复杂地区近地表速度调查中的电阻率方法  

Resistivity method to near-surface velocity imaging in complex area

作　　者：肖鹏飞[1,2] 孙开峰[1] 曲寿利[3] 曹辉[1] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所,江苏南京210014 [2]浙江大学理学院,浙江杭州310027 [3]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《勘探地球物理进展》2008年第5期352-356,377,共6页Progress in Exploration Geophysics

摘　　要：电阻率法在近地表调查工作中发挥着较大的作用,该方法可以进行表层结果调查和初步的速度成像工作。南方碳酸盐岩地区地表结构复杂,采用常规的电阻率法表层速度成像得到的结果不仅与微测井解释结果相差很大,也与实际岩石速度分布不符。为了提高南方地区电阻率法的成像精度和稳定性,需要进行如下改进:首先对岩性进行分析,得到各岩石的参数;其次,利用该参数,通过引入自适应加权广义算法,进行速度成像。通过与微测井剖面的详细对比分析,该方法具有较好的效果。Electromagnetic method plays an important role in investigation of near surface structure. The methods are used not only in investigation of near surface structure, but also in velocity imaging. Because of the complexity of near surface structure in the carbonate zone in southern China, the velocity distribution from conventional resistivity method is quite different from that from uphole method and the actual velocity distribution. To cope with this problem, we proposed the following measures: firstly perform lithological analysis to generate parameter β, and then carry out velocity imaging with the parameter and the adaptive weighted generalized algorithm. The proposed method yield desired results as show from the comparison with that from uphole method.

关 键 词：低降速带 电阻率法 速度成像 岩性分析 

分 类 号：P631.322[天文地球—地质矿产勘探]