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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
The Significance of the Expulsion of Water in Oil-Phase Primary Migration
ABSTRACT
The effective expulsion of water is essential to keep a relatively high saturation of generated oil in the liquid-water phase in shales. If the oil saturation in the remaining liquid-water phase becomes as high as 1 to 10 per cent after effective drainage, the oil may flow with the water in the shales toward the sands. This flow rate is considered to be extremely slow because of the low permeability of the shales; however, over periods of geological time, this slow movement of oil may suffice to accumulate a large amount of oil in a given structure.
If the drainage is not effective, most of the liquid water may have to stay in the shale pore spaces, reducing the oil saturation. Under these conditions, if some late-stage compaction takes place, water can move out but oil in a separate phase can not, because the saturation is so low.
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