塔里木盆地沙漠区折射波观测方法分析

Refraction survey in desert areas of Tarim basin.

利用折射波和小折射进行干扰波和表层调查通常采用的是延长炮点的方法来追踪折射层与表层结构,但该方法在塔里木沙漠区的应用存在一些问题,如观测的折射波速度不准确,小折射与微测井测得的表层参数差别大等。从理论和正演模拟着手,并结合实际资料,对复杂地表情况的观测方式进行了分析和探讨,提出了用延长排列的方式进行折射波调查,以及综合小折射与微测井联合观测表层参数。改进后的方法可以有效提高表层调查的精度。

Refraction survey is commonly used in investiga- tion of disturbing waves and near surface structure in seismic exploration. In generally, extended shot ar- ray is used to track the refraction layer. However this method fails to yield satisfactory results in the desert area of Tarim basin. In this paper, proper survey method is derived via theoretical analysis and forward modeling. We propose to conduct refraction survey with extended spread array, and determine near surface parameters by the combination of refrac- tion survey and microlog survey.