Abstract: Igneous-rock reservoirs in China are mainly distributed in XinJiang, where they have been under water injection recovery for several years. Performance data show that these reservoirs are characterized by: great variation in productivity among oil wells, quick decline of producing ability for both oil wells and oil
field, non-existence of a stable production period, and marked difference in absorption capacity among injection wells. Furthermore, during injection production, a few producing wells would experience severe water channeling or be quickly flooded out while most other wells would not witness injection effect for a long time. And the oil recovery is typically around 813%. All
these are consistent with the geological character of well-developed fractures and strong heterogeneity of the reservoirs. In accordance with such characteristics, it is strongly suggested that in the development of these reservoirs water injection be carefully planned, more attention be given to the management of the high-production wells, and water injection into the well
groups experiencing severe water channeling be terminated or kept at interval.

Key words: igneous-rock reservoir, fracture, injection production, decline, flood-out