Assessing hydrocarbon prospects in Abu Madi formation using well logging data in El-Qara field, Nile Delta Basin, Egypt

Mohammad Abdelfattah Sarhan

doi:10.1007/s13202-021-01214-1

Mohammad Abdelfattah Sarhan

https://doi.org/10.1007/s13202-021-01214-1

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Abstract

In this work, the petrophysical properties of Abu Madi reservoir in El-Qara Field at northern Nile Delta Basin (NDB) were evaluated depending on well logging data of two wells: El-Qara-2 and El-Qara-3. This evaluation revealed that in El-Qara-2 well, the promising gas zone is detected between depths of 3315 and 3358 m, while in El-Qara-3 well, the best gas interval is detected between depths of 3358 and 3371 m. In addition to the production test parameters (gas rate, condensate rate, gas gravity, condensate gravity, gas-to-oil ratio, flowing tubing head pressure, flowing bottom hole pressure, and static bottom hole pressure), the calculated petrophysical parameters (shale volume, total porosity, effective porosity, and water saturation) for both intervals were relatively similar. This confirms that the investigated wells were drilled at the same reservoir interval within Abu Madi Fm. The depth variation in the examined zones was attributed to the presence of buried normal faults between El-Qara-2 and El-Qara-3 wells. This observation may be supported from the tectonic influence during the deposition of Abu Madi Fm. as a portion of the Messinian syn-rift megasequence beneath the NDB.

Highlights

Nile Delta Basin (NDB) is a passive-margin basin occupying approximately 250,000 k m2 in the eastern Mediterranean area
The results of different choke sizes (1/4, 3/8, 1/2, and 5/8 inches) for both wells are summarized and shown in Figs. 8 and 9. These results indicate that the characteristics of the promising zones in the two wells were relatively similar, including the produced gas rate (Q gas), produced condensate (Q condensate), gas gravity, rate condensate gravity, gas-to-oil ratio, flowing tubing head pressure, flowing bottom hole pressure, and static bottom hole pressure
These findings confirm that the two zones are the same hydrocarbon reservoir extending within El-Qara Field, they are located at different depths. This depth variation is attributed to the presence of normal faults between El-Qara-2 and El-Qara-3 wells (Fig. 10)

Summary

Introduction

Nile Delta Basin (NDB) is a passive-margin basin occupying approximately 250,000 k m2 in the eastern Mediterranean area. Abu Madi Fm. consists of sandstone and shale intercalations (Rizzini et al 1976), which was deposited during the Messinian age (Egyptian General Petroleum Corporation (EGPC), 1994; El Heiny and Morsi 1992). The petrophysical properties of the reservoir intervals within the sandstones of Abu Madi Fm. in El-Qara-2 and El-Qara-3 wells were assessed to examine the efficiency of these intervals as gas-bearing resources in El-Qara Field in NDB.

Results

Conclusion