塔里木盆地东河砂岩层序特征与分布规律

The Characteristic and Distribution of Donghe Sand-stone Sequences in Tarim Basin.

东河砂岩是塔里木盆地的重要勘探目的层系。通过对其层序的划分对比和空间上纵、横向的分布规律的研究认为,东河砂岩平面分布受控于区域构造背景和古隆坳格局,厚度受控于沉积环境和沉积时的古地貌、古地理,如碳酸盐岩古潜山、背斜谷软弱风化带、单面山软弱风化带等。古隆起的背斜谷和单面山控制了东河砂岩的有利储集相带,古隆起及其围斜部(特别是东河砂岩非构造圈闭发育的有利区)和轮南凸起的围斜部-哈得逊-古城鼻隆西缘,是东河砂岩非构造圈闭勘探的有利区。

The Donghe sandstone is a major target sequence for petroleum prospecting in Tarim basin.This paper shows by classification and correlation of the sequences and study of spatial and vertical distribution of them that its planar distribution is controlled by the regional structural setting and the ancient uplift and depression framework,its thickness controlled by the depositional environment and paleoground feature,paleogeography like carbonate pale-oburied hill,anticlinal canyon softened weathering zone and single hill softened weathering belt.It is the anticlinal canyon and single hill in ancient uplift that control the favorable reservoir and sedimentary facies in Donghe sandstone and the favorable areas in paleo-uplift and its surrounding dip part,especially areas developing non-structural trap in it,including the dip part in Lunan salient-Hadeson-the western margin of Gucheng nose uplift.