*Sedimentary Rock Fabric Characterization DOI: http://dx.doi.org/10.5772/intechopen.108046*

assemblages or patterns with reference to their nature of their grain packing, contacts, sorting, orientation, matrix distribution, mechanical compaction, and intergranular pore-spaces into fabric-type domain type (s). It indicates that a single thin micrograph is not ideal to fully a representation of lithofacies rock fabric, and that there are multiple fabric domains existing within a single lithofacies fabric. Five fabric domain types were mapped into clasts-supported, matrix-supported, random, and laminar and fracture-dominated domains some with subclass types 1 and 2. The subclass types 1 and 2 are distinguishable with respect to their individual matrix compositions filling intergranular pore space as in <10% or > 10% respectively across the domain types.

The concept of fabric domain types has shown existence of a multiple fabric domain in a lithofacie and pore volume distribution (porosity) and pore sizes within them differ and at some point are closer in ranges. However, a lithofacie that exhibits poor intergranular pore-space distribution, termed poorly porous, may experience high permeability values and sudden decline in reservoir pressure due to the occurrence and abundance of the fracture-dominated domains or oversize pore size within the different domain types that are not fully noted during petrographic description using a polarized microscope only. But if such micrographs are scanned as propose here, it will be understood from the reservoir behavior that it was a response due to the abundance of the fracture-dominated domain or an oversize pores presence within the lithofacies. Therefore, when investigating, describing variability, or predicting a reservoir macroscopic behavior, the type of heterogeneity should be defined in terms of the fabric characteristic and the presence or absence of certain dominant fabric domain types needed to be considered critically in sedimentary rock characterization.
