A Numerical Study of Currents in the Taiwan Strait During Winter

Between 1992 and 1997,under a project conducted by the Water ResourcesBureau,more than 200 well loggings were measured by TaiwanSugar Corporation Groundwater Center(TSCGC)in the Choshui andPingtung areas.The purpose of this paper is to evaluate the workability ofthe log trend method in this hydrogeology investigation project.Previousstudies used the Schlumberger formula to calculate the mud content andhad a 40% error rate.The reason for this high bias is that mineral assemblage,casing,caves and borehole diameter variations shift the naturalgamma readings.In the author's experience,borehole diameter variationis the major factor.The gradual shifting greatly reduces the exactness ofthe Schlumberger formula but isn't a serious problem when using the curvetype method.In this research gamma logs in three boreholes of the Choshuifan-delta,Taiwan,are classified to basic log trend facies and comparedwith the core samples.This study finds eight basic gamma log trend facies and these faciescorrespond very closely to the mud content or mud thickness.This researchsuggests that gamma log trends facies are useful to lithology interpretationof TSCGC's data and are valuable for further research into sedimentaryenvironment reconstruction and aquifer geometry prediction.

並列關鍵字

Taiwan Strait ； Oceanic Front ； Numerical Model

國際替代計量

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