Seismic 3D Survey Areas - for Petroleum Industry Exploration

The polygons depict the outline of 3D surveys. These outlines illustrate the survey outlines but are not consistently defined. The polygons have been extracted from survey reports but may illustrate surface coverage, full fold coverage or even the final grid definitions. Care should be exercised when using these polygons for anything other than an indication of survey extent.本数据集中的多边形要素用于表征三维勘探（3D surveys）的轮廓范围。此类轮廓仅用于示意勘探范围，并未形成统一的定义标准。该类多边形源自勘探报告，但所表征的范围可能涵盖地表覆盖范围、全褶皱覆盖范围，甚至最终网格定义。除用于示意勘探范围外，若将此类多边形用于其他用途，需谨慎行事。