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针对大牛地气田含气层段多、砂体非均质性强、横向变化快、波阻抗差异不突出的问题,在地层格架划分的基础上,结合生产井的生产信息,对储层进行波形差异分析,结果表明,不同类产层所对应的井旁道质心、均值、方差、变方差的中心、概率及特征值有一定差异,但敏感度不够。为得到含气性敏感度更高的地震波形参数,对地震波形敏感信息进行分析与重构,构建出7个新的波形差异参数,建立不同产能储层与地震波形的对应关系;在此基础上,反演出目的产层的波形差异数据体;结合沉积相等地质信息对波形差异数据体进行综合解释,得到目的产层的高产气区的预测图;利用生产井及新投产井对预测结果进行分析,总预测符合率达86%。
In view of the problems of gas-bearing interval in Daniudi gas field, strong heterogeneity of sand body, rapid horizontal variation and inconspicuous difference in wave impedance, based on the division of the stratigraphic framework and the production information of production wells, The result of waveform difference analysis shows that there are some differences in the centers, probabilities and eigenvalues of centroid, mean value, variance and variogram of the corresponding wells in different classes of production, but the sensitivity is not enough. In order to obtain the seismic data with higher gas sensitivity, the seismic waveform sensitive information is analyzed and reconstructed, and seven new waveform difference parameters are constructed to establish the corresponding relationship between different productivity reservoirs and seismic waveforms. Based on this, , The data of the waveform difference of the target formation is inversed. Combined with the geological data of sedimentary equivalent, a comprehensive interpretation of the data of the waveform difference is performed to obtain the prediction map of the high production area of the target formation. The production results of the production well and the new production well Analysis, the total prediction rate of 86%.