The article examines the issues of utilizing well data, geophysical methods, and various measurement techniques for studying abnormally high pore pressure (AHPP) in well-explored structures, while in structures with weakly conducted exploration and prospecting works, more modern approaches such as mathematical calculation (compression curve) methods and computer technologies are applied. For this purpose, we attempted to investigate the method of calculating abnormally high pore pressure (AHPP) through the compression curve. Regardless of the way AHPP is studied, these methods are based on the graphical dependence of the physical properties of clay rocks, their burial depth, and environmental conditions. This dependence follows a certain regularity under normal geological conditions. However, under conditions of abnormally high formation pressure (AHFP), this regularity is disrupted, quantitatively and qualitatively affecting pore pressure in rocks. Although normal and abnormal pore pressures of deeply buried clay rocks can be determined from well data and geophysical methods, in areas with poorly developed exploration works, the compression curve method possessing universal characteristics is more appropriate for determining this parameter. This method not only allows analytical calculation of the parameter but also makes it possible to process its results using electronic computing technologies. In studying the compaction of clay rocks, it has been established that in clays with simple mineralogical composition but varying physical properties, the difference in pressures between the fluids within them follows an exponential dependence, extending in a straight-line direction when plotted on a logarithmic scale. In general, in practice, the exponential dependence of porosity, permeability, and specific electrical resistivity of compacted clay rocks on their burial depth is widely recognized. Deviations from the straight-line trend may result from the high degree of mineralization of the water content in clays, or from the increase in temperature with depth. These phenomena usually occur starting from depths of 800–1000 m. If the increase in temperature with depth is uneven, then the compression curve of this dependence can be constructed by selecting points with equal temperatures or by adjusting the values to equivalent temperature points.