Due to the variation of geologic environment reservoir is often invaded by external water, thus, resulting in the property difference between connate water and formation water.
It has been proved by experiments that there's stress sensitivity in some low-permeability gas condensate reservoirs, and higher the connate water saturation, stronger the stress sensitivity.
In contrast, connate water is the water trapped in the pores of a rock during its formation, and may be called fossil water.
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