关键词: 塔里木盆地, 沙漠区, 地震波能量, 激发, 接收, 去噪, 信噪比, 分辨率, 一体化

Abstract: Covered by NE-SW banded sand layers, the earth's surface of Tazhong desert area features in high topographic inequality and tremendous changes in the thickness of loose sand layers, which makes it difficult to acquire, process, and interpret the seismic data. Based on united scientific research on the down spread of energy excited by seismic wave and the reception of reflection wave, complete excitation is realized under groundwater level, as well as the optimized observation system for detectors is embedded as low as possible to adapt to local conditions. Due to the difficulties in fulfilling low amplitude structures and thin reservoir traps of Carboniferous and Silurian systems in the area, weak reflections, low signal-to-noise ratio, and difficult stack imaging of the Ordovician seismic data, systematic techniques are studied, developed, and applied, including the technique of analysis and compensation for seismic wave dissipation in dunes, surface-consistent processing technique, multi-domain iterative static correction technique, the technique for establishing fine velocity field model, migration and imaging techniques. Therefore, the seismic data of the area are greatly perfected, as well as the dominant frequencies of Carboniferous, Silurian, and Ordovician seismic profiles in the medium-deep strata rise to 36~40Hz from 18~20Hz. Furthermore, technique series of exploration for oil and gas in Tazhong desert area are developed, Tazhong Band I being given detailed description, oil and gas exploration targets being set. So there is another new climax on exploration for oil and gas in the platform-basin region.

Key words: Tarim Basin, desert area, seismic wave energy, excitation, reception, noise elimination, signal-to-noise ratio, resolution, integration