to the anomalous 

zones included in this class. The gas 

contents of the 12 anomolous salt samare with three of the sambetween 0.001 and 0.01 100 g 

NaCI. Of those three , one showed 

higher hydrocarbons. The next higher 

methane content interval, 0.01 to 0.1 cm3 

/100 g NaCI contained five of the anosalts. Two of these showed higher 

hydrocarbons. were between 

0.1 and 1.0 NaGI with one 

sample higher 

In the 1.0 to 10 cm3 CH4/100 

g NaCI group were two of the samples. 

Both of the samples in this interval 

contained higher hydrocarbons. Overall, 

6 of the 12 anomalous salt samples contained higher hydrocarbons. 

Outburst salts accounted for 14 of the 

samples tested, 11 samples indicating 

the presence of higher hydrocarbons (fig. 

3D). The lowest gas content interval of 

the outburst salts was from 0.01 to 0.1 

cm3 GH4/100 g NaCl where two of these 

samples were present and where no samples 

were determined to have a higher hydrocarbon content. Higher were 

all four of the samples from 

100 g NaGl and seven 

of the samples in the 1.0 to 10.0 

CH4/100 g NaCI interval (fig. 5D). 

Anomalous salt samples show a wide 

range of methane contents. These 

share the 1.0 to 10.0 100 g NaCl 

interval with outburst salts and the 

0.001 to 0.01 100 g NaCl interval 

with normal salts.. Most of the anomalous salt samples were collected in areas 

to be associated with edge or 

central anomalous zones which may represent relatively continuous and 

gas paths and/or reservoirs 

within the dome structure. This could 

allow for high methane contents where gas 

was within the hand sample until 

released dissolution. However, 

since these zones appear to have the 

gases, samples 

the escape of gas before 

dissolution tes in low exdetermined methane contents. 

Therefore, a low gas 

not reflect 

that zone 

The of each domal salt 

making up the total salt sample population within each gas content interval is 

in 6. The interval from 

0.0001 to 0.001 cm3 CH4/100 g NaCI contains only normal salt samples. Anomalous salts account for about a tenth of 

the between 0.001 and 0.01 cm3 

/100 g NaCl with the remainder being 

normal salt. The area bounded 0.01 

and 0.1 cm3 100 g NaCl represents a 

group of of four normal 

salt, five anomalous salt, and two outburst salt samples. Between 0.1 and 1.0 

CH4/lOO g NaCI are samples of all 

three salt types. The samples between 

1.0 and 10 cm3 CH4/100 g NaCI consist of 

outburst salt, for one anomalous 

salt sample .. 

It was apparent from the analyses that 

those samples with higher methane contents had a greater frequency of higher 

than those with relatively 

low methane contents. Higher 

bons can be a useful methane hazard indicator in samples where methane may escape 

before testing .. 
6 ... 

Methane content, methane emissions, and 

outburst hazards in coal have 

been found to increase with 

of The same relationhas been suggested for domal salt 

mines where methane related mine disasters and depths have increased in 

recent years. Potential energy stored in 

the salt mass can be at 

as gas pressures 

gas content will increase 

Gas content pressures were not determined 

in this study .. 

A of contents of domal 

rock salt 

is in 

pIes taken from the shallowest 

have low methane contents with 

generally low , a trend of increasing methane content with 

is not clear. The sample population in this was not 

1 

an unbiased manner with reSince all salt 

discussed are included in this and a 

of methane content variabilthe , the 

data may involve variables that have not 

been accounted for. 

content 

may be more 

between methane content and 

Of the three salt o .... W!. ................. , 

the normal salts 

and could most 

were the most abundant 

be found in different mines at various Mine operators tend to in 

normal salt and avoid anomalous zones .. 

A of normal salt methane contents 

versus 8. 

No direct and 

appear to 

creased occurrence 

and increased 

does 

FIELD TEST OF METHANE PREDICTION STRATEGY 

Two core holes were drilled horizontalfrom the 427-m level in the 

Inc., Belle Isle Mine 

was drilled into an area of 

normal salt. Hole 2 was oriented to intercept a ected band of anomalous argillaceous salt. 

Hole 1 drilled in 1982 to a 

m. Methane from the hole was 

monitored at the vent hose 

outlet (fig.. Methane concentrations 

were measured core retrieval 

when the hole was flushed with brine 

fluid, which 

out of the hole and 

the gases 

the vent 

hose.. Methane concentrations were 

below 0.15 and returned to zero after 

the hole. At no time the 

drilling of hole 1 were any measurable 

methane flows detected. 
2 

E 

Hole 2 

total 

7 ... Methane contents 

was drilled in 1982 to a 

of 38 me The 

methane monitor 

of hole 1 was 

hole 2 

malous 

transition zone of anosalt bands intercalated in normal 

about 6 m before 

salt 

the 

was encountered 

ected location 

of the anomalous zone and before 

the cut core was retrieved, a 

odor was noticed. Checks for gas 

were made more often in this zones When 

the core was retrieved, well-defined 

bands of white salt and black 

ous salt were observed. The presence of 

methane near the collar of the hole was 

indicated and increased in concentration 

not 

in the 

the open ended drill steel 

could be detected but 

Methane concentrations 

hole were measured with a hand 

/ 9 

and ,...,....· .. ""'~n .. 'nn 

held methanometer and were between 90 and 

, these events occurred at 

work shift 

in another area of 

the mine@ The hole was not 

shut in any in-hole pressure 

because under similar circumcemented have been 

the blast, 

returned to the drill site to collect 

for gas and check the 

behavior of the flow.. The methane concentration 

flowed at 0.,33 

and the gas 

circumstances unrelated to 

forced one-half 

of additional drill site access 

The hole was left open The 
1 

'J'-'--,-,-,,",-,orooo 00 0 

c:cco 0 
14 

/ Hole 2 drilled in July 1982 

Methane emissions first encountered at 38 m, approximately 6.1 m 

before the band of anomalous salt 

Depth of mining; 427 m 

Intake 

FIGU 9'JJ .. Location of hoi es 1 and 2 and the band 

of anomalous salt ected to the 427"m levelll 

FIGURE 10111 '" Continuous 

coincide with the dark 

in the core 

bands 

from 

in hole 2 

anomalous 

riched 

methane contents of core samthe transition zone collected 

were not as enriched as some 

salt were enthe of normal 

salt core in one instance 

contained Three of 

the four were within a methane 

content interval zone of the 

three salt between 0 01 and Oe1 

/100 g NaCI. A more continuous sequence of anomalous salt 

about 6 m and continues on for 

more 

meters. The forced termination 

halted the collection of 

in this zone Predata taken at several locations 

this anomalous zone indicate that 

methane content is the center 

of the zone than at its 

of methane at vent hose outl et. 
15 

RESULTS AND CONCLUSIONS 

Gas movement in salt is not 

well defined as gas movements in 

some characteristics 

gas 

movement, fracture 

network, do not occur in salt domes. 

Methane occurrences in domal salt are 

nonuniform. of five orders 

of in methane content indicates 

that the methane does not in 

the salt and may be limited to milocalized gas 

Thus, determination of gas content can information 

methane hazards, 

with 

Normal salt methane contents have been 

found to be low. Over 90 

of the normal salt tested contained less than 0 01 100 g NaCI 

There are wide ranges of methane enrichment in normal versus outburst 

salts criteria have been 

forth as associated with outburst 

salts (increased size, included 

gas bubbles, contorted cleavage surfaces, of a core , etc.) 

but these features were not 

dent in the outburst salt 

For the purposes of this 

association with an outburst 

sential criterion for the 

cation. However, where a outburst zone is being breached 

for the first time, 

sociation cannot be used and 

features are unreliable. The dissolution 

test can information 

to distinguish outburst salt. 

There are no other methods 

available. The methane content of outburst salt is high. The outburst 

salt samples had a methane content 

than nearly all of the normal salts included in this paper. 

Anomalous salt oa=V4~:O, 

from what was identified 

edge anomalous zone, have 

methane contents 

of these zones 

as one mine's 

variable 

because of the 

to 

gases. Methane contents of of 

anomalous salt from 0 001 to 0.01 

100 NaCI, a methane content interval normal salt and 

from 1.0 to 100 g NaCI where 

the group of outburst is 

found. It is unclear whether anomalous 

salts that are discontinuous and not associated with or central anomalous 

zones are methane enriched. 

and central anomalous zones will 

emit much 

normal salts 

2.18 m3 /t) 

sirable sites 

will 

methane emissions. 

methane than 

0.47 to 

for increased 

indicates that normal salt 

does a measurable gas flow. 

central anomalous zones have 

gas flows in some mines. The 

initial gas flow from a 7.6-cm-diam drill 

hole in a band of anomalous 

0.33 with methane concentrations 93 

The of is 

common methane content salts 

and in low methane content 

salts. They may be useful in 

the anomalous salts where methane may escape from the before 

testing. 

shallow domal salt mine levels 

had generally low methane contents, no 

trend of methane content with 

can be seen from the 80 salt samtested. Carbon dioxide enrichment 

may coincide with methane enrichment but 

does not appear to be as variable as 

methane. 

contents 

allow a 

tential 

of an rocore program, gas 

from dissolution testing, and 

geologic mine could 

mine operator to assess the pofor encountering methane gas. 

17 

APPENDIX.--SAMPLE DATA BASE PRINTOUT 

SAMPLE TYPE DE CONTENT H ER 

NUMBER (CM3/100G) 

---~~------------------------------------------------- --------------------- 10. W C 

195 W NORMAL C 

201 W NORMAL C 

46.196 W C C2H6, C3H8, C4H 

47 .. 195 W C 

65 .. 155 Z D , C , C 12 

68 .. Z D 

159 Z D 

Z D 

Z B 

Z D 

Z ANOMALOUS D 0 .. 7000 C2H6, C3H8, 

7 Z D 2 .. C2H6, C 

80 .. 189 W OUTBURST C 1.6000 C2H6, C3H8, 

80 .. W OUTBURST C 1 .. 4000 C2H6, .. 255 W C C , C 2 

82 .. 255 W OUTBURST C C2H6, C3H8, 

83,,252 W OUTBURST C C2H6, 

84 .. W C C2H6, C3H8 

W C 

86 .. 253 W OUTBURST C C2H6 

87 .. 256 W OUTBURST C C2H6, C4H1 C 

88 .. 257 W C C2H6 

89 .. 274 X NORMAL B 0 .. 0006 

90 .. X B 

91 .. 273 X B 0 .. 0000 

92 .. 273 X B 0 .. 0028 C2H6 

93 .. X NORMAL B 0 .. 0000 

94 .. 272 X NORMAL B 0005 

95 .. 271 X NORMAL B 0 .. 0000 

X NORMAL B 0 .. 0004 

97 .. 356 X NORMAL B 0 .. 0000 

98 .. 361 X NORMAL B 0 .. 0005 

99 .. 361 X NORMAL B 0 .. 0000 

100 .. 027 X NORMAL B 0 .. 0000 

101 .. 362 X NORMAL B 0 .. 0006 

102 .. 362 X NORMAL B 0 .. 0009 

103 .. 363 X NORMAL B 0,,0017 C 

104 .. 363 X NORMAL B 0 .. 0000 

105 .. 028 X NORMAL B 0 .. 0000 

106 .. 364 X NORMAL B 0000 

107 " X B 0 .. 1 X B 0 .. 1 X B 0 .. 0026 C 

1 X B 0000 

* A < M < B < M < C < M < 0 
18 

SAMPLE NE SALT TYPE CH4 CONTENT HIGHER HYDROCARBONS 

NUMBER (CM3/100G) 

-~~~-------------------------------------------------- --------------------- 111 .. 032 Y OUTBURST D 1 .. 5000 C2H6 

112 .. 032 Y OUTBURST D 1 .. 1000 

11 033 Y NORMAL D 0890 C2H6 

114 .. 033 Y NORMAL D 0 .. 3100 C2H6 

115 .. 034 Y OUTBURST D 0 .. 6200 C2H6 

116 .. 035 Y ANOMALOUS D 0 .. 0350 

117 .. 038 Y ANOMALOUS D 0 .. 1200 

951 .. 351 X NORMAL B 0 .. 0000 

1001 .. 210 Z NORMAL C 0 .. 0021 

1002 .. 214 Z NORMAL C 0 .. 0020 

1003 .. 214 Z NORMAL C 0 .. 0130 

1004 .. 166 Z NORMAL C 0 .. 0070 

1005 .. 168 Z NORMAL C 0 .. 0039 

1006 .. 168 Z NORMAL C 0 .. 0053 

1007 .. 168 Z NORMAL C 0 .. 0110 

1008 .. 169 Z NORMAL C 0.0024 

1009.175 Z NORMAL C 0 .. 0032 

1010 .. 175 Z NORMAL C 0050 

1 1 .. 176 Z NORMAL C 0008 

1012. Z NORMAL C 0 .. 0029 

1 174 Z NORMAL C 0 .. 0032 

Z NORMAL C 0 .. 0027 

2002 .. Z NORMAL C 0 .. 0030 

2003 .. 245 Z NORMAL C 0 .. 0110 

2004 .. 246 Z NORMAL C 0 .. 0066 

2005 .. 250 Z NORMAL C 0 .. 0090 

2006 .. 252 Z NORMAL C 0 .. 0019 

2007 .. 258 Z NORMAL C 0 .. 0011 

2008,,259 Z NORMAL C 0047 

2009 .. 260 Z NORMAL C 0 .. 0012 

263 Z NORMAL C 0 .. 0028 

2 1 .. 236 Z ANOMALOUS C 0 .. 0120 

1 237 Z C 

2011 .. 238 Z ANOMALOUS C 0 .. 0060 

2011 .. 251 Z ANOMALOUS C 0 .. 0390 C2H6 

* DEPTH: A < 230 M < B < 380 M < C < M < D 

<>U. S. GPO: 1984-705-020/5038 INT.-8U.OF MINES,PGH.,PA. 27683