| In recent years,the oil and gas exploration of Carboniferous in Northwest China has made important breakthroughs in Junggar Basin,Tarim Basin,Turpan-Hami Basin,Balikun Basin and Santanghu Basin,showing a good prospect of exploration.The Wuwei basin is located in the east of the Hexi Corridor,with an area of about 27500km~2.Geological investigation and drilling indicate that the source rocks of Carboniferous in Wuwei Basin have better hydrocarbon generation conditions,and the basin has the resource base of forming conventional gas,tight sandstone gas and shale gas,and has a good prospect of oil and gas exploration.But the whole exploration of Wuwei basin is very low.From the data of the working area,the SNR of the middle and deep layer data is low,the characteristics of the wave group are chaotic,the structure is difficult to carry out,and the interlayer strata can not be traced.Especially the Carboniferous strata reflection information is not continuous and the resolution is low,which can not meet the needs of exploration.Aiming at these problems,taking the Carboniferous as the main target layer,aiming at the design of geometry,the selection of seismic excitation conditions,noise suppression,quality monitoring and control,the best geometry can be maximized.Improve the quality of data collection.By means of the basic parameter demonstration and forward modeling of the geometry,the 2-D wide-line geometry suitable for the survey stage of Wuwei Basin is found out.Through systematic experiment and low frequency signal design,the high frequency distortion of loose surface in desert is studied.The best excitation parameters and the quality of raw data are ensured.The investigation and suppression methods of various noise types affecting acquisition are investigated and analyzed,and a low noise acquisition method and a compound multi-domain denoising technique are proposed,and a new monitoring mode of vibroseis and single shot quality is explored,and the data quality has been greatly improved. |
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