Seismic Acquisition Technology In Ruoqiang Structure Of Southeast Tarim Area

With the deepening of the Tarim Basin exploration, work area is more and more complex. Ruoqiang structure locates at the south-east edge of Tarim Basin where the terrain is extremely complex,for surface mainly with Quaternary gravel, structure loosening,gully development,poor sorting, many interlayered surface structures,the developed secondary irregular interference such as scattering ,the bad conditions of stimulating and receiving and low signal to noise ratio data,which leads to ascertain structure difficultly. It is hard to obtain a good seismic data in the low signal to noise ratio and complex work area by the conventional two-dimensional seismic acquisition method.On the basis of a careful analysis of the characteristics and the old data, carries on the innovation attempt in the gathering method. To further ascertain the structure Ruoqiang 1 by studying the acquisition technique in research area, and at the same time to develop new seismic acquisition methods and ideas for the Southeastern Tarim and low signal to noise ratio areas. Regarding Ruoqiang structure, we should select different structure locations to extract the geophysical parameters, because the local subsurface structures change big. Then according to geophysics parameter, using the Klseis proof software to theoretically prove and analyse the group interval and the biggest geophone offset. Mainly determined small group interval and high coverage,the acquisition design that is big horizontal combination of seismic origin and geophone, to enhance the signal-to-noise ratio on longitudinal through increasing the number of coverage for interference suppression and to suppress effectively the lateral interference and scattering interference by the big combination on horizontal.On the aspect of field static correction, because the former surface investigation in research area basically by small refraction and the refracted wave principle is not suitable in this area, the accuracy of investigation will be tremendously influenced. In view of the question of former surface layer investigation, we increased the investment on surface layer investigation and mainly used the high accuracy microlog method. The seismic data quality is markedly improved integrated the selected parameters before.Adopt a series of targeted technical such as static correction, prestack noise attenuation techniques, oscillation amplitude processing, deconvolution and fine image formation in seismic data processing, which improve the structure image formation, so the structure conformation is clearer.It achieves good results by adopting the acquisition techniques and processing technologies in this area. These technologies can solve the actual production problems and have a better implementation and good serviceability in the southeast Tarim.