| In this paper, first of all, it used the techniques of seismic merging processing in processing of the Aman seismic data, which contains the uniform merging static correction, optimization of prestack noise attenuation, amplitude preservation processing, wavelet consistent processing and other technical measures that has improved the signal-to-noise ratio of the data and achieved high quality section. Meanwhile, the application of the fine velocity analysis have improved the quality of seismic imaging and the accuracy of the breakpoint location. On this basis, it made full use of the existing research results, using the seismic and geological calibration field building technology, fine velocity technique, forward modeling, seismic inversion technique, detailed studied the top surface and the fracture of the Silurian Kalpintag Formation and accurately depicted the fault characteristics and fault distribution, selected the perspective and target area. This paper has made the following conclusion:(1) In the seismic data processing, it used the targeted technique to obtain the higher quality data. First, the uniform merging static correction solve the problem of datum static correction and the residual static correction eliminate the residual moveout, which have achieved good results. Second, combine various methods to denoise, gradually remove the noise to enhance the signal-to-noise ratio of the seismic section. Third, optimize the gathers, fine analyse the velocity and remove the noise to improve stack and migration imaging accuracy. Fourth, use the bending ray prestack time migration to make the diffracted wave convergence, reflection positioning reasonable and improve the imaging accuracy.(2) The signal-to-noise ratio of the seismic data has been significantly improved,. The signs of the formation in the shallow, middle and deep were clear, amplitude preservation was better than the old seismic data and the band has been widened. The geological phenomena of each layer is abundant, top-down clearly reflects the geological deposition.(3) Igneous rock and faults in Aman area are very developed, the relations of the fracture are complicated. A series of measures were taken in the process of interpretation, to guide the project research work. Making full use of drilling geological data, vsp data and log data to launch the fine calibration of seismic reflection horizon and reservoir from top to bottom and fine interpretation of seismic reflection layers as speed control layers. The application of the layer control method has established a fine velocity field in Aman area. Meanwhile, use the inversion of the seismic wave impedance on the main targeted layers to predict the reservoir in Aman area and the inversion of velocity to research the velocity of Permian igneous rock.(4) Permian volcano activity is more intense in Aman area, so the fault system is complex. Because the development of the fault is affected by the eruption central volcano rock, the fracture is mainly related to igneous rocks fracture. The fault strike in the targeted area is near NE-SW, local main trend NE-SW direction. At the same time, controlled by the Permian volcano eruption center, the small ring fracture is developed, which basic control most low-amplitude trap in Aman area.(5) The sandstone formation in the Upper Member of the Silurian Kalpintag Formation in Aman area is the northwest dipping slope, which developed a series of low-amplitude trap controlled by the faults. Aman 4 structure is located in the area of northern rhyolite eruption center and is a anticline controlled by fault and developed in the slope. The trap exists in the Upper Member of the Carboniferous Donghe sandstone and the Silurian Kalpintag Formation. Aman 4 structure is a autogenetic trap controlled by the fracture. By the comprehensive analysis, we infer that Aman 4 structure trap is most advantageous and the more reliable exploration target. |
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