Solution of the deconvolution problem in the general statement

V. V. Vasin   ; G. G. Skorik

Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 22 (2016) no. 2, pp. 79-90

Résumé

The deconvolution problem, which arises in the description of well testing processes, is formulated in the form of a Volterra equation of the first kind with discontinuous input data (the kernel is the flow rate and the right-hand side is the pressure change) characterized by large measurement errors. In addition, the solution of this equation has multiscale behavior in its domain. In this situation, the traditional solution algorithms for Volterra equations, as a rule, do not provide satisfactory results. To solve the problem, we use the variational regularization methods and construct a function basis (a system of exponents), which allow us to take into account in the algorithms all a priori constraints known for the desired solution. As a result, we form a family of approximate solutions that satisfies the conditions of smoothness end exactness required for the interpretation of well tests. For the constructed regularizing algorithms, we formulate convergence theorems and describe the details of numerical implementation.

Détail

Mots-clés : deconvolution problem
Keywords: well test, Tikhonov regularization, method of quasisolutions, system of exponents, a priori constraints.

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