Solution for geological and technological problems in carbonate sections with developed secondary capacity on the example of Volga-Ural Petroleum and Gas Province deposit

Abstract

As of today many of the old fields are already depleted. Replenishment of the category of oil and gas reserves from the category of prospective resources proceeds mainly due to revising the state of overor underlying layers in the already developed horizon, rather than by exploiting entirely new deposits. Current methods of allocation of complex reservoirs both according to the data of geological and technological studies and the results of commercial and geophysical studies are relevant. In this paper, solutions of geological and technological problems are considered on the example of the carbonate section of the Volga-Ural Petroleum and Gas Province in absorbing wells. Today, by the methods of borehole geophysics, reservoirs capacity in isotropic environment is effectively calculated. In the presence of fracture and cavity porosity, the standard methods of electrometry prove to be ineffective, even for a qualitative interpretation. Therefore, in the complex reservoir with a secondary porosity space structure, construction of interpretation model is used by the following methods of well logging - neutron method (NM), acoustic method (AK) and gamma-gamma density method (GGM-P). To eliminate absorptions, both standard methods and the latest developments were used. The effectiveness of the use of profile packers in absorbing wells is shown.