二连盆地白音查干凹陷下白垩统层序地层研究

在总结钻井、测井、地震等各种资料的基础上,对白音查干凹陷层序地层进行了划分对比,将下白垩统地层划分为3个超层序,6个三级层序。对主要层序内部的岩性特征、沉积相构成、体系域发育状况、地层叠加样式等进行了分析。通过这些特征的研究,对层序的形成背景、沉积演化过程,以及生储盖层的发育条件和组合关系等有了清楚的认识,认为白音查干凹陷演化具有早期形成,继承性发育,晚期鼎盛的特点,凹陷经历三次湖泛,形成三套烃源岩,发育四种成因类型的砂体,存在三套储盖组合。

Sequence Strata of Lower Cretaceous in Baiyinchagan Depression, Erlian Basin

Based on drilling, logging and seismic data, classification correlation of sequence strata has been performed. Formation of lower Cretaceous can be divided into 3 super sequences and 6 tertiary sequences. Lithology, sedimentary facies, system development and formation stacking have also been studied. After these study we could clearly understand the background of sequence formation, deposition evolution, development of source reservoir seal and their association. It is believed that the evolution of Baiyinchagan depression began at its early stage with inherited development and reached its peak at late stage. The depression lasted three flooding, forming three sets of source rocks, which developed 4 types of sandbody with 3 sets of reservoir seal assemblage.