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Dynamic-to-static modeling
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DOI：10.1190/geo2020-0778.1.png)
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Abstract
En 中文
Dynamic-to-static (DTS) modulus conversion has long been recognized as a complicated and challenging task in reservoir characterization and seismic geomechanics, and many single- and two-variable regression equations have been proposed. In practice, however, the form and constants of the regression equation are variable from case to case. I have introduced a methodology for estimating the static moduli called DTS modeling. The methodology is validated by laboratory tests (ultrasonic and triaxial compression tests) to obtain dynamic and quasistatic bulk and Young's (elasticity) moduli. Then, rock deformation phenomena are simulated considering different parameters affecting the process. The dynamic behavior is further modeled using rock physics methods. Unlike conventional DTS conversion procedures, this method considers a wide range of factor affecting the relationship between dynamic and static moduli, including strain amplitude, dispersion, rock failure mechanism, pore shape, crack parameters, poromechanics, and upscaling. A comparison of data from laboratory and in situ tests and estimation results indicates promising findings. The accuracy of the results is assessed by analysis of valiance. In addition to modeling static moduli, DTS can be used to verify static and dynamic moduli values with appropriate accuracy when core data are not available.
Keywords:
ELASTIC-MODULUS
ATTENUATION
DISPERSION
CRACKS
ROCKS