地震分频压力反演技术在莺歌海盆地DFx气田中的应用

Application of The seismic Dividing Frequency Pressure Inversion Technique in DFx Gas Field in Yinggehai Basin

鉴于以往钻前压力预测技术不能得到地层压力在空间上的变化特征,本次研究将叠后地震资料与分频反演思想引入钻前压力预测工作中,依靠井点压力系数曲线与地震资料建立非线性关系,合理利用地震数据中的低、中、高频数据,进行分频地层压力系数反演。通过对比检验井钻后压力系数曲线与钻前压力系数反演剖面,两者具有很高的吻合度,证实利用分频反演技术来进行钻前压力预测是可行的。该方法方便简单,具有较强的实用性,为钻前地层压力的预测提供了新的途径。

Since the spatial variation of formation pressure cannot be predicted by traditional pressure predication method before drilling.Poststack seismic data and the idea of dividing frequency inversion were introduced to pressure prediction before drilling work in this study,nonlinear relationship was established relying on borehole pressure coefficient curve and seismic data,dividing frequency formation pressure coefficient inversion was performed by rational use of the low,medium and high frequency data of seismic data.The dividing frequency inversion technique was confirmed to be feasible in pre-drill pressure prediction by comparing the pressure coefficient curve after drilling and pressure coefficient inversion profile before drilling of test wells.New avenues was opened up by dividing frequency inversion technique for formation pressure prediction before drilling because this method is convenient,simple and with a strong practical.