Finite deformation rotation of oil and gas reservoir and its fracture prediction -A case:Lower Paleozoic carbonate reservoir in Daqing Tract of Talimu Basin

Using the theory of finite deformation mechanics,a displacement function of the gas and oil reservoir deformation is established,and a new method recovering the confiquration before deformation of reservoir is proposed.Strain-Rotation decomposition has been made in the geological structural deformation.Adopting the gradient of mean rotation angle(θ) as the basic characteristic quantity,finite deformation rotation fields in Daqing tract of Talimu basin are studied.By the thinking that the local rotation or the discord rotation of the media will induce fractures,we forecast the fracture favorable regions of the Carbonate rock reservoir and satisfied results are gained.