ABSTRACT

Shallow gas in ground water geological layers is of great danger for drilling rigs in the case of accidental opening of gas deposits. The gas may rise towards the water surface, and its emission into the atmosphere may threaten the environment. It is very important to forecast the gas emissions in order to prevent catastrophic destruction of drilling rigs and loss of human lives. This paper presents the results of numerical simulations of seismic wave propagation towards the water surface in models with gas deposits in a layered soil for the 3D case. The modeling is carried out for a 4-year period for layers located at a depth of 1000 m from the sea bottom. The calculation results (wave patterns and seismograms) show that the gas may approach the water surface in the 4th year of the calculations. The results for a 3D problem are in agreement with those for a 2D problem obtained by the authors earlier. This is very important, since the calculations can be greatly simplified.

中文翻译：

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气穴地质介质中弹性波传播的网格特征数值模拟

摘要

在意外打开气藏的情况下，地下水地质层中的浅层气体对钻机具有极大的危险。气体可能会向水面上升，并且其向大气中的排放可能会威胁环境。预测气体排放量对于防止钻机的灾难性破坏和人员伤亡非常重要。本文介绍了在3D情况下在层状土壤中有气体沉积的模型中地震波向水面传播的数值模拟结果。对距海底1000 m深度的各层进行了为期4年的建模。计算结果（波形和地震图）表明，在计算的第4年中，气体可能接近水面。3D问题的结果与作者先前获得的2D问题的结果一致。这是非常重要的，因为可以大大简化计算。