An illustration of adaptive Marchenko imaging

An illustration of adaptive Marchenko imaging

Van der Neut, J.R.
Wapenaar, C.P.A.
Thorbecke, J.W.
Slob, E.C.
Vasconcelos, I.

Civil Engineering and Geosciences

Geoscience & Engineering

2015-07-01

In Marchenko imaging, wavefields are retrieved at specified focal points in the subsurface through an iterative scheme derived from the multidimensional Marchenko equation. The method requires seismic-reflection data at the earth’s surface (after free-surface multiple elimination) and an estimate of the direct wavefield from the surface to each focal point, which can be computed, for instance, in a macrovelocity model. In the first iteration, the direct wavefield is crosscorrelated with the reflection data. This operation is identical to inverse-wavefield extrapolation as is applied commonly in various imaging schemes, for instance, in reverse time migration (RTM). At each succeeding iteration, the result of the previous iteration is truncated in time and crosscorrelated with the reflection data again. To obtain a seismic image, a multidimensional deconvolution-based imaging condition can be applied to the retrieved wavefields. By this approach, both primary reflections and internal multiples contribute to the construction of the image. Alternatively, a crosscorrelation-based imaging condition can be used in which only the primary reflections are imaged and the contributions of internal multiples are subtracted. The latter strategy offers more flexibility because the subtraction of redatumed internal multiples can be implemented adaptively. Through this approach, the artifacts from internal multiples can be removed effectively from a conventional RTM image.

http://resolver.tudelft.nl/uuid:835a8461-b853-46e4-9a70-7d8e19a95485

Society of Exploration Geophysicists

1070-485X

https://doi.org/10.1190/tle34070818.1

The Leading Edge, 34 (7), 2015

Institutional Repository

journal article

(c) 2015 The Author(s)