Porosity and Density Evaluation of Fatha-Hartha interval in East Baghdad Oil Field using Well Log Data

Year 2020, , 215 - 224, 21.02.2020

Maan Abdullah

https://doi.org/10.25288/tjb.653217

Abstract

The present study deals with experimental mathematical equations that link density and porosity with depth. After obtaining density and porosity information from three well logs scattered in the East Baghdad oil field, new empirical polynomial equations (porosity-depth, density-depth) were produced for all the geological formations between the Fatha and Hartha formations. The coefficient of determination (R2) of the equations derived for each formation ranged from 0.11 to 0.93, which was attributed to variable lithological and compaction effects. The depth information of (131) velocity analyses situated on the seismic lines grid covering the field was used for applying the new equations. After the new empirical polynomial equations were applied to the whole field, porosity and density contour maps for the Fatha-Hartha interval were produced. The location of high porosity zones was identified and related to the compaction and petroleum distribution in the field.

Keywords

East Baghdad oil field, Empirical equations, Petrophysical parameters, Seismic velocity analyses

Thanks

The authors are grateful to the University of Mosul, College of Petroleum and Mining Engineering for providing access to their facilities, which greatly helped to improve the quality of this research.

Doğu Bağdat Petrol Sahası’nda Fatha-Hartha Aralığındaki İstifin Kuyu Logu Verisi Kullanılarak Porozite ve Yoğunluk Değerlendirmesi

Abstract

Bu çalışma, yoğunluk ve gözenekliliği derinlikle ilişkilendiren deneysel matematiksel denklemlerle ilgilidir. Doğu Bağdat petrol sahasındaki üç kuyu logundan yoğunluk ve gözeneklilik bilgisi elde edildikten sonra, Fatha ve Hartha formasyonları arasındaki tüm jeolojik formasyonlar için yeni ampirik polinom denklemleri (gözeneklilik-derinlik, yoğunluk-derinlik) üretilmiştir. Her bir formasyon için türetilen bu denklemlerin farklı litoloji ve kompaksiyon etkilerine atfedilen belirleme katsayısı (R2), 0,11 ila 0,93 arasında değişmektedir. Çalışma alanını kapsayan sismik hatlar içinde yer alan 131 hız analizinin derinlik bilgisi, yeni denklemlerin uygulanması için kullanılmıştır. Yeni ampirik polinom denklemlerinin tüm alana uygulanmasından sonra, Fatha-Hartha aralığı için gözeneklilik ve yoğunluk kontur haritaları üretilmiştir. Yüksek gözeneklilik alanlarının yerleri belirlenmiş ve arazideki kompaksiyon ve petrol dağılımı ile ilişkilendirilmiştir.

Keywords

Doğu Bağdat petrol sahası, Ampirik denklemler, Petrofiziksel parametreler, Sismik hız analizleri

References

• Al-Ameri, T.K. and Al-Obaydi, 2011. Khasib and Tannuma oil sources, East Baghdad oil field, Iraq. Journal of Marine and Petroleum Geology, Elsevier, 28, 880-894.
• Alrazzaq, A.A., 2019. Development of East Baghdad Oil Field by Clusters of Horizontal Wells. Iraqi Journal of Chemical and Petroleum Engineering, 20 (3), 75-79.
• Al-majid, M., 1992. The study of compaction in the east Baghdad oil field by using seismic velocity analyses. MSc thesis, University of Mosul, Iraq, (unpublished).
• Darweesh, H.A., Obed, A.M., Albadran, B.N., 2017. Structural study of east Baghdad oil field, central Iraq. World Journal of Engineering Research and Technology, 3 (6), 56-66.
• El-Shari, S.M., 2017. Normal and abnormal porositydepth relationship of tertiary rocks in Soluq depression, NE-Libya. Journal of Science and its Applications, 5 (1), 1-7.
• Midfield Oil Company (MFOC), 2005. “Final Well Reports”, Iraq.
• Ojha, M., and Sain, K., 2014. Velocity-Porosity and Velocity-Density Relationship for Shallow Sediments in the Kerala-Konkan Basin of Western Indian Margin. Journal of Geological Society of India, 84, 187-191.
• Tamunosiki, D, Ming, G.H., Uko, E.,D., Ari, I.T., Emudianughe, J.E., 2014. Porosity modeling of the south-east Niger delta basin, Nigeria. International Journal of Geology, Earth and Environmental Sciences, 4 (1), 49-60.