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塔里木盆地寒武—奥陶系是主要烃源岩发育层段,其中发育有多套多种类型的烃源岩。东部深水陆棚—盆地相区寒武—下中奥陶统发育有泥质烃源岩和泥质碳酸盐岩烃源岩;西部台地相区,下中寒武统发育有局限台地—蒸发台地相碳酸盐岩烃源岩,上奥陶统台地边缘相带发育有碳酸盐岩灰泥丘烃源岩,而在下斜坡相带发育有瘤状灰岩烃源岩。通过将这些烃源岩置于寒武—奥陶系层序地层格架中,发现其发育受海平面变化和层序格架所控制。东部泥质烃源岩属不同级别层序的密集段沉积,西部碳酸盐岩烃源岩属高位体系域沉积。正确认识烃源岩在层序地层格架中的分布,将有助于我们利用层序地层学的理论和方法评价和预测有效烃源岩的分布。
The Cambrian-Ordovician system in the Tarim Basin is a major source rock development zone, in which multiple sets of various types of source rocks are developed. In the eastern deep shelf-basin Cambrian-Lower Ordovician, there are muddy source rocks and muddy carbonate source rocks. In the western Taiwan terraces and the Lower-Middle Cambrian development, there is a limited platform-evaporation There are carbonate rock source rocks in the platform facies carbonate source rock and the Upper Ordovician platform margin facies, while source rock in the lower slope is developed. By placing these source rocks in the Cambrian-Ordovician sequence stratigraphic framework, it was found that their development was controlled by sea level changes and the sequence framework. The eastern mudstone source rocks belong to dense-stage sediments of different grades, and the western carbonate source rocks belong to the highstand system tract. Correctly understanding the distribution of source rocks in the sequence stratigraphic framework will help us evaluate and predict the distribution of effective source rocks using the theory and method of sequence stratigraphy.