地震切片技术在安达工区的应用

Application of slicing technology in Anda area

地震切片包括水平切片、沿层切片和地层切片,是目前全三维地震综合解释的常用手段。本文从实际资料应用的角度,分别论述了三种类型地震切片的地球物理涵义、地质意义、使用特点和适用条件,在细分层、高精度等时对比层序地层格架下,利用关键井测井曲线等资料约束,应用沿层切片与地层切片技术,识别并刻画了大庆滨北安达工区上白垩统嫩江组一段两期次的水下分流河道平面展布形态及规模,取得了较好的地质效果。同时也认识到:由于地层切片是两个相邻界面间根据厚度按等比例关系内插出的一系列界面,在垂向上展布的地层形态基本上与子波反映的形态一致,因此地层切片超越了层拉平的概念,具有明确的物理意义;地震切片作为单一技术需要加强适用条件的分析,并且要与其他的地质、地球物理技术配套使用。

Seismic slicing includes horizontal slicing,slicing along layer and stratal slicing,they are conventional means in full 3d integrated interpretation.In this paper from the perspective of practical application of the seismic slicing,the geophysical meaning,geological meaning,and applicable characteristics and conditions of the three slicing methods were respectively discussed,in the Level-Of-Detail (LOD) and highly precise isochronous correlation sequence stratigraphic framework and constrained by well logging curves of key wells,the slicing along layer technique and stratal slicing technique were utilized to delineate planar distribution form and scale of the two-period underwater distributary channel for Upper Cretaceous 1st member of Nenjiang Formation in Anda Area of Binbei,Daqing,and the achieved results were encouraging.It was understood at the same time that the stratal slice is actually a series of interfaces which were interpolated from two adjacent interfaces based on the thickness and the scale,and the stratal slice's vertical formation shape is basically consistent with the shape which the wavelet reflects,therefore stratal slice surpasses the concept of layer flattening,and it has explicit physical meaning,when using the seismic slicing which is single technique,we need to pay attention to analysis of the applicable conditions,and combine its application with other techniques,such as geological technique and geophysical technique.