Application of Gassmann's Model and the Modified Hashin-Shtrikman-Walpole Model in Land Subsidence Susceptibility Studies in the Jxt Field, Niger Delta

Abstract

This paper investigates the susceptibility of the 'JXT' field, onshore Niger Delta to ground subsidence as an after effect of oil and gas production. Logs from two wells in the field were utilized for this study, Gassmann's model and the modified Hashin-Shtrikman-Walpole model for compressibility analysis were adopted. The results from Gassmann's model range from 0.06GPa-1 to 0.13GPa-1, while results from the modified Hashin-Shtrikman-Walpole bounds for compressibility range from 0.04GPa-1 to 3GPa-1. To further evaluate the susceptibility of the field to ground subsidence, some important elastic parameters were estimated. Results show young modulus (20.5-27.5GPa), bulk modulus (21.3-25.3GPa), shear modulus (8.01-11.2GPa), and Poisson ratio (0.23-0.28). Generally, these results indicate that the study area is less susceptible to ground subsidence and there is little risk of flooding and submergence which can be hazardous to oil and gas production