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泌阳凹陷新庄地区构造破碎,小断块发育,储层埋藏浅(只有50～800 m),地震波纵、横向速度变化剧烈,常规的地震成像方法难以满足勘探开发的需要。针对这些特点,进行了叠前时间偏移和保护浅层反射信息的处理,包括叠前数据的基础处理,速度模型的建立和偏移参数的确定三个重要环节。通过叠前去噪、高精度静校正、远偏移距拉伸处理、分偏移距能量均衡等得到了高品质的叠前数据体;通过偏移、速度分析,再偏移、再速度分析多次迭代,确定了最佳偏移速度;根据目的层倾角分布情况,选择最佳偏移孔径和偏移倾角参数,提高了成像精度。最终时间偏移成果剖面上断层清楚、信息丰富。通过综合解释,对泌阳凹陷新庄地区断裂特征取得了新的认识,发现了一批新圈闭,经钻探见到了良好的油气显示。
In the Xinzhuang area of Biyang Depression, the structure is fragmented, the small fault blocks develop, the reservoir is buried shallow (only 50 ~ 800 m), and the vertical and horizontal velocity of seismic waves change drastically. Conventional seismic imaging methods can not meet the needs of exploration and development. According to these characteristics, prestack time migration and shallow reflectance information processing are carried out, including the basic processing of prestack data, the establishment of velocity model and the determination of offset parameters. High-quality prestack data bodies are obtained by prestack noise reduction, high-precision static correction, far-offset stretch processing and energy balance of sub-offset and so on. By means of offset, velocity analysis, re-migration and re-velocity analysis Multiple iterations determine the best migration speed. According to the dip distribution of the target layer, the optimal offset aperture and offset tilt parameters are selected to improve the imaging accuracy. The results of the final time offset section clear fault, informative. Through comprehensive interpretation, a new understanding of the fault characteristics of the Xinzhuang area in the Biyang depression has been obtained and a number of new traps have been discovered. Good oil and gas displays have been seen through drilling.