油泉子地区表层结构调查方法

柴达木盆地油泉子地区因地表干燥层巨厚,低降速带厚度大,使用常规浅层调查方法难以确定合适的激发层位。针对上述问题在本区开展了录井岩样含水量调查、电测井及高密度电阻率法等研究工作,以配合地震微测井工作。通过采用上述方法对两条相交试验测线的表层结构开展联合调查,结果发现在地表以下35m深度范围内仍然可以找到1-2个井段为高含水量及低电阻率值部位,适宜地震勘探激发。这套表层联合调查方法为地震与非地震方法结合提供了一条新途径。

Experimental Effects of Shallow Survey in Youquanzi Area

It is difficult to make certain of suitable shooting layers by ordinary shallow survey methods in Youquanzi area of Qiadam basin because of significant thickness of dry layer on the surface and thick low velocity layers (LVL). In view of abovemen-tioned problems and to match the seismic uphole survey,the study of surveying moisture content in logging core samples,electric logging and high density resistivity method were carried out. The joint surveys for surface structure of two experimental cross lines were implemented by using abovemen-tioned methods, which discovered that 1~2 well parts characterized by high moisture content and low resistivity within the scope of 35 m deep below surface could be still found out, which is suitable for seismic shooting. This set of joint survey method for surveying the subsurface provides a new tool for combination of non-seismic and seismic methods.