2D & Cross-Spread Mini-3D Surveys for Geothermal Doublet Planning in The Netherlands

We present the results of two small target-oriented sparse seismic surveys for planning and optimising geothermal doublets. These surveys combine short conventional 2D seismic lines with 3D cross-spreads formed by orthogonal 2D lines, to obtain a reliable areal image of the subsurface in a limited area-of-interest. Data were acquired using low-power electromagnetic vibrators and nodal sensors which made seismic acquisition in this mixed urban-industrial-agricultural area possible. Despite the high ambient noise levels, low source energy and restricted access, the data successfully imaged subsurface targets at 2000m–2500m bmsl and provided the operator with useful additional subsurface information, particularly on small faults and fault patterns in the development blocks.