满加尔凹陷西部地区不整合分布与构造运动

UNCONFORMITY DISTRIBUTION AND TECTONIC MOVEMENT IN THE WESTERN AREA OF THE MANJIAER DEPRESSION

赵靖舟 庞雯

ZHAO Jing-zhou PENG Wen

西安石油学院, 陕西西安 710065

Xi'an Petroleum College, Xi'an, Shaanxi 710065, China

根据钻井、地震和地面露头等资料在满西地区沉积盖层中确认出S底、C底、C1b底、T底、J底和K底6个主要不整合面,并讨论了这些不整合面所代表的构造运动特征及其对满西地区构造面貌和沉积作用的影响。认为早海西运动在满西地区乃至整个塔里木盆地有两幕,形成了2个重要不整合,一幕是发生在泥盆纪末的早海西Ⅰ幕运动,形成C底不整合;另一幕是东河砂岩沉积结束后所发生的早海西Ⅱ幕运动,形成C1b底不整合。同时认为J底不整合所代表的印支运动对满西地区构造面貌发生了重要影响,它结束了轮南古隆起自早古生代以来的长期发育历史,并可能形成哈得逊隆起的雏形。

Based on drilling,seismic and surface outcrop data,S-bottom,C-bottom,C1 b-bottom,T-bottom,J-bottom and K-bottom six major planes of unconformity are recognized in the sedimentary cover of West Manjiaer area.The characteristics of tectonic movement represented by these planes of unconformity and their effects on the tectonic features and sedimentation of West Manjiaer area are discussed.It is considered that there are two episodes of the Early Hercynian movement in West Manjiaer area even in the whole Tarim Basin which formed two major unconformities.One is the Early Hercynian movement of Ⅰ episode which happened at the end of the Devonian and formed the unconformity of C-bottom.The other is the Early Hercynian movement of Ⅱ episode which happeded after Donghe sandstone sedimentation and formed the unconformity of C1 b-bottom.It is also considered that the Indosinian movement represented by J bottom unconformity has important influence on the tectonic features of West Manjiaer area.It terminated the long term developing history of the Lunnan Paleouplift since the Early Paleozoic,and made it possible to form the embryonic Hadexun Uplift.

“九五”国家重点科技攻关项目(99-111-03-01).

https://doi.org/10.11781/sysydz200102149