湖盆重力流沉积特征及模式:以鄂尔多斯盆地及滦平盆地为例

发布时间：2018-06-03 17:22

本文选题：湖盆 + 重力流　；参考：《地质科技情报》2017年05期

【摘要】：湖盆中心重力流砂体已经成为我国陆相盆地勘探的重要目标。通过对鄂尔多斯盆地浅水坳陷型湖盆以及滦平盆地早白垩世断陷型湖盆内部的重力流沉积体的研究,取得了以下2点主要认识:(1)鄂尔多斯盆地上三叠统延长组的重力流发育受到湖盆强烈坳陷作用以及湖平面下降2方面因素控制,重力流分布以大规模平铺-毯式为主,没有明显的沟道沉积,岩性偏细,流体性质以牵引流为主;(2)滦平盆地下白垩统西瓜组重力流发育受到控盆断层活动控制,碎屑物质迅速入湖,冲刷侵蚀作用明显,结构及成分成熟度低,流体性质主要为碎屑流。在2点认识基础之上总结了坳陷型湖盆以及断陷型湖盆两类盆地3类重力流沉积模式,丰富了陆相湖盆重力流理论体系。
[Abstract]:Gravity flow sand body in the center of lake basin has become an important target of continental basin exploration in China. The gravity flow sedimentary bodies in the shallow water depression type lake basin of Ordos basin and the early Cretaceous fault type lake basin in Luanping basin are studied. It has been obtained that the gravity flow development of the Upper Triassic Yanchang formation in the Ordos Basin is controlled by two factors, namely, the strong depression of the lake basin and the descent of the lake plane. There is no obvious channel deposition, the lithology is thin, and the fluid property is mainly traction current.) the development of gravity flow in the watermelon formation of Lower Cretaceous in Luanping Basin is controlled by the fault movement of the controlling basin, the clastic material rapidly enters the lake, and the erosion and erosion effect is obvious. The structure and composition maturity is low, and the fluid properties are mainly clastic flow. Three types of gravity flow sedimentary models of two types of basins, depression type and faulted lake basin, are summarized on the basis of two understanding points, which enriches the theoretical system of gravity flow in continental lacustrine basin.
【作者单位】：中国石油勘探开发研究院;中国地质大学(北京)地球科学与资源学院;中国石油西南油气田分公司;
【基金】：国家油气专项(2011ZX05005-004-HZ06;2011ZX05009-002)
【分类号】：P618.13

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