Secondary transformation of reservoirs in oil-water contact zone

Authors: S.V. Onuchin (Tomsk Polytechnic University)

The basic processes of secondary mineral formation, proceeding in water-oil contact zones, are considered. Structu - ral-mineralogical zonality of reservoirs in water-oil contact zones is given. The scheme of change of the oil-satureted reservoir in the water-oil contact zone is given. It is noted, that change of rocks at the water-oil contact often determines the formation of a secondary porosity: sedimentogene pores increase, intragrain pores of leaching are formed, degree of pores intercommunication, porosity and permeability of rocks increase.

The basic processes of secondary mineral formation, proceeding in water-oil contact zones, are considered. Structu - ral-mineralogical zonality of reservoirs in water-oil contact zones is given. The scheme of change of the oil-satureted reservoir in the water-oil contact zone is given. It is noted, that change of rocks at the water-oil contact often determines the formation of a secondary porosity: sedimentogene pores increase, intragrain pores of leaching are formed, degree of pores intercommunication, porosity and permeability of rocks increase.



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