Jacob (1940): Because of the low permeability of clays (or shales), there is a time lag between the lowering of pressure within the reservoirs and the appearance of that part of the oil, which is derived from storage in those clays (or shales).
Probably, the major component with reference to fluid expansion and reservoir compaction. Is it true??
Yes, it looks quite logical (assuming that the adjacent or interbedded claystone/shale is organic rich, mature for oil, oil saturated, still capable of further compaction, and not totally spent/overmature).
It is however hard to tell precisely, without hard data (modelling and experimental verification). It seems to be an interesting area for research.
Generally, it is. However, the strong compaction may cause a decrease in reservoir permeability, subsidence and in some case fracture closure. These problems can affect oil extraction.
Thanks for sharing your views.
Yes. Geo-mechanical (status of stress distribution) properties tend to have a close correlation with the water/hydro-carbon production.
In particular, the above aspects can relatively be better understood in (abnormally) high-pressured reservoirs.
However, how about the sensitivity of the above geo-mechanical aspects (such as fracture closure or land subsidence) in a normally-pressured petroleum reservoir?
Thanks again for your time and reply.
Suresh Kumar.
http://www.doe.iitm.ac.in/gskumar/
Dr Kumar i agree with this and i also have a strong propensity to work on that approach, which join geomechanical and petroleum geosciences, in fieds of reservoir engineering, drilling or hydrocarbon production... If you have a project on it please i will be greatfull to work with you