Study On Seismic Exploration Field Acquisition Method In Complicated Piedmont Zone Of Hetian In Sangzhu

As laying more and more emphasis on the position of hydrocarbon-assemblation in fore-mountain belt, the oil technology accelerated the seismic exploration. However, the seismic exploration of fore-mountain belt are facing several difficulties. Firstly, in fore-mountain belt the terrain vary intensely, the donga develop here and there, the mountains are very steep and the elevation have a big variation. Secondly, the structure of the surface is very complex and the lithology varies acutely, in such condition the generation and receiving of seismic wave is very difficult. Thirdly, not the traffic here is inconvenient, but the climate is bad and the source of water is lacking. Fourthly, all of the quality of the seismic data here is very bad, behaving as the intense noise disturbance, low N/S and resolution etc. Fifthly the shallow horizon in the region of fore-mountain belt develops lots of thrust structure, in the region of the thrust body old horizon was thrusted on the new horizon, which made the seismic wave field be complex and imaging of the reflective wave be difficult. Sixthly, the wave field of high steep structure is complex and the imaging of the reflective wave is difficult. The region of Sangzhu in Hetian ,which is in Tabet basin is this type of region. Through research, we use the method of array-receiving, array-shooting and stack response to attenuate noise. According to the frequency component we need to protect, we can choose appropriate array distance to attenuate the noise from direction of inline, At the same time, we can make it possible to attenuate noise of all frequency component from the direction of crossline. As to different geology structure, Through the thought of using variable trace interval, shot interval and fold, we can apply large offset and high multiplicity according to low frequency geometry to acquire high quality seismic data.