Reducing Uncertainty in the Geological Interpretation of Complex Structural Geometries Through Seismic Forward Modelling: Application to Frontal Ranges of the Llanos Basin, Colombia

Abstract

Seismic imaging and resolution frequently present a critical issue in defining reservoir geometry and closure, greatly affecting estimated hydrocarbon volumes and well planning. This problem is compounded in compressional systems, where even normally seismically resolvable structures are frequently poorly imaged due to complex or steeply dipping strata. As a result, multiple geometric interpretations may be consistent with the available subsurface data. This study considers a suite of alternate interpretations for duplexes beneath the Nunchia Syncline of the frontal ranges of the Llanos Basin, Eastern Cordillera, Colombia. Seismic forward modelling is used to simulate these cases, varying structural configuration and pore fluid content, to gain further insight on effective interpretation strategies. Subsequently, synthetic volumes are compared to each other, and against the actual data to explore more subtle geometric changes in the forelimb of related fault propagation folds. We propose that utilising seismic forward modelling will assist in reducing interpretation uncertainty in these settings.

AAPG Datapages/Search and Discovery Article #90216 ©2015 AAPG Annual Convention and Exhibition, Denver, CO., May 31 - June 3, 2015