Transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis: A case study of the Cretaceous of the Mesopotamia Basin in the Middle East

YE Yu,LI Fengfeng,SONG Xinmin,GUO Rui

Fig. 6. Photos and schematic diagram of cast thin sections of Mishrif Formation at 2868.78 m in Well M-46 in M Oilfield, the Middle East. (a) Panoramic scanning of a cast thin section which is dyed in red (left part) and undyed in white (right part); (b) Schematic difference of burrows and matrix; (c) Dyed, single polarized light. The field of vision is matrix that is clastizoic micrite, and the bioclasts are mainly Nuculina and Ostracoda. (d) Dyed, single polarized light. Within the field of vision, there are matrix, burrows and burrow halo. The burrows are filled with dolomite and residual bioclasts, and a small amount of dolomite and matrix micropores in the burrow halo. (e) Dyed, single polarized light. The field of vision is burrows mainly filled with dolomite and residual metasomatic bioclasts, and intercrystalline pores are relatively well developed.