【摘要】 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。更多还原

【Abstract】 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.更多还原