Basis pursuit inversion for Young’s modulus and Poisson’s ratio
(2.China United Coalbed Methane Corporation Ltd., Beijing, China 100011)
(3.Unconventional Oil and Gas Branch, CNOOC, Beijing, China 100011)
(4.University of Chinese Academy of Sciences, Beijing, China 100049)
(5.Research Institute, CNOOC, Beijing, China 100028)
【Abstract】Based on the basis pursuit theory, this paper develops an approach to directly invert Young’s modulus and Poisson’s ratio with the prestack seismic data. First, based on the approximate equation of Zoeppritz equation and the relationship between elastic parameters, a linear approximate equation of the seismic reflection coefficient is derived, which contains Young’s modulus, Poisson’s ratio, and density. Thereafter, Young’s modulus and Poisson’s ratio are directly inverted with the prestack seismic data based on the basis pursuit. Model constraints are added to objective functions of the basis pursuit inversion to improve the stability. Both model tests and field data applications show that the proposed approach can stably estimate Young’s modulus and Poisson’s ratio from seismic data.
【Keywords】 Young’s modulus; Poisson’s ratio; prestack inversion; basis pursuit;
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