Zone Identification and Oil Saturation Prediction in a Waterflooded Field: Residual Oil Zone, East Seminole Field, Texas, USA, Permian Basin
- Jacqueline N. Roueché (Lynxnet LLC, U.S. Geological Survey) | C. Özgen Karacan (U.S. Geological Survey)
- Document ID
- Society of Petroleum Engineers
- SPE Improved Oil Recovery Conference, 14-18 April, Tulsa, Oklahoma, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 7.4.1 Resource Potential and Evaluation, 5 Reservoir Desciption & Dynamics, 5.6 Formation Evaluation & Management, 5.4.1 Waterflooding, 5.4 Improved and Enhanced Recovery, 7.6.6 Artificial Intelligence, 1.6.9 Coring, Fishing, 6.1 HSSE & Social Responsibility Management, 5.4 Improved and Enhanced Recovery, 1.6 Drilling Operations, 6 Health, Safety, Security, Environment and Social Responsibility, 7.4 Energy Economics, 5.6.1 Open hole/cased hole log analysis, 6.1.5 Human Resources, Competence and Training, 7 Management and Information
- Artificial Neural Network, Oil Saturation, East Seminole Field, San Andres, ROZ
- 1 in the last 30 days
- 265 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 28.00|
Recently, the miscible CO2-EOR tertiary process used in the main pay zone (MP) of suitable reservoirs has broadened to include exploitation of the underlying residual oil zone (ROZ) where a significant amount of oil may remain. The objective of this study is to identify the ROZ and to assess the remaining oil in a brownfield ROZ by using core data and conventional well logs with probabilistic and predictive methods.
Core and log data from three wells located in the East Seminole Field in Gaines County, Texas, were used to identify the MP and ROZ in the San Andres Limestone, and to predict oil saturations. The core measurements were used to calculate probabilistic in-situ oil saturations within the MP and the ROZ as a function of depth. Well logs, in combination with core data and calculated saturations, on the other hand, were used to develop two expert systems using artificial neural networks (ANN); one to identify the ROZ and MP, and the other to predict oil saturation. These systems were also supported by a classification and regression tree (CART) analysis to delineate the rules that lead to classifications of zones.
Results showed that expert systems developed and calibrated by combining core and well log data can identify MP and ROZ with a success score of more than 90%. Saturations within these zones can be predicted with a correlation coefficient of around 0.6 for testing and 0.8 for training data. The analyses showed that neutron porosity and density well log readings are the most influential ones to identify zones in this field and to predict oil saturations in the MP and ROZ. To explain the relationships of input data with the results, a rule-based system was also applied, which revealed the underlying petrophysical differences between MP and ROZ.
This new predictive approach using machine learning techniques, could potentially address the challenges that previous studies have come up against in defining the ROZ within the formation and quantifying remaining oil saturations. The method can potentially be applied to additional fields and help reliably identify the ROZ and estimate saturations for future resource evaluations.
|File Size||1 MB||Number of Pages||14|
Bulushi, N., King, P., Blunt, M.. 2009. Development of Artificial Neural Network Models for Predicting Water Saturation and Fluid Distribution. Journal of Petroleum Science and Engineering 68:197-208. http://dx.doi.org/10.1016/j.petrol.2009.06.017.
Hamada, G. M., Almajed, A. A., Okasha, T. M.. 2013. Uncertainty analysis of Archie’s parameters determination techniques in carbonate reservoirs. J Petrol Explor Prod Technol 3:1-10. https://dx.doi.org/10.1007/s13202-012-0042-x.
Harouaka, A., Trentham, B., and Melzer, S. 2013. Long Overlooked Residual Oil Zones (ROZ’s) Are Brought to the Limelight. Presented at the SPE Unconventional Resources Conference-Canada, Calgary, Alberta, Canada, 5-7 November. SPE 167209. http://dx.doi.org/10.2118/167209.
Honarpour, M. M., Nagarajan, N. R., Grijalba, A. C.. 2010. Rock-Fluid Characterization for Miscible CO2 Injection: Residual Oil Zone, Seminole Field, Permian Basin. Presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19-22 September. SPE 133089. http://dx.doi.org/10.218/133089.
Koperna, G. J., Melzer, L. S., and Kuuskraa, V. A. 2006. Recovery of Oil Resources From the Residual and Transitional Oil Zones of the Permian Basin. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 24-27 September. SPE-102972. http://dx.doi.org/10.218/102972.
Korjani, M., Popa, A., Grijalva, E.. 2016. A New Approach to Reservoir Characterization Using Deep Learning Neural Networks. Presented at the SPE Western Regional Meeting, Anchorage, Alaska, USA, 23-26 May. SPE-180359-MS. http://dx.doi.org/10.218/180359-MS.
Pathak, P., Fitz, D., Babcock, K.. 2011. Residual Oil Saturation Determination for EOR Projects in Means Field, a Mature West Texas Carbonate Field. Presented at the SPE Enhanced Oil Recovery Conference, Kuala Lumpur, Malaysia, 19-21 July. SPE 145229. http://dx.doi.org/10.218/145229.
Pickett, G. R. 1966. A Review of Current Techniques for Determination of Water Saturation From Logs. Presented at SPE Rocky Mountain Regional Meeting, Denver, Colorado, USA, 23-24 May. SPE 1446-PA. http://dx.doi.org/10.218/1446-PA.
Sharifi,, H., Saadat, K., Kazemzadeh, E.. 2012. Measurement of Archie Parameters of Some Carbonate Cores at Full Reservoir Conditions. Journal of Chemical and Petroleum Engineering 46 1: 63-72. https://jcpeng.ut.ac.ir/article_1894.html.
Wang, B., Wang, X., and Chen, Z. 2013. A Hybrid Framework for Reservoir Characterization Using Fuzzy Ranking and an Artificial Neural Network. Computers & Geosciences 57: 1-10. http://dx.doi.org/10.1016/j.cageo.2013.03.016.