Data
Package
Information in the Digital
Data Package
Each Data and Information Package has the seismic and well data available for the sector offered for Brasil Round 8.
The Data Package for Santos basins includes the final report of the project made through agreement by ANP.
The DVD is divided into 2 sections and contains general information about the basins and the data package. The section “Data Package Information” contains a text with detais about the Data Package organization and content of the Data Package.
The section “Basin Information” includes the geological summaries, exploration history and general information on the location and petroleum system of all the basins and sectors included in this Round. There are also gravimetric and magnetometric maps, stratigraphic charts, structural framework and geological cross-sections of the basin are also available.
DVD Content – Well Data
Due the large amount of data to be included in the packages, ANP decided to store the well data in DVD media (4.7Gbytes).
For the mature basins a well selection was made using the following criteria:
» Wells with hydrocarbons (HC) (included from oilfield discovery well to dry well with oil trace). A distribution with at least one well per block was selected. In this criterion no wells located in oilfields or development areas were selected.
» Wells with seismic reference (time x depth table).
» Dry wells without HC. In blocks where none of the above criteria were matched, preference was given to deeper wells.
» Wells located in producing oilfields or those under development. Preference was given to wells classified as oilfield discovery wells.
Well Data
There are five kinds of well data:
» General Well File (Arquivo Geral de Poços - AGP, in Portuguese);
» Composite Logs;
» Geochemistry data;
» Well files;
» Well log curves.
The characteristics of each type of well data are described below.
In general, none of the existing databases are complete. Although the AGP and the Well Files are complementary in many aspects, an absent data in one of them may frequently be found in the other.
In Brasil Round 8 data packages include data from wells drilled recently. The data sets that the ANP requests from operators for these wells is still being consolidated, therefore the available data is heterogeneous in content and quality.
General Well File
The General Well File (Arquivo Geral de Poços – AGP) is a digital database. It comprises, among other data, coordinates, lithostratigraphy and chronostratigraphy, log headers, time x depth tables, formation test results and interpreted lithologies for each sampled depth in the well. All this information has different origins, and can include the well files. The degree of updating is quite diverse according to the period or the region and the AGP is not available for most of the recently drilled wells.
The AGP was retrieved in ASCII format, then formatted to fit standard page sizes and converted to PDF. The AGPs are located in the directory “AGP_General well files”.
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, where these curves existed in the database.
For some wells drilled recently, the composite logs were scanned from paper copies provided by the operators.
The composite logs are located below the Well data section of the CD ROM for each basin.
The composite logs were created in PDF format files and included in the directory “Perfil composto_Composite logs”.
Well Files
The well files comprise public reports relative to 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 done after the actual drilling of the well. As in the other databases, these files are not always complete. The majority of these reports are available in Portuguese only, many documents being handwritten.
The multiple files relative to each well file were converted to a single PDF file. This PDF file has a 3 level navigation: GEO for Geology, PER for Drilling and PRO for Production. The file is indexed by the title of the document. The well files are included in the directory “Pastas de poço_well files”.
Geochemistry data
Geochemistry analysis data is available for a large number of wells and is included in the directory “Geoquímica_Geochemistry”, in ASCII format.
Log curves
Log curves data in LIS format were retrieved from the ANP’s databank (BDEP). The files were also recorded in LAS format, with the exception of the recently drilled wells.
The LAS curves were combined (spliced). When one kind of curve (GR for example), from the same tool or even different tools, is repeated over one interval, more than one curve was generated.
The log curves are included in the directory “curvas de perfil_well logs”.
Seismic Data
Post-stack data has specially been made available. The seismic data selection followed the criteria below:
» All processed 2D lines digitally-stored on ANP’s Database for the onshore sectors, were included;
» A set of selected 2D lines for the offshore sectors, to allow the companies to develop a wider understanding about the geology and potential of the areas under offer.
Besides the UTM coordinates in the SEGY file headers, separate files were provided on the tape with the name (UKOOA) containing them. 
