Factors favoring development of rock reservoirs in the lower part of the Tyumenskaya superdeep borehole

Based on the studied physical properties of rocks in the Tyumenskaya superd eep borehole, major factors favoring formation and development of complex r ock reservoirs in terrigenous and effusive-sedimentary sequences are analyz ed. Analysis has shown that formation of deep-seated rock reservoirs is str ongly related to deep postsedimentary processes whose intensification is go verned by fluid fracturing and static and dynamic stresses, which result in fracture growth and increase in the rate of chemical transformations. The features of rock reservoirs in the Jurassic-Triassic deposits are considere d. The revealed regularities of change In filtration-capacity properties of the terrigenous rocks show that initially porous reservoirs completely dis appear to depths of 4.5-5.2 km. Below, complex fractured and porous-fractur ed reservoirs are abundant. Zones of development of fracturing have been di scovered at depths below 5.5 km. The general regularities of change in rese rvoir rock properties with depth differ from those earlier identified for t he Urengol area.