Abstract:

Towed streamer seismic acquisition is used in the traditional marine seismic exploration，and the signal-to-noise
ratio of the collected data are greatly influenced by external environment. The influence of environment on seismic data can be
reduced by changing the depth of the streamer. It´s difficult to collect broad-seis data in China sea due to the limitations of seismic
equipment. In order to break the limitation，a combined broad-seis survey of streamer and ocean bottom cable（OBC）was
discussed in the article. There are four key techniques in survey design，including parameter argumentation，bin combined，
feather angle and depth optimization. In parameter argumentation the method to compute line spaces through the most shallow
purpose layer is discussed. For the space differences between towing and submarine cable detector，bin combined method
was designed. In the situation of feather angle existence，we discussed the effect of horizontal change rate on limited wave
point frequency and energy in data collection. In the end，we discussed the optimization of sinking depth of towing through
depth changing test. Through analysis of these techniques，we have established the basic process of survey design of combined
broad-seis acquisition of streamer and OBC.

Key words: broad-seis, ghost, ocean bottom cable（OBC）, hydrophone, array