Abstract: Tahe oilfield undergone multi-stage tectonic evolution and paleo-weathering karstification belongs to a fractured-vuggy carbonate field with strong heterogeneity. To study its interwell communication or connectivity is greatly helpful to classifying the development block and further improving the development performance of Ordovician reservoir. By means of dynamic production data and Orkiszewski method for bottom hole pressure calculation, the formation conductivity is estimated and evaluated, the interwell connectivity is analyzed. The result is consistent with static geologic study. And this method, integrated with other available data, can be used to more precisely classify the connected blocks of reservoir.

Key words: Tahe oilfield, carbonate reservoir, connectivity, interwell communication, fluid productivity index