Comparison of Centered and Traditional Offset Vector Tiling for a Wide Azimuthal Land 3D Survey

Abstract

Summary We present a centered offset vector tile (OVT) scheme and illustrate its benefits for wide azimuth (WAZ) land 3D seismic surveys. The OVT method is used to produce the single fold prestack data volumes that cover the full 3D survey area. All traces in a single OVT volume share similar offset and azimuth attributes. They also provide new opportunities for nD noise attenuation, nD interpolation, and nD imaging that lead to higher signal to noise ratio and better subsurface image. Traditionally, the first four tiles are built around the intersection of a cross-spread so the nearest offsets are distributed equally to these four tiles, and then the other tiles are generated around them and spread out from near to far offsets. Our centered tiling method centers the first tile at the intersection of a cross-spread and then the remaining tiles are spread out around it from near to far offsets. Centered tiling approach ensures a minimum offset OVT at the center of a cross-spread acquisition and images the shallow section better. A WAZ land 3D dataset is tested to demonstrate the difference and advantage of the centered OVT method.