Abstract
Core samples are the most reliable source of geological data, yet their storage conditions are often neglected. Despite their scientific and economic value, cores are frequently kept in unheated shelters or outdoors, leading to property degradation and irreversible damage. Proper preservation requires controlled temperature, humidity, and environmental conditions—failure to maintain these results in both data and financial losses. This study examines how temperature fluctuations and humidity affect core integrity using the Brazilian test (uniaxial compression). Were analyzed 35 core samples from the H and BH fields (Precaspian Basin) under simulated seasonal cycles: heating (20°C, 60% humidity), freezing (−35°C), and dry heating (60°C). Results show progressive strength reduction, with samples deteriorating fastest under repeated freeze-thaw cycles. Data are presented via graphs and tables, demonstrating that improper storage significantly weakens core material over time. The findings highlight the need for climate-controlled storage to preserve core quality for future studies.