PROCESSES OF MINERAL DISSOLUTION AND REGENERATION IN THE SANDSTONES OF COAL DEPOSITS

UDC552.1/.5:622.277.3.004.67

Authors:

MametovaL.F., Ph.D. (Geol.), Senior Researcher

(IGTM NAS of Ukraine)

Abstract.

Mineral dissolution and regeneration are fundamentally pertinent to the lithogenesis and catagenesis.  Studies of these processes in sandstone of the coal deposits demonstrated their influence on physical, mechanical and collector properties of not only the sandstones themselves, but also of the rocks in the stratigraphic column as they undergo geochemical changes.  Porosity, hydraulic conductivity, density, gas saturation, susceptibility to ductile deformation and other rock properties depend on the minerals and their behavior in the changing environment. Quartz and carbonates are the most common minerals in sandstones of the coal deposits.  They are polygenetic, occurring both as detrital grains and cement, and are characterized by high mechanical resistance (especially quartz). However, chemical reagents dissolve carbonates completely, while quartz is dissolved only partially. Changing conditions (as in catagenesis) also lead to new growth of these minerals. Temperature, pressure, pH and fluids are the factors which discretely affect the chemical reaction rates, structural varieties of minerals and their properties and properties of the rock column as a whole. The secondary quartz overgrowths and the presence of several generations of carbonates are used for modeling paleotectonic movements that trigger them. 

Keywords: sandstones, catagenesis, dissolution, regeneration, quartz, carbonates.

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About the authors:

Mametova Liudmyla Fedorivna, Candidate of Geology (Ph.D), Senior Researcher in Laboratory of Researches of the Structural Changes in the Rock in Department of Geology of Coal Beds at Great depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM NASU), Dnipropetrovsk, Ukraine. Этот адрес электронной почты защищен от спам-ботов. У вас должен быть включен JavaScript для просмотра.