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

1. 中国地质大学,北京100083;2. 中国石化中原油田物探研究院,河南濮阳 457001;3. 中国石化石油勘探开发研究院南京石油物探研究所,江苏南京 210014;4. 中国石化中原油田地质调查处,河南濮阳 457001

China University of Geosciences, Beijing 100083, China

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 inseismic exploration. In generally, extended shot ar-ray is used to track the refraction layer. Howeverthis method fails to yield satisfactory results in thedesert area of Tarim basin. In this paper, propersurvey method is derived via theoretical analysis andforward modeling. We propose to conduct refractionsurvey with extended spread array, and determinenear surface parameters by the combination of refrac-tion survey and microlog survey.