Abstract:
In this paper, we characterized the natural fracture systems and inferred the state of in situ
stress field through an integrated study in a very complex and heterogeneous fractured carbonate
heavy oil reservoir. Relative magnitudes and orientations of the in-situ principal stresses in a naturally
fractured carbonate heavy oil field were estimated with a combination of available data (World Stress
Map, geological and geotectonic evidence, outcrop studies) and techniques (core analysis, borehole
image logs and Side View Seismic Location). The estimates made here using various tools and data
including routine core analysis and image logs are confirmatory to estimates made by theWorld Stress
Map and geotectonic facts. NE-SW and NW-SE found to be the dominant orientations for maximum
and minimum horizontal stresses in the study area. In addition, three dominant orientations were
identified for vertical and sub-vertical fractures atop the crestal region of the anticlinal structure.
Image logs found useful in recognition and delineation of natural fractures. The results implemented
in a real field development and proved practical in optimal well placement, drilling and production
practices. Such integrated studies can be instrumental in any E&P projects and related projects such
as geological CO2 sequestration site characterization.