Paleokarstic water tables and their control on reservoirs in Ordovician Yingshan Formation, Tazhong Area, Tarim Basin, NW China
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Paleokarstic water tables and their control on reservoirs in Ordovician Yingshan Formation, Tazhong Area, Tarim Basin, NW China |
| Haizhou QU,Maoyao LIU,Yunfeng ZHANG,Zhenyu WANG,Zhenghong ZHANG,Shiyin LI,Xingliang DENG |
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| Fig. 2. Identification characteristics for different karst zones in Yingshan Formation, Tazhong area. (a), (b) In the epikarst zone of Well G171, dissolved fractures-dissolved caverns filled by grayish green mud and breccia, appearing as mixed dark brown-black streaks, strips and yellow-bright white patches on electric imaging logging; (c), (d), (e) In horizontal underflow zone of Well G9, low-angle unfilled dissolved fractures, and cystic vugs along bedding, appearing as horizontally distributed dark-color streaks (strips) and elongated patches on electric imaging log; (f), (g) In horizontal underflow zone of Well G171, dissolved caverns filled by mud and breccias of various sizes, some breccias characterized by oriented arrangement of major axes, appearing as mixed dark-color, bright-color strips and patches on electric imaging log, with dark-color patches arranging in nearly horizontal direction; (h), (i) In horizontal underflow zone of Well G7, near horizontal dissolved fractures filled by dark-color mud (arrowhead on the right) and light gray breccia (arrowhead on the left), appearing as near horizontal dark-color strips and cystic dark-color patches on electric imaging log. |
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