多目标储层地震分时频处理技术

Multi-time and frequency gate seismic data processing and its application in the multi-target Mesozoic reservoir

鄂尔多斯盆地西南部的西峰地区存在两大套生储油目标层系,其原始地震资料的有效反射较弱,反射位置相近(小于300 ms),但能量、频率成份、波形、相位及噪声特征等均存在差异。采用多目标储层分时频处理技术,即首先分析各主要目标层段有效信号波组特征、频率成份及噪声特征;然后分时求取反褶积因子,分时频作速度分析,分时频采用不同的动、静校正,分时去噪,做分时振幅、频率补偿;最后将分时分频处理的成果合成后再作相应的叠后处理,可获得高分辨率、高信噪比剖面,能够满足后续各目标储层的地震反演及储层预测的需要。

There are two oil-bearing strata at Xifeng area in southwest Ordos Basia The reflections from the strara were weak and close in space (less than 300ms). However differences exist in energy, frequency content, waveform, phase, and noise characteristics between the reflections. Reservoir-oriented multi-time and frequency gate processing technique was adopted. Firstly analyze the characteristics of reflections and noises and determine their frequency contents. Secondly calculate deconvolution coefficient using multi-time gates, analyze velocity using multi-time and frequency gates, and implement noise removal, amplitude and frequency compensation, as well as static correction and DMO within multi-time and frequency gates. And finally combine the results and carry out post-stack processing.