摘要
根据岩心和薄片分析,采用邓哈姆岩相分类方法,划分良里塔格组岩相和沉积微相类型;采用自然伽马、Th/K曲线和成像测井对比方法,确定沉积相类型;结合地震相研究刻画层序格架下的沉积相展布,编制玉北及邻区的岩相古地理和沉积模式。结果表明:塔里木盆地玉北地区发育9种岩相类型和7种沉积相,沉积相包括潟湖、滩间海、台内滩、缓坡型台缘滩、台缘缓斜坡、生物丘、陆棚相等。由于加里东中期主要为南北向挤压,玉北地区东部的北东向断裂非构造主要应力方向上逆冲幅度较小,形成0.1°~0.5°的缓倾斜坡,分隔台缘斜坡和陆棚。玉北地区台地边缘相带受控于古地貌和海平面的变化,不同时期不断发生侧向迁移,属于缓坡型台地边缘;中央隆起带巴楚东段的台缘相带主要受控于边界断裂,呈垂向加积特征,属于镶边台地边缘。在层序结构、沉积相和沉积模式等方面,缓坡型台缘的碳酸盐岩台地相比碳酸盐岩镶边型台地有一定的差异,缓坡型台地边缘主要发育颗粒滩相沉积,并且随海平面变化,台缘相带有较明显的迁移现象。该结果可为研究区的油气勘探提供参考。
By analyses of core and thin section,we subdivided rock composition and sedimentary micro-faces of Lianglitage Formation by Dunham's lithofacies classification.The sedimentary facies are determined by contrast of GR curves,Th/K curves and imaging logging,the lithofacies paleogeographic map and sedimentary models are mapped under the sequence frameworks.There are nine kinds of lithofacies and seven facies in Yubei Area,including lagoon,beach interact sea,intra-platform banks,marginal bank,platform-margin slope,bafflestone in slope,shelf facies and so on.In Mid-Caledonian,the north-south compression is prevalent while the north-east fracture is not the main tectonic stress in the eastern of Yubei Area.As a result,the thrust magnitude is micro,and there is a gentle slope between 0.1°and 0.5°developed between outer slope and shelf.The marginal bank controlled by the sea level and the paleogeomorphy is migrating crossrange,which is a ramp with a gentle marginal bank.But in the Eastern Bachu Lift of central lift,the maginal reef-bank is vertical aggradation controlled by the boundary fault.A ramp with a gentle marginal bank is obviously different from carbonate rimmed platform in the sequence structure and sedimentary facies and sedimentary model,a ramp with a gentle marginal bank has mainly grain beaches and the marginal banks migrated with the change of sea level.
作者
姜海健
杨鑫
储呈林
陈强路
乔桂林
JIANG Haijian;YANG Xin;CHU Chenglin;CHEN Qianglu;QIAO Guilin(Institute of Petroleum Geology,Research Institute of Petroleum Exploration and Production,SINOPEC,Wuxi,Jiangsu 214122,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)
出处
《东北石油大学学报》
CAS
北大核心
2020年第6期21-32,I0002,共13页
Journal of Northeast Petroleum University
基金
中国石油化工股份有限公司科技部项目(P10023)
中国石油化工股份有限公司西北石油局项目(KY-2013-S-039)。
关键词
塔里木盆地
玉北地区
良里塔格组
沉积相
层序地层
岩相古地理
沉积模式
Tarim Basin
Yubei Area
Lianglitage Formation
sedimentary facies
sequence stratigraphy
lithofacies paleogeography
sedimentary model
