ZGY is a file format used for storing 3D seismic trace data. ZGY is the standard format used for seismic interpretation workflows in Schlumberger’s Petrel E&P software platform. Data is commonly converted to ZGY from SEG-Y format. ZGY utilizes bricking to store multiple resolutions of a data set based on an octree data structure. A brick typically consists of 64x64x64 samples, though brick sizes can vary. The ZGY format also supports compression of data.
OpenZGY is an open source library of the ZGY file format for 3D seismic post stack data.