ZD地区复杂构造成像针对性处理技术

ZD地区地表地震条件复杂,地下断层发育,构造较复杂,目的层地震反射信号弱,资料信噪比和分辨率低,常规的地震成像方法难以满足勘探开发的需要。为了改善该地区东部丘陵地带中深层反射的信噪比和分辨率,对静校正、叠前多域去噪、地表一致性处理、高精度偏移速度场建模与叠前时间偏移等技术手段进行了研究。通过多种静校正方法的试验与应用,解决了静校正问题;采用多域去噪技术进行叠前多域去噪,压制各种干扰,突出有效反射;利用地表一致性处理技术消除各种非一致性因素的影响;通过高精度偏移速度场建模与叠前时间偏移技术提高偏移成像效果。最终时间偏移剖面上的波组特征清楚,中深层信噪比有较大提高,连续性增强,断点、断面清晰可靠,成像精度比老剖面有明显提高。通过综合解释,对该区构造取得了新的认识,发现了一批新圈闭,经钻探见到了良好的油气显示。

Seismic data processing techniques aiming at the imaging of complex structures in ZD area

The surface seismic condition of ZD area is complicated,and mature faults and complicated structures is developed,which causes weak seismic reflection signal on target interval,low signal-to-noise ratio and resolution.The conventional seismic imaging methods are difficult to meet the needs of the exploration and development.In order to improve the signal-to-noise ratio and the resolution of the middle-deep layer reflections of the hilly region in the east of the ZD area,some seismic data processing techniques were applied and analyzed,including static correction,prestack multi-domain denoising,surface consistent processing,high-precision migration velocity field modeling and prestack time migration.On the time migration profile achieved from the above techniques,the characteristics of wave group is clear,the signal-to-noise ratio of middle-deep layer reflections was largely increased;meanwhile,the continuity of the events were strengthened,the breakpoints and fault sections are clear and reliable.Through comprehensive interpretation,we achieved a new understanding of the structures in ZD area,discovered several new traps with good oil-gas show after drilling.