RESEARCH MADE ON SEISMIC DATA ACQUISITIOPN TECHNOLOGY AND APPLICATION FOR EXTREMELY THICK LOESS

Oil/gas exploration in the areas covered with extremely thick loess is constrained with low signal-to-noise ratio of the seismic data,and no breakthrough has been made for many years.The thick loess area in southwest Tarim is a typical example,influenced by both extremely thick loess and complex subsurface structure,the shooting and receiving conditions are poor,signal-to-noise ratio of raw shot records is very low,and the imaging quality of the seismic sections is very poor,so,the seismic sections can't meet the requirements for structural interpretation and reservoir prediction.Citing the research on wide-line survey,long geophone array receiving,source array and the necessary acquisition techniques for the extremely thick loess areas in the southwest Tarim,through near surface structure investigation,test and analysis on shooting/receiving parameters and folds,the paper puts forward the reasonable acquisition technical scheme and the necessary measures,acquired seismic data with relatively high signal-to-noise ratio,which can meet the requirements of geological interpretation.And moreover,the paper has summatized and developed a set of effective necessary technologies for seismic acquisition in the mountainous regions covered with extremely thick loess.