求翻译：三维地震勘探技术一直被成功地应用于石油、煤炭等中深层勘探领域，对于深度小于100m的浅层三维地震勘探，由于受到多种条件的限制，相关的研究和应用成果还很少。是什么意思？

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3-D Seismic exploration technology has been successfully applied to petroleum, coal, and other deep in the exploration area for depth less than 100m of the shallow three-dimensional Seismic Exploration, due to the wide variety of conditions, the relevant research and the application of the results i

The three dimensional seismic survey technology successfully is always applied in the petroleum, the coal in and so on in-depth exploration domain, is smaller than the 100m shallow layer three dimensional seismic survey regarding the depth, because receives many kinds of conditions the limit, the co

Three dimensional seismic exploration techniques have been successfully used in the oil, coal and other areas of deep exploration, with a depth of less than 100m of shallow seismic prospecting, restricted due to the variety of conditions, related research and application results is limited.

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