Application And Research Of Full Digital Seismic Acquisition Technology In Sulige Area

Based on full digital seismic exploration technology, the digital geophone system is employed, as well as digital signals exported from digital geophones are digitally transmitted into key stations for arrangement and storage. At last, the digital signals are processed by using the technology of digital combination and superposition and reprocessed in data processing centers. As the same with the conventional seismic acquisition system, full digital acquisition takes several aspects which include fine investigation of near-surface, conditions of shots explosion based on dynamic characteristics, data received in wide spectrum and so on into consideration. Compared to the conventional technology, the new one improves the capability for resisting electromagnetic interference in transmitting signals and at the same time enhances the instantaneous dynamic range of signals, broadening frequency bands of signals, and is favorable for improving the signal-noise ratio and resolution of seismic data.Among the main gas-contained object layers in Sulige gas field, the reservoirs vary severely laterally and the thickness is thin, which leads to huge risks of drilling. Based on geological and geophysical characteristic analysis of reservoir, this paper has done some application research of full digital seismic acquisition technology on Shan-179well area in Sulige, which mainly focus on geometry design technique aimed to reservoir prediction by pre-stack seismic data, conditions of shots explosion design technique point by point, digital geophone acquisition technique. And we have drew some conclusions:(1) Full digital acquisition is suitable in desert area where the thickness of unconsolidated layers is thinner than40meters and the dry sand on near-surface is thinner than15meters.(2) Noise removal and combined traces processing technique should be taken account in trace interval design which is suitable for the trait of SNR in object area. According to the economic condition, the trace interval should be as narrow as possible.(3) The maximum offset should be long enough to ensure that obvious AVO anomaly and adequate reservoir anisotropic information are recorded.(4) In the condition of high SNR data, there are advantages of wide dynamic range, wide spectrum, high reservation of low frequency information and wonderful wavelet in implicit oil exploration.(5) Good conditions of shots explosion is the key to guarantee the data quality.