BUILDING A PETROPHYSICAL MODEL FOR A LOW POROSITY AND HIGHLY TECTONIZED RESERVOIR. FIELD CASE: PAUTO COMPLEX - COLOMBIA.

摘要

The present work is focused on defining a methodology that allows a reliable estimation of the basic parameters for the petrophysical model to support both the in-place volumes (GIIP) and the well productivity for the Pauto Complex field in the Piedemonte foothills. The methodology is based on the integration and understanding of all available data with emphasis on the capillary pressure, core fluorescence and well production. Pauto Complex is part of a series of imbricated thrust sheets developed as result of the Colombian Eastern Cordillera uplifting. It was discovered in the early 90s and is currently under development stage. Mirador formation is the reservoir rock, which is mainly a quite clean quarzoarenite (95% SiO2) and very continuous through and across the entire field. The structure has been interpreted as elongated NE-SW asymmetric anticlines bounded by east verging fore-thrust and associated back-thrust that runs parallel to the structure axis. Tectonism and a deep depositional environment played a strong role on the rock deformation and diagenesis, resulting in a very complex system either structurally and rock quality system, where both the matrix and the natural fractures contribute to well productivity.