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Romania Flysch Zone, Assessment Unit 40610201
0
5
10
15
20
25
30
35
40
45
50
1860 1880 1900 1920 1940 1960 1980 2000
DRILLING-COMPLETION YEAR
CU
M. N
EW
-FIE
LD
WIL
DC
AT
WE
LL
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
1860
1865
1870
1875
1880
1885
1890
1895
1900
1905
1910
1915
1920
1925
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
DRILLING-COMPLETION YEAR
NE
W-F
IEL
D W
ILD
CA
T W
EL
LS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20
OIL-FIELD RANK BY SIZE
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
First third of fields discovered
Second third of fields discovered
Third third of fields discovered
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
1 to
<2
2 to
<4
4 to
<8
8 to
<16
16 to
<32
32 to
<64
64 to
<12
8
128
to <
256
256
to <
512
512
to <
1,02
4
1,02
4 to
<2,
048
2,04
8 to
<4,
096
4,09
6 to
<8,
192
8,19
2 to
<16
,384
16,3
84 to
<32
,768
32,7
68 to
<65
,536
65,5
36 to
<13
1,07
2
131,
072
to <
262,
144
>=26
2,14
4
KNOWN OIL-FIELD SIZE (MMBO)
OIL
FIE
LD
S (
No
.)
Third third offieldsdiscovered
Second thirdof fieldsdiscovered
First third offieldsdiscovered
Romania Flysch Zone, Assessment Unit 40610201
0
100
200
300
400
500
600
700
1 to
<2
2 to
<4
4 to
<8
8 to
<16
16 to
<32
32 to
<64
64 to
<12
8
128
to <
256
256
to <
512
512
to <
1,02
4
1,02
4 to
<2,
048
2,04
8 to
<4,
096
4,09
6 to
<8,
192
8,19
2 to
<16
,384
16,3
84 to
<32
,768
32,7
68 to
<65
,536
65,5
36 to
<13
1,07
2
131,
072
to <
262,
144
>=26
2,14
4
KNOWN OIL-FIELD SIZE (MMBO)
VO
LU
ME
OF
OIL
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. K
NO
WN
OIL
VO
LU
ME
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. K
NO
WN
OIL
VO
LU
ME
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. O
IL F
IEL
DS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. O
IL F
IEL
DS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Romania Flysch Zone, Assessment Unit 40610201
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
GA
S/O
IL, O
IL F
IEL
DS
(C
FG
/BO
)
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
7
8
9
10
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
NG
L/G
AS
, OIL
FIE
LD
S (
BN
GL
/MM
CF
G)
Romania Flysch Zone, Assessment Unit 40610201
0
20
40
60
80
100
120
0 to <10 10 to<20
20 to<30
30 to<40
40 to<50
50 to<60
60 to<70
70 to<80
80 to<90
90 to<100
>=100
API GRAVITY (DEGREES)
RE
SE
RV
OIR
S IN
OIL
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 1 2 3 4 5 6
GAS-FIELD RANK BY SIZE
KN
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
First third of fields discovered
Second third of fields discovered
Third third of fields discovered
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
7
6 to
<12
12 to
<24
24 to
<48
48 to
<96
96 to
<19
2
192
to <
384
384
to <
768
768
to <
1,53
6
1,53
6 to
<3,
072
3,07
2 to
<6,
144
6,14
4 to
<12
,288
12,2
88 to
<24
,576
24,5
76 to
<49
,152
49,1
52 to
<98
,304
98,3
04 to
<19
6,60
8
196,
608
to <
393,
216
393,
216
to <
786,
432
786,
432
to <
1,57
2,86
4
>=1,
572,
864
KNOWN GAS-FIELD SIZE (BCFG)
GA
S F
IEL
DS
(N
o.)
Third third offieldsdiscovered
Second thirdof fieldsdiscovered
First third offieldsdiscovered
Romania Flysch Zone, Assessment Unit 40610201
0
100
200
300
400
500
600
6 to
<12
12 to
<24
24 to
<48
48 to
<96
96 to
<19
2
192
to <
384
384
to <
768
768
to <
1,53
6
1,53
6 to
<3,
072
3,07
2 to
<6,
144
6,14
4 to
<12
,288
12,2
88 to
<24
,576
24,5
76 to
<49
,152
49,1
52 to
<98
,304
98,3
04 to
<19
6,60
8
196,
608
to <
393,
216
393,
216
to <
786,
432
786,
432
to <
1,57
2,86
4
>=1,
572,
864
KNOWN GAS-FIELD SIZE (BCFG)
VO
LU
ME
OF
GA
S (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
KN
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
KN
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. K
NO
WN
GA
S V
OL
UM
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. K
NO
WN
GA
S V
OL
UM
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
16
18
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. G
AS
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
16
18
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. G
AS
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, G
AS
FIE
LD
S (
m)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, G
AS
FIE
LD
S (
m)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
70
80
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
LIQ
UID
S/G
AS
, GA
S F
IEL
DS
(B
L/M
MC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
5
10
15
20
25
30
35
40
45
50
1860 1880 1900 1920 1940 1960 1980 2000
DRILLING-COMPLETION YEAR
CU
M. N
EW
-FIE
LD
WIL
DC
AT
WE
LL
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
1860
1865
1870
1875
1880
1885
1890
1895
1900
1905
1910
1915
1920
1925
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
DRILLING-COMPLETION YEAR
NE
W-F
IEL
D W
ILD
CA
T W
EL
LS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20
OIL-FIELD RANK BY SIZE
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
First third of fields discovered
Second third of fields discovered
Third third of fields discovered
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
16
1 to
<2
2 to
<4
4 to
<8
8 to
<16
16 to
<32
32 to
<64
64 to
<12
8
128
to <
256
256
to <
512
512
to <
1,02
4
1,02
4 to
<2,
048
2,04
8 to
<4,
096
4,09
6 to
<8,
192
8,19
2 to
<16
,384
16,3
84 to
<32
,768
32,7
68 to
<65
,536
65,5
36 to
<13
1,07
2
131,
072
to <
262,
144
>=26
2,14
4
GROWN OIL-FIELD SIZE (MMBO)
OIL
FIE
LD
S (
No
.)
Third third offieldsdiscovered
Second thirdof fieldsdiscovered
First third offieldsdiscovered
Romania Flysch Zone, Assessment Unit 40610201
0
100
200
300
400
500
600
700
1 to
<2
2 to
<4
4 to
<8
8 to
<16
16 to
<32
32 to
<64
64 to
<12
8
128
to <
256
256
to <
512
512
to <
1,02
4
1,02
4 to
<2,
048
2,04
8 to
<4,
096
4,09
6 to
<8,
192
8,19
2 to
<16
,384
16,3
84 to
<32
,768
32,7
68 to
<65
,536
65,5
36 to
<13
1,07
2
131,
072
to <
262,
144
>=26
2,14
4
GROWN OIL-FIELD SIZE (MMBO)
VO
LU
ME
OF
OIL
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. G
RO
WN
OIL
VO
LU
ME
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. G
RO
WN
OIL
VO
LU
ME
(M
MB
O)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. O
IL F
IEL
DS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. O
IL F
IEL
DS
(N
o.)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Romania Flysch Zone, Assessment Unit 40610201
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
GA
S/O
IL, O
IL F
IEL
DS
(C
FG
/BO
)
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
7
8
9
10
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
NG
L/G
AS
, OIL
FIE
LD
S (
BN
GL
/MM
CF
G)
Romania Flysch Zone, Assessment Unit 40610201
0
20
40
60
80
100
120
0 to <10 10 to<20
20 to<30
30 to<40
40 to<50
50 to<60
60 to<70
70 to<80
80 to<90
90 to<100
>=100
API GRAVITY (DEGREES)
RE
SE
RV
OIR
S IN
OIL
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 1 2 3 4 5 6
GAS-FIELD RANK BY SIZE
GR
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
First third of fields discovered
Second third of fields discovered
Third third of fields discovered
Romania Flysch Zone, Assessment Unit 40610201
0
1
2
3
4
5
6
6 to
<12
12 to
<24
24 to
<48
48 to
<96
96 to
<19
2
192
to <
384
384
to <
768
768
to <
1,53
6
1,53
6 to
<3,
072
3,07
2 to
<6,
144
6,14
4 to
<12
,288
12,2
88 to
<24
,576
24,5
76 to
<49
,152
49,1
52 to
<98
,304
98,3
04 to
<19
6,60
8
196,
608
to <
393,
216
393,
216
to <
786,
432
786,
432
to <
1,57
2,86
4
>=1,
572,
864
GROWN GAS-FIELD SIZE (BCFG)
GA
S F
IEL
DS
(N
o.)
Third third offieldsdiscovered
Second thirdof fieldsdiscovered
First third offieldsdiscovered
Romania Flysch Zone, Assessment Unit 40610201
0
100
200
300
400
500
600
6 to
<12
12 to
<24
24 to
<48
48 to
<96
96 to
<19
2
192
to <
384
384
to <
768
768
to <
1,53
6
1,53
6 to
<3,
072
3,07
2 to
<6,
144
6,14
4 to
<12
,288
12,2
88 to
<24
,576
24,5
76 to
<49
,152
49,1
52 to
<98
,304
98,3
04 to
<19
6,60
8
196,
608
to <
393,
216
393,
216
to <
786,
432
786,
432
to <
1,57
2,86
4
>=1,
572,
864
GROWN GAS-FIELD SIZE (BCFG)
VO
LU
ME
OF
GA
S (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
GR
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
1
10
100
1,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
GR
OW
N G
AS
-FIE
LD
SIZ
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. G
RO
WN
GA
S V
OL
UM
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. G
RO
WN
GA
S V
OL
UM
E (
BC
FG
)
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
16
18
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
CU
M. G
AS
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
2
4
6
8
10
12
14
16
18
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. G
AS
FIE
LD
S (
No
.)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
1860 1880 1900 1920 1940 1960 1980 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, G
AS
FIE
LD
S (
m)
Romania Flysch Zone, Assessment Unit 40610201
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
0 5 10 15 20 25 30 35 40 45 50
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, G
AS
FIE
LD
S (
m)
Romania Flysch Zone, Assessment Unit 40610201
0
10
20
30
40
50
60
70
80
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
MEAN RESERVOIR DEPTH (m)
LIQ
UID
S/G
AS
, GA
S F
IEL
DS
(B
L/M
MC
FG
)
Romania Flysch Zone, Assessment Unit 40610201Volumes of Discovered Petroleum
[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. MMBNGL, million barrels of natural gas liquids. Fields containing less than 1 MMBO in oilfields or 6 BCFG in gas fields were not considered in the assessment. Fields were classified as oil or gas by the USGS. Fields without reported discoverydates were not included. NA means not applicable and is shown for volumes where only one field is present. Calculated values may not be equal to the
sums of the component values because numbers have been independently rounded.]
Known (Discovered) Volumes Grown (Discovered) VolumesField Type Number Number
of Fields Oil (MMBO) Gas (BCFG) NGL (MMBNGL) of Fields Oil (MMBO) Gas (BCFG) NGL (MMBNGL)
Oil Fields 56 1,846 1,981 3 57 2,275 2,558 3Gas Fields 17 1 1,227 9 17 1 1,673 13
Fields <1 MMBOE 36 2 14 0 35 2 19 0
All Fields 109 1,849 3,222 11 109 2,278 4,250 16
Page 1
Romania Flysch Zone, Assessment Unit 40610201Discovery-History Sequence
[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. Fields containing less than 1 MMBO in oil fields or 6 BCFG in gas fields werenot considered in the assessment. Fields were classified as oil or gas by the USGS. The first half or third shows year of first field discovery
as well as end of period. NA means not applicable and is shown where fewer than four fields are present.]
Discovery-History Sequence - Known (Discovered) VolumesFieldType Year Number of Total Mean Median
(End of Period) Fields Volume Size Size
Oil Fields Known Sizes (MMBO)First third 1860-1953 19 711 37 29Second third 1965 19 654 34 15Third third 1992 18 481 27 21
All Oil Fields 56 1,846 33 22Gas Fields Known Sizes (BCFG)
First third 1913-1963 6 560 93 51Second third 1977 6 454 76 33Third third 1985 5 213 43 30
All Gas Fields 17 1,227 72 36
Page 2
Romania Flysch Zone, Assessment Unit 40610201Discovery-History Sequence
[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. Fields containing less than 1 MMBO in oil fields or 6 BCFG in gas fields werenot considered in the assessment. Fields were classified as oil or gas by the USGS. The first half or third shows year of first field discovery
as well as end of period. NA means not applicable and is shown where fewer than four fields are present.]
Discovery-History Sequence - Grown (Discovered) VolumesFieldType Year Number of Total Mean Median
(End of Period) Fields Volume Size Size
Oil Fields Grown Sizes (MMBO)First third 1860-1953 19 769 40 36Second third 1964 19 737 39 17Third third 1992 19 768 40 30
All Oil Fields 57 2,275 40 27Gas Fields Grown Sizes (BCFG)
First third 1913-1963 6 721 120 66Second third 1977 6 631 105 47Third third 1985 5 321 64 45
All Gas Fields 17 1,673 98 50
Page 3
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