Estimation of shear sonic logs in the heterogeneous and fractured Lower Cretaceous of the Danish North Sea using supervised learning
| العنوان: | Estimation of shear sonic logs in the heterogeneous and fractured Lower Cretaceous of the Danish North Sea using supervised learning |
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| المؤلفون: | Mads Christian Lund Lorentzen, Kenneth Bredesen, Lars Nielsen, Klaus Mosegaard |
| المصدر: | Lorentzen, M, Bredesen, K, Mosegaard, K & Nielsen, L 2022, ' Estimation of shear sonic logs in the heterogeneous and fractured Lower Cretaceous of the Danish North Sea using supervised learning ', Geophysical Prospecting, vol. 70, no. 8, pp. 1410-1431 . https://doi.org/10.1111/1365-2478.13252 |
| بيانات النشر: | Wiley, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | borehole geophysics, EXAMPLE, PREDICTION, DIAGENESIS, modelling, WAVE VELOCITY, CHALK, Geophysics, Geochemistry and Petrology, RESERVOIR, rock physics, FIELD, data processing, interpretation |
| الوصف: | Shear wave velocity information is valuable in many aspects of seismic exploration and characterization of reservoirs. However, shear wave logs are not always available in the interval of interest due to cost and time-saving purposes. In this study, we present a tailored supervised learning approach to estimate shear wave velocity from well-log measurements in the Lower Cretaceous succession of the Valdemar and Boje fields in the Danish North Sea. Our objective is to investigate the performance of four supervised learning regression models (linear, random forest, support vector and multi-layer perceptron). A limited well-log data set from six wells is used for training and testing the supervised learning models. A set of well data containing normalized gamma ray, compressional wave velocity, neutron porosity and medium resistivity logs gave reasonable shear wave velocity estimates in the test wells with root-mean-square error scores within the range of other published studies. Based on limited input data and complex geology, the multi-layer perceptron was the most successful model in predicting the reservoir sections of the test wells. However, all models lacked stability in the overburden zones. Lastly, re-training the multi-layer perceptron on the six wells to predict missing shear wave velocity in a nearby well showed promising results for further reservoir characterization. The obtained results can yield useful input into, for example, seismic pre-stack inversion, amplitude versus offset analysis and rock physics analysis. |
| وصف الملف: | application/pdf |
| تدمد: | 1365-2478 0016-8025 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dd40f56d2aa8c31a3bbf18ff2df6bc5 https://doi.org/10.1111/1365-2478.13252 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....0dd40f56d2aa8c31a3bbf18ff2df6bc5 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652478 00168025 |
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