Consider the following regarding shale gas :
1. It is found in igneous rock formations, acting as both source and reservoir.
2. It is primarily extracted through vertical drilling methods.
3. Hydraulic fracturing is an essential technique used in the extraction of shale gas.
4. The extraction of shale gas is water-intensive.
How many of the above statements are correct ?
(a) Only one
(b) Only two
(c ) Only three
(d) All four
Explanation Statement 1 is not correct: Shales are fine-grained sedimentary rocks that can contain petroleum and natural gas. They are often found next to rocks with drinkable water, known as 'aquifers'. Shale gas is trapped under rocks with low permeability.
Statement 2 is not correct : Shale gas is primarily extracted through horizontal drilling methods, not vertical drilling methods.
Statement 3 is correct : Hydraulic fracturing (or fracking) is an essential technique used to extract shale gas by creating fractures in the rock formation.
Statement 4 is correct : The extraction of shale gas is considered a highly water-intensive process, primarily due to the technique of hydraulic fracturing ("fracking") which requires large volumes of water to fracture the shale rock and release the trapped gas; this makes shale gas extraction a significant concern regarding water usage in regions where it is practiced.
Kutos:Geography Expert
Hello! I am a Geography expert. You can ask any question or request a detailed analysis related to this topic.
