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Proved oil and gas reserves – Changes

The tables present changes in the reserves of (i) Shell subsidiaries without deduction of the reserves attributable to non-controlling interest holders in our subsidiaries and (ii) the Shell share of equity-accounted investments. Changes in proven minable oil sands reserves are reported separately for 2007–2008. As a result of SEC rule changes, these proven minable oil sands reserves have been converted to synthetic crude oil proved reserves and from 2009 onwards these are included in the proved oil and gas reserves.

 

PROVED CRUDE OIL AND NATURAL GAS LIQUIDS, SYNTHETIC CRUDE OIL AND BITUMEN RESERVES CHANGES FOR SHELL SUBSIDIARIES AND EQUITY-ACCOUNTED INVESTMENTS [A][C] (AT DECEMBER 31)

MILLION BARRELS

 

2011

2010

2009

2008

2007

Revisions and reclassifications

190

856

1,205[B]

242

164

Improved recovery

34

66

42

54

59

Extensions and discoveries

326

161

617

51

225

Purchases of minerals in place

–

59

–

4

–

Sales of minerals in place

(37)

(57)

(1)

(65)

(206)

Total additions including
  year-average/end price effects

513

1,085

1,863

286

242

Production

(611)

(626)

(616)

(619)

(663)

 

PROVED NATURAL GAS RESERVES CHANGES FOR SHELL SUBSIDIARIES AND EQUITY-ACCOUNTED INVESTMENTS [A][C][D] (AT DECEMBER 31)

THOUSAND MILLION SCF

 

2011

2010

2009

2008

2007

Revisions and reclassifications

899

829

4,688

4,184

1,388

Improved recovery

3

42

1

–

1

Extensions and discoveries

3,504

1,288

4,326

968

3,636

Purchases of minerals in place

–

237

16

448

1

Sales of minerals in place

(394)

(743)

–

(19)

(5,275)

Total additions including
  year-average/end price effects

4,012

1,653

9,031

5,581

(249)

Production

(3,485)

(3,573)

(3,315)

(3,137)

(2,998)

 

PROVEN MINABLE OIL SANDS RESERVES CHANGES (AT DECEMBER 31)

MILLION BARRELS

 

 

 

 

2008

2007

Revisions and reclassifications

 

 

 

(85)

6

Extensions and discoveries

 

 

 

–

–

Total additions including year-end price effects

 

 

(85)

6

Production

 

 

 

(29)

(29)

 

TOTAL PROVED OIL AND GAS RESERVES CHANGES [A][C][E][F] (AT DECEMBER 31)

MILLION BOE

 

2011

2010

2009

2008

2007

[A]

2009–2011 includes proved reserves associated with volumes consumed in operations. These volumes were not included in previous years.

[B]

Excludes the 997 million barrels of previously booked proven minable oil sands reserves.

[C]

Year-end price effect for 2007 and 2008; year-average price effect for 2009–2011.

[D]

These quantities have not been adjusted to standard heat content.

[E]

Natural gas volumes are converted to oil equivalent using a factor of 5,800 scf per barrel. Rounding difference may occur in estimate of gas reserves conversion from scf to boe.

[F]

Proven minable oil sands included for 2007–2008.

Revisions and reclassifications

345

999

2,013[B]

878

409

Improved recovery

35

73

42

54

59

Extensions and discoveries

930

383

1,363

219

853

Purchases of minerals in place

–

100

3

81

–

Sales of minerals in place

(105)

(185)

(1)

(68)

(1,115)

Total additions including
  year-average/end price effects

1,205

1,370

3,420

1,164

206

Year-average/end price effects

(235)

(198)

260

19

(183)

Total additions excluding
  year-average/end price effects

1,440

1,568

3,160

1,145

389

Total additions excluding acquisitions
  and divestments and excluding
  year-average/end price effects

1,545

1,753

3,161

1,213

1,504

Production

(1,212)

(1,242)

(1,187)

(1,189)

(1,210)

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