Mesozoic Sandstone Reservoirs, Assessment Unit 11500101

Mesozoic Sandstone Reservoirs, Assessment Unit 11500101

0

1

2

3

4

5

1970 1975 1980 1985 1990 1995 2000

DRILLING-COMPLETION YEAR

CU

M. N

EW

-FIE

LD

WIL

DC

AT

WE

LL

S (

No

.)


0

1

2

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


1

10

100

1,000

10,000

0 1 2 3 4

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

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

200

400

600

800

1,000

1,200

1,400

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

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 1 2 3 4

CUM. NEW-FIELD WILDCAT WELLS (No.)

KN

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


0

500

1,000

1,500

2,000

2,500

3,000

3,500

1970 1975 1980 1985 1990 1995 2000


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

500

1,000

1,500

2,000

2,500

3,000

3,500

0 1 2 3 4


CU

M. K

NO

WN

OIL

VO

LU

ME

(M

MB

O)


0

1

2

3

4

5

6

7

8

9

1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

1

2

3

4

5

6

7

8

9

0 1 2 3 4


CU

M. O

IL F

IEL

DS

(N

o.)


0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

0 1 2 3 4


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

200

400

600

800

1,000

1,200

0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000

MEAN RESERVOIR DEPTH (m)

GA

S/O

IL, O

IL F

IEL

DS

(C

FG

/BO

)


0

10

20

30

40

50

60

70

80

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

1

2

3

4

5

1970 1975 1980 1985 1990 1995 2000


CU

M. N

EW

-FIE

LD

WIL

DC

AT

WE

LL

S (

No

.)


0

1

2

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995


NE

W-F

IEL

D W

ILD

CA

T W

EL

LS

(N

o.)


1

10

100

1,000

10,000

0 1 2 3 4

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

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

200

400

600

800

1,000

1,200

1,400

1,600

1,800

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

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 1 2 3 4


GR

OW

N O

IL-F

IEL

D S

IZE

(M

MB

O)


0

500

1,000

1,500

2,000

2,500

3,000

3,500

1970 1975 1980 1985 1990 1995 2000


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

500

1,000

1,500

2,000

2,500

3,000

3,500

0 1 2 3 4


CU

M. G

RO

WN

OIL

VO

LU

ME

(M

MB

O)


0

1

2

3

4

5

6

7

8

9

1970 1975 1980 1985 1990 1995 2000


CU

M. O

IL F

IEL

DS

(N

o.)


0

1

2

3

4

5

6

7

8

9

0 1 2 3 4


CU

M. O

IL F

IEL

DS

(N

o.)


0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

1970 1975 1980 1985 1990 1995 2000


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

0 1 2 3 4


RE

SE

RV

OIR

DE

PT

H, O

IL F

IEL

DS

(m

)


0

200

400

600

800

1,000

1,200

0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000

MEAN RESERVOIR DEPTH (m)

GA

S/O

IL, O

IL F

IEL

DS

(C

FG

/BO

)


0

10

20

30

40

50

60

70

80

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

.)

Mesozoic Sandstone Reservoirs, Assessment Unit 11500101Volumes 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 8 2,286 855 0 8 3,003 1,217 0Gas Fields 1 NA NA NA 1 NA NA NA

Fields <1 MMBOE 0 0 0 0 0 0 0 0

All Fields 9 2,286 943 0 9 3,003 1,392 0

Page 1

Mesozoic Sandstone Reservoirs, Assessment Unit 11500101Discovery-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 1974-1976 4 2,206 551 508Second half 1984 4 80 20 13

All Oil Fields 8 2,286 286 35Gas 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

Mesozoic Sandstone Reservoirs, Assessment Unit 11500101Discovery-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 1974-1976 4 2,888 722 589Second half 1984 4 115 29 18

All Oil Fields 8 3,003 375 50Gas 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

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Mesozoic Sandstone Reservoirs, Assessment Unit 11500101