Classification of Ambient Noises and Operational Countermeasures for Offshore Cross-well Seismic Acquisition in an Oil Area of Bohai Sea

Offshore drilling and completion operations and the operation of heavy equipment in the well site will produce various types of strong noise, which often leads to the failure of cross-well seismic data acquisition due to the low signal-to-noise ratio. As a result, the seismic data needs to be re-acquired, and that obviously affects the operation efficiency. Using the data collected in the early stage of cross-well seismic in an oil region of Bohai Sea, and combining with the drilling and completion operation and heavy equipment operation performance, the paper analyzes the ways and characteristics of different noise generation. According to the noise intensity, regularity, processing difficulty and the impact on data quality, the operation environment is divided into four grades: A, B, C and D, and corresponding countermeasures are formulated for different levels of environmental noise. Therefore, the subsequent data acquisition operations can effectively avoid the noise, increase the signal-to-noise ratio of data and improve the efficiency of the operation.