05.09.2013 oil shale exploration and research, jargal, l. & erdenetsogt, b
TRANSCRIPT
Jargal, L.Erdenetsogt, B.
School of Geography and GeologyNational University of Mongolia
Introduction Survey history
Oil shale basins 13 basins in Mongolia
Stratigraphy Generalized information (Lower Creataceous)
Oil shale quality Brief information of some oil shale deposits
Resources
Oil shale and shale oil resources
Conclusions
The first information on oil shale was written by Tenner in 1931 at Uvurjargalant
Geological survey started since 1940s
1980s lab analysis in Estonia
1990s lab analysis in Japan
In 1994, classification of oil shale bearing basins (Bat-Erdene and Jargal)
Some domestic and foreign companies MAK and Genie Oil Shale Mongolia LLC
13 Oil Shale Bearing Basins
Lake Valey
Gobi-Altai
Ongi River
Tugrug
South Gobi
Middle Gobi
Ugi Lake
Uvurjargalant
Nyalga
Choibalsan
Tamsag
East Gobi
Sukhbaatar
Total area is 312,000 sq km.
Andkhudag Formation (150-700 m) Intercalated mudstone and
sandstone, shale with marl lenses and shale with sandstone layers
Khulsiin gol Formation (110-600 m) Coaly shale, coal
seam, siltstone and sandstone (Shuvalov, 1975)
ZuunbayanGroup is composed of 3 formations (Bat-Erdene, 1992) Maximum thickness is 1800 m
Oil shale-bearing Formation (<780m) The lower part - sandy conglomerates The upper part - mudstone with subordinate
sandstone, limestone, siderite nodules, dolomite, marl and siltstone with thick oil shale seams.
Coal-bearing Formation (<770m) Conglomerate, gross bedded
sandstone, siltstone, coaly shale with coal measures.
Sandy Conglomerate Formation (<250 m) Sandstone with conglomerate, fine grained
sediments and tuffaceous sediments
Middle Gobi Basin
Eedemt (Khuut) deposit
Bayanjargalan soum, Dundgobi aimag
Oil shale bearing unit is 160 m thick
Oil shale thickness is >10 m
Shale oil yield is <20% (average is ~5%)
Sulfur content is ~0.6%
Nyalga basin
Khumuult deposit
Bayanjargalan, Tuv aimag
Oil shale bearing unit can be divided into 3 members
Marl- siltstone member
Oil shale member (8 shale seams, cum. thickness is 127 m
Mudstone member
Shale oil yield is <15% (average is 4.4%)
Sulfur contents <1.85%
Choibalsan basin
Sumiin Nuur (Melkhii Bulag)
Gurvanzagal, Dornod aimag
Oil shale seams (thickness is <30 m)
Average shale oil yield is 6.6%
Oil shale resources was estimated to be 787.5 billion tones
Resources was estimated in only 19.2% of total area of oil shale bearing basins because of lack of survey
Khugshin Gol deposit in Ugi Lake basin ▪ >28 oil shale seams ▪ Thickness is < 11.5 m
Bayanjargalan deposit in Nyalga basin▪ Thickness of oil shale seam is <70.4 m
Tugrug deposit in Nyalga▪ >10 seams ▪ Thickness is <14.0 m
Bayan-Erkhet in Nyalga▪ Thickness of oil shale is <127.9 m
Shavart-Ovoo deposit in Middle Gobi basin ▪ >16 seams ▪ Up to 100.0 m thick
12.5
57.5
143
107.
6
102
312
15
0.6
35.4
0.5
0.4 14.6 16 0.9
3 0.0
3
1.1
0.0
6
0
50
100
150
200
250
300
350
Lak
e V
alle
y
Go
bi-
Alt
ai
On
gi R
iver
Tug
rug
Mid
dle
Go
bi
Nya
lga
Ug
i Lak
e
Ch
oib
alsa
n
Uvu
rjar
gal
ant
Su
dag
bu
lag
Ovo
osu
m
Tsag
aan
nu
ur
Billion tonnes
Oil shale resources Shale Oil resources
Shale oil resources 22.7 billion tones
7.8% of total area of oil shale bearing basins
Lack of survey
Shale oil resources
Basins/subbasins Shale oil
yeld, %
Resources (billion
tones)
Oil shale Shale oil
Middle Gobi basin
-North subbasin
-Undurshil subbasin
6.8
3.0
39.9
68.1
2.7
1.9
Nyalga basin
-Ulaankhooloin Gobi subbasin
-Nyalga subbasin
16.2
5.3
3.9
289.3
0.6
15.3
Ugi Lake basin 6.2 15.0 0.9
Uvurjargalant basin 3.1 35.0 1.1
Tsagaannuur basin 6.2 1.0 0.06
Choibalsan basin
-Sumiin nuur subbasin 5.0 0.6 0.03
Total 22.7
Oil shale is hosted in Lower Cretaceous rocks, which was accumulated in rift valley
Shale oil yield of some deposits are quite high, for example Suman Undur deposit in Tamsag basin – 22% Eedemt deposit in Middle Gobi basin – 19.6% Uvdug Khooloin Gashuun in Middle Gobi basin – 11.7%
Shale oil resources was estimated to be 22.7 billion tones (only 7.8% of total known area)
Level of survey is very low. Further survey is required.
Thanks for your attention