裂隙岩層的水流流通面積對跨孔雙封塞微水試驗資料分析之影響
摘要
裂隙岩層中裂隙分布不均勻且裂隙連通不完整，因此利用碎形幾何模式來分析水力試驗資料，碎形幾何模式特徵是水流維度n為介於1到3 之間的任何實數。在鑿井與設置的過程中，井周邊的地質材料遭破壞而改變其性質，使原本含水層滲透性改變，這個現象稱為薄壁效應。因為裂隙分布與薄壁效應的影響使含水層與水井之間水流流通面積會有所不同，造成碎形幾何模式分析高滲透微水試驗資料時，測試井與觀測井在不同的水流流通面積下會推估出一組對應的K和Ss值，因而產生非唯一解。本研究是在新竹尖石裂隙井場進行跨孔雙封塞微水試驗獲得振盪反應資料，微水試驗資料呈振盪反應表示裂隙具高滲透性可連通測試井與鄰近觀測井。利用本模式來分析測試井與觀測井的振盪水位變化，探討水流維度與薄壁效應對微水試驗推估水力傳導係數的影響。現地微水試驗資料分析的結果顯示，同一筆資料中不同n值所推估出的K值相差不超過一個數量級，井場整體裂隙推估出來
的K值範圍介於4×〖10〗^(-4)與6×〖10〗^(-3)之間。

Effect of Flow Area on Data Analysis of Cross-borehole Double Slug Test in Fractured Formation
Abstract
Fractured is distribution and connectivity of discontinuity in fractured formation. Analysis the hydraulic test data by fractal geometry model with the characterized is the flow dimension n can be any non-integral number between 1 and 3. Setting the drilling process, the well surrounding of the geological media is destroyed, so that the original aquifer permeability changes, this phenomenon is called skin effect.
The flow area is impact on n and skin effect, test wells and observation wells at different flow area will be a set of corresponding estimate K and Ss values, resulting in a non-unique solution.The oscillatory response of cross-borehole double-packer slug tests in the fractured formation in Jianshi county. Slug test data showed oscillating response is a high permeability between test wells and observation wells. Using the model to analysis the water level changes in test wells and observation wells, explore the effect of flow dimension and skin effect in slug test to estimate hydraulic conductivity. Analysis test wells and observation wells at different flow area will be estimate of a corresponding set of K and Ss values in high penetration response. The error of K values is one order of slug test in the same data, and the wells field fractured of K values ranging from 4×〖10〗^(-4)with 6×〖10〗^(-3) between.

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