Detection of reserviors from normalized full gradient of gravity anomalies and its application to Shengli oil field, east China

摘要

We present how to detect reservoirs by the 3-D nor- malized full gradient(NFG)of gravity anomalies con- strained by seismic and drilling data. The normalized full gradient represents the full gradient of the gravity anomaly at a point divided by the average of the full gradient at the datum. The closed minima on an NFG map indicate the occurrence and horizontal locations of the centers of mass of density anomalies related to oil reservoirs. This in formation can be used to select well locations in an oil field. On a cross-section, the closed minima can be used to estimate the depth to centers of mass of possible hydrocarbon reservoirs.