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1 Discovery of secondary freshwater calciteFROM well ZJ-23, around 22 m of condensed limestone has been found in member Chang-3 ofthe Upper Triassic Yanchang Formation. Electric log reflects high resistivity, higher densityof rock and lower values of natural gama, with calcite content of 40%—80%. Observation da-ta of 11 core wafers from 883. 05—887.20 m of the well demonstrate that high-angle struc-tural fracture (2 mm wide) and micro-fracture are relatively developed and fully or half infilled
1 Discovery of secondary freshwater calciteFROM well ZJ-23, around 22 m of condensed limestone has been found in member Chang-3 of the Upper Triassic Yanchang Formation. Electric log indicative high resistivity, higher density of rock and lower values of natural gama, with calcite content of 40% -80%. Observation da-ta of 11 core wafers from 883. 05-887.20 m of the well demonstrates that high-angle struc-tural fracture (2 mm wide) and micro-fracture are relatively developed and fully or half infilled