Downhole interferometric illumination diagnosis and balancing

Abstract

SUMMARYWith seismic interferometry or the virtual source method, controlled sources can be redatumed from the Earth's surface to generate so-called virtual sources at downhole receiver locations. Generally this is done by crosscorrelation of the recorded downhole data and stacking over source locations. By studying the retrieved data at zero time lag, downhole illumination conditions that determine the virtual source radiation pattern can be analyzed without a velocity model. This can be beneficial for survey planning in time-lapse experiments. Moreover, the virtual source radiation pattern can be corrected by multidimensional deconvolution or directional balancing. Such an approach can help to improve virtual source repeatability, posing major advantages for reservoir monitoring. An algorithm is proposed for so-called illumination balancing (being closely related to directional balancing). It can be applied to single-component receiver arrays with limited aperture below a strongly heterogeneous overburden. The algorithm is demonstrated on synthetic 3D elastic data to retrieve time-lapse amplitude attributes.

Single- and Double-Sided Marchenko Imaging Conditions in Acoustic Media

“…We emphasize that this approach is different from our proposal to image the upgoing and downgoing Green's functions independently and compute their ratio. The latter approach has yet to be demonstrated in 2D, but we expect results to be relatively accurate based on our previous experiences on related multidimensional problems [51]. Imaging by double focusing has been applied in 2D in [28].…”