India in the recent times has found it challenging to keep up the pace of exploration and production of crude oil to meet the rising demand. Currently India satisfies nearly 70% of its requirements through oil imports, a scenario that eventually results in pressurising Indian currency against unreasonable foreign currency escalation. As a result, it becomes imperative for India to explore various non-conventional fuels in addition to conventional fuels to meet its’ growing demand. In quest of it, it becomes interesting to understand the prospects of Shale Gas for India, its Shale Gas Exploration policy and challenges it might confront on both critical fronts i.e. being commercially viable and environment friendly.
What is Shale Gas?

Shale Gas means natural gas generated in-situ and retained in Shale matrix storage, adsorbed onto organic particles, or within fractures in shales of source rock origin and obtained there form through boreholes. Over the past decade, the combination of horizontal drilling and hydraulic fracturing has allowed access to large volumes of shale gas that were previously uneconomical to produce. The production of natural gas from shale formations has rejuvenated the natural gas industry in the United States.
Keep a view of Figure 01 to better understand the section. Because shales ordinarily have insufficient permeability to allow significant fluid flow to a well bore, most shales are not commercial sources of natural gas. Shale gas is one of a number of unconventional sources of natural gas; others include Coalbed methane, tight sandstones and methane hydrates. Shale gas areas are often known as resource plays (as opposed to exploration plays). The geological risk of not finding gas is low in resource plays, but the potential profits per successful well are usually also lower.
Shale has low matrix permeability, so gas production in commercial quantities requires fractures to provide permeability. Shale gas has been produced for years from shales with natural fractures; the shale gas boom in recent years has been due to modern technology in hydraulic fracturing (fracking) to create extensive artificial fractures around well bores.
Horizontal drilling is often used with shale gas wells, with lateral lengths up to 10,000 feet (3,000 m) within the shale, to create maximum borehole surface area in contact with the Shale.
Shales that host economic quantities of gas have a number of common properties. They are rich in organic material (0.5% to 25%) and are usually mature petroleum source rocks in the thermogenic gas window, where high heat and pressure have converted petroleum to natural gas. They are sufficiently brittle and rigid enough to maintain open fractures.
Some of the gas produced is held in natural fractures, some in pore spaces, and some is adsorbed onto the organic material. The gas in the fractures is produced immediately; the gas adsorbed onto organic material is released as the formation pressure is drawn down by the well.
Shale Gas in India
Prospects

Shale Gas have often been quoted as Game Changer for United States of America and largely due to shale gas discoveries, estimated reserves of natural gas in the United States in 2008 were 35% higher than in 2006. Also figure shows the proportion of shale gas from the overall natural gas production.
India is estimated to hold 63 trillion cubic feet of recoverable shale gas. India has several Shale formations indicating the presence of Shale Oil/Gas. Preliminary estimates suggest that fairly thick sequences with high shale gas potential are extensively present in the oil, gas and coal sedimentary basins such as Cambay, Gondwana, Krisha-Godawari on land and Cauvery on-land. Directorate General of Hydrocarbons (DGH) has initiated steps to identify prospective area for Shale Gas exploration and acquisition of additional geo-scientific data. With new exploration technologies, such as multistage hydraulic fracturing or “fracking” combines with horizontal drilling, Production of shale gas has become easier and economic; contrary to the different countries has the potential to bring about drastic changes in composition of their energy basket.
A recent study (April 2011) by Energy Information Administration (EIA), USA indicates that there is a significant potential for Shale Gas that could play an increasingly important role in global natural gas markets. The Report assessed 48 Shale Gas basins in 32 countries. India is one of the countries covered in this Report along with Canada, Mexico, China, Australia Libya, Brazil etc. The initial estimate of technically recoverable shale gas resource in these countries (5,760 TCF2), and USA (862 TCF) put together works out to 6,622 TCF. This study has assessed risked gas-in-place of 290 TCF with technically recoverable resource of 63 TCF for 4 out of 26 sedimentary basins in India.
In a study conducted by the USGS in 2011-12, technically recoverable resource of 6.1 TCF has been estimated in 3 out of 26 sedimentary basins in India. The study also indicates potential for shale oil in Indian basins. Further, process of identification of potential shale oil/gas resources in 11 other basins has also been initiated.
Policy
Shale Gas exploration is expected to include high technicality. In such scenario the policy of keeping private companies out of shale gas exploration will pose altogether new set of challenges in the times to come. It expected that the two government owned firms, ONGC and Oil India Limited, will only be first allowed to explore shale gas in the reserves on acreage already awarded to them under NELP – 1999. NOCs are to apply for grant of shale gas and oil rights in their respective exploration and mining lease acreages are required to undertake a mandatory minimum work programme, said the statement released by cabinet committee. Companies are permitted three assessment phases of a maximum period of three years each. Royalty, cess and taxes would be payable at par with conventional oil and gas being produced from the respective areas, says the statement.
In the next phase, the government will allow state owned companies and industry to explore shale gas. Such disparity may not be well perceived by the industry which expects a level playing field and also a pre-cursor to replicate the success that the USA has achieved in Shale Gas exploration. Industry friendly regulations, a favourable price regime, a developed onshore services (OFS) sector, an extensive gas distribution network and market driven gas prices are needed to make shale gas a success in India. This view can be re-inforced with fact that Reliance Industries Limited are already engaged in Shale Gas exploration in the United States with huge investments.
Challenges
Amid the hype that Shale Gas is creating, it remains interesting to magnify and notice the other side of game-changes Shale Gas.
One of the key determinants of the viability of this technology is the availability of large quantities of clean water. This policy brief raises a red flag on this complementary input for exploiting shale gas resources in India, given that India is a water stressed country, and is fast approaching water scarcity conditions.
The shale gas exploration involves few critical challenges which cannot be ignored by a country that embarks on journey of recovering shale gas.
Firstly it is very drilling intensive activity. For example, if a country needs to delineate conventional oil or gas reservoir, it may need to drill 12 well but vis-a-vis for similar size unconventional hydrocarbon recovery, it will have to drill not less than 700 wells.
Secondly, as a consequence of it, we need huge contiguous land to undertake such mammoth drilling operations and hence embarking on shale gas exploration journey would prove futile if you have access to only small patches of land. Hence in India, with minimal land ownership, oil and gas ministry and Government of India might have to negotiate with large number of farmers. But in US such problems doesn’t arise because landlords have thousands of acres under their control.
Thirdly, there is no as such stark conclusive evidence that Shale Gas exploration has resulted in an environmental damage but there are serious concerns that the combination of water, chemicals and salt could result in ground water pollution leading eventually to surface water pollution.
Fourth challenge that is confronted by India’s Shale gas exploration industry will be produce it economically. In USA, with state of art upstream service support in place, the cost of exploring and producing shale gas is three times the exploration and production of conventional oil and gas. But in India, with service industry of upstream being in nascent stage, we’ll find it difficult to recover our shale gas economically unless we provide incentives, both operational and financial.
Fifth concern that endangers India’s shale gas exploration aspirations are the environmental concerns in using water for fracking (see Figure below) have been considerably downplayed and their significance underestimated. Further, enforcing legislation on environmental and water issues is a problem in India, and such legislation has been more in breach than in observance.
The policy has identified some of the water issues in the exploitation of shale gas and these are reproduced verbatim hereunder:

- Optimal exploitation of shale gas/oil requires Horizontal and Multilateral wells and multistage Hydraulic fracturing treatments of stimulate oil and gas production from shale.
This may require large volume of water ~3-4 million gallons per well (11,000 to 15,000 cubic metres of water required for drilling/hydro fracturing depending upon the well type and Shale characteristics).
- The water after Hydraulic fracturing is flowed back to the surface and may have high content of Total Dissolved Solids (TDS) and other contaminants (typically contains proppant (sand), chemical residue occur in many geologic formation, mainly in shale). Therefore, the treatment of this water before discharge to surface/subsurface water needs to be in line with the Central/State Ground Water Authority regulations.
- Possibility of contamination of Aquifier (both surface and subsurface) from hydro-fracturing and fracturing fluid disposal and the need for safeguarding the Aquifer. Multiple casing programmes (at least 2 casings) will be a mandatory requirement across all sub-surface fresh water aquifers.
Hence, while the potential shale gas reserves overshadow those of conventional gas, we have a long way to go in identifying shale gas rich basins and acquiring the necessary technology and experience to extract shale gas. Meanwhile, the water situation will only get worse due to the reducing availability of fresh drinking water year by year, dropping groundwater levels, and the increasingly polluted rivers and other water bodies. Unless, there is some revolutionary technological breakthrough, which does not need the use of fresh water and chemicals, it is vital that we seriously ask ourselves this question: Should we further endanger a rapidly depleting resource on which all life depends? The answer should be a resounding “NO”.
Meeting India’s Energy demands
Following are quick focus points which India’s Oil ministry should target in years to come.
ü Removing the bottlenecks in CBM exploration and production while safeguarding the environment:
ü Establishing a national research and development (R&D) Centre for gas hydrates, as requested by DGH Hydrocarbons:
ü Expanding our exploration of conventional gas through investor friendly policies by reducing their risks and allowing market driven prices
ü Acquiring gas equity abroad:
ü Continuing to import LNG from the Middle East and expanding our sourcing to the US, Australia, etc.
ü Giving a big push to renewable energy
ü Last, but not the least, taking urgent steps to protect, augment, and conserve our water resources for other critical uses.
Source: http://theindianeconomist.com/