Application of Numerical Grid Tomographic Velocity in Imaging of Complex Salt Gypsum

Velocity analysis is always one of key steps in seismic data processing. The paper firstly analyzes the seismic reflection features of salt gypsum rocks in the research region and finely depicts and interprets salt gypsum horizons in response to the difficult problem on imaging of “three-gypsum two-salt” formations with strong deformation in the Amu Darya Area. Secondly, the paper optimizes the overall background velocity in the three intervals such as overlying salt gypsum formation, salt gypsum rock formation and underlying salt gypsum rock formation. Finally, the paper subdivides different sizes of horizon control grids of salt gypsum rock intervals for tomographic iteration velocity optimization. This plays a good role in correction of imaging amplitude distortion caused by salt gypsum rocks with complex deformation features and has established a set of theories and processes suitable for imaging of complex salt gypsum rocks in the Amu Darya Area.