Seismic traveltime tomography applied to data from miranga field, Recôncavo basin, Brazil

Abstract

The growing global demand for hydrocarbons has tested the limits of oil exploration and exploitation technologies. Among the seismic methods, tomography is an alternative means for high-resolution characterization of reservoirs, and it enables a more efficient recovery of both new and mature fields. In this work we apply the traveltime inversion to cross well data from Miranga Field, in the Recôncavo Basin, State of Bahia. The objective is to estimate the two-dimensional velocity distribution in the region between the wells. We use linearized inversion through the Levenberg-Marquardt scheme. The linear system during the iteration is solved by the Conjugate Gradient method. Because the inverse problem is ill-posed we apply regularization by derivative matrices of first and second orders, and the optimal regularization parameter is chosen using the L-curve and the Θ-curve.