时变地震资料压力异常分析在综合地质研究中的应用

Application of analyzing pressure anomaly in time-varying seismic data in comprehensive geologic study

本文利用地震资料基于衍生Fillippone算法估算地层压力系数,发现压力异常带。其关键在于通过井约束反演获得高分辨率的波阻抗体,从中求取真实地层速度Vi;再由声波测井的时差曲线,采用多项式趋势分析,获取正常压实趋势速度VN及最大速度Vmax。由于此法的假设条件难以严格地满足,据此得到的分析压力预测参数只能作为其他分析手段的补充。此法在KHD油田的应用中与钻井的实钻结果较一致,说明此法也是一种有益的研究手段。

On the basis of derivative Fillippone algorithm,using seismic data,the paper evaluates the formation pressure coefficients and discovers the pressure-anomalous zone. The key lies in acquiring high-resolution wave impedance volume by logging-constrained inversion and further computing true formation velocity V_i; then, the normal compaction trend interval velocity V_N and max velocity V_ max can be acquired by using polynomial trend analysis for interval transient time of acoustic log. Because the hypothetic condition of the approach is difficult to be strictly met, the acquired predicted analytic pressure parameters only act as complement of other analytic means. The results from application of the method in KHD oilfield are relatively coincident with real drilling results, which showed that the method is a useful studying tool.