This natural gas atlas creates an inventory of the molecular and stable isotope signatures of natural gases from the relevant geologic units and locations in BC. See the basis for the play definitions in the MEM 2006a, b, c publications (see the reference page) and in Evans 2019 (see publications).

Here, the summary of the data, the actual data tables, the mapping results from those data tables, and the interpretive diagrams will be displayed. The associated interpretive diagrams from the thesis and other upcoming publications have not been inserted into this display yet. The maps should be viewed with the interpretive diagrams of Appendix B of Evans 2019 at hand.

Note: the well profiles are not included here, but are included in many of the publications.

The dataset has been refreshed as of the updated data on October 12, 2019. This has included a large number of archived records and new analysis bringing the total lines in the dataset to 41,222 records. Some minor data corrections have been completed with no change tracking, so this should be considered a complete replacement of the August 2019 dataset.

Do not consider the current dataset additive to the previous dataset - it is completely replacing it.

The database consists of 3 parts: the RAW data as directly downloaded from available sources; the Interim data as modified by BC-NGA to identify data issues; and the Primary data as further modified by BC_NGA to filter out errors and change fields and other minor corrections. If a file has been deemed "f", most of the fields other that basic identification are blank as not loaded. If a record has been deemed "f", the RAW and Interim data is retained, but the analysis are not continued to the Primary dataset. All of these tables are available in 2 formats: XLS and CSV (for faster download in remote locations).

The BC-NGA project, in addition to data and data display has prepared a number of publications. These are listed in a separate "folder" at Publication files.

In addition to the profiles shown in the thesis, the data was also represented in a series of maps where each play had a different number of variables being mapped depending on what data was available. This large comprehensive list of maps and links to the map files is available at Map files.

The maps were generated using basic kriging with a spherical algorithm and a Gaussian variogram. Declustering was done manually based on the data analysis. Many well test intervals have two or three gas analysis samples for molecular composition only. These samples are often inadequate to create a production profile and the geographic location is exactly the same. This creates estimation problems for the kriging algorithm and declustering is required. If all samples from a well test interval were flagged equally, only the first sample is used in mapping. If the first sample is problematic as identified in the flagging, the second or third sample is chosen. This declustering also applies to gas analysis from multiple legs on a single drilling pad, but instead of the first sample (usually the motherbore of a horizontal well), the horizontal leg with the longest reach and most frequent testing is used for mapping.

The maps presented here are not spatially enabled and location-based queries for data relationships should be forwarded to the project per the contact information, or referenced to the GIS material at Geoscience BC. Further work on using a web-ready data presentation (e.g., Tableau software) is under review for maps and interpretive diagrams.