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根据野外露头、盆地内钻井、测井和地震资料,可以将塔里木盆地石炭系划分成四个层序。东河砂岩形成于石炭系下部层序Ⅰ海侵体系域中。该海侵体系域由三个以加积式堆砌样式为特征的准层序组构成,是在海平面不断上升和盆地可容空间不断增大的情况下,沉积物不断超覆在具一定古地形差异的隆起缓坡之上形成的。受物源区性质和波浪作用共同影响,东河砂岩多表现出岩屑质石英砂岩的特征,其成分和结构成熟度较高,储集物性好。因其分布稳定而厂泛,与烃源岩和盖层又具有良好的配置关系,从而构成了塔里木盆地重要的优质海相碎屑岩油气产昙。
Based on outcrops in the field, drilling, logging and seismic data in the basin, the Carboniferous in the Tarim Basin can be divided into four sequences. Donghe sandstones formed in the lower part of sequence Ⅰ transgressive system tract of the Carboniferous. The transgressive system tract consists of three quasi-sequence groups characterized by accreting pile-up pattern. Under the circumstance that the sea level keeps rising and the permissible space of the basin increases continuously, Topographical differences formed on the gentle uplifts. Affected by the nature of source rocks and waves, Donghe sandstone more often exhibits the characteristics of lithic quartzite sandstone with higher composition and structure maturity and good reservoir properties. Because of its stable distribution and plant pan, and the source rock and cap layer also has a good relationship between the configuration, which constitutes the Tarim Basin, an important high-quality marine clastic hydrocarbon production Tan.