Method for identifying non-screening clayey rocks, clayey and clayey-carbonate differences of fluid seal, places of accumulation of hydrocarbons in oil and gas bearing structures according to the physicochemical characteristics of rocks

摘要

FIELD: geology; physical-chemical methods of oil and gas search by deep well cores.SUBSTANCE: method includes selection of clay samples from the section, establishment of secondary color and presence of hydrocarbons; separation by way of water immiscibility into clayey and clayey-carbonate differences; disintegration of weakly and tightly cemented clay-carbonate rocks; measurement of oxidation-reduction potential Eh and alkali-acid properties of pH; determining dry residue weight of soluble salts; determining quantitative predominance of monovalent and divalent soluble rock cations relative to each other; extraction of clay fraction; determining reversible and irreversible clay substance coagulates; determination of clay fraction mass. At that, the interval characterized by deposition of carbonates in clay hydrophilic rock, abnormal decrease of dry residue weight and fraction of Ca++, Mg++ cations, with respect to the proportion of Na+, K+ soluble salts, which corresponds to movement of cations Ca++, Mg++ from soluble rock salts and from reservoirs of clay minerals absorption into insoluble carbonates.EFFECT: higher information value and reliability during search.1 cl, 3 tbl, 2 ex, 6 dwg