Sporopollen Assemblage and Geological Significance of 3 538~3 774 m Section in Well Chetan 1, Chepaizi Oilfield, Xinjiang
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摘要: 车排子油田钻遇地层时代依据不足，地层划分与对比认识多有分歧。如前人在车探1井等井中所划分的莫老坝组无年代学依据。车探1井中同时出现莫老坝组和包古图组2个分属不同小区的地层，使车排子油田与盆北缘包古图小区地层系统对比混乱。笔者于车探1井3 538~3 774 m井段原划莫老坝组的岩心取孢粉样品分析，样品中裸子植物花粉含量为53.50%，蕨类植物孢子含量为46.50%，主要孢粉组合为Cyathidites minor-Osmundacidites-Deltoidospora-Pinuspollenites-Disacciatrileti-Cycadopites，时代为中侏罗世。结合岩石组合、孢粉时代及区域对比，将原定“上石炭统莫老坝组”重新厘定为中侏罗统西山窑组。取消“莫老坝组”一名后，车排子油田全部地层序列与包古图地层小区具有可比性。Abstract: In Chepaizi oilfield, the stratigraphic age is insufficient, while the views of stratigraphic division and correlation have divergence, for example, the Molaoba formation in well Chetan 1, divided by predecessors, has no Stratigraphic-Time basis. Molaoba formation and Baogutu formation, which belong to different areas, occur simultaneously in well Chetan 1, resulting in the stratigraphic system correlation between the whole oilfield and Baogutu area become very confusion. Sporopollen samples were taken from the cores of the 3 538~3 774 m well section of well Chetan 1 that divided as Molaoba formation for analysis. The results show that content of gymnosperm pollen and fern spore in the samples is 53.50% and 46.50%, respectively The main sporopollen assemblage is Cyathidites minor-Osmundacidites-Deltoidospora-Pinuspollenites-Disacciatrileti-Cycadopites, suggesting that the age of the formation is Middle Jurassic. Combined with rock assemblage, sporopollen age and regional correlation, the original "Molaoba formation of Late Carboniferous" should be redefined as Xishanyao formation of Middle Jurassic. After canceling the name of "Molaoba formation", all stratigraphic sequences of Chepaizi oilfield are similar to Baogutu stratigraphic area.
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Key words:
- Chepaizi oilfield /
- Well Chetan 1 /
- sporopollen fossils /
- Xishanyao formation /
- Molaoba formation
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