Petrologic composition model of the upper crust in Bohai Bay basin, China, based on Lamé impedances

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Abstract Seismic attributes, such as P- and S-wave velocity, Poisson’s ratio, and acoustic impedances, all generally can be used for distinguishing different rock types. The non-uniqueness can be largely reduced using Lamé impedances instead of acoustic impedances as additional constraints. We have followed this method to constitute a petrologic composition model of the upper crust in the Bohai Bay basin, China. We briefly review the seismic parameters used for discrimination of rock types and focus our attention on the sensitivity of different combinations of parameters to determine the composition of materials. Corrections for pressure and temperature are performed in order to compare elastic wave velocities and densities measured at room temperature and surface pressure in laboratory with those for representative rock parameters. In a second step, we find the rock classes in the tested area by contrasting known data to laboratory measurements on a variety of rock samples extracted in the area. The basic field data are P-wave velocity values collected along a seismic profile conducted in the Bozhong Depression. The different rock types belonging to a particular rock class are finally constrained by the seismic velocities, Poisson’s ratio, density, acoustic impedance, and Lamé impedance related to the topmost 10 km of the Bohai Bay crust.

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	ZHANG Xi
	Louisa L. H. Tsang
	WANG Yang-Hua
	ZHAO Bing

Key words： seismic velocity Poisson’s ratio acoustic and Lamé impedances Bohai Bay

Received: 2009-10-29;

Fund:

This research was partially supported by the National Natural Science Foundation of China (Grant 20930140), the Chinese Academy of Sciences and the sponsors of the Centre for Reservoir Geophysics of the Imperial College.

Cite this article:

ZHANG Xi,Louisa L. H. Tsang,WANG Yang-Hua et al. Petrologic composition model of the upper crust in Bohai Bay basin, China, based on Lamé impedances[J]. APPLIED GEOPHYSICS, 2009, 6(4): 327-336.

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