东海八角亭构造的三维地震勘探

A 3-D SEISMIC SURVEY OVER BAJIAOTING STRUCTURE IN EAST CHINA SEA

东海八角亭构造位于上海市东南大约400千米处,1987年对它进行了三维地震勘探,勘探面积55.6平方千米,测线距50米。我们采用动态而元,子波处理、DMO、Q/T补偿、智能插值、二步法偏移等方法作资料处理,取得了一套高质量、高分辨率的三维地震数据体。资料解释在人机联作系统上进行,并采用空变速度作图。本次三维地震调查,横向和垂向分辨率大有改善,查清了八角亭构造的形态和本区断裂系统的展布,解决了过去二维地震解释中的各种疑难问题,提交了一套精确的地震构造图件,地质效果十分显著。

The Bajiaoting structure in East China Sea is about 400 kilometers southeast of Shanghai City, over which a 3-D seismic survey covering an area of 55.6 square kilometers was conducted in 1978 with 50 meters line spacing. In data processing, a number of techniques, such as dynamic binning, wavelet processing, DMO, Q/T compensation, intelligent interpolation, and the two-pass migration were used and a high resolution 3-D data volume with exceptional quality was finally obtained. The data interpretation was performed on an interactive interpretation workstation and the spatial variation of velocities has been taken into consideration in mapping the results. This 3-D seismic survey yielded great improvements in both lateral and vertical resolution delineating the Bajiaoting structure and the fault systems in the prospecting area. As a result, problems which are unable to be settled with 2-D seismic surveys in the past have now been satisfactorily resolved. The geologic effects of this survey are prominent as can be seen from the resulting accurate seismic structural maps.