rockdoc123 wrote:This has absolutely nothing to do with Peak Oil or conceptual reserves. The oil is still there....no doubt the URR for the fields are as accurate as can be.
I suggest that in addition to media reports you read the press release (which I quoted from) straight from Repsol themselves. The media have spun this to blame it on the Bolivians and deflect blame from Repsol. Here:
Bolivia
San Alberto and Sábalo
In the San Alberto and Sábalo fields, the downward revision in proved
reserves is mainly due to the following reasons:
o Although these fields have a short production history, the decline in
pressure in 2004 and 2005, together with new volumetric
calculations, has led to a reduction in the estimated hydrocarbons in
place for the purpose of estimating proved reserves.
................
o There has been a reduction of 526.7 million BOE.
Río Grande
Production performance following workovers that was significantly lower
than expected has led to a downward revision in the Río Grande and other
fields in this region of 61 million BOE.
ARGENTINA
Loma La Lata
As was previously disclosed to the market, a downward revision of proved
reserves in the amount of 72.6 million BOE was recorded as of December
31, 2004. The decline in pressure observed for this field in 2004 and 2005
indicated that a portion of the initial gas in place (IGIP) could not be
recoverable with reasonable certainty under present technical, economic
and operating conditions. In particular, the lack of balance between the
pressures detected in the various layers and zones of the field indicated a
limited interconnection between these layers and zones.
Commercial exploitation of those gas volumes without a connection to the
producing zones of the field will require the implementation of nonconventional
recovery methods, which would require pilot testing in order
to support the classification of the volumes as proved reserves.
All these reasons have lead to a downward revision of 252 M boe in proved reserves.
Chihuido de la Sierra Negra
Production performance of this field has been adversely affected by
multiple factors, including the effect of interrupted production in late
2004 and problems with injector equipment, which has caused a
downward deviation in short- and medium-term production estimates.
This updated evaluation of field performance has led to a downward
revision of 38.5 million stb in proved reserves.
Ramos
Balance of materials analysis incorporating the latest static pressures
observed for the field indicated a reduction in the IGIP, which in turn resulted in a downward revision of previous estimates of proved reserves
of 36.5 million BOE.
Aguada Toledo and Sierra Barrosa
This area has been used for underground gas storage during the summer
months. A reevaluation of the gas cap of the affected reservoirs has
downward revision in proved gas reserves of 22.7 million BOE.
Repsolrockdoc123 wrote:What has changed is the share of those reserves companies such as Repsol who have production sharing agreeements can report.
Only in Venezuela and Algeria is that the case where 52.4mboe and 17.7mboe respectively have been written down due to this.
rockdoc123 wrote:The drop in proven reserves is an accounting adjustment and nothing more.
Serious business for Repsol and their investors....doesn't mean diddly to Peak Oil.
Its more than an accounting adjustment hence their decision to bring in independent auditors:
Since the appointment of the new senior management team, in January 2005, Repsol YPF has taken a number of steps to enhance reserves controls and procedures, including:
o Creation of an independent Reserves Control Group in order to
separate the internal reserves audit function from the business units.
The Reserves Control Group is independent of the E&P business and
reports directly to Audit Committee on behalf of the Board of
Directors.
o Assignment by the Board of Directors to the Audit Committee of
oversight responsibility for reserves controls.
o Preparation, with the assistance of an outside petroleum engineering
consultant, of a new internal Reserves Reporting Manual.
o Company-wide training in the new Reserves Reporting Manual.
o Implemented a triennial plan for external audit of the reserves.
o Commissioned audits by two external petroleum engineering firms of
the San Alberto and Sábalo fields (Bolivia) and Loma La Lata
(Argentina)
I agree this is not directly a peak oil issue more a peak gas issue as 71% of reserves writed down were gas nevertheless it still raises serious issues over reserve accounting at IOCs where manipulation of the data can be hidden easily due to their large size.