The shallow layer of Bozhong A oilfield develops a large number of "bright spot" gas-bearing reservoirs.The identification of these reservoirs is seriously affected by the water-bearing reservoirs with the tuning thickness.To solve this problem,the authors,based on the difference of the main control factors of the strong amplitude caused by the gas and water layers,analyzed and summarized the amplitude energy response law of the different thickness of the gas layer and the water layer with tuned thickness,and proposed the method for detecting the shallow "bright spot" type gas layer by using the frequency-dividing amplitude.The method was successfully applied to the prediction of gas-bearing reservoirs in Bozhong A oilfield,and guided the well-appraisal proposal efficiently.This method can be potentially applied to the other gas-bearing reservoirs prediction in Bohai and provide reliable technical supports for well deployment of oil and gas exploration.
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