The Research Of High Effective Seismic Acquisition Technique Of The Vibroseis In The Northern Margin Of Junggar Basin

The construction of vibroseis is a kind of "safety,environmental protection,high quality,economy and high efficiency" seismic acquisition method.At present,the global terrestrial vibroseis acquisition method more and more attention is paid to the oil companies,especially in high density to improve the construction efficiency based on the high quality of vibroseis seismic prospecting technology,showing a rapid development trend of strong in the world.The Gobi gravel area in the northern margin of the Junggar basin,the thickness of low velocity layer is big,drilling is difficult,so it is suitable for the use of the vibrator shot.Compared to the source of the dynamitic in the gravel area,the correlation calculation of the vibrator source is very effective to suppress the frequency of the sweeping frequency,and suppress the low frequency surface wave better than the dynamitic sorce.The overall advantage mainly in the following aspects:(1)Construction of vibroseis is more safe and environmental protection.;(2)Controlled source output force can be adjusted,frequency control,flexible combination,can be highly effective shot;(3)Construction organization is flexible,from the point of view of data quality,the acquisition cost of vibrators is lower than that of dynamitic source,and it is the base of realizing high density acquisition.According to the research of the project,the variable slip-sweep of the geological target is realized,which can ensure the quality of the data and improve the production efficiency.;The sweep signal design technology of the vibroseis based on the frequency response of the target is developed,which can improve the quality of the vibroseis construction,and the fast real-time quality control technology of the vibroseis data acquisition is improved and the number of shots is more than 10000 everyday.In the application of Piedmont belt of the northwestern margin of Junggar Basin,for the first time in the domestic similar areas to achieve the highest production efficiency.According to the geological effect,the imaging effect of the target area is greatly improved,the structure of the contact relation and the structure is more clear,and the pre-stack depth migration structure is more reasonable,especially the steep dip structure imaging has a significant improvement.