层析法在黄土塬区近地表结构调查中的应用

我国西部黄土塬区的静校正问题十分突出，精细、准确的近地表结构调查对于解决激发井深的设计和静校正问题尤为重要，但该区的常规小折射解释精度极低，微测井难以追踪到高速层。在充分试验的基础上，提出了一种新的近地表结构调查方法——层析近地表结构调查法，该方法有效解决了上述难点，与常规小折射方法比较，该方法获取的近地表结构信息更丰富，刻画的近地表结构更为精细，能够较好地用于井深设计和静校正处理中初始模型的建立。

THE APPLICATION OF CHROMATOGRAPHY TECHNOLOGY TO NEAR-SURFACE STRUCTURE INVESTIGATION OF THE LOESS AREA

In western China’s loess area,the static correction problem is very prominent.Fine,accurate near-surface structure survey is very important for solving the problems of excitation well depth design and static correction.However,on the one hand,the terrain is very complex,resulting in extremely low conventional rolling refraction interpretation accuracy;On the other hand,it’s very difficult to trace the high-speed layer through the micro logging because of the thick loess coverage.Therefore,the problem as to how to take good shot records and how to do well in the static correction processing has become a major difficulty in seismic exploration of these regions.The authors proposed a new method for near-surface structure survey on the basis of full test,i.e.,the chromatography method,which can effectively solve the difficulty.A comparison with the conventional refraction method shows that this method can obtain richer information and depict more finely the near-surface structure.Therefore,it can be used fairly well in such aspects as the well depth design and the establishment of the initial model for static correction processing.