Abstract
Dezfol embayment in the Southwest of Iran is located in the Zagros fold-thrust belt, which is one of the world’s largest petroleum provinces. Ilam Formation (Santonian-Companian) is one of the reservoir formations in this area that has been less studied. This paper focused on reservoir properties in this formation using petrography and petrophysics data. According to the petrography studies Ilam Formation composed of limestone as dominant lithology. Detailed petrographic analyses, have led to identification of 10 micro-facies which are represented as a carbonate ramp depositional model. Also petrographic analyses are revealed that cementation, dissolution, compaction and dolomitization are most important digenetic processes. Detailed petrographic analyses and petrophysics data showed that due to mud-supported nature of more facies (inherited low reservoir potential from their depositional settings), diagenetic process plays an important role in increasing of reservoir quality. However cementation and dissolution had negative and positive effects on Ilam reservoir formation, respectively. Finally at the end for better correlation and to create a flow unit, according to the petrography data and using petrophysics log, this reservoir is divided into 5 units (flow unite) by using Geolog software and then they have been correlated across the field.
Highlights
More than 65 percent of proven petroleum resources in the world and 34 percent of gas fields of the world are located in giant hydrocarbonic fields in the Middle East [1] [2]
Diagenetic processes have an important control on reservoir characteristic, in which even the quality of reservoirs can be investigated by studying of the diagenesis processes [5]-[10]
Detailed petrography analysis and well-logging data which are provided by Geolog professional software, this Formation is divided into five different zones of reservoir units
Summary
More than 65 percent of proven petroleum resources in the world and 34 percent of gas fields of the world are located in giant hydrocarbonic fields in the Middle East [1] [2]. Zagros is one of the most important fold belts and active tectonic in the Middle East that is suited in South-West of Iran, between the Arabian Plate and Center of Iran [1] [3] [4]. This area containing lucrative reservoir bodies and including enormous hydrocarbonic fields is famous as one of the richest oil belts in the world [1] [2]. The goal of this study is survey of effect of diagenetic presses on reservoir properties and flow unites determination in the Ilam Formation of Dezfol embayment using petrography evidence and petrophysics data (such as [14] [15], and many others)
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