Seismic Grids and Fault data (BBHR). Hydrocarbon Migration and Seepage in the Timor Sea and Browse Basin. An Integrated SAR and Geological Study GIS.

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

[back to top]

Dataset citation

ANZLIC unique identifier: ANZCW0703003332

Title: Seismic Grids and Fault data (BBHR). Hydrocarbon Migration and Seepage in the Timor Sea and Browse Basin. An Integrated SAR and Geological Study GIS.

[back to top]

Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

[back to top]

This is the interpretation of the Browse Basin High Resolution Study. The study used a 5,265 km grid of regional, high-resolution seismic reflection data (AGSO Survey BBHR/175), the intergration of sequence stratigraphic analsys of seismic data and of 21 wells, structural mapping, geochemical analysis, and geohistory modelling of potential source rocks.

This metatdata will only be focusing on the seismic (structure) grids and the intrepretated faults from the report.

There is both raster and vector data.

The vector data (faults and holes in data) are located in "/timor_gis/geological/agso_BBHR_flts".

The raster images (seismic structures BIL images) are located in "/timor_gis/grids/horizon_grids/agso_bbhr".

ANZLIC search words:

ENERGY Petroleum Exploration
MARINE Mapping
MARINE Geology and Geophysics Research

Spatial domain:

locality map

Geographic extent name: AUSTRALIA INCLUDING EXTERNAL TERRITORIES - AUSAAT - Australia - Australia

Geographic extent polygon: 121 -8.7, 127.5 -8.7, 127.5 -17, 121 -17, 121 -8.7,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:: North bounding latitude: -8.7 °; South bounding latitude: -17 °; East bounding longitude: 127.5 °; West bounding longitude: 121 °

[back to top]

Data currency

Beginning date: 2000-07-01

Ending date: 2000-11-05

[back to top]

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

[back to top]

Access

Stored data format:: DIGITAL - bil Band interleaved by line (BIL) image Geographic WGS84; DIGITAL - shp ArcView shape file ArcView Geographic WGS84

Available format type:: DIGITAL - shp ArcView shape file ArcView Geographic WGS84; DIGITAL - bil Band interleaved by line (BIL) image Geographic WGS84

Access constraints:

Licence required.

Free Data Download

[back to top]

Data quality

Lineage:

The original raw interpretation was done by AGSO in Geoquest. This interpretation was then imported into Petrosys where the final grids and vector data was made. The vector data was then exported into ARCVIEW format (shape files). Once the grids were finalised in Petrosys, they were then exported into ERMAPPER. Where there were converted into a format that ARCVIEW could read, BIL files. In ERMAPPER the grids where modified only by there colour spread. The colour table used for all grids was, 'rainbow_reversed'.

Vector Data - Therer is only line and polygon data. The only line file is the faults of one particular horizon. The polygon data is of actual holes in the grids. They are to be used when displaying the BIL images. These shape files are easily represented by the names of the BIL images.

Raster data - There are two different types of grids:

1. Time Structure - This represents the depth in two-way-time (TWT) of selected interpretated horizons. They can only be used for general usage, for they have no data attached to them, they are only georeferenced images. All time images have been given the 3-D look, this has only been done for asthetic looks.

2. Time Isopach - This represents the thickness in two-way-time (TWT) between two selected horizons. Again they can only be used for general usage, for they have no data attached to them, they are only georeferenced images. All the isopach images have been given the 'flat' look. This is because isopachs can not be reqresented in 3-D, geologically speaking.

Positional accuracy:

Both raster and vector data were originally made at 1:750000 scale. Any lower than that might distort the accuracy levels.

Vector Data - No analysis of the positional accuracy of any of the vector features has been undertaken, however due to the accuracy of the interpretation it can be considered that all vector features are within 100 metres of there true position.

Raster Data - All the raster images have a cell size of 500m. After the georeferencing of the images in ERMAPPER a positional accuracy can be 'estimated' within 100m. Each raster BIL file has a 'hdr' file. This is used to georeference the raster image.

Attribute accuracy:

Regarding the vector data the attributes are for naming purposes only.

This naming of the horizons was up to the interpreter and is therefore not prone to any error.

The classification of the horizon names are as follows:

iso - Time Isopach

struct - Time Structure

jcal - Early to Middle Jurassic Megasequence

kbase - Base Cretaceous Supersequence

kapt - Berriasian to mid-Aptian

ktur - Early Turonian

kbar - Barremian Uncomformity

kval - Valanginian Uncomformity