Although these have high TOC, abundance of type I, II, and III organic matter, and desired maturity, these are not actually 'home' for hydrocarbons. Why? Shouldn't Indian researchers think about inspecting their CO2 storage capabilities?
Dear Bodhisatwa,
assuming that you use the word 'reserves' intentionally and do not mean 'reservoirs' or 'resources' the answer is simple. The term 'reserves' is only to be used if the hydrocarbons contained in those rocks can be produced profitably under currently prevailing technical and economic conditions and if there is an approved development plan in place.
If those conditions are not met the term 'resources' is applicable.
Regards,
Evert van de Graaff
Desired maturity and TOC are just one of the aspects from geochemical point of view. Present TOC only imply a organically rich source rock at present. Firstly, What is important is the ammount of organic matter converted and how (kerogen kinetics). Integrating the data from original TOC, Maturity and simulated kerogen kinetics from pyrolysis data (not with standard one in the public domain) in the simple 1D basin modeling for burial history and maturation history can explain why Indian Permian shales are not a home for oil and gas from generation perspective. Secondly, reservoir quality (porosity , permeability, saturation, adsorption characteristics...Etc) and completion quality (fracabiluty) needs to be looked before calling a source cum reservoir rock a home for shale oil or gas, if generation part is supporting. Like Mr. Graaff said, it is just resource kept in vault untill an economic viability is not justified. In Case, basinal level study is not done to claim impotency of Indian Permian shale. Untill it is fracked to produced (if any), co2 storage will be a pipeline dream and not less than research fantasy.
Regards
Sumit Kumar.
Thanks for giving an elaborate answer. I agree to most of your points. Your first point does make sense, however, saying that, it's important to understand that to call a rock a good source rock- you don't need to understand it's petrophysical nature. That comes second, and probably that's why you mention it as your second point. My point was simple: say the Barren Measures shales- these have abundance of type I and ii om, but s1 is low- does this mean that the hcs have been expelled? If so when, how, and where?
Taking about CO2 sequestration, yeah it's more of a research fancy for us Indians, more because of our vision, rather than the potential itself. For example, not a single well has been done to inject CO2- I understand that a lot of economics' is there to be considered, before actually something happens.
@Dr. Hazra
What, when and where can only be answered with detail 3D Basin modelling. For that collected data is insufficient at present due to limited wells have drilled in Barren Measures shale formation to check its potentially. Hope in future it could be proactive one.
We have insufficient data regarding our shale gas basins particularly Permian shale formations in our country. Based upon the recent published work the Permian shales in Damodar Basin have yielded appreciable resource potential. However to categorise any shale gas basin into a producing or non-producing basin we have to understand the geomechanics of the shales as well. What I have learned in this aespect of the Barren Measure shales is that they behave as brittle even under the confining pressures of 3000 psi. So why not frac them? So before turning these shales into a tank lets get the gas out. Kindly see the link below...
https://www.essar.com/essar-oil-gas-exploration-and-production-gets-green-nod-to-commence-shale-gas-exploration/
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