Abstract: The regional classification of Jurassic reservoirs and a great deal of data about porosity and permeability of 8 000 samples are analyzed. It is pointed out that the Jurassic reservoirs are generally characterized by moderate-low porosity and lower permeability, where the Oxfordian and Bathonian stages are of the maximum values, while the Alinbayios and Toar stages the relatively low, and the Plinsbahe and Hettangian-Xinemuer stages the minimum. The pay zones$Ю_{1}^{1}-Ю_{1}^{4}$,Ю₂,Ю₃ are moderate in porosity and moderate-lower in permeability. How well the poroperm characteristics of these reservoirs depend upon the buried depths of them. The Upper Jurassic sands are moderate in effective porosity ranging from 14.2% to 11.2% and intergranular permeability from 236×10^-3μm² to 19.62×10^-3μm²; the Lower Jurassic sands (in depth of 2 750—3 750 m) range from 14.8% to 7% and from 7.90×10^-3μm² to 0.03×10^-3μm²; below depth of 4 250 m the granular reservoirs of Jurassic are in limited distribution, their petroleum potentials are possibly related to secondary undercompaction and fractured reservoirs development. It is concluded that the values of poroperm characteristics of Jurassic reservoirs in northern West Siberian province are decreased with the buried depth due to different compactions of the overburden pressures.

Key words: oil-gas pool, reservoir rock, poroperm characteristics, effective porosity, intergranular permeability