Application of an integrated wave-equation datuming scheme to overthrust data: A case history from the Chinese foothills

Autor:	Fan Jiang, Hong-Ming Zheng, Li Wang, Kai Yang, Jiubing Cheng, Yuzhu Liu, Zaitian Ma
Rok vydání:	2009
Předmět:	Diffraction Tectonics Geophysics Geochemistry and Petrology Signal reconstruction Upward continuation Geodetic datum Wave equation Integral equation Seismology Geology Synthetic data
Zdroj:	GEOPHYSICS. 74:B153-B165
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.3174393
Popis:	An integrated wave-equation datuming scheme improves the imaging quality of seismic data from overthrust areas. It can be regarded as integrated because upward-layer replacement is included. In this scheme, data are downward continued to a nonplanar datum (such as the base of the weathering layer), followed by upward continuation from the nonplanar datum to a final planar datum using a one-way extrapolator. When compared with a Kirchhoff integral, this method can deal better with the strong lateral velocity variation within the near surface. After a test on synthetic data, the scheme is applied successfully to real 2D overthrust data acquired in the Qi-Lian foothills, western China. Compared with results using static corrections, integrated wave-equation datuming results lead to better reconstruction of the diffractions and reflections, more reliable migration-velocity analyses, and stronger stack and final depth images.
Databáze:	OpenAIRE
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