Microtexture and mineralogy as well as organic content are highly important features in assessment of unconventional reservoir rocks. Type of minerals prevalent in combination with their quantity determinates reservoir and mechanical properties of these rocks. Therefore, detailed lithology combined all of descripted parameters is necessary for properly alignment model of unconventional reservoirs. The article presents comparative lithology characterization of rocks from upper part of the Khadum Formation section. The studies include investigationы of core material from two wells: № 1 is located in the Prikuma zone of uplifts, № 2 – the Tersko-Caspian foretrough. As a result, unfolded differences in microtexture and mineralogy are the following: clay and carbonate minerals content, which determinates the degree of compactness and fracturing susceptibility. It is clearly seen that for the rocks from the Tersko-Caspian foretrough carbonate admixture presence expressed in more compacted microtexture and structure as well as less fracturing developing. The differences in TOC content and productivity index also were determinate. The rocks in the Tersko-Caspian foretrough have more generative potential and predominantly express higher level of maturity.


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