TY - JOUR ID - 120466 TI - Shear wave velocity estimation utilizing statistical and multi-intelligent models from petrophysical data in a mixed carbonate-siliciclastic reservoir, SW Iran JO - Iranian Journal of Oil and Gas Science and Technology JA - IJOGST LA - en SN - 2345-2412 AU - Hosseini, Ziba AU - Gharechelou, Sajjad AU - Mahboubi, Asadollah AU - Moussavi-Harami, Reza AU - Kadkhodaie-Ilkhchi, Ali AU - Zeinali, Mohsen AD - PH.D. Candidate, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran AD - PH.D. Candidate, Department of Geology, Faculty of Science, University of Tehran, Tehran, Iran AD - Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran AD - Associate Professor, Earth Science Department, Faculty of Natural Science, University of Tabriz, Iran AD - M.s. Student, Petrophysics Department, Iranian Central Oilfield Company, Tehran, Iran Y1 - 2021 PY - 2021 VL - 10 IS - 1 SP - 15 EP - 39 KW - Reservoir rock properties KW - shear wave velocity (Vs) KW - Artificial intelligent multi-model KW - Elastic properties KW - Asmari Formation DO - 10.22050/ijogst.2020.241095.1556 N2 - The conjugation of two or more Artificial Intelligent (AI) models used to design a single model that has increased in popularity over the recent years for exploration of hydrocarbon reservoirs. In this research, we have successfully predicted shear wave velocity (Vs) with higher accuracy through the integration of statistical and AI models using petrophysical data in a mixed carbonate-siliciclastic heterogeneous reservoir. In the designed code for multi-model, first Multivariate Linear Regression (MLR) is used to select the more relevant input variables from petrophysical data using weight coefficients of a suggested function. The most influential petrophysical data (Vp, NPHI, RHOB) are passed to Ant colony optimization (ACOR) for training and establishing initial connection weights and biases of back propagation (BP) algorithm. Afterward, BP training algorithm is applied for final weights and acceptable prediction of shear wave velocity. This novel methodology is illustrated by using a case study from the mixed carbonate-siliciclastic reservoir from one of the Iranian oilfields. Results show that the proposed integrated modeling can sufficiently improve the performance of Vs estimation, and is a method applicable to mixed heterogeneous intervals with complicated diagenetic overprints. Furthermore, predicted Vs from this model is well correlated with lithology, facies and diagenesis variations in the formation. Meanwhile, the developed AI multi-model can serve as an effective approach for estimation of rock elastic properties. More accurate prediction of rock elastic properties in several wells could reduce uncertainty of exploration and save plenty of time and cost for oil industries. UR - https://ijogst.put.ac.ir/article_120466.html L1 - https://ijogst.put.ac.ir/article_120466_f487a1c503d3ad1e5209ef67c466c1b5.pdf ER -