TY - JOUR ID - TI - Study of Light and Heavy Minerals and Their Effect on Oil Aggregation in the Zubair Formation for the Rumaila Oil Field in Southern Iraq AU - Zainab A. Al- Humaidan AU - Mohanad H. Al-Jaberi AU - Haider K. Al-Mayyahi AU - Zainab A. Al-Mutouri PY - 2022 VL - 63 IS - 9 SP - 3789 EP - 3803 JO - Iraqi Journal of Science المجلة العراقية للعلوم SN - 00672904 23121637 AB - Zubair Formation is the most productive reservoir in southern Iraq, which iscomprised of sandstones, interbedded with shale sequences and sometimescarbonate rock. It is an important formation in the lower Cretaceous cycle in Iraq.Rumaila oil field is the largest oil field in Iraq and the 6th in the world. Two wellswere studied for three depths, one in the southern Rumaila and the other in the north.The study focused on light and heavy minerals in sand fractions and theirrelationship with hydrocarbon assemblages. For the survey to be complete, thesedimentological study of the cores was also conducted. This research aims todetermine the effect of the amount of heavy and light minerals on the generation andproduction of oil in the reservoir layers. The sedimentological results were theprevalence of sand for all depths, especially in Southern Rumaila. The sand ratioranged from 62% to 98%. The rate of heavy minerals in southern Rumaila wasgreater than in Northern on average at 1.17%. Light minerals were the most inNorthern Rumaila up to 99.3% represented in quartz with a high percentage and alittle part of feldspar represented in orthoclase. Heavy minerals were represented inOpaque (24%), zircon (27.6%), tourmaline (18%), rutile (11%), biotite (3%),chlorite (3.6%), muscovite (3.6%), staurolite (2%) and hornblende (3.6%). Theproportion of quartz was the most in light minerals. The average of minerals is ultrastable,and Opaque is the most dominant over the other minerals. Ultra-stableminerals in the sand that contain hydrocarbon assemblage are an index tomineralogical maturity for sandstone rocks. The SEM images showed deformationsin quartz grains due to the high energy; on the other hand, the roundness andsphericity of the grains were evident, especially in Southern Rumaila sands.

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