عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The Marun oilfield is located in the middle part of the folded Zagros structural zone, in the Dezful embayment. In this study, the segmented zones of this reservoir anticline were determined lithologically using subsurface and Geolog software. In determining reservoir zones factors such as types of porosity and shale volume were considered. Petrophysical studies using neutron-density, neutron-sonic, density- sonic and M-N cross plots show that carbonate is the dominant lithology in this reservoir. Based on well log data analysis and using neutron-density cross plot, the Asmari Formation is in good porosity especially in the upper part. For this reason, these parts have better reservoir quality than the lower part. Also, the accuracy of the evaluation performed in the borehole studied is in accordance with the core porosity. In the present study, the average shale volume based on the CGR log is 25.33%, of which the largest amount of shale is concentrated in the lower part of the formation. Since each sedimentary sequence can be composed of one or more lithological zones with their own lithological and petrophysical characteristics, so in the present study 5 zones were identified in the studied borehole. In this study, zone A corresponds to the upper part and zone E belongs to the lower part of the Asmari Formation . Analysis of available data, appropriate porosity in the whole Formation and low shale volume, especially in zones A, to D indicate that almost all of the Formation in the Marun oilfield has a suitable reservoir potential.