鄂尔多斯盆地吴旗油区下侏罗统古地貌特征与油气富集关系

沉积时期的古地形地貌是控制沉积相发育与分布的一个重要因素,并且在一定程度上控制着后期油气圈闭的类型与分布。通过补偿印模法恢复吴旗油区前侏罗纪古地貌形态,确定局部构造特征,开展有利储集相带预测。该区油藏分布主要受控于古地貌形态,深切延长组的古河谷是油气运移的主要通道,古地形高部位成为油气运移的主要指向,古河谷附近的砂体成为油气富集的有利场所,上覆的沼泽相泥岩形成了良好的岩性遮挡条件。

Lower Jurassic paleogeomorphology characteristics and relationship between oil and gas accumulation in Wuqi oil area of Ordos Basin

Geomorphology is one of the most important factors to control development and distribution of sedimentary facies, and to a certain extent, it controls the type and distribution of late oil and gas traps. This paper restores the Early Jurassic geomorphohgy features of Wuqi oil area, determines the local structure and predicts the favorable reservoir facies through tile compensation impression method. The reservoir distribution is mainly controlled by paleogeomorphology form. The ancient valley which cuts up Yanchang Formation is the main channel of oil-gas migration. The high position of palaeotopography becomes the ,nain point of oil- gas migration. The sand body near ancient valley becomes oil and gas enrichment place and the overlying marsh facies mudstone becomes good lithology trap conditions.