Petroleum Reservoir System
1. Do we now have a lucidity on, whether, how exactly, hydrocarbons keep moving out of source rock (in solution; in colloidal suspension; or, as proto-petroleum; or, as discreet globules of oil; or, by diffusion)?
Whether the movement and direction (upward/downward/lateral) of ‘primary migration’ remains critically influenced by relative positioning of source and reservoir rocks?
2. Whether ‘secondary migration’ would remain insignificant - in the absence of - buoyancy of oil and gas?
3. Although migration could be a very slow process with reference to geological time scales; and; despite the fact that - oil and gas reserves - that are currently being depleted - could never be replaced - by any other natural processes, whether the ‘generation’ of hydrocarbons - and it’s subsequent ‘accumulation’ in traps (elsewhere) - is still - a continuous process?
4. How frequently do we encounter a hydrocarbon reservoir with high-end porosity values like 35 – 40%, although, the most common value of reservoir porosity ranges between 5 and 10 percent?
5. While high-permeability value could mostly be correlated positively with high-porosity values, why is that the high-porosity zones are not necessarily characterized by high-permeability values, particularly, in carbonate reservoirs?
If so, what is the physical significance behind - having a large variation between ‘absolute permeability’ and ‘effective permeability’ in carbonate reservoirs?
Feasible to correlate the reasoning with ‘diagenetic fractures’ and ‘tectonic fractures’?
6. Since, ‘closure’ (the vital feature of an anticlinal trap that refers to the vertical distance between the crest of the structure and spill point) controls the height of the hydrocarbon column; and subsequently, the ‘storage capacity’ of the structure, can we correlate ‘closure’ with reservoir ‘porosity’?
7. Feasible to have a direct correlation between ‘spill point’ (the lowest level @ which hydrocarbons can be retained in the trap; and upon filling the trap to its spill point, it’s hydrocarbon storage capacity ends) and ‘fluid contacts’ (OWC/GOC)?
Do spill points provide any clue on tilted fluid contacts – as a function of ‘direction of water flow’ and the ‘degree of up/down dip displacement of hydrocarbons’?
8. How frequently do we encounter reservoirs – with laterally not extensive seals?
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