井地电位法中变物性参数异常响应的模拟与分析  

MODELING AND ANALYSIS FOR ABNORMAL RESPONSE ON VARIABLE PHYSICAL PARAMETERS BY BOREHOLE-GROUND DC METHOD

作　　者：马捷[1] 冯德山[1] 刘海飞[1] 陈德鹏[1] 

机构地区：[1]中南大学信息物理工程学院,湖南长沙410013

出　　处：《物探化探计算技术》2010年第1期1-5,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(40804027);湖南省自然基金重点项目(09JJ3084);教育部博士点新教师基金资助项目(200805331082);湖南省科技计划项目(2008TP4013-2)

摘　　要：为了研究地下异常体几何及物性参数变化对井地电位法地表响应的影响规律,对垂直线源激励下的变物性参数地下异常体,采用三维有限单元法进行了正演模拟。经模拟结果表明,在浅部时异常形态清晰,随深度的增加,异常响应的形态变得模糊;地表异常响应对厚度反应不灵敏;对水平规模大小变化反应非常灵敏。这些规律将对油气田剩余油分布和注水推进前沿的确定,以及井地电位仪器分辨率的设计提供指导作用,并为井地电位法反演成像奠定相关基础。To study the influence rules of the surface abnormal response on the variable physical parameters by borehole-ground DC method,we model the abnormal response with the finite element method.The results showed the distribution of the anomalies is clear when the anomalous body lies in the shallow position,and the distribution of the anomalies became unclear with the depth increasing.The surface abnormal response is insensitive to thickness of the anomalous body,but the response is very sensitive to the lateral dimension.All these rules will give some reference and guide to determine the distribution of the residual oil and the position of the water-injection front and the design of instrumental resolution.At the same time,the results laid the foundations for inversion and imaging of borehole-ground DC method.

关 键 词：井地电法 变物性参数 有限单元法 三维模拟 异常响应 

分 类 号：P631.3[天文地球—地质矿产勘探]