An Application Of Great Combination In Ruoqiang Seismic Exploration

As a strategic reserve of oil and gas area in Tarim exploration area, there is rows of structural development and more traps in the southeast area. Ruoqiang structure 2 more favorable than 1 in structural belt of Ruoqiang from structural position, so the implementation of Ruoqiang structure 2 has a very important strategic significance.However, the bottleneck of constraints exploration of Ruoqiang 2 structure was the original seismic data with lower SNR, especially in the south wing. It is urgent need for technical innovation and application of mature technologies to improve the quality of the data area. Great Combination of receiving a large trial in Kuqa achieved good results, but it need further research whether for this area.The reason is various that impact on complex mountainous imaging data, one of the important reasons is noise development problem from complex land surface feature. At present, main interference wave of impact section quality are surface wave close to frequency of significant wave and side wave. Field geophone grouping can made noise blanking, but common combination due to smaller cardinal distance, which made noise blanking of frequency range in significant wave very limited. By analyzing, it is unrealistic and unnecessary that blanking full wavelength of interference wave, because low-frequency interference can be effectively removed through a simple band-pass filter in the data processing, so the focus of detector combination was blanking the interference wave in main band for the effective wave to achieve the purpose of improving SNR of raw data.Great Combination has achieved some effects in gobi area of Ruoqiang region, however, due to its surface is relatively simple, the side profile interfere was not particularly developed, the improvements of profile was modest compared with the conventional combination, which can also meet the implementation piedmont structure requirements; Alkin Mountain area in the past has been the body of a blank area of seismic exploration, information blank area in the past been part of the information by taking great combination this time. Not only because complex surface and conditions of seismic geological subsurface in the mountain area and poor quality of data, but also it difficult to meet the geological interpretation. Due to complex surface and conditions of seismic geological subsurface in Alkin Mountain, the information on mountain areas difficult to image; it is not able to solve seismic exploration problems of Alkin Mountain only depend on Great Combination, wide-line+Great Combination method could be considered for further research to continue the exploration next step.