Why calculated gravity anomaly of oil and gas deposits is always less than the observed anomalies over deposits?

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Zhiguo An

Your calculated gravity data is just a fitness with all the observed data, as Mykhailo said, the anomaly is combined with actual geological information, like water reservoir.

Pankaj Kumar

since reservoir contains oil, gas and water therefore lateral density distribution is less and shows less gravity anomaly.

Anirbid Sircar

Observed gravity data is devoid of corrections. The calculated gravity data is subjected to corrections such as Free Air Corrections, Bouguer corrections, latitude corrections, Elevation corrections etc.