对于构造复杂地区，该法往往失效。

But for the complex structure, it is not satisfactory.

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结果表明：叠前时间偏移技术能够有效地提高构造复杂地区煤层的成像效果，提高煤田地震资料的信噪比和分辨率。

The results demonstrated that this technology can improve imaging of coal seams in structure complicated areas and coalfield seismic data signal-to-noise performance and resolution effectively.

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这个项目的主要困难是这个地区的地质构造的非常复杂。

The main difficulty with the project is that the geological structure of the area is very complicated.

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