古垂线法平衡地震剖面研究

Research on seismic cross section balance using palaeo-vertical method

古垂线是变形剖面上的一条曲线，是未变形剖面上的垂直线经变形后的产物。古垂线算法是根据地层和断层的几何形态，计算一簇被用来恢复剖面的古垂线。其关键是地层形变机制的确定，而形变机制的假设可概括为古垂线要点。文中给出了基本古垂线要点和改进的古垂线要点。恢复的地震道是由又形地震造的振幅向下沿古垂线重采样所得。作者根据古垂线法原理研制了相应的计算机软件，并利用此软件对实际地震资料进行了平衡地震剖面处理。

Palaeo-vertical becomes a curve in deformed cross section, this is because thevertical in an original cross section was deformed. In the light of the geometry ofstratum and fault,palaeo-vertical method offers a family of palaeo-verticals whichare used to resume a cross section. Its key lies in the determination of deforrnationmechanism. The presumption of deforrnation rnechanism can be considered as the es-sential of palaeo-vertical. The paper sketches basic and improved palaeo-vertical es-sentials. Resumed seismic trace is obtained by downward resampling the amplitudesof a deformed seismic trace along the palaeo-vertical. On the basis of the principle ofpalaeo vertical method, the authors have deveIoped the corresponding softwares,which have been applied to section balance processing of real seismic data.