STUDY ON THE SEISMIC TECHNOLOGY IN THE PREDICATION OF NATURAL GAS RESERVOIR IN MIDDLE AND DEEP LAYER

The natural gas resource is rich in Jiyang despression, and different type gas reservoirs have been discovered in many strata.As the geological condition and seismic reflection are complex, different technique must be adopted to different reservoirs.The research in petrophysics, seismic inversion and seismic attributes shows that the physical feature of the reservoirs in middle layer is good, and can be identified with bright spot, AVO and pe-stack seismic inversion, espetially in belta sand region.Seismic attribute and multiattribute inversion is effective to the predication in deep gas reservoirs with low porosity and permeability.The distribution of reservoirs facies zone in Gubei area is predicted with the method.