f 2D SEISMIC MODELING OF THE FAULT SHADOW EFFECT IN THE LLANOS BASIN (COLOMBIA)

The 3D seismic tool has almost entirely replaced 2D seismic for petroleum exploration in the Llanos Basin (Colombia). Hydrocarbon traps in the Basin are related with up-to the basin normal faulting, sometimes subtle and quite difficult to image on 2D. The intensive use of 3D seismic has provided a much better imaging of these subtle structural traps and has led to a considerable increase in the exploration success. However, the 3D seismic still presents some pitfalls for the structural imaging, being the fault shadow one of the most puzzling effects in the 3D seismic interpretation in the Llanos Basin.