| 1 | Oil shale always has the accompanying relationship with overlying sedimentary tuff or other tuffaceous strata. | |
| 2 | The formation of Xing Anling groups in Suderte oil field is volcano chipping rock which is mainly contained of tuff layer and deep tuff layer. | |
| 3 | These volcanic event deposits are wide spread in the region and consist mainly of tuffs, tuffites and tuffaceous sedimentary rocks. There is some regularity in their temporal-spatial distribution. | |
| 4 | Bao ancient group plans for a major deep-sea - a half deep in the ash, black ash-like TLC tuffaceous siltstone, shale tuffaceous, with gray green, with thin gray-tuff interbedded uneven. | |
| 5 | There is a layer of tuffite reservoir in Erlian oilfield. The log responses of this tuffite reservoir are different from those of normal sedimentary rock and pyroclastic rock. |
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