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松辽盆地德惠断陷火山岩发育,构造复杂,成像困难。常规偏移的成果存在着火山岩反射特征不清,基底形态不清等问题,需要对叠前深度偏移进行研究,改善深层成像效果,进一步提高火山岩的预测精度。本文根据德惠断陷的实际情况对深度偏移的关键环节如叠前道集准备、速度建模等问题进行了研究,取得了较好的应用效果。
The volcanic rocks in the Dehui fault depression in Songliao Basin develop with complicated structures and difficult imaging. The results of conventional migration have some problems such as unclear reflection characteristics of volcanic rocks and unclear basement morphology. Therefore, it is necessary to study the pre-stack depth migration to improve the deep imaging effect and further improve the prediction accuracy of volcanic rocks. Based on the actual situation of Dehui fault depression, this paper studies the key aspects of depth migration, such as preparation of prestack gathers, velocity modeling and so on, and obtains good application results.