Abstract
In future years, cracked reservoirs will be an important target for oil and gas exploration. Cracks play an essential role in the evaluation and prediction of cracked reservoirs. The amplitude variation with azimuth (AVA) method of studying crack properties is becoming an important means of evaluating cracks and now the P-wave AVA method can be used in the inversion of crack density. In order to improve the precision of inversion, we constructed a convex objective function on the basis of the combination of P- and converted-wave data. We then used conjugate gradient methods for the inversion of crack density. Numerical calculations in both fluid-filled and dry crack models and stability analysis of this method proved its viability and stability.
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