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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Property Plant And Equipments [Line Items]  
Disclosure of detailed information about property, plant and equipment [text block]
 
Amounts in US000
 
Oil & gas

properties
 
 
Furniture,

equipment

and vehicles
 
 
Production

facilities and

machinery
 
 
Buildings

and

improvements
 
 
Construction in

progress
 
 
Exploration

and evaluation

‎
assets
(b)
 
 
Total
 
Cost at 1 January 2016
 
 
648,992
 
 
 
13,745
 
 
 
124,832
 
 
 
10,518
 
 
 
29,823
 
 
 
87,000
 
 
 
914,910
 
Additions
 
 
(3,531
)
(a)
 
 
406
 
 
 
466
 
 
 
-
 
 
 
20,322
 
 
 
18,181
 
 
 
35,844
 
Currency translation differences
 
 
16,132
 
 
 
126
 
 
 
2,077
 
 
 
35
 
 
 
73
 
 
 
790
 
 
 
19,233
 
Disposals
 
 
-
 
 
 
(22
)
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(22
)
Write-off / Impairment reversal
 
 
5,664
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(31,366
)
(c)
 
 
(25,702
)
Transfers
 
 
24,984
 
 
 
102
 
 
 
5,038
 
 
 
-
 
 
 
(17,292
)
 
 
(12,832
)
 
 
-
 
Cost at 31 December 2016
 
 
692,241
 
 
 
14,357
 
 
 
132,413
 
 
 
10,553
 
 
 
32,926
 
 
 
61,773
 
 
 
944,263
 
Additions
 
 
7,997
(a)
 
 
954
 
 
 
-
 
 
 
-
 
 
 
66,953
 
 
 
49,455
 
 
 
125,359
 
Currency translation differences
 
 
(1,142
)
 
 
(12
)
 
 
(147
)
 
 
(3
)
 
 
(62
)
 
 
(104
)
 
 
(1,470
)
Disposals
 
 
-
 
 
 
(112
)
 
 
-
 
 
 
(189
)
 
 
-
 
 
 
-
 
 
 
(301
)
Write-off
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(5,834
)
(d)
 
 
(5,834
)
Transfers
 
 
77,408
 
 
 
211
 
 
 
25,130
 
 
 
-
 
 
 
(61,827
)
 
 
(40,922
)
 
 
-
 
Cost at 31 December 2017
 
 
776,504
 
 
 
15,398
 
 
 
157,396
 
 
 
10,361
 
 
 
37,990
 
 
 
64,368
 
 
 
1,062,017
 
Additions
 
 
(5,753
)
(a)
 
 
1,706
 
 
 
-
 
 
 
-
 
 
 
81,961
 
 
 
43,515
 
 
 
121,429
 
Acquisitions (Note 35.3)
 
 
52,925
 
 
 
254
 
 
 
1,616
 
 
 
134
 
 
 
-
 
 
 
-
 
 
 
54,929
 
Currency translation differences
 
 
(11,525
)
 
 
(130
)
 
 
(884
)
 
 
(30
)
 
 
(15
)
 
 
(882
)
 
 
(13,466
)
Disposals
 
 
-
 
 
 
(46
)
 
 
(417
)
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(463
)
Write-off / Impairment reversal
 
 
5,109
 
 
 
-
 
 
 
(120
)
 
 
-
 
 
 
(7
)
 
 
(26,389
)
(e)
 
 
(21,407
)
Transfers
 
 
63,794
 
 
 
566
 
 
 
14,503
 
 
 
1,089
 
 
 
(59,332
)
 
 
(20,620
)
 
 
-
 
Assets held for sale (Note 35.2)
 
 
(163,544
)
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(163,544
)
Cost at 31 December 2018
 
 
717,510
 
 
 
17,748
 
 
 
172,094
 
 
 
11,554
 
 
 
60,597
 
 
 
59,992
 
 
 
1,039,495
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Depreciation and write-down at 1 January 2016
 
 
(321,173
)
 
 
(7,317
)
 
 
(60,614
)
 
 
(3,195
)
 
 
-
 
 
 
-
 
 
 
(392,299
)
Depreciation
 
 
(61,080
)
 
 
(2,702
)
 
 
(10,788
)
 
 
(920
)
 
 
-
 
 
 
-
 
 
 
(75,490
)
Disposals
 
 
-
 
 
 
8
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
8
 
Currency translation differences
 
 
(2,486
)
 
 
(38
)
 
 
(296
)
 
 
(16
)
 
 
-
 
 
 
-
 
 
 
(2,836
)
Depreciation and write-down at 31 December 2016
 
 
(384,739
)
 
 
(10,049
)
 
 
(71,698
)
 
 
(4,131
)
 
 
-
 
 
 
-
 
 
 
(470,617
)
Depreciation
 
 
(57,725
)
 
 
(1,948
)
 
 
(14,558
)
 
 
(844
)
 
 
-
 
 
 
-
 
 
 
(75,075
)
Disposals
 
 
-
 
 
 
73
 
 
 
-
 
 
 
38
 
 
 
-
 
 
 
-
 
 
 
111
 
Currency translation differences
 
 
930
 
 
 
8
 
 
 
24
 
 
 
5
 
 
 
-
 
 
 
-
 
 
 
967
 
Depreciation and write-down at 31 December 2017
 
 
(441,534
)
 
 
(11,916
)
 
 
(86,232
)
 
 
(4,932
)
 
 
-
 
 
 
-
 
 
 
(544,614
)
Depreciation
 
 
(72,130
)
 
 
(1,579
)
 
 
(17,958
)
 
 
(996
)
 
 
-
 
 
 
-
 
 
 
(92,663
)
Disposals
 
 
-
 
 
 
42
 
 
 
149
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
191
 
Currency translation differences
 
 
6,292
 
 
 
92
 
 
 
337
 
 
 
26
 
 
 
-
 
 
 
-
 
 
 
6,747
 
Assets held for sale (Note 35.2)
 
 
148,014
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
148,014
 
Depreciation and write-down at 31 December 2018
 
 
(359,358
)
 
 
(13,361
)
 
 
(103,704
)
 
 
(5,902
)
 
 
-
 
 
 
-
 
 
 
(482,325
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Carrying amount at 31 December 2016
 
 
307,502
 
 
 
4,308
 
 
 
60,715
 
 
 
6,422
 
 
 
32,926
 
 
 
61,773
 
 
 
473,646
 
Carrying amount at 31 December 2017
 
 
334,970
 
 
 
3,482
 
 
 
71,164
 
 
 
5,429
 
 
 
37,990
 
 
 
64,368
 
 
 
517,403
 
Carrying amount at 31 December 2018
 
 
358,152
 
 
 
4,387
 
 
 
68,390
 
 
 
5,652
 
 
 
60,597
 
 
 
59,992
 
 
 
557,170
 
 
(a)
Corresponds to the effect of change in estimate of assets retirement obligations.
 
(b)
Exploration wells movement and balances are shown in the table below; seismic and other exploratory assets amount to US$ 48,779,000 (US$ 53,764,000 in 2017 and US$ 53,523,000 in 2016).
 
(c)
Corresponds to the write-off of five wells drilled in previous years in the Chilean blocks for which no additional work would be performed, the loss generated by the write-off of the seismic cost for Llanos 62 Block in Colombia generated by the relinquishment of the area in September 2016. In addition, during September 2016, five blocks in Brazil were relinquished so the associated investment was written off.
 
(d)
Corresponds to five unsuccessful exploratory wells, one well drilled in Colombia (Llanos 34 Block), one well drilled in Brazil (REC-T-94 Block) and three non-operated wells drilled in Argentina (Puelen and Sierra del Nevado Blocks) in 2017. The charge also includes the loss generated by the write-off of the seismic cost for Campanario and Isla Norte Blocks in Chile generated by the relinquishment of 327 sq km in 2017.
 
(e)
Corresponds to nine unsuccessful exploratory wells, four wells drilled in Colombia (Tiple, Llanos 34 and Llanos 32 Blocks), two wells drilled in Brazil (POT-T-747 and POT-T-619 Blocks) and three wells drilled in Argentina (Puelen Block). The change also includes the write-off of a well and other exploration costs incurred in the Fell Block (Chile) in previous years and other exploration costs incurred in the VIM-3 Block (Colombia), and POT-T-882 and REC-T-93 Blocks (Brazil), for which no additional work would be performed.
The disclosure of exploration wells movement and balances [text block]
Amounts in US$ '000
 
Total
 
Exploration wells at 31 December 2016
 
 
8,250
 
Additions
 
 
35,299
 
Write-offs
 
 
(3,664
)
Transfers
 
 
(29,281
)
Exploration wells at 31 December 2017
 
 
10,604
 
Additions
 
 
43,103
 
Write-offs
 
 
(23,733
)
Transfers
 
 
(18,761
)
Exploration wells at 31 December 2018
 
 
11,213