Reservoir and Rock Type Characterization: Case Study for Khasib Formation, Southern Iraq
DOI:
https://doi.org/10.31699/IJCPE.2024.1.11Keywords:
Reservoir Characterization, Flow Zone Indicator Method, Hydraulic Flow Unit, Cluster Analysis, Winland Correlation, Lucia Classification, Khasib FormationAbstract
Characterizing the reservoir accurately and understanding its rock’s composition is essential in predicting performance and determining reservoir designs. In this study, the carbonate Khasib formation from the late Cretaceous period for x oil field- southern Iraq has been examined characterizing. To achieve this, different characterization techniques were utilized. Firstly, using the flow zone indicator method revealed five hydraulic flow units (HFUs) of the Khasib formation. Every HFU represents a particular quality of reservoir rock. HFU1 is the one that refers to poor quality, while bad-quality reservoir rock is displayed as HFU2. HFU3 and HFU4 signify the intermediate and good reservoir rock quality respectively. The last hydraulic flow unit was of the highest quality reservoir rock which is denoted as HFU5. Additionally, we utilized cluster analysis to identify five distinct rock types within the Khasib formation. These rock types were labeled as RT-1 (the best reservoir rock type), RT-2 (good reservoir rock type), RT-3 (intermediate reservoir rock type), RT-4 (poor rock type), and RT-5 (very poor rock type). In addition, the recognition of five different HFUs that reflected the physical characteristics unique to each reservoir rock was achieved using Winland’s approach. Rock properties inside the reservoir are classified to HFU1 for best rocks, then HFU2 denotes good rock qualities through a medium one labeled as HFU3 while later HFU4 indicates poor quality, and the poorest quality is marked as HFU5. Finally, Lucia's classification for carbonate rock was employed as another analyzing rock quality method. Utilizing this technique reveals three distinct rock types within the Khasib formation. RC1 is the microfacies of grain stone, RC2 is the representative of pack-stone microfabrics and RC3 denotes muddy materials. The final rock types (facies) for Khasib formation can be identified according to the incorporation of the different characterization methods which can be utilized to create a realistic three-dimensional rock type model and distribute the properties based on the rock type.
References
Y. Z. Ma and P. R. La Pointe, Uncertainty Analysis and Reservoir Modeling, 2011. https://doi.org/10.1306/m961330
A. M. Ali and A. A. Alhaleem, “Determination of reservoir hydraulic flow units and permeability
estimation using flow zone indicator method,” Iraqi Journal of Chemical and Petroleum Engineering, vol. 24, no. 2, pp. 89–95, 2023. https://doi.org/10.31699/ijcpe.2023.2.10
N. R. Goins, “Reservoir characterization: Challenges and opportunities,” All Days, 2000. https://doi.org/10.4043/11906-ms
W. Kramers, "Integrated Reservoir Characterization: from the well to the numerical model", Proceedings, 14th World Petroleum Congress, 1994.
S. Owen and N. Nasr, "Stratigraphy of the Kuwait-Basra Area. In: Weeks", R. (Ed.), Habitat in Oil. AAPG Symposium, pp. 1252–1278, 1958.
B. Al-Qayim, "Sequence stratigraphy and reservoir characteristics of the turonian-coniacian the Khasib formation in central Iraq ", Journal of Petroleum Geology, vol. 33, no. 4, pp. 387-403, 2010. https://doi.org/10.1111/j.1747-5457.2010.00486.x
B. A. Al-Baldawi, “Petrophysical evaluation study of Khasib Formation in Amara Oil Field, southeastern Iraq,” Arabian Journal of Geosciences, vol. 8, no. 4, pp. 2051–2059, 2014. https://doi.org/10.1007/s12517-014-1371-5
M. Sattam, G. A-Sharaa and M. AbedHindi, "Micro Facies Analysis and Development of Diagenetic Processes in Khasib Formation in Selected Oil Wells, Southeast of Iraq", Journal of University of Babylon for Pure and Applied Sciences, vol. 26, no. 4, pp. 187-197, 2018.
A. Mohammed, M. Dhaidan, S. Al-Hazaa, S. Farouk and K. Al-Kahtany, "Reservoir characterization of the upper Turonian – lower Coniacian Khasib formation, South Iraq: Implications from electrofacies analysis and a sequence stratigraphic framework", Journal of African Earth Sciences, vol. 186, pp. 104431, 2022. https://doi.org/10.1016/j.jafrearsci.2021.104431
A. Soleymanzadeh, S. Parvin and S. Kord, "Effect of overburden pressure on determination of reservoir rock types using RQI/FZI, FZI* and Winland methods in carbonate rocks", Petroleum Science, vol. 16, no. 6, pp. 1403-1416, 2019. https://doi.org/10.1007/s12182-019-0332-8
J. Amaefule, M. Altunbay, D. Tiab, D. Kersey and D. Keelan, "Enhanced Reservoir Description: Using Core and Log Data to Identify Hydraulic (Flow) Units and Predict Permeability in Uncored Intervals/Wells", All Days, 1993. https://doi.org/10.2118/26436-ms
J. Kozeny, “Uber Kapillare Leitung des Wassers im Boden”. Sitzungsberichte. Royal Academy of Science, Vienna, Proc. Class 1, vol. 136, pp. 271-306, 1927.
P. C. Carmen, "Fluid Flow through Granular Beds". Trans. AIChE, vol.15, pp. 150-166, 1937. https://doi.org/10.1016/S0263-8762(97)80003-2
D. Davies and R. Vessell, "Identification and Distribution of Hydraulic Flow Units in a Heterogeneous Carbonate Reservoir: North Robertson Unit, West Texas", All Days, 1996. https://doi.org/10.2118/35183-ms
P. Tan, M. Steinbach, A. Karpatne and V. Kumar, "Introduction to data mining", 2006.
T. Euzen, E. Delamaide, T. Feuchtwanger and K. Kingsmith, "Well Log Cluster Analysis: An Innovative Tool for Unconventional Exploration", All Days, 2010. https://doi.org/10.2118/137822-MS
T. Euzen, and M.R. Power, “Well Log Cluster Analysis and Electrofacies Classification: A Probabilistic Approach for Integrating Log with Mineralogical Data”, AAPG, 2012.
H. D. Winland, “Oil accumulation in response to pore size changes, Weyburn field, Saskatchewan”. Amoco Production Research Report No. F72-G25, 1972.
S. Kolodzie, "Analysis of Pore Throat Size and Use of the Waxman-Smits Equation to Determine Ooip in Spindle Field, Colorado", All Days, 1980. https://doi.org/10.2118/9382-MS
F. J. Lucia, J. W. Jennings, M. Rahnis, and F. O. Meyer, “Permeability and rock fabric from wireline logs, Arab-D reservoir, Ghawar Field, Saudi Arabia,” GeoArabia, vol. 6, no. 4, pp. 619–646, 2001. https://doi.org/10.2113/geoarabia0604619
J. W. Jennings and F. J. Lucia, “Predicting permeability from well logs in carbonates with a link to geology for Interwell permeability mapping,” SPE Reservoir Evaluation & Engineering, vol. 6, no. 04, pp. 215–225, 2003. https://doi.org/10.2118/84942-pa
F. Lucia, “Carbonate Reservoir Characterization- An Integrated Approach”. Second Edition. Springer, 2007. https://doi.org/10.1007/978-3-540-72742-2
P. Zhang, J. Zhang, J. Wang, M. Li, J. Liang and Y. Wu, "Flow unit’s classification for geostatistical three-dimensional modeling of a non-marine sandstone reservoir: A case study from the Paleocene Funing Formation of the Gaoji Oilfield, east China", Open Geosciences, vol. 10, no. 1, pp. 113-120, 2018. https://doi.org/10.1515/geo-2018-0009
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