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Hybrid 3D VSP Using Fiber-Optic Technology and a Conventional Borehole Seismic Array Tool

Summary Fiber-optic technology, such as distributed acoustic sensing (DAS) and hybrid logging cable, can significantly reduce operating time for obtaining a 3D vertical seismic profile (VSP) survey by combining it with conventional borehole seismic arrays to record high-resolution three-component (3C) images at reservoir depths and valuable time-depth and velocity data with one-component (1C) imaging within the overburden from the fiber optic cable. The first field application of heterodyne distributed vibration sensing (hDVS) DAS acquisition simultaneously recorded data using a 12-shuttle three-component borehole seismic imager tool in a deviated well offshore Qatar to obtain high-resolution 3D VSP seismic imaging and velocity information. Using a hybrid heptacable enabled conducting the traditional 3D VSP survey while extending sensor coverage with 1C measurement from the tool to the surface with minimal additional operation time. The borehole seismic arrays-hDVS system efficiently acquired seismic imaging data over the entire well by covering the entire well with receivers for each seismic source shot. This is a new way of acquiring 3D VSPs.