What does s.g. mean as a stress unit in oil and gas papers?

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Hi all,

I am currently trying to understand a paper which presents a model for sand production and wellbore collapse in the oil&gas industry.

The paper refers to stresses and pressure in "s.g." instead of Pa or other pressure/stress units... values tend to range from 0.4 s.g. for cohesive rock strength to 1.88 s.g. overburden stress at 1.2km depth.

Anybody knows what those units are ? I seem to get correct values when inputting my own data in Pa. But I wanted to make sure I wasn't missing out a conversion factor.

Thank you
 
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