The fractal fifteen thin section showed that the deposition of the Mishrif Formation is gradual upwards. It was deposited in a period that suffered from several marine fluctuations. It began as a cycle of marine retreat that led to the sedimentation of reefs, followed by a short-term marine advance, and then a widespread marine retreat that led to the emergence of sedimentary facies and various Rudist assemblies. Through scrutiny and analysis of the slides, the presence of five main facies (basin facies, slope facies, shallow open marine, shoal, and rudist biostrom environment) was observed. Theresults showed that the morphological processes re-crystallization, decomposition and dolomitization have the greatest role in improving the porosity, in addition to that the Rudist biostrom and shoal facies environment have good reservoir properties in units MA, MB2 and MB2.The modulation processes affecting the development of the reservoir properties of the different units were identified, with an indication of the severity of their impact and their role in the growth and destruction of porous systems. These processes are micritization, dissolution, dolomitization, cementation, recrystallization, stylolitization, and compaction.
Well logs data was analyzed and used to identify reservoir properties. The Mishrif Formation was sudivided into six units (MA, MB1, MB2, MC1, MC2 and MC3) with different potential characteristics. By using the MID method and M-N cross plots to determine the rock and mineral composition of the Mishrif Formation in the X oil field, it was found through the profiles that the Mishrif Formation consists largely of limestone, little dolomite and shale. Based on the CPI results of the two wells (XA and XB)it was noted that the units BM1, BM2 and MC1 reservoir units have good petrophysical properties as they had good porosity ranging from 0.1 to 0.19 with low values of water saturation (0.3-0.79) and shale volume (0.0295-0.070) respectively). Due to these characteristics these units are considered oil-bearing areas are among the most important units in the Mishrif Formation in the X field. while the other units (MA, MC2 and MC3) are considered non-reservoir units due to It has poor petrophysical properties.
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