USING PAIR-CORRELATION FUNCTION AS A TOOL TO IDENTIFY THE LOCATION FOR SHALE GAS/OIL RESERVOIR BASED ON THE EXPERIMENTAL WELL LOG DATA

Shale gas reservoirs, as unconventional resources, are becoming an increasingly important exploration, development, and production target in the oil industry. However, geophysical characterization of these unconventional reservoirs remains challenging because of poor understanding of geophysical responses to reservoir properties. Pair-correlation function is determined as a product of fluctuations of random functions at two arbitrary points. Based on the experimental data from four different wells, I calculated the pair-correlation function and its relative parameter: amplitude-correlation value. The results showed that the productive layers have high pair-correlation value and non-productive layers have a low correlation value and suggest that amplitudes of pair-correlation function reflect the level of the difference between the inclusions and the material rocks, so the increasing of the organic content generally enhances the amplitude of pair correlation. Hence, the results of these calculations show the potential applications of pair-correlation function and its amplitude for the detection of the productive layers. Therefore, we can use pair-correlation function and its amplitude as a tool to predict the location for shale gas/oil reservoir and to estimate the thickness of productive layer in productive well. Furthermore, we also can use amplitude of pair-correlation function with elasticity tensor components and Vp/Vs ratio to distinguish the productive wells from non-productive wells.