Minimising the effects of obstacles on 2D seismic lines

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ABSTRACT The design of 3D seismic surveys continues to develop, but there have been few innovations in the design of 2D seismic surveys, despite their continued widespread use. In particular, the development of an approach to handling obstacles that may occur along the line, either requiring the line direction to be reoriented or small deviations applied. In this paper, I develop both an approach for determining the bend radius required when 2D lines require curves and compare strategies for dealing with small deviations. For the latter, the best approach is to move the source and receiver positions as close to the edge of the obstacle as possible with them placed on the same side. Irrespective of the approach employed, given the variation in the results shown here, the interpretation of 2D lines should always incorporate the acquisition geometry to ensure that misinterpretations are avoided.