不整合面成图方法探讨

Discussion on unconformity interface mapping methods

石油地球物理勘探局地调一处,天津301608

The First Geologic Survey Division, Bureau of Oil Geophysical Prospecting, Tianjin 301608

叙述了不整合面在深度成图过程中存在的问题及相应采取的措施,目的是提高不整合面成图精度。我们叙述了不整合面的几种情况,并重点讨论了测线方向与倾斜层方向不一致时所形成的偏移成像有效波的脱缺量。针对这些问题说明了应如何追踪不整合面和编制、空校t₀图,从而形成准确的深度图。通过对托克逊地区的白垩系的不整合面局部成图分析,给出了传统成图方法存在的误差及新方法的可行性,效果较好。

Problems existing in depth mapping of unconformity interface and corresponding means adopted are narrated here with aims to improve the mapping precision. This paper gives several unconformity circumstances and emphatically discusses the disjunction of migration imaging effective wave formed when the line direction is not consistent with the dip direction. In view of these problems, the paper proposes how to track unconformity surface and produce accurate depth map. Through the local mapping analysis of Crataceous unconformity surface in Tuokexun area, we give the error existing in conventional mapping method. And the results show that the new method is feasible and effective.