Abstract:

Paleokarst cave carbonate reservoir is a kind of special reservoir formed by karstification, and it possesses complex
development characteristic and extremely strong heterogeneity. So the conventional modeling method of clastic reservoir can
not be applicable to paleokarst carbonate reservoir. Based on the analysis of state-of-art research, taking the Tahe oilfield as
an example, several key issues of paleokarst cave reservoir modeling are discussed, including the causes of reservoir, making
use of soft and hard data for modeling, an improved modeling method by considering vertical zoning of karst, planar partition of
paleogeomorphology and karst facies. Several problems needed to be improved are discussed as well, including mathematical
algorithms and characterization of reservoir petrophysical property. We suggest that the characterization of complex shape,
assembly relations and internal filling characteristic would be topics for future research. The application of multiple point
geostatistics is feasible. Petrophysical property characterization according to reservoir filling degree and the fillings type is helpful
to build more accurate geological model.

Key words: Tahe oilfield, carbonate, paleokarst reservoir, geological modeling