地震正演模型应用(Ⅰ):用叠后地震正演模拟方法精确解释东河砂岩尖灭点(英文)

Applied seismic forward modeling(part Ⅰ): Accurate interpretation of the Donghe sandstone pinchout by post-stack seismic forward modeling

叠后正演模拟不仅能更好地解释平缓构造背景下的地震数据,而且有助于描述地震资料无法分辨的地质体。东河砂岩是塔里木盆地已知的储集层,横向展布不均匀,由于地震分辨率的限制,很难准确描述东河砂岩的空间展布。用叠后地震正演模拟方法研究东河砂岩尖灭点分布,发现合成地震振幅能量首先增强,然后衰减,其中还存在地层上拉和假倾角现象。这些特征有助于对东河砂岩尖灭点进行地震解释。

Post-stack seismic forward modeling can be used to better interpret seismic data in gently dipping geologies and characterize geological body of even sub-seismic resolution by revealing the characteristic seismic responeses. The Donghe sandstone of the Tarim Basin is a known oil reservoir with widespread but irregular lateral distribution. Because of the limit of the seismic resolution, it is difficult to delineate the spatial distribution of the sandstone. Post-stack seismic forward modeling on the Donghe sandstone pinchout distribution shows characteristic responses on synthetic seismic data of first amplitude enhancement and then decay, and false dip and pushup of overlying reflections. These indicators form an interpretation tool for locating the Donghe sandstone pinchout on seismic.