Tertiary Lacustrine, Assessment Unit 31270101 - USGS · Tertiary Lacustrine, Assessment Unit...

Tertiary Lacustrine, Assessment Unit 31270101

0

20

40

60

80

100

120

140

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

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


1

10

100

1,000

10,000

0 5 10 15 20 25 30 35 40

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


0

5

10

15

20

25

30

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


0

1,000

2,000

3,000

4,000

5,000

6,000

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

1,000

10,000

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

1,000

10,000

0 20 40 60 80 100 120 140

CUM. NEW-FIELD WILDCAT WELLS (No.)

KN

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


0

5,000

10,000

15,000

20,000

25,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

5,000

10,000

15,000

20,000

25,000

0 20 40 60 80 100 120 140


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

20

40

60

80

100

120

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

20

40

60

80

100

120

0 20 40 60 80 100 120 140


CU

M. O

IL F

IEL

DS

(N

o.)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 1,000 2,000 3,000 4,000 5,000 6,000

MEAN RESERVOIR DEPTH (m)

GA

S/O

IL, O

IL F

IEL

DS

(C

FG

/BO

)


0

20

40

60

80

100

120

0 1,000 2,000 3,000 4,000 5,000 6,000


NG

L/G

AS

, OIL

FIE

LD

S (

BN

GL

/MM

CF

G)


0

10

20

30

40

50

60

70

80

90

100

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

.)


1

10

100

1,000

10,000

0 1 2 3 4

GAS-FIELD RANK BY SIZE

KN

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)

First half of fields discovered

Second half of fields discovered


0

1

2

3

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.)

Second halfof fieldsdiscovered

First half offieldsdiscovered


0

500

1,000

1,500

2,000

2,500

3,000

3,500

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

)


1

10

100

1,000

10,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


KN

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)


1

10

100

1,000

10,000

0 20 40 60 80 100 120 140


KN

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. K

NO

WN

GA

S V

OL

UM

E (

BC

FG

)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


CU

M. K

NO

WN

GA

S V

OL

UM

E (

BC

FG

)


0

1

2

3

4

5

6

7

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. G

AS

FIE

LD

S (

No

.)


0

1

2

3

4

5

6

7

0 20 40 60 80 100 120 140


CU

M. G

AS

FIE

LD

S (

No

.)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, G

AS

FIE

LD

S (

m)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


RE

SE

RV

OIR

DE

PT

H, G

AS

FIE

LD

S (

m)


0

20

40

60

80

100

120

0 1,000 2,000 3,000 4,000 5,000 6,000


LIQ

UID

S/G

AS

, GA

S F

IEL

DS

(B

L/M

MC

FG

)


0

20

40

60

80

100

120

140

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

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


1

10

100

1,000

10,000

0 5 10 15 20 25 30 35 40

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


0

5

10

15

20

25

30

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


0

1,000

2,000

3,000

4,000

5,000

6,000

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

1,000

10,000

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

1,000

10,000

0 20 40 60 80 100 120 140


GR

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


0

5,000

10,000

15,000

20,000

25,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

5,000

10,000

15,000

20,000

25,000

0 20 40 60 80 100 120 140


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

20

40

60

80

100

120

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

20

40

60

80

100

120

0 20 40 60 80 100 120 140


CU

M. O

IL F

IEL

DS

(N

o.)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 1,000 2,000 3,000 4,000 5,000 6,000


GA

S/O

IL, O

IL F

IEL

DS

(C

FG

/BO

)


0

20

40

60

80

100

120

0 1,000 2,000 3,000 4,000 5,000 6,000


NG

L/G

AS

, OIL

FIE

LD

S (

BN

GL

/MM

CF

G)


0

10

20

30

40

50

60

70

80

90

100

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

.)


1

10

100

1,000

10,000

0 1 2 3 4

GAS-FIELD RANK BY SIZE

GR

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)

First half of fields discovered

Second half of fields discovered


0

1

2

3

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.)

Second halfof fieldsdiscovered

First half offieldsdiscovered


0

500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

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

)


1

10

100

1,000

10,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


GR

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)


1

10

100

1,000

10,000

0 20 40 60 80 100 120 140


GR

OW

N G

AS

-FIE

LD

SIZ

E (

BC

FG

)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. G

RO

WN

GA

S V

OL

UM

E (

BC

FG

)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


CU

M. G

RO

WN

GA

S V

OL

UM

E (

BC

FG

)


0

1

2

3

4

5

6

7

1960 1965 1970 1975 1980 1985 1990 1995 2000


CU

M. G

AS

FIE

LD

S (

No

.)


0

1

2

3

4

5

6

7

0 20 40 60 80 100 120 140


CU

M. G

AS

FIE

LD

S (

No

.)


0

1,000

2,000

3,000

4,000

5,000

6,000

1960 1965 1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, G

AS

FIE

LD

S (

m)


0

1,000

2,000

3,000

4,000

5,000

6,000

0 20 40 60 80 100 120 140


RE

SE

RV

OIR

DE

PT

H, G

AS

FIE

LD

S (

m)


0

20

40

60

80

100

120

0 1,000 2,000 3,000 4,000 5,000 6,000


LIQ

UID

S/G

AS

, GA

S F

IEL

DS

(B

L/M

MC

FG

)

Tertiary Lacustrine, Assessment Unit 31270101Volumes 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 107 19,486 7,698 33 107 23,182 9,272 47Gas Fields 6 101 3,535 21 6 146 5,078 24

Fields <1 MMBOE 1 NA NA NA 1 NA NA NA

All Fields 114 19,587 11,233 53 114 23,328 14,350 72

Page 1

Tertiary Lacustrine, Assessment Unit 31270101Discovery-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 1961-1971 36 13,255 368 72Second third 1981 36 3,202 89 50Third third 1995 35 3,029 87 10

All Oil Fields 107 19,486 182 40Gas Fields Known Sizes (BCFG)

First half 1973-1980 3 3,400 1,133 200Second half 1990 3 135 45 50

All Gas Fields 6 3,535 589 80

Page 2

Tertiary Lacustrine, Assessment Unit 31270101Discovery-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 1961-1971 36 14,263 396 82Second third 1981 36 3,986 111 58Third third 1995 35 4,933 141 22

All Oil Fields 107 23,182 217 50Gas Fields Grown Sizes (BCFG)

First half 1973-1980 3 4,830 1,610 232Second half 1990 3 248 83 72

All Gas Fields 6 5,078 846 132

Page 3

Tertiary Lacustrine, Assessment Unit 31270101 - USGS · Tertiary Lacustrine, Assessment Unit...

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