Logging Interpreting Method Used for Extra-low Permeability Reservoirs in Tuha Basin

In Qiudong and Xiaocaohu Areas of Tuha Basin, pore structure is complex, permeability was highly different in the reservoirs with same porosities, reservoirs and dry layers were hard to be determined in Jurassic extra-low porosity and permeability reservoirs. On the basis of petrophysical characteristic study.reservoirs were classified. The lithologic genesis of reservoirs with complex pore structures was discussed. The reservoir parameters were simulated in combination with different geneses. The reservoir classification criterion was primarily established. The result can meet the demands precision reservoir interpretation, thus field application result is obvious.