Lithological and Geochemical Heterogeneity of the Organo-Mineral Matrix in Carbonate-Rich Shales

The paper discusses the issues of interaction organic matter and siliceous-carbonate mineral matrix in unconventional reservoirs Upper Devonian Domanik Formation Kama Depression Volga-Ural Basin. is composed organic-rich low-permeability rocks. Lithological geochemical peculiarities rocks were studied using light microscopy, X-ray diffraction analysis (XRD), scanning electronic microscopy (SEM), evaporation method. Organic was examined by Rock-Eval pyrolysis with quantitative qualitative evaluation generation potential maturity degree. Integrated results lithological studies allowed identifying intervals section where can form a complex association matrix. It fixed experimentally that some cases carbonate one-whole high-molecular compound. authors supposed course sedimentation, immobilized into structure At deposition diagenesis stage, interacts acids forms natural organo-mineral polymers. Special physicochemical properties such associations shed new onto problems producing from hard-to-develop nonconventional evaluating associated risks.