Notes about the digital data packages
This section contains information about the format and content of the digital Data Packages.
Each Basin has a Data Package with a CD-ROM and an 8 mm tape. The CD-ROM contains all general information, the well files data and the well log data, while the 8 mm tape contains the seismic data. Each of the data categories is described below.
The CD-ROM contains PDF, ASCII and LIS files (well log data). All files in PDF and ASCII formats were indexed, allowing a fast overview of the CD-ROM general content and a practical navigation between its topics, with the use of Adobe Acrobat Reader.
An additional CD-ROM contains general information on the Initial Tender Protocol, maps relative to Brazil Round 3, Brazilian infrastructure, E&P Databank (BDEP), government take, spec survey activities and the Brazilian legislation.
1. Structure The Initial page of the CD-ROM has 6 sections:
- Mapas / Maps
- Informações sobre a Bacia / Basin Information
- Blocos / Blocks
- Pastas de poços / Well files
- Notas sobre o pacote de dados
- Data Package Information
The latter two hold the necessary explanation for the best usage of the Data Package.
The section Maps contains basin, block and bathymetry data specific to Brazil Round 3. These maps were generated and recorded in a format compatible with quality printing up to A0 size. This section also includes the coordinates of all blocks offered in Brazil Round 3, both in latitude/longitude and polyconic projection.
The section Basin Information can be accessed from the Initial Page or through navigation from the Maps section. This section includes a Geologic Summary, with information about the basin location and the petroleum system. The Geologic Summary is available both in English and Portuguese. There is also information about the amount of seismic ever acquired and the number of wells ever drilled in the basin and the subset of this data included in the Data Package; gravimetric and magnetometric maps; stratigraphic charts; structural framework and geological cross-sections of the basin. The figures included in the text are also available individually in size and quality for printing up to A0 size.
The section Blocks can be accessed through the Initial Page or through navigation from the Basin Information section. It contains the blocks' location maps and maps of the available seismic and wells. It also contains well data of two kinds, described below in the Item Well Data.
The section Well Files comprises those reports available on each well.
2. Seismic data
There are three sets of seismic data: basin regional seismic (offshore basins only), stacked data located on the blocks and some selected pre-stack data.
The regional seismic comprises a number of selected lines, mostly outside the block's boundaries. Its objective is to give a wider understanding of the regional geology and the basin evolution.
The pre-stack data is available only for offshore basins and is limited to one or two lines per basin.
Its objective is to allow the companies to reprocess the data using their own processing flow.
The seismic lines within the block's boundaries were selected on the following criteria:
- All 2D processed lines digitally-stored at ANP databank (BDEP);
- 3D surveys digitally-stored at ANP databank, that have significant coverage on the blocks;
Data editing was restricted to the cutting of the lines 2 km beyond the block's limits.
The seismic data was exported in standard SEG-Y format directly to the 8 mm tapes.
3. Well data
There are two sets of well data: regional wells and wells located inside the blocks.
Regional wells have been made available for the offshore basins only. The main objective is to tie the regional seismic dataset, allowing a wider interpretation.
Inside the blocks, data from all exploratory wells drilled have been made available.
Well maps for each block are available in the Basins section of this website .
There are four kinds of well data:
- General Well File (Arquivo Geral de Poços - AGP, in Portuguese);
- Composite Logs;
- Geochemical data;
- Well files;
- Well log curves.
All these data have been made available for the wells located inside the blocks. The regional wells' datasets, on the other hand, do not include the well files. Each of the data sets are described below.
Not all the data are available for every well. The AGP and the well files are complimentary in some aspects and data absent in one may be found in the other.
3.1. General Well File
This comprises, among other data, coordinates, lithostratigraphy and chronostratigraphy, log headers, time versus depth tables, formation test results and interpreted lithologies for each sampled depth. All these data have different origins, and can include the well files. The degree of updating is quite diverse.
The files were retrieved in ASCII format, then formatted to fit standard page sizes and converted to PDF.
3.2. Composite Logs
The composite logs generated for each well include the interpreted lithology, hydrocarbon shows, lithostratigraphy and chronostratigraphy. A set of curves was selected, including Caliper, GR, DT, SP, RHOB, TTI and a resistivity curve, whenever these curves existed in the database. They are available in PDF format indexed to the respective well names.
3.3. Well Files
The well files comprise all reports on any single well. This includes the cuttings description (on site), drilling and production reports. It also includes additional, diverse laboratory analysis, such as tests on cores and cuttings, fluids sampling, production tests and other reports completed after the actual drilling of the well. The majority of these reports are available in Portuguese only.
3.4. Geochemical data
Geochemical data is available in ASCII format for a large number of wells, as indicated below:
- TOC: Total Organic Carbon (%);
- RESID: Insoluble organic carbon (%);
- S1: free hydrocarbons (mg/g);
- S2: hydrocarbons produced from thermal conversion of kerogen contained in the rock (mg/g);
- S3: CO2 produced during pyrolysis (mg/g);
- TMAX: temperature associated with the maximum generation of hydrocarbons starting from the thermal conversion of kerogen ( oC);
3.5. Well log curves
Well log curve data were retrieved from ANP E&P databank (BDEP) and recorded in LIS format.