Cuanza-Namibe, Assessment Unit 72030401Cuanza-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

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

.)


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


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


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


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


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)


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)


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)


0

20

40

60

80

100

120

140

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

20

40

60

80

100

120

140

0 20 40 60 80 100 120 140 160


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

2

4

6

8

10

12

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

2

4

6

8

10

12

0 20 40 60 80 100 120 140 160


CU

M. O

IL F

IEL

DS

(N

o.)


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


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


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


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


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

)


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

.)


0

20

40

60

80

100

120

140

160

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. N

EW

-FIE

LD

WIL

DC

AT

WE

LL

S (

No

.)


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


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


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


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


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)


1

10

100

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


GR

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


1

10

100

0 20 40 60 80 100 120 140 160


GR

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


0

20

40

60

80

100

120

140

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

20

40

60

80

100

120

140

0 20 40 60 80 100 120 140 160


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

2

4

6

8

10

12

1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

2

4

6

8

10

12

0 20 40 60 80 100 120 140 160


CU

M. O

IL F

IEL

DS

(N

o.)


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


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


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


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


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

)


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

Documents

Cuanza-Namibe, Assessment Unit 72030401Cuanza-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