Abstract

In the Gulf of Mexico (GoM), loop and eddy currents can cause large errors in 4D shot and receiver locations between baseline and repeat streamer surveys, which invariably lead to poor data quality. In a recent 4D acquisition, a dual-vessel 3D acquisition method addressed the repeatability problem and showed reliable time-lapse measurements over Holstein Field. The time-lapse seismic data show time shifts up to 6 ms over depleting sands and amplitude changes over swept and compacted sands. This 4D information has improved understanding of the field and can support optimal placement of injection and production wells.

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