In the October 2000 issue Petroleum Data Manager
(PDM) published the following status report from Mauro Ribeiro Morand
who is the PetroBank Project Coordinator for Petrobras.
The original Petrobras project to organize its seismic data was
initiated in the early ‘90’s. The IBM/PGS Petrobank
software in 1995 and contract was signed with PGS and MR-DPTS
in 1997 for the remastering of Petrobas’ seismic archive.
Remastering operations began for real in December 1997.
Changes
Since the project started, there have been considerable changes
in Brazil’s oil sector. The Petrobras monopoly has ended and
the Brazilian government has created a new agency, the ANP which
governs the petroleum industry’s activity in Brazil. The ANP
decided to put the Petrobras data into the public domain and to
refund Petrobras for the cost of the data itself and for the remastering
costs.
The public domain rules concern 5 year old seismic data, and 2 year
old well logs. This led to the concept of a single database, a national
repository based on PetroBank, sharing data management costs and
making data easily available to industry. The Banco de Dados E&P
(BDEP) has been on-line since April 2000. BDEP is a consortium of
oil and services companies, including (and sponsored by) ANP. ANP
has handed to CPRM (Brazilian Geological Service) the responsibility
to operate the bank. My personal involvement in the project is as
PetroBank Project Coordinator for Petrobras. Currently, we have
loaded well logs, about 80% of the post-stack seismics, and about
60% of the pre-stack seismic available in Brazil (acquired by Petrobras
in the monopoly period).
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Public domain
Most of this data is in the public domain and is now available to
industry. I think that the pre-stack part of the project is the most
exciting one, (sub-contracted to PGS and MR-DPTS). This project
was initiated in December 1997, and current status is:
1- About 800,000 pages of observer’s logs scanned (load
will finish next month).
2- Remaster to high capacity media and PetroBank load of 300,000 tapes
with backup generation.
Peak production of 18,000 tapes in one month.
3- Recovery of sticky tapes.
4- Original media destruction – 30,000 already
destroyed.
Confidence
Loading pre-stack data into PetroBank requires accurate metadata linking
files, geometry and shotpoint coordinates. Obtaining this information
requires a lot of effort, but it’s the only way to get high
quality, useable data, and to have enough confidence in the transcription
process to be able to destroy the originals The 300,000 tapes remastered
to date have been selected following the analysis of some 350,000
tapes (10% were duplicates and were discarded, and 4% missing something
– coordinates, obs logs). People often believe tape remastering
is straightforward work. It is not! Remastering is a complex process,
much more than just changing tapes. This work can add significant
value to the seismic archive.
Since this report a further 67,000 tapes were transcribed.
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