| 1 | The variegated mudstone belongs to the Jurassic Xishanyao Formation and the Toutunhe Formation is generally absent in the Shinan area. | |
| 2 | The Toutunhe sandstone reservoir in Niuquanhu area of Santanghu oilfield is mainly lithic sandstone, with an average porosity of 19. | |
| 3 | In this study, the characters of distributions of ill geological phenomena in the Toutunhe River basin were analyzed, based on the spot investigation and observed data analyzed. | |
| 4 | On the basis of the experience and data obtained by the method in the Toutunhe Reservoir in 2001, and through analysis, an empirical formula was given. |
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