Elixir's progress to a commercial development, page-6

A geological fault is a break in the Earth's crust where two blocks of rock have moved relative to each other.

Gas flow can be affected by geological faults in a number of ways. First, faults can create pathways for gas to flow. When two blocks of rock move, they can create cracks or gaps that allow gas to escape. Second, faults can block gas flow. If a fault is located between a gas reservoir and a well, it can prevent the gas from flowing to the well. Third, faults can change the direction of gas flow. If a fault is angled, it can cause the gas to flow in a different direction than it would if the fault were not present.

The impact of a geological fault on gas flow depends on a number of factors, including the size and type of fault, the orientation of the fault, and the properties of the rocks involved.

A fault can block gas flow from a reservoir to a well. This can reduce the amount of gas that can be produced from the reservoir.
(which is probably the reason N8 didn't perform)

HOWEVER, N10 could be highly successful because: A fault can create a pathway for gas to flow from a reservoir to a well. This can increase the amount of gas that can be produced from the reservoir.