Prediction of interface of geological formations using generalized additive model

Xiaohui Qi, Zhiyong Yang*, Jian Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Geological information such as geological interfaces is important for the design of underground excavation and supporting measures. This in turn requires a method to predict accurately the locations of geological interfaces for the gap areas between boreholes. This study presents a generalized additive model (GAM) to predict the location of the geological interfaces. The performance of the GAM method is evaluated using both simulated data and borehole data for the determination of rockhead in two different geological formations in Singapore. The results show that the GAM method can provide a reasonable confidence interval (CI) of the mean trend and the prediction interval (PI) in the sense that the 95% CI covers about 95% of the actual mean curve while the 95% PI covers around 95% of testing data. Furthermore, the geological complexity can be well reflected as the prediction uncertainty in the geologically complex area is larger than that in the geologically regular area. More importantly, the users can impose prior information or personal judgment regarding the shape of the geological profile on the model. This is an important feature to enable further improvement in the accuracy of the prediction.

Original languageEnglish
Pages (from-to)127-139
Number of pages13
JournalGeorisk
Volume16
Issue number1
Early online date18 Jan 2022
DOIs
Publication statusPublished - Jan 2022

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