Fig.8-10 Time derivatives of pressure changes during packer tests of fractures in the Wakkanai Formation (from 32 points in 10 boreholes)
Stable or decreasing derivatives during the middle to late period of the elapsed time indicates a high fracture connectivity, whereas, an increasing derivative suggests low connectivity. The former and latter derivatives characterize the (a) shallow and (b) deep domains of the Wakkanai Formation, respectively.
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