Abstract: High risks and high costs of deep-target drilling make the prediction role of deep seismic prospecting very important. In view of issues such as long travel distance and complicated travel routes of seismic waves, weak energy of effective signals and severe loss of high frequency reflection signals, complex geological conditions and high requirements on acquisition accuracy in deep formation seismic survey, we have come up with the acquisition technical idea of “facing target, oriented to processing, and making use of low frequency data”, and divided the deep targets into 2 groups, complicated structure targets (CST) and complicated reservoir targets (CRT) to investigate accordingly. The first and foremost mission in studying CST is raising the signal to noise ratio of the seismic data. Wide-line large-array 2D acquisition has solved the problem firstly, and contributed to the continuous breakthroughs of deep sub-salt structure exploration in Kuqa thrust-belt of Tarim basin. The key point in studying CRT is enhancing overall seismic data precision, "WBH" (wide azimuth, broad band and high density) 3D acquisition is the inevitable choice for this issue, which has facilitated the rapid evaluation and productivity construction of the deep karst reservoirs in Halahatang area, Tabei uplift. In summary of the requirements in both deep geological research and high-precision processing, it is concluded that "making full use of low frequency data" will become the direction of deep formation seismic exploration in the near future.

Key words: seismic acquisition, deep exploration, complicated structure, complicated reservoir, low frequency