Figure 5 c,d,e,f. (c) Thin section photomicrograph of microporous composite grain (plane-polarized light, Saudi Arabia, Qatif field, Arab-C). (d) Epoxy pore cast of microporous composite grain (planepolarized light, Saudi Arabia, Berri field, Arab-A). (e) Higher magnification view of epoxy pore cast of same microporous composite grain shown in (d) above. Microporosity consists of a maze of highly interconnected pore throats (arrows) and larger, more equant micropores (MC). Note similarity between microporous network of composite grain and foraminifer (Figure 4f), ooid (Figure 5b) and micritized grain (Figure 3e). (f) Thin section photomicrograph of microporous micritized grains in microporous matrix (plane-polarized light, unspecified Mesozoic reservoir, Middle East).