A Seq2Seq Model Improved by Transcendental Learning and Imaged Sequence Samples for Porosity Prediction

Lijian Zhou (), Lijun Wang, Zhiang Zhao, Yuwei Liu and Xiwu Liu
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Lijian Zhou: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266525, China
Lijun Wang: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266525, China
Zhiang Zhao: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266525, China
Yuwei Liu: SinoPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
Xiwu Liu: SinoPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

Mathematics, 2022, vol. 11, issue 1, 1-23

Abstract: Since the accurate prediction of porosity is one of the critical factors for estimating oil and gas reservoirs, a novel porosity prediction method based on Imaged Sequence Samples (ISS) and a Sequence to Sequence (Seq2Seq) model fused by Transcendental Learning (TL) is proposed using well-logging data. Firstly, to investigate the correlation between logging features and porosity, the original logging features are normalized and selected by computing their correlation with porosity to obtain the point samples. Secondly, to better represent the depositional relations with depths, an ISS set is established by slidingly grouping sample points across depth, and the selected logging features are in a row. Therefore, spatial relations among the features are established along the vertical and horizontal directions. Thirdly, since the Seq2Seq model can better extract the spatio-temporal information of the input data than the Bidirectional Gate Recurrent Unit (BGRU), the Seq2Seq model is introduced for the first time to address the logging data and predict porosity. The experimental results show that it can achieve superior prediction results than state-of-the-art. However, the cumulative bias is likely to appear when using the Seq2Seq model. Motivated by teacher forcing, the idea of TL is proposed to be incorporated into the decoding process of Seq2Seq, named the TL-Seq2Seq model. The self-well and inter-well experimental results show that the proposed approach can significantly improve the accuracy of porosity prediction.

Keywords: porosity prediction; deep learning; transcendental learning; imaged sequence samples; logging data (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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