The seismic distinguishing and prediction technique applied to gas reservoir in Jiyang depression

摘要

The gas concentrates in the shallow layer of the Jiyang depression, the rock physical properties changed before and after gas concentration, so we can detect and distinguish it by the seismic methods. We have obtained the seismic distinguishing and predicting techniques, such as bright spot in shallow gas layer, AVO, 3D visiulization interpretation, based on the petrophysical analysis, and by a particular processing; we have got some general indicators to distinguish the sandstone gas reservoir and the carbonate gas reservoir in middle layer by analyzing the seismic reflection properties in the middle gas concentration zone in Jiyang depression. We developed the 3D AVO processing and interpretation study for the gas reservoir in the middle layer and obtained good results in the actual application.