Efficient selective attention LSTM for well log curve synthesis

Non-core drilling has gradually become the primary exploration method in geological engineering, and well logging curves have increasingly gained importance as the main carriers of geological information. However, factors such as geological environment, logging equipment, borehole quality, and unexpected events can all impact the quality of well logging curves. Previous methods of re-logging or manual corrections have been associated with high costs and low efficiency. This paper proposes a machine learning method that utilizes existing data to predict missing well logging curves, and its effectiveness and feasibility have been validated through experiments. The proposed method builds upon the traditional Long Short-Term Memory (LSTM) neural network by incorporating a self-attention mechanism to analyze the spatial dependencies of the data. It selectively includes the dominant computational results in the LSTM, reducing the computational complexity from O(n^2) to O(nlogn) and improving model efficiency. Experimental results demonstrate that the proposed method achieves higher accuracy compared to traditional curve synthesis methods based on Fully Connected Neural Networks (FCNN) and LSTM. This accurate, efficient, and cost-effective prediction method holds practical value in engineering applications.