直流高密度电法在浅海工程勘察中的应用

摘要

用于海域工程勘察的物探方法相对较少，地震反射波法是水域工程物探的首选方法，但当遇到海底沉积层中含浅层气时，声波信号受屏蔽导致地震探测失效；因此尝试采用直流高密度电法探测浅海工程海底沉积层厚度和基岩面起伏情况。结合电阻率测井资料建立模型并进行正反演计算分析，并通过广东汕头市苏埃通道工程实例证实直流高密度电法可以获得较为理想的探测效果。在局部地震反射波法有效的区段进行两种物探方法的综合解释，可以提高解释的可靠性及解释的精度。%Fewergeophysicalmethodscanbeutilizedinmarineprojectexplorationthanintheland.Seismicreflectionisthepreferred geophysicalchoice.Whenthesubmarinesedimentsarecontaminatedbyshallowgas,theshieldingeffectofacousticsignalleadstothe failureofseismicdetection.Inthispaper,thehighdensityDCresistivitymethodwasadoptedtoinvestigatethesubmarinesedimentary strataaswellastheunderlyingbedrock.Theforwardandinversemodelwasbuiltandcalculatedbasedontheresistivityboreholelog-gingdata,ashallowonshoreengineeringwiththismethodwasconductedandtheresultsshowsatisfactoryresultsinthesubmarineengi-neeringexploration.Insomepartsoftheareawhereseismicreflectionworkseffectively,theauthorsexplainedthegeologywithcompre-hensivemethods,whichcouldensurethereliabilityandimprovetheaccuracyoftheinterpretation.