البتروغرافية و العمليات التحويرية لتكوين دوكان في آبار مختارة من حقل جمبور، شمال شرق العراق

الملخص EN

Pétrographie investigation of Dokan Ponnation revealed that it consists skeletal grains that are mainly dominated by calcispheres in addition to foraminifera, bio and lithoclasts, ostracods and peloids.

The groundmass is formed from micrite with less sparite.

Several diagenetic processes have show their imprints on the Dokan rocks.

Neomorphism is the more important process which leads to the change of micrite into microspar and then to pseudospar, compaction; both mechanical chemical is other process that ranges from slight to high compaction and is recognized by fracturing and elongating of calcispheres.

Other diagenetic processes include, dolomitization, cementation, dedoiomitization, silicification, anhydration and authigenesis.

Dissolution leads to formation of several types of secondary porosity; e.g.

moldic, Intra and irterparticles, vuggy and fracture porosity.