*3.2.3 Test for heterogeneity and flow unit characterization of the N5.2 sand*

Dykstra-Parson's coefficient is an expression that measures the degree of variation and heterogeneity of a reservoir [26]. The variation in the values of the core permeability reflects the degree of heterogeneity in the reservoir. Rock samples with zero permeability values (shales) were not used since it is a logarithmic plot. The Dykstra-Parson plot performed for the core samples from the well section is shown in **Figure 9**. The Dykstra-Parson's number for the core samples is 0.30—which indicates a homogenous reservoir. Higher values of Dykstra-Parson indicate more heterogeneity of which one is the maximum number.

**Figure 10.** *Winland plot for the N5.2 sand.*

*Sedimentary Processes - Examples from Asia, Turkey and Nigeria*

properties of the sand facies.

the reservoir (**Figure 5**) with over 83% NTG and negligible volume of shale (VSH) (**Figure 7**). This implies that the reservoir flow mechanism will be influenced by the

**18**

**Figure 9.**

*Dykstra-Parson plot for heterogeneity test (N5.2 VDP = 0.3).*

**Figure 8.**

*Porosity model for N5.2 sand.*

#### **Figure 11.**

*RQI versus normalized porosity crossplot. Note that most of the samples have high quality index with RQI above 100. This is indicative of a high quality formation with high hydraulic potential.*

The hydraulic capacity of the sand-body was well understood from plots generated from Winland and Rock Quality Index for flow zone characterization (**Figures 10** and **11**). Most of the samples plot within 1000 mD on Winland plot, showing a mega porous reservoir with a high quality index (**Figure 10**). Beside the presence of fractures that have created anisotropic condition in the homogenous geobody, excellent reservoir quality will enhance fluid flow in the reservoir [25]. Reservoir properties have major influence on reservoir fluids and the hydraulic behavior of the rock. It is important that these uncertainties are well understood because they are relevant to reservoir management decisions.
