Petrographic properties of Sandstone Rocks in the Zubair Formation (Tuba Oil Field) in Basrah Governorate, Southern Iraq.

Abstract

The research investigates the study of sandstone rocks within the Zubair Formation in the Tuba Oil Field in Basrah Governorate, southern Iraq, were used Final geological reports for the wells, in addition to petrographic studies conducted on fifteen (15) rock samples distributed across the wells (6 samples from well TU-M, 5 samples from well TU-U, 4 samples from well TU-S).,The petrographic study results indicated that the rocks in the study area are Quartz Arenite, Because it contains a high percentage of more than 93% quartz and very small percentages of feldspar, less than 2%, and rock fragments, less than 6.5%. Sandstone rocks was exposed to diagenetic processes that led to a change in the values of porosity and permeability, it was characterized by high mineral and textural maturity because the grains are well rounded and highly sorted. Regarding chemical and mechanical stability it is observed that all rocks are stable. The Origin classification results showed representing the continental source area (Craton Interior). All these characteristics, including good grain sorting, good raundness, and a low percentage of matrixes, make these rocks suitable for oil reservoirs because they provide high porosity and permeability. This makes it easier to extract oil from them without the need for expensive additional treatments.