Chahal's Gyan Ki Baat
UNCONVENTIONAL GAS RESERVOIRS
WHAT ARE UNCONVENTIONAL GAS RESERVOIRS?
- These occur in relatively impermeable sandstones unlike Conventional reservoirs.
- Found in joints-fractures, shales and coal.
- Due to use of technology, they are expensive to exploit.
- Examples- Tight gas, shale gas, and coalbed methane.
WHAT IS COALBED METHANE?
- Fair quantities of methane are trapped within coal.
- Also remains as free gas in the joints and fractures.
- It can be get by drilling wells.
- It is now an important source of natural gas.
- It contains very little hydrocarbons.
- India does commercial recovery of coalbed methane.
- India has around 700-950 billion cubic metre.
WHAT IS SHALE GAS?
- It is a natural trapped within shale formations.
- They are found 2,500-5,000 m below the earth’s surface.
- They are deeper than conventional crude oil.
- The process of extracting requires deep vertical and horizontal drilling.
- The most common way is ‘hydraulic fracturing’.
WHERE IS SHALE GAS IN INDIA?
Important reserves are :
- Cambay
- Krishna – Godavari
- Cauvery
- Damodar Valley
- Upper Assam, Arakan Basin
- Godavari,
- Rajasthan
- Vindhya Basins.
WHERE IS SHALE GAS IN THE WORLD?
