叠前深度偏移资料解释方法研究

Data interpretation on prestack depth-migration section

大庆油田有限责任公司勘探开发研究院,黑龙江大庆 163712

Exploration and Development Research Institute of Daqing Oilfield Company Limited, Daqing 163712, China

以内蒙古海拉尔地区复杂地震资料作为研究剖析实例,根据叠前深度偏移剖面的具体特点,通过建立新的合成地震记录模式和新的地震数据处理模式,探索出一套针对叠前深度偏移资料的解释方法,使深度剖面的岩性解释工作得到了补充。变频率初相位的合成地震记录方法合理有效地解决了模拟地震子波的相位问题,使层位的对比更加可靠;通过峰谷差值剖面的处理,提供了一种类似于经过反演处理的剖面,有效避免了振幅横向不均匀变化给岩性预测带来的影响,使得深度域的解释方法更加简便和合理;地震资料相干体技术的应用,为进一步提高储层构造分析精度提供了有利的工具。结合钻井资料,对海拉尔地区叠前深度偏移地震数据体进行了研究分析,最终确定了布井有利区,为进一步的井位部署提供了依据。

Taking the real seismic data from Hailaer, Inner Mongolia as example, this paper discussed a new way to construct synthetic seismogram and determine the workflow of data processing for prestack migration, and established a suite of interpretation methods for prestack migrated data. Synthetic seismogram constructed from frequency-variant initial phases is free from phase problem of analog seismic wavelet, making the correlation of horizon more reliable. Difference profile between peak and trough, a kind of profile similar to inverted ones, leads to more reasonable interpretation because it is unaffected by the nonuniform lateral changes of amplitude. Coherence cube is used to improve the description of reservoir structure. Combing existing drilling data with results from the a-nalysis on prestack migration data set with the above-mentioned methods, the author proposed favorable areas for future drilling in Hailaer survey area.