## 4 Results
### Pore Pressure Prediction from Resistivity and Sonic Logs
Figure 5: The fracture and pore pressure gradients to depth for E-BK1. The predicted pore pressure values for the reservoir interval during drilling in E-BK1 are 4258.03 psi (PP_Res) and 4196.80 psi (PP_Sonic) (Figure 3). Fluids are free to move in this interval, hence the decrease in pore pressure at the wellbore. E-BK1 has with normal pressure formations at the selected reservoir interval (Figures 3-5). In E-AJ1, an overpressured zone was identified (2685 m to 2716 m, and 2716 m to 2735 m), showing an increase in pore pressure due to more fluid in the pore spaces and giving the values of 3939.27 psi (PP_Res) and 4334.08 psi (PP_Sonic). The pore pressures predicted for the studied reservoir interval (2677 m to 2735 m) are psi 4310.06 psi (PP_Res) and 3818.78 psi (PP_Sonic). In E-CB1, the interval of interest ranges from 2509 to 2544 m in Figure 6. E-CB1 has normal pressure formations, as demonstrated by the Normal Compaction Trend on both NCT-Res and NCT_Sonic on tracks 4 and 5 (Figure 6), which showed a decrease in shale sonic values and an increase in shale resistivity with readings of 93 us/f and 7.13 ohm/m, respectively. Furthermore, these data suggest the presence of hydrocarbons in the formations. The overburden gradient (OBG) and overburden pressure showed values of 17.28 Ibs/gal (2.07 gm/cc) and 7442.56 psi, meaning that the well would penetrate through a higher overburden water column, resulting in increased overburden pressure (Figure 7). The pore pressure gradients (PPG) were used to calculate the mud weight of 8.28 Ibs/gal (0.992 gm/cc) for PPG_Res and PPG_Sonic, respectively. The fracture gradients were estimated at 13.03 Ibs/gal (1.56 gm/cc) for FG_Res and 13.35 Ibs/gal (1.60 gm/cc) for FG_Sonic (Figure 8). The fracture gradient determines the maximum mud weight needed to drill a well. A mud weight (MW) of 6.64 Ibs/gal (0.79 gm/cc) was estimated. According to these estimated data, the fracture gradient (FG) is higher than the mud weight (MW), suggesting that E-CB1 would be stabilized. This stability means that there would be no circulation or mud loss throughout the drilling  
Figure 6: The resistivity model, sonic model, pore pressure gradient, and fracture pressure gradient for E-CB1 estimated using the Eaton methods with a depth-dependent NCT. process. The fracture pressures were estimated to be 2212.41 psi (FP_Res) and 2445.12 psi (FP_Sonic). These fracture pressure values made it possible to determine the pressures needed to break the formation and induce mud loss into the borehole. Within the targeted reservoir range of 2509 m to 2544 m depth, the effective stress (ES) was \(-10.17\) gm/cc. Because of the adverse effect of effective stress, drilling deeper than the chosen interval may result in an overpressured zone. The pore pressure values of 3563.74 psi (PP_Res) and 3578.75 psi (PP_Sonic) are expected to be encountered during the  
Figure 8: The fracture and pore pressure gradients to depth for E-CB1. Figure 7: Pore pressure versus depth for E-CB1. drilling of the formation (Figures 6-8). A comparison of the pore pressure results estimated from different methods is presented in Table 2.