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Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
160
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
DRILLING-COMPLETION YEAR
CU
M. N
EW
-FIE
LD
WIL
DC
AT
WE
LL
S (
No
.)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
14
16
1953
1955
1957
1959
1961
1963
1965
1967
1969
1971
1973
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1995
DRILLING-COMPLETION YEAR
NE
W-F
IEL
D W
ILD
CA
T W
EL
LS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
0 1 2 3 4 5 6
OIL-FIELD RANK BY SIZE
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
First half of fields discovered
Second half of fields discovered
Cuanza-Namibe, Assessment Unit 72030401
0
1
2
3
4
5
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
.)
Second halfof fieldsdiscovered
First half offieldsdiscovered
Cuanza-Namibe, Assessment Unit 72030401
0
5
10
15
20
25
30
35
40
45
50
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)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
KN
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
CU
M. K
NO
WN
OIL
VO
LU
ME
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. K
NO
WN
OIL
VO
LU
ME
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
CU
M. O
IL F
IEL
DS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. O
IL F
IEL
DS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Cuanza-Namibe, Assessment Unit 72030401
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Cuanza-Namibe, Assessment Unit 72030401
0
100
200
300
400
500
600
700
800
900
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000
MEAN RESERVOIR DEPTH (m)
GA
S/O
IL, O
IL F
IEL
DS
(C
FG
/BO
)
Cuanza-Namibe, Assessment Unit 72030401
0
1
2
3
4
5
6
7
8
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
.)
Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
160
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
DRILLING-COMPLETION YEAR
CU
M. N
EW
-FIE
LD
WIL
DC
AT
WE
LL
S (
No
.)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
14
16
1953
1955
1957
1959
1961
1963
1965
1967
1969
1971
1973
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1995
DRILLING-COMPLETION YEAR
NE
W-F
IEL
D W
ILD
CA
T W
EL
LS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
0 1 2 3 4 5 6
OIL-FIELD RANK BY SIZE
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
First half of fields discovered
Second half of fields discovered
Cuanza-Namibe, Assessment Unit 72030401
0
1
2
3
4
5
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
.)
Second halfof fieldsdiscovered
First half offieldsdiscovered
Cuanza-Namibe, Assessment Unit 72030401
0
10
20
30
40
50
60
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)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
1
10
100
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
GR
OW
N O
IL-F
IEL
D S
IZE
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
CU
M. G
RO
WN
OIL
VO
LU
ME
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
20
40
60
80
100
120
140
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. G
RO
WN
OIL
VO
LU
ME
(M
MB
O)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
CU
M. O
IL F
IEL
DS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
0
2
4
6
8
10
12
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
CU
M. O
IL F
IEL
DS
(N
o.)
Cuanza-Namibe, Assessment Unit 72030401
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
FIELD-DISCOVERY YEAR
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Cuanza-Namibe, Assessment Unit 72030401
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
0 20 40 60 80 100 120 140 160
CUM. NEW-FIELD WILDCAT WELLS (No.)
RE
SE
RV
OIR
DE
PT
H, O
IL F
IEL
DS
(m
)
Cuanza-Namibe, Assessment Unit 72030401
0
100
200
300
400
500
600
700
800
900
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000
MEAN RESERVOIR DEPTH (m)
GA
S/O
IL, O
IL F
IEL
DS
(C
FG
/BO
)
Cuanza-Namibe, Assessment Unit 72030401
0
1
2
3
4
5
6
7
8
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
.)
Cuanza-Namibe, Assessment Unit 72030401Volumes 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 10 103 56 0 11 121 63 0Gas Fields 0 0 0 0 0 0 0 0
Fields <1 MMBOE 15 3 3 0 14 3 4 0
All Fields 25 107 59 0 25 124 67 0
Page 1
Cuanza-Namibe, Assessment Unit 72030401Discovery-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 half 1955-1967 5 87 17 5Second half 1988 5 16 3 2
All Oil Fields 10 103 10 5Gas Fields Known Sizes (BCFG)
First third NA NA NA NA NASecond third NA NA NA NA NAThird third NA NA NA NA NA
All Gas Fields NA NA NA NA
Page 2
Cuanza-Namibe, Assessment Unit 72030401Discovery-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 half 1955-1972 6 98 16 6Second half 1990 5 23 5 4
All Oil Fields 11 121 11 5Gas Fields Grown Sizes (BCFG)
First third NA NA NA NA NASecond third NA NA NA NA NAThird third NA NA NA NA NA
All Gas Fields NA NA NA NA
Page 3