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ERTH4303 Wikipedia Reflective Essay

During the article evaluation part of this assignment, I learned that maintaining neutrality and avoiding bias is very important. This is important as it becomes difficult to impart valuable information if there is any bias present in that information, since the goal is not to sway the reader’s opinion. For the article I chose, I decided to approach critiquing it by keeping an open mind. Based on reading the article, it kept a very good neutrality, but it was very short. Therefore, I decided to add to almost every section of the article.

The article I chose to edit was on the Leduc Formation in Alberta, Canada. It is known for its large hydrocarbon reservoirs and is important to the Canadian Petroleum Industry. As I mentioned earlier, this Wikipedia article was very short and required additional information in almost every section. I decided to add to the Lithology, Oil and Gas Production, and the Relationship to Other Units sections. The article now compared to other versions of it gives more information about the lithological units and facies in the Leduc Formation. It also discusses more current or recent Oil and Gas operations that have taken place in or around the Leduc Formation and Leduc area than it did before. Finally, the Wikipedia article now has more information on how the Leduc Formation is related to nearby formations such as the Swan Hills formation. This new information helps to give readers the bigger picture of what has taken place in and around the Leduc Formation.

There was also a peer review that the class did for the assignment. The process involved us reading the sandbox of our peers, and then leaving comments on their talk page about what they could add or remove. I contributed to my peers’ articles by recommending that they remember to remain neutral in the topic and not try to prove any points. For the most part, the articles that I reviewed had been edited very well. The comments left on my talk page said that I would benefit in adding a bit more information to what I had, but were generally positive.

I did not receive any feedback from any other Wikipedia editors on the article that I chose to edit. I believe this could be due to the fact that this article is on a topic that is not searched up too often. Hydrocarbon reservoirs and/or oil and gas production are topics that could be edited often, however one specific reservoir may not get as much attention.

By contributing to Wikipedia I have learned that maintaining neutrality when writing about a topic in order to teach people about that topic is imperative. Any bias in the writing makes it non-trustworthy, since the information is being skewed by the writer’s perspective and the reader may not agree with it. This assignment is similar to others that I have had in the past. The only difference is that with most papers I have written is that I was trying to prove a point with them. This was the first time I wrote something with a completely neutral attitude. Wikipedia can be used to improve knowledge about this topic to the public by giving them information about the geology of the location (types of rocks, features), history of the oil and gas production in the region, and how the formation is related to the geology and formations around it. This is important because it is able to give the readers more knowledge about the history of oil and gad production in Canada, and give them a general understanding of the region's history.

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Leduc Formation

Lithology [edited]
The Leduc Formation consists of fossil reefs that are highly porous, which makes them excellent reservoirs for oil and gas. They were deposited as limestone and mudstone in shallow water reef environments. Stromatoporoids were the primary reef-building organisms, and rock-types range from skeletal mudstones and floatstones to finer grained muddy packstones and wackestones.

Many, but not all, of the reefs were later subjected to dolomitization during diagenesis, which increased their porosity, and they now consist of dolostone rather than limestone. [1] ''The dolomitization that took place in the region has increased the porosity primarily in the more deeply buried lagoonal back reef facies. The pre-existing porosity has also been preserved well due to the dolomitization. Porosity in the region is dominated by vuggy, moldic, intercrystalline, as well as fracture types of porosity. Generally, the mean porosity of the Leduc Formation is 5.2%, with the permeability of the rocks in the region being an even spread .''

''Anhydrite is also common in the Leduc Formation, along with the replacement dolomitization.

Oil and gas production [edited]
The Leduc Formation is a major producer of oil and gas in central Alberta. The Leduc No. 1 well which was drilled in 1947 produced 50 thousand cubic metres (more than 300 thousand barrels) of oil[5] and marked the beginning of the post-war Albertan oil boom. The Leduc No. 1 oil well helped to facilitate a large population boom in the cities of Calgary and Edmonton also following World War 2. The discovery and subsequent production from the wells also lead to a large economic boom in Alberta, which nowadays puts Calgary among one of the forefront producers of oil in North America.

The Strachan and Ricinus West gas fields, discovered in 1967 and 1969, also produce from Late Devonian Leduc-age reefs. ''These reefs were found using seismic Common-Depth Point (CDP) techniques, which took place primarily in the Western Canada Sedimentary Basin. The well that was crucial to the discovery of these two formations was drilled in 1955, and yielded gas as well as some salt water. Reef buildup of the Strachan and Ricinus gas field reefs are 900 and 800 ft respectively.''

Relationship to other units [edited]
In central Alberta the Leduc Formation conformably overlies the platform limestones and dolostones of the Cooking Lake and Beaverhill Lake Formations. In northern Alberta near the Peace River Arch it rests on older red beds or on the Granite Wash. The Leduc reefs are surrounded by shales of the Duvernay and Ireton Formations and the Woodbend Group that were deposited in non-reefal, open marine environments.

The Leduc reefs are the same ages as, but not contiguous with, the reefs of the Cairn Formation which are located farther west. Because the Leduc reefs are nowhere exposed at surface, the extensive outcrops of the Cairn reefs in the Canadian Rockies have been studied to increase the understanding of the Leduc reefs.

''Near the Leduc Formation there is also the Swan Hills Formation. These two formations hold some similarities, such as the types of rocks and certain diagenetic processes. Rock types in both regions are dominated by limestones and dolostones. Dolomitization has taken place in both formations however it is more dominant in the Leduc Formation. Evaporites such as Anhydrites are also more present in the Leduc Formation, however they are also present in the Swan Hills Formation. ''

''The Swan Hills formation also holds some differences to the Leduc Formation. The porosity types in both formations differ, and the types of fossilized biota also differ. Vuggy, moldic, intercrystalline, and fracture porosities are present in the Leduc Formation whereas the primary porosities in the Swan Hills Formation are interparticle and interfossil. One of the primary fossilized biota in the Leduc Formation are stromatoporoids, whereas the primary fossil type in the Swan Hills Formation are Amphipora. ''

Source for Lithology and Relationship to Other Units sections:

- http://www.collectionscanada.gc.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ55089.pdf

Sources for Oil and Gas Production Section:

- Jaremko, Gordon (1997-02-13). "Oil built the Calgary skyline". Calgary Herald. p. L13.

- McKenzie-Brown, Calgary Rising Oilweek, November 2011

- https://pubs.geoscienceworld.org/books/book/1433/chapter/107724343/strachan-and-ricinus-west-gas-fields-alberta

* Italics show added info*

References [to add]
[1] 10.1306/00aa7e14-1730-11d7-8645000102c1865d

[2]

[3] McKenzie, A.M. 1973

[4] https://pubs.geoscienceworld.org/books/book/1433/chapter/107724343/strachan-and-ricinus-west-gas-fields-alberta